diff --git a/docs/CONSUMER-SETUP.md b/docs/CONSUMER-SETUP.md new file mode 100644 index 00000000..93169860 --- /dev/null +++ b/docs/CONSUMER-SETUP.md @@ -0,0 +1,69 @@ +# Consumer setup — the protection set, nothing else + +For running this fork purely as protection: no captures, no telemetry, no +development machinery. Install and launch mechanics are upstream's — follow +the main [README](../README.md) ("Quick Start", "Running as a service"); +this page only tells you **which switches to turn on and why**. + +## What it protects against + +Claude Code re-sends the whole conversation every request; Anthropic bills +the unchanged part cheaply only while the bytes match exactly. Three CC +behaviors break that match and silently re-bill six-figure token counts: + +1. **Old reminder blocks get re-shaped mid-history** + ([anthropics/claude-code#76606](https://github.com/anthropics/claude-code/issues/76606), + [#78660](https://github.com/anthropics/claude-code/issues/78660)) — an + edit deep in the history re-bills everything after it. +2. **The tools list changes when a tool loads mid-session** + ([#81967](https://github.com/anthropics/claude-code/issues/81967)) — the + tools list heads the cached prefix, so one late tool load re-bills the + entire context. +3. **Byte drift in already-sent messages** (stray whitespace, block + re-serialization — + [#48734](https://github.com/anthropics/claude-code/issues/48734)) — any + 2-byte wobble invalidates the whole prefix. + +The extensions below hold the forwarded bytes stable across all three, and +a last-line guard makes sure no mitigation can ever corrupt a conversation: +on any structural mismatch it forwards the original untouched. + +## The switches + +Bake these into the service at install time (see the README's +`install-service` section — flags set at install time land in the unit): + +```sh +CACHE_FIX_FORWARD_PROXY=on \ +CACHE_FIX_INSERTION_NORMALIZE=1 \ +CACHE_FIX_VOLATILE_PIN=1 \ +CACHE_FIX_TOOL_REWRITE=1 \ +CACHE_FIX_OUTPUT_GUARD=1 \ +cache-fix-proxy install-service +``` + +| switch | what it does | +|---|---| +| `FORWARD_PROXY=on` | transport mode — Claude Code connects through the proxy with no `ANTHROPIC_BASE_URL` change | +| `INSERTION_NORMALIZE=1` | recognizes messages by content, so relocated/re-shaped history is forwarded in its first-seen form | +| `VOLATILE_PIN=1` | pins reminder blocks to their first serialization — CC's re-stamps stop reaching the wire | +| `TOOL_REWRITE=1` | freezes the tools list; late-loaded tools are announced at the tail instead of re-writing the prefix (auto-limited to models measured to support it — everywhere else it degrades to stock behavior, never an error) | +| `OUTPUT_GUARD=1` | the safety net: validates structure after all mitigations and restores the original on any violation | + +Everything upstream ships enabled by default stays enabled — those handle +further stabilization (fingerprint stripping, sort stabilization, etc.). + +**Deliberately NOT enabled** (development/telemetry, not protection): +`REQUEST_CAPTURE`, `SESSION_MIRROR`, `PREFIXDIFF`, `UPSTREAM_DETECTION` — +these record traffic for the verification machinery. A consumer needs none +of them; leaving them off means nothing about your conversations is written +to disk beyond what Claude Code itself stores. + +## How you'd notice it working + +The mitigation is invisible by design — the observable is your usage: +long sessions stop hitting sudden six-figure `cache_creation` spikes on +turns where nothing big changed. If you suspect a problem, the guard's +restore events land in +`~/.claude/cache-fix-snapshots/guard-events.jsonl`; an empty or absent +file is the normal state. diff --git a/docs/dev-loop.md b/docs/dev-loop.md new file mode 100644 index 00000000..0e7cb652 --- /dev/null +++ b/docs/dev-loop.md @@ -0,0 +1,476 @@ +# Dev loop: working on this proxy without shipping cache busts + +Read this before changing anything under `proxy/`. It is the procedure that +found six self-inflicted defects in one day (2026-07-28) after months in which +every one of them was live and invisible. + +## The four commands + +```sh +node tools/replay.mjs --census # what shapes are in this traffic +node tools/replay.mjs [--env …] # the GATE — must exit 0 +node tools/gate-live.mjs # the gate over EVERY live capture +node tools/harvest.mjs # promote novel pairs to fixtures +npm test # committed fixtures, deterministic +``` + +`npm test` is necessary and not sufficient — see "the corpus is blind along +its own curation axis" below. `gate-live` is the one that runs against +production-shaped input. + +Captures live in `~/.claude/cache-fix-captures/` (written by the +`request-capture` extension, `CACHE_FIX_REQUEST_CAPTURE=1`). + +## The gate + +`tools/replay.mjs` runs the real pipeline over recorded traffic and enforces +four invariants. It exits non-zero on any of them, so it is a gate, not a +report. + +| check | question | failure means | +|---|---|---| +| **stability** | did our output diverge EARLIER than CC's input? | we made a bust bigger than CC's bug required | +| **safety** | same message count, roles, order, tool adjacency? | we corrupted the conversation | +| **sequence** | does a normalize get followed by a reset? | a mitigation that works once and bleeds after | +| **canonical order** | do canonical entries map to increasing wire indices? | our state model has drifted from the wire | + +Safety outranks the rest: cache costs money, a mangled history costs +correctness. + +`--census` classifies structural deltas; `--trace` shows per-conversation +extension state. `--trace` is a **diagnostic, not a gate** — it has never gone +red on a defect it was built for, so it carries no authority. + +## Standing rules + +**Captures are PRE-pipeline** (`request-capture` runs at order 60, ahead of +every mutating extension). So: a divergence present in the raw capture is +Claude Code's; one absent there is OURS. That single fact is what makes +attribution possible instead of speculative — use it before blaming either +side. + +**Group by conversation before comparing anything.** One session-id header +carries the main thread, every subagent, and CC's own sidecar calls. Comparing +across them makes tenant switches look like churn. This artifact produced +false results six separate times in one day, including in the gate itself — +adjacent-line pairing reported 0 violations on a 602-request capture while a +40-request single-conversation slice of the same session reported 2. + +**A green gate is required; token numbers are advisory.** The goal is zero +preventable busts. `tools/cache-sim.mjs` prices what the gates let through, +and its absolute totals are not trustworthy (see its header) — use it for A/B +deltas on one corpus, never as a verdict. + +**Run `npm test` alone.** The suite shells out to `git`, so a concurrent +commit in the same repo makes it block on `index.lock` — once observed as a +600-second hang that looked like a hung test. + +## Replay the configuration that is SERVING, not the defaults + +`replay.mjs` inherits nothing from the systemd unit. Extension gates are read +from `process.env`, and several default OFF while production sets them ON — +`CACHE_FIX_TOOL_REWRITE` is the one that bit. On 2026-07-28 every gate run +that day exercised a pipeline nobody runs: + + default gates: 0 stability violations + production gates: 2 stability violations, both deferred-tool-rewrite + +Same corpus, same code, same day. A green verdict over the wrong +configuration is worth nothing, and it is worse than no verdict because it +reads like one. + +`tools/gate-live.mjs` now resolves the gate set from the running unit and +prints it, so every sweep is self-describing. Three answers to "which gates" +must agree, and `doctor` compares all three: + + DECLARED Environment= in cache-fix-proxy.service + RUNNING /health `gates` — what the process actually started with + VERIFIED `gates` in cache-fix-gate-status.json — what the sweep replayed + +DECLARED ≠ RUNNING means the unit was edited without a restart. VERIFIED ≠ +RUNNING means the sweep's verdict does not apply to production. Either way +the other two answers become meaningless, so both are FAIL. + +Running a one-off replay by hand? Pass the gates, or you are testing fiction: + +```sh +node tools/gate-live.mjs # resolves them for you — prefer this +``` + +## Rule out the instrument before reporting a defect + +When a check goes red, there are always two hypotheses: the SYSTEM is broken, +or the CHECK is. Report the first without excluding the second and you file a +phantom — and on 2026-07-28 five of six things that looked like Claude Code's +bug were ours, while the safety gate's first 243 "corruptions" were its own +missing exemption. The instrument is not a neutral observer; it is the newest +and least-tested thing in the room. + +Order that works, cheapest first: + +1. **Is the pair what you think it is?** Violations are reported per + CONVERSATION, so the predecessor is usually not the previous capture line. + Diff `prevN` against `n` — never `n-1` against `n`. (This cost a wrong + diagnosis: the pair was 44→47, the probe compared 46→47, and the two + unrelated subagent requests it diffed looked like total corruption. The + violation line now prints `prevN->n` for that reason.) +2. **Is the checker's own exemption list current?** A DECLARED behaviour — + `deferred-tool-rewrite`'s `tool_addition` announcement is the standing + example — is not a defect, and a check that forbids it trains its reader + to ignore red. +3. **Read the attribution the gate already prints.** Every stability + violation now carries `[CC bytes at outDiv IDENTICAL -> ours]` or + `[CC also changed outDiv]`. The first means the divergence is ours by + construction — nothing upstream changed at that index — and needs no + probe. This line exists because the same comparison was hand-derived by + throwaway script three times in one day; the throwaway probe is the tell + that a check is missing. +4. **Only then look at the bytes.** Print the diverging index from both + sides and read what is actually there. + +Whenever a step of this list gets answered by hand twice, that is the signal +to move it into the tool. Steps 1 and 3 both started as manual probes. + +A finding survives this and it is real: at index 4, request 44 carried an +injected `tool_addition` block that request 47 did not. That is a genuine +self-inflicted bust, and it was worth being sure before saying so. + +## "Streams" is a claim about a mechanism, not an API choice + +The capture read was fixed for scale twice and was still O(file) the third +time. `readFile` → RangeError (found 2026-07-28); per-entry retention → +compactEntry (same day, "the wall had only moved"); and then readline's async +iterator, which reads push-based and buffers every line the consumer has not +taken yet. The replay awaits per request, so during each await the queue grew +— measured 2026-07-29: 1.2 GB held after 25 consumed lines, the entire +remaining file (~2.3 GB as strings) by line 75, a 3.27 GB peak wearing a +comment that said "streamed, never slurped". + +Three things worth keeping from the episode: + +- **Verify the mechanism, not the API shape.** "We use a stream now" was true + and irrelevant — reading happened at disk speed regardless of consumption. + The content question is `bytesRead` against bytes consumed, and it is + cheap: the read-lines bite test asks exactly that and went red on line 3 + against the readline shape. +- **A probe must reproduce the consumer's YIELD behaviour, not just its + cost.** The first probe simulated per-line work with a synchronous + busy-wait: the event loop never turned, the stream could not run ahead, and + the probe reported the defect absent. Swapping the busy-wait for + `await sleep(40)` — same delay, one yield — showed 2.3 GB. A slow consumer + and an *awaiting* consumer are different programs to a push-based source. +- **A recurring failure class earns a resource cap as its standing check.** + After the third wall, the fix stopped being only code: gate-live now runs + every replay child under `--max-old-space-size=2048`. A replay that truly + streams needs ~15% of capture bytes; one that regressed into retaining its + input dies against the cap and fails the sweep the same day, whatever the + fourth wall turns out to be made of. + +## The census names the class; only content names the cause + +Row 4 sat "re-opened" for a day with the mechanism unexplained — while an +outside reporter with far lighter tooling (#78660) had already named it. The +gap was not effort; it was a structural blindness we designed in: the census +reduces messages to hashes and ordinals, which is what makes it scalable and +publishable, and exactly what makes it causally mute. Hashes can say +same/different/moved; they cannot say "this is the task-tools nudge, and it +anchors to the last human message." Two rules from the miss: + +- **When a class is localized, return to the bytes and to the STRUCTURE.** + Read the actual content at the offending position (once, locally — the + privacy discipline applies to what gets committed, not to what gets read), + and relate the position to conversation structure: roles, anchors, + injection zones. The verdict that closed row 4 was one 30-line matcher + relating edit positions to the last human-typed message (20 of 22 within + ±2). That relation now lives in the census itself (`anchorDelta` on every + edit row, with a "far from any anchor = new mechanism" callout) — the + matcher was the prototype, per the standing rule about throwaway probes. +- **Sweep the public tracker when an investigation OPENS, not after it + ships.** The row-4 mechanism sat in a public issue for over two weeks + while we derived the same facts independently. One `gh search issues` per + new unexplained class converts an investigation into a verification — + strictly cheaper, and the verification is worth posting back. + +## Never hand-roll identity in a probe + +Twice on 2026-07-28 a throwaway probe reached a wrong conclusion because it +computed its own notion of "the same message" instead of importing the one the +code uses: + +- a probe hand-built a session key, found a collision that did not exist, and + reported a bug against production code; +- a probe compared message SETS to decide whether a pair was a tail append. It + was a mid-history edit at index 768. The probe had printed the positional + divergence in the same output and it was read past — set membership says + "these entries all still exist", which is not the question a cache asks. + +A third on 2026-07-31, in a NEW tool rather than a throwaway probe: a census +of the row-4 container migration paired requests by `sid`, then by its own +first-message hash, instead of importing `conversationOf`. It reported 475 +rule failures — 99.3% — and every row read `actual=0ch`, the tell that no +counterpart was found AT ALL rather than a rule that failed. Two distinct +errors rode in on the hand-rolled identity: comparing `before[i]` to +`after[i]` by INDEX (one inserted message shifts every later index), and +pairing ADJACENT capture lines (live traffic interleaves main, subagent and +sidecar, so two requests of one conversation sit several lines apart — the +trap `replay.mjs` already documents at its grouping comment). Corrected +grouping turned 475 failures into 0. Both wrong answers looked like findings +and would have blocked a correct mitigation. + +Both are the same mistake as the collisions in the extensions themselves: an +identity computed more cheaply than the thing it identifies. Import +`semanticIds`, `identityKey`, `firstDivergence`, `censusPair`, +`conversationOf` — never re-derive them inline. Two corollaries the third +instance forced: + +- **Extend an existing tool before writing a new one.** If a tool in the + domain already exists, the default is to add the mode there; a new file + needs a stated reason the existing one did not fit. This is not tidiness — + reuse INHERITS hard-won correctness (the interleaving lesson, the pairing + rule, the three-answer discipline), while a fresh file re-earns every one + of them from zero, silently and usually wrongly. +- **Any comparison of two requests is grouped by CONVERSATION, never by + capture adjacency and never by index.** `conversationOf` is exported from + `replay.mjs` for exactly this; if a tool needs an identity that is not + exported yet, export it rather than restate it. And when a question is about CACHE, the answer is always +POSITIONAL: the API keys on the longest identical PREFIX, so "what changed and +at which index" is the only form that means anything. "Which entries exist" +never is. + +The tools now answer it directly — `--census` prints `edit@N of M` per +replace/edit and `[CC bytes at outDiv IDENTICAL -> ours]` per violation — so +reaching for a probe at all is the signal that something is missing from them. + +## A checker has THREE answers, not two + + verified clean -> pass + verified broken -> fail + COULD NOT VERIFY -> its own answer, folded into neither + +The third is where checkers lie, and it happened three times on 2026-07-28 +alone: + +- `claude-worktime --cold` printed **"No cold rewrites recorded"** while 26 real + records sat in the file — its parser had died on one malformed line and the + error went to `/dev/null`; +- the gate sweep would have reported a run over **zero captures** as success — + it checked nothing and nothing said so; +- the replay-fidelity check printed **"0/0"**, which reads exactly like + "checked and clean" when it means "there was nothing to check". + +Every one of those is an absence of evidence wearing a verdict's clothes, and +each was written by someone who had just fixed the previous one. + +Which of the two an absence maps to is a JUDGEMENT, and it has to be made +deliberately rather than by default: + +- absence that is ITSELF the defect → **fail**. A gate running with no entry in + the acceptance roster means somebody flipped a flag without recording what + proved it safe. +- absence that is nobody's fault → **warn, and say what is missing**. No + comparable requests, no outcome records yet, no captures on this machine. + +What is never allowed is silence, or a number shaped like a pass. If a run +proves nothing, the output says it proves nothing. + +Mechanised on the dotfiles side: `bootstrap/doctor.py` enumerates its own +`*_verdict` functions by introspection and fails its self-check if any lacks a +test, so a new verdict cannot be added without its could-not-verify case being +exercised. + +## The closing gate: four questions before any proxy work is done + +MANDATE (operator, 2026-07-29). Every piece of work here — a fix, an +investigation, a probe, a doc — answers these four before it closes. Each +question has a same-day precedent where skipping it cost real time; "no" +is an acceptable answer, silence is not — and a "no" or "not yet" must +NAME the missing evidence or design element, which converts it into a +spec. An unnamed deferral is drift, and a deferral justified by a cited +rule that collapses under one question was a rationalization, not a +reason (same day: a trend alarm was declined citing red-before-build, +which synthetic bites already satisfied; naming the real concern — +false-fires on deliberate changes — produced the design that dissolved +it, acknowledge-by-commit, within the hour). + +1. **Can this be mechanized?** Interpretation stays human; everything + around it is machinery — the check, the annotation, the alarm, the + EVIDENCE DELIVERY. The tell remains the throwaway probe: row 4's verdict + came from a 30-line matcher that became `anchorDelta` the same day, and + the byte-extraction friction that stalled the row for a day became the + far-from-anchor excerpt pass. If the answer is "it needs judgment", ask + again about the part BELOW the judgment: delivering the inputs to the + judgment is always mechanizable. +2. **Is the evidence harvestable?** Captures rotate on a quadratic clock; + a finding that rests on volatile bytes is a finding with an expiry date. + If the claim would be unverifiable after rotation, snapshot what proves + it — sanitized, via the harvest path — before closing (precedent: the + growth-step spec exists because a baseline step's explaining diff dies + with the capture). +3. **Does the census need a new class or annotation?** A class you named + by hand while investigating is a classification the census should emit + — otherwise the next instance gets re-derived instead of recognized + (precedent: `anchorDelta`, occurrence ordinals, the tools-delta kinds + all started as hand-derivations). A NAMED deferral can still answer + the wrong question here: whether the class deserves an ALARM is + question 4's concern — question 3 asks only whether a classification + now exists by hand, and a probe that assigns kinds or counts to + traffic answers it YES by existing. The one valid deferral argues the + derivation is genuinely one-off. (Observed: the resume-boundary + classifier was parked with an alarm-shaped basis minutes after its + probe had hand-classified every capture; one operator question undid + the parking.) +4. **Did the instruments ride along?** A mitigation change without its + replay/gate change ships blind: the gate replays the SERVING config, so + an instrument that lags the extension verifies a pipeline nobody runs + (precedent: the day every gate run exercised defaults while production + ran eleven gates). New state, new record fields, new gates — each lands + with its replay handling, its ledger declaration, and its three-answer + doctor verdict in the same change. + +### Cadence: the gate guards the flow, the sweep re-checks the stock + +The closing gate runs at work-time, per change. A dispatched stock-sweep +(read-only, the four questions over the WHOLE system) is for after building +bursts — the 2026-07-29 sweep found twelve gaps because twelve pieces of +machinery had just landed, and its top finding was live within the hour. +Not a standing schedule: standing machinery must be maintained forever, and +a sweep of an unchanged system yields nothing. Retirement signal, borrowed +from skill-craft's consolidation rule: two consecutive sweeps returning +only minor findings — then the ritual stops until the next burst. + +## Adding a check + +Two rules, both learned the expensive way: + +1. **It must go RED on the real defect before it counts.** Not "would have + caught it" — demonstrated. Two checks built this way did not work, and only + the bite test revealed it: a canonical-size drift signal flagged nothing on + the bug it was designed for, because a split adds one entry AND one message + so the counts stay equal while the ORDER diverges. +2. **Automate the mechanism, not the symptom you remember.** That drift check + was built from a remembered number ("canon 92, live 84") that came from a + *different* bug, already fixed. Re-derive which change produced an + observation before building on it. + + **A bite's expected value comes from the invariant's DEFINITION, never + from the implementation or the reasoning that produced it** — an + expectation with the same parentage as the code pins the bug it should + catch. Write the definitional comment first; the assertion follows from + it. (Observed: the succession bite's first draft asserted a + one-shot-sidecar handback as a correct succession — same mental model + as the code's missing first-appearance condition; writing the + definition sentence is what contradicted the assertion, and the + phantom-minting bug fell out of the correction.) + +3. **The corpus is blind along its own curation axis.** `harvest.mjs` selects + pairs by *structural novelty* and sanitises them, so the committed fixtures + are small by construction — and therefore a fixture corpus curated for + structure can never contain a scale-shaped input. Both gate defects found + on 2026-07-28 lived exactly there: a `RangeError` on a 955 MB capture, and + a 3.2 GB retention peak. `npm test` could not have caught either, and no + amount of care would have changed that. Generalise it before assuming this + is about file size: **whatever property a corpus is curated for, every + other property is where it is blind.** + + That is what `tools/gate-live.mjs` is for — it runs the real gate over the + live captures (daily, via `cache-fix-gate.timer`), because they are the + only production-shaped input that exists. `doctor` reads its verdict from + `~/.claude/cache-fix-gate-status.json`. Run it by hand after any change + that touches how the tools READ or RETAIN a capture; the fixtures will not + tell you. + +Every new gate gets a mutation test in `test/replay-gate-selfcheck.test.mjs`. +A gate that is confidently wrong is worse than no gate: it converts +"unverified" into "verified" and nobody notices. + +Corollary: **a check that fires on a non-defect is also broken.** `gate 1` in +`output-guard.test.mjs` asserted a hardcoded corpus count and therefore +validated nothing from the moment a 9th corpus was added; the safety gate +counted `deferred-tool-rewrite`'s own declared `tool_addition` announcement as +243 corruptions. Both trained their reader to ignore a red suite. + +## Identity is where the bugs live + +Four keying collisions surfaced in one day, all the same shape: + +| where | key that was too cheap | +|---|---| +| `deferred-tool-rewrite` | bare session-id — main thread and sidecars shared one tools baseline | +| `insertion-normalization` | (session-id, system-prompt) — every subagent shares one agent prompt | +| the replay gate | adjacency instead of conversation | +| `cache-sim` | a truncated 200-char prefix of `msgs[0]` | + +**An identity computed more cheaply than the thing it identifies will collide, +and the collision presents as churn rather than as a bug.** Hash the whole +thing. `proxy/extensions/message-hash.mjs` is the shared primitive. + +## Volatile content vs. real change + +CC injects session-scoped content into structures that are otherwise stable, +and does so inconsistently: + +- `` hook blocks inside user messages (absorbed by + `insertion-normalization`'s volatile-block pinning) +- the per-session console URL inside the **Bash tool's description** + (absorbed by `toolFingerprint`'s volatile stripping) + +Both are decoration, not contract. The rule when adding another: exclude it +from IDENTITY and forward the FIRST-SEEN bytes, keep the pattern narrow, and +make sure a genuine change still resets. Never serve a stale schema or a stale +message. + +## Corpus hygiene + +Captures grow **quadratically** (each request re-sends the whole history — +one session reached 555 MB) and the retention cap deletes oldest-first. So the +window between "capture written" and "capture deleted" is the deadline for +harvesting. `cache-fix-harvest.timer` runs twice daily for that reason; +`tools/harvest.mjs` is also safe to run by hand at any time — it is idempotent +via per-capture watermarks. + +Harvested fixtures are sanitized (text replaced by deterministic hash tokens, +structure preserved exactly) and therefore committable. Ledgers are +per-machine (`LEDGER-.json`); novelty is judged against every sibling +ledger, so N machines share one deduplicated corpus with no coordination. + +The gate reads captures **line by line**, so pointing it at a live +multi-hundred-megabyte capture is the intended use, not an abuse. It slurped +them until 2026-07-28, when a 955 MB capture produced `RangeError: Invalid +string length` — the gate was unrunnable on the largest corpus while staying +green on every small one. Run it on the live capture, not only on fixtures: +that is what surfaced this. + +## Compaction is a new conversation, not a drop + +Settled 2026-07-28 by replaying a capture containing a real compaction +(session `58c979ce`), keys computed with the shipped +`resolveInsertionSessionKey`: + + n=778 1548 msgs conversation 0dc13516c44f88c7 + n=780 1548 msgs conversation 0dc13516c44f88c7 <- summarization call + n=786 4 msgs conversation 554180f85a9a1528 <- continuation + n=787 6 msgs conversation 554180f85a9a1528 + +Same session-id, same system-prompt sub-key, **different conversation +sub-key**: conversation identity is derived from the history itself, and +compaction replaces `messages[0]` with the summary. So to every stateful +extension the continuation is a NEW conversation — fresh canonical, no reset. + +That is correct, and there is nothing to mitigate. The prefix changed at +index 0, so no cached bytes survive by construction; a compaction bust is +honest. All four gates stayed at 0 across the boundary. + +Two readings this makes easy to get wrong: + +- `insertion-normalization`'s `dropped-majority` branch is **not** the + compaction path and will never see one — it serves in-conversation + shrinkage, where `messages[0]` survives. An earlier version of this file + called that branch an untested gap awaiting a compaction in the corpus; the + corpus now has one and it does not go there. +- `--census` cannot classify a compaction as `drop-only`, because the pair + straddles two conversation groups and is never compared. Absence of + `drop-only` after a compaction is the expected reading, not a miss. + +Both were predicted the other way before the capture was replayed. The +prediction cost nothing because it was checked; stating it as a result would +have put two wrong facts in this file. diff --git a/proxy/extensions.json b/proxy/extensions.json index b28b3684..852b530e 100644 --- a/proxy/extensions.json +++ b/proxy/extensions.json @@ -15,8 +15,10 @@ "workflow-agent-id-synthesis": { "enabled": true, "order": 365 }, "image-retry-circuit-breaker": { "enabled": true, "order": 370 }, "read-dedupe": { "enabled": true, "order": 380 }, + "insertion-normalization": { "enabled": true, "order": 395 }, "cache-control-normalize": { "enabled": true, "order": 400 }, "messages-cache-breakpoint": { "enabled": true, "order": 410 }, + "deferred-tool-rewrite": { "enabled": true, "order": 425 }, "ttl-management": { "enabled": true, "order": 500 }, "cache-telemetry": { "enabled": true, "order": 600 }, "overage-warning": { "enabled": true, "order": 610 }, diff --git a/proxy/extensions/deferred-tool-rewrite.mjs b/proxy/extensions/deferred-tool-rewrite.mjs new file mode 100644 index 00000000..c431e511 --- /dev/null +++ b/proxy/extensions/deferred-tool-rewrite.mjs @@ -0,0 +1,675 @@ +// deferred-tool-rewrite — Phase B (robustness-threat-matrix class 6). +// +// Design: docs/directives/proxy-deferred-tool-rewrite.md, including the +// 2026-07-28 Phase B addendum (documented wire shapes + persistent +// re-injection). Spec contradiction on record: CC docs say deferred-tool +// loads append without disturbing cache; measured 2026-07-27 12:47:56 +// (175k, ledger row tools[SendMessage:added], toolsMatch:false) says +// otherwise on this surface. Until upstream fixes it, the proxy holds +// tools[] byte-stable across a pure tool addition and delivers the newly +// available schema per the DOCUMENTED mid-conversation-tool-changes +// contract (beta mid-conversation-tool-changes-2026-07-01): +// +// - the new tool goes into tools[] with defer_loading: true; +// - the announcement is a {"type": "tool_addition", "tool": +// {"type": "tool_reference", "name": ...}} content block on a +// {"role": "system"} message appended to messages[] — NOT a text +// block on top-level system (Phase A's placeholder; wrong shape AND +// wrong location — top-level system heads the cache prefix, so every +// injection there would bust the whole cache). +// +// STATELESSNESS: the API loads a deferred tool only when its +// tool_addition block is present in THAT request, and CC never echoes +// our injected message back. So both halves re-apply every request: +// tools[] stays held with added tools permanently defer_loading:true, +// and each injected system message is re-spliced byte-identically at a +// content-anchored position (identity hash of the message it was +// injected after). Anchor pruned by context management → re-anchor after +// the latest user message, telemetry `reanchored`, one honest partial +// re-cache. Pipeline order isolates this from insertion-normalization +// (395 < 425): the canonical never sees the injected message. +// +// Detect: compare incoming tools[] against the persisted known set (keyed +// by name). Three things can happen to a known name, and only one is an +// honest content change: +// - present, byte-unchanged (fingerprint match) → carried forward using +// the FROZEN persisted object (not the incoming one), so its wire +// bytes stay stable turn over turn even if the incoming array's key +// order or position drifted; +// - ABSENT from incoming (harness GC'd a loaded deferred tool, e.g. a +// skills/tool-list update) → HELD: re-inserted at its first-seen +// position using the frozen object, exactly as if it were still +// present. Inert once held; costs ~0 (threat-matrix row 13). This +// also fixes pure reorder diffs (e.g. DeferredToolPlaceholder moving +// relative to its neighbors with no add/remove) as a side effect, +// since output order is ALWAYS the first-seen order, never the +// incoming array's order; +// - present but fingerprint-changed → the one honest case: passthrough +// + full reset (the directive's "never paper over a real edit" — and +// specifically never serve a stale schema for a name that changed). +// A new name (not in the known set) is additively marked +// defer_loading:true and announced via one appended tool_addition system +// block, exactly as before. Any combination of held + new in the same +// request composes (both are additive from the wire's perspective; only +// a fingerprint change is destructive). +// +// Phase B stops at: documented shapes + persistent re-injection, +// validated by unit tests and replay A/B (directive addendum's gates 1-2). +// The final live acceptance probe (gate 3: one real request through the +// proxy at a session boundary, watch for 400 vs the model using the +// added tool) happens before the service-unit flag flips — the header +// plumbing this depended on was fixed in server.mjs 10d33e4. +// +// Activation: `enabled: true` in extensions.json (always loaded), runtime +// gate CACHE_FIX_TOOL_REWRITE=1, default OFF per directive ("Phase A (build +// now, env-gated CACHE_FIX_TOOL_REWRITE=1, default off)"). Order 425 — after +// sort-stabilization (200, so tools[] arrives name-sorted — comparisons and +// output order are keyed on name, not incoming array order); +// before ttl-management (500), consistent with the rest +// of the body-shaping extensions running ahead of the TTL pass. + +import { appendFile, mkdir, readFile, rename, writeFile } from "node:fs/promises"; +import { join } from "node:path"; +import { claudeHome } from "../claude-home.mjs"; +import { resolveSessionId } from "./cache-telemetry.mjs"; +import { hashMessageContent, conversationSubKey } from "./message-hash.mjs"; +import { systemPromptSubKey } from "./insertion-normalization.mjs"; +import { createHash } from "node:crypto"; + +// Models known to ACCEPT the mid-conversation-tool-changes contract. +// +// Opt-IN, not opt-out, and that direction is the whole point. On 2026-07-28 +// a sonnet-5 subagent dispatch died with: +// +// API Error: 400 tool_addition/tool_removal is not supported on this model +// +// The tool_addition block is a documented beta, but support is per-MODEL and +// this extension applied it to whatever came through. A cache mitigation that +// can HARD-FAIL a request is strictly worse than no mitigation, so an unknown +// model gets no announcement: it degrades to forwarding the new tool +// normally (a tools[] change, i.e. the bust we would have prevented) instead +// of a 400 that loses the request outright. +// +// This file's own header prescribed exactly this check — "the final live +// acceptance probe (gate 3: one real request through the proxy at a session +// boundary, watch for 400 vs the model using the added tool) happens before +// the service-unit flag flips". The flag was flipped without running it. +// +// Evidence, not guesswork — tools/probe-tool-addition.mjs measures a model +// in one real request (same OAuth path as production, wire shapes imported +// from this file). Add a prefix here only with a real request behind it. +// +// claude-opus-5 ACCEPTED sessions 58c979ce and 538c0aef, injections on +// the wire, no 400. +// claude-sonnet-5 REJECTED the 2026-07-28 live 400 above. +// claude-haiku-4-5 REJECTED probe 2026-07-29: "tool_addition/tool_removal +// requires a model that supports mid-conversation +// system content; this model does not" — the +// probe surfaced the CAPABILITY the beta gates +// on, which the sonnet error never named. +// claude-fable-5 ACCEPTED live probe 2026-07-29, session c05a754c: a +// disposable `claude -p` run through a throwaway +// proxy (CACHE_FIX_TOOL_ADDITION_EXTRA) injected +// the announcement for a mid-run ToolSearch load; +// production's capture holds the block at +// messages[4], the forwarded body hash matches +// the recorded outSha byte-for-byte, and the +// outcome record shows the API streamed a 200. +// (Direct-API probes 429 on this subscription for +// ALL big models — hand-built OAuth requests are +// refused regardless of quota, so the through-CC +// path is the only working probe for them; +// haiku's direct probe worked because CC itself +// sends it free-form utility traffic.) +const TOOL_ADDITION_MODELS = ["claude-opus-5", "claude-fable-5"]; + +// CACHE_FIX_TOOL_ADDITION_EXTRA: comma-separated additional prefixes, +// read per call like every gate. It exists for ONE purpose — the directive's +// live acceptance probe: a throwaway proxy instance sets it so a disposable +// real session can carry the announcement to a candidate model without +// touching the production allowlist. It is never set in the service unit; +// an ACCEPTED result graduates to TOOL_ADDITION_MODELS with its evidence, +// the override does not substitute for the entry. +export function supportsToolAddition(model) { + if (typeof model !== "string") return false; + const extra = (process.env.CACHE_FIX_TOOL_ADDITION_EXTRA ?? "") + .split(",") + .map((s) => s.trim()) + .filter(Boolean); + return TOOL_ADDITION_MODELS.concat(extra).some((prefix) => model.startsWith(prefix)); +} + +const BETA_TOKEN = "mid-conversation-tool-changes-2026-07-01"; +const BETA_HEADER_NAME = "anthropic-beta"; + +const DEFAULT_FS = { readFile, writeFile, rename, appendFile, mkdir }; + +// Models already warned about in this process — the suppressed-announcement +// warning fires once per model, not per request. Module state is acceptable +// here precisely because losing it (restart, reload) only repeats a warning. +const warnedSuppressedModels = new Set(); + +// --- Env gates (read per-call, mirrors the insertion-normalization idiom) --- + +function isEnabled(env = process.env) { + return env.CACHE_FIX_TOOL_REWRITE === "1"; +} + +function isDebug(env = process.env) { + return env.CACHE_FIX_DEBUG === "1"; +} + +function debug(msg) { + if (isDebug()) process.stderr.write(`[deferred-tool-rewrite] DEBUG: ${msg}\n`); +} + +// --- Storage (snapshots-dir idiom, mirrors insertion-normalization) --- + +function getSnapshotDir() { + return join(claudeHome(), "cache-fix-snapshots"); +} + +function statePath(dir, sessionKey) { + return join(dir, `${sessionKey}-deferred-tool-canon.json`); +} + +function eventsPath(dir, sessionKey) { + return join(dir, `${sessionKey}-deferred-tool-events.jsonl`); +} + +// State: { tools: [...], additions: [{ name, anchorHash, message }] }. +// `additions` (Phase B) carries each injected system message byte-frozen, +// plus the identity hash of the message it was anchored after. Old files +// without the field read as additions=[] — no migration, sessions started +// under Phase A simply have no pending injections. +async function loadState(dir, sessionKey, fs) { + try { + const txt = await fs.readFile(statePath(dir, sessionKey), "utf-8"); + const parsed = JSON.parse(txt); + if (!Array.isArray(parsed?.tools)) return null; + return { tools: parsed.tools, additions: Array.isArray(parsed.additions) ? parsed.additions : [] }; + } catch (err) { + if (err && err.code !== "ENOENT") debug(`state read failed: ${err?.message ?? err}`); + return null; + } +} + +async function saveState(dir, sessionKey, state, fs) { + await fs.mkdir(dir, { recursive: true }); + const finalPath = statePath(dir, sessionKey); + const tmpPath = `${finalPath}.${process.pid}.${Date.now()}.${Math.random().toString(36).slice(2, 8)}.tmp`; + await fs.writeFile(tmpPath, JSON.stringify(state, null, 2)); + await fs.rename(tmpPath, finalPath); +} + +async function appendTelemetry(dir, sessionKey, record, fs) { + try { + await fs.mkdir(dir, { recursive: true }); + await fs.appendFile(eventsPath(dir, sessionKey), JSON.stringify(record) + "\n"); + } catch (err) { + debug(`telemetry append failed: ${err?.message ?? err}`); + } +} + +// --- Session key (same idiom as insertion-normalization) --- + +// Sub-keyed by system-prompt hash for the same reason insertion-normalization +// is (threat-matrix row 14): the session-id header is shared by the main +// thread, every subagent it dispatches, and CC's own sidecar calls +// (title-generation etc.) — but those carry DIFFERENT tools arrays. Keyed on +// the bare session id they all collide on one baseline, so each alternation +// reads as "a known tool's schema changed" and takes the honest-reset path, +// re-baselining against whichever tenant spoke last. +// +// Measured before this fix (2026-07-28, capture s-35d72503, 602 requests): +// SIX distinct (tools, system-prompt) combinations shared a single baseline, +// and enabling the rewrite RAISED main-conversation tools[] churn from 1 to 2 +// — the extension built to hold tools[] byte-stable was destabilising it. +// The directive never considered sidecars; only replay over real multi-tenant +// traffic surfaced it. +// The key carries a CONVERSATION sub-key as well as the system prompt. +// +// Without it (until 2026-07-28) every subagent of a session shared one tools +// baseline AND one set of persisted additions, because they all run the same +// agent system prompt. That is not merely noisy: the tool_addition +// announcement is anchored to a MESSAGE IDENTITY, so under a shared key the +// stored anchor belongs to a different conversation's history, fails to +// match, and injectAdditions falls back to "after the last user message" — a +// different index on every request. Measured on corpus s-0edbd11c: our output +// diverged at index 4 while CC's own history was byte-identical through index +// 23, twice, re-billing 19 messages that never changed. +// +// insertion-normalization hit the identical collision and was fixed hours +// earlier; this extension had the same key and did not get the fix. Hence +// conversationSubKey living in message-hash.mjs rather than in either +// extension — a second copy is a second truth, and the second consumer +// learning the lesson late is exactly what happened here. +export function resolveToolRewriteSessionKey(headers, body) { + const sid = headers ? resolveSessionId(headers) : null; + const conv = conversationSubKey(body?.messages); + if (sid) return `s-${sid.replace(/[^A-Za-z0-9_-]/g, "_")}-${systemPromptSubKey(body?.system)}-${conv}`; + const model = typeof body?.model === "string" ? body.model : "unknown"; + return `c-${model}-${conv}`; +} + +// --- Canonical tool comparison --- +// +// Only name/description/input_schema participate in the equality check — +// any OTHER field (e.g. a defer_loading marker WE ourselves might have +// added on a prior rewrite) is deliberately excluded, so re-classifying a +// tool object that happens to carry that marker can never misfire as "the +// existing tool's schema changed." +function canonicalize(value) { + if (Array.isArray(value)) return value.map(canonicalize); + if (value && typeof value === "object") { + const out = {}; + for (const key of Object.keys(value).sort()) out[key] = canonicalize(value[key]); + return out; + } + return value; +} + +// VOLATILE SUBSTRINGS inside a tool DESCRIPTION (2026-07-28). CC embeds the +// per-session console URL in the Bash tool's description — it is the commit +// trailer the model is instructed to write — and it does not embed it +// consistently: measured over 640 live requests, 628 carried it and 12 did +// not, with two transitions. Each transition is a tools[] byte change, and +// tools[] renders BEFORE system and messages, so no cache_control breakpoint +// can survive it; one of them cost 705k creation tokens on this session. +// +// Nothing about what Bash DOES changes across that flip — the session URL is +// not part of the tool's contract. So it is excluded from the identity and +// the first-seen description is forwarded: exactly the treatment +// insertion-normalization already applies to blocks in +// messages, one region over. +// +// Deliberately NARROW: only the session-URL shape. Any other description +// difference is still a real edit and still resets, because serving a stale +// schema for a tool whose contract changed is the one failure this extension +// must never produce. +const VOLATILE_DESC_PATTERNS = [ + // https://claude.ai/code/session_ — appears bare and as a + // "Claude-Session:" trailer line; the whole line goes either way. + /^.*https:\/\/claude\.ai\/code\/session_[A-Za-z0-9]+.*$/gm, +]; + +export function stripVolatileDescription(desc) { + if (typeof desc !== "string") return desc; + let out = desc; + for (const re of VOLATILE_DESC_PATTERNS) out = out.replace(re, ""); + // Collapse the blank lines the removal leaves behind, so a description that + // differs ONLY by the volatile line canonicalizes identically either way. + return out.replace(/\n{2,}/g, "\n").trim(); +} + +export function toolFingerprint(tool) { + if (!tool || typeof tool !== "object" || typeof tool.name !== "string") return null; + return JSON.stringify( + canonicalize({ + name: tool.name, + description: stripVolatileDescription(tool.description ?? null), + input_schema: tool.input_schema ?? null, + }), + ); +} + +// --- Core classifier (pure) --- +// +// Returns: +// { action: "no-baseline", knownTools } — first-seen session; persist baseline, forward unchanged +// { action: "unchanged", knownTools } — incoming === known set, same order; forward unchanged +// { action: "reset", knownTools, reason } — a known tool's schema changed; forward unchanged, re-baseline +// { action: "rewrite", tools, newNames, heldNames, knownTools } — held removal and/or reorder and/or pure addition; onRequest forwards forwardedTools(knownTools, additions) and injects the addition message +export function classifyToolChange(incomingTools, priorKnownTools) { + if (!Array.isArray(priorKnownTools)) { + return { action: "no-baseline", knownTools: incomingTools }; + } + + const priorByName = new Map(priorKnownTools.map((t) => [t.name, t])); + const incomingByName = new Map(incomingTools.map((t) => [t.name, t])); + + // Schema-change scan runs over every name present in BOTH sets — absence + // is handled separately below (held, not reset) — so a removal elsewhere + // in the array never short-circuits this check. + for (const [name, priorTool] of priorByName) { + const incomingTool = incomingByName.get(name); + if (incomingTool && toolFingerprint(incomingTool) !== toolFingerprint(priorTool)) { + return { action: "reset", knownTools: incomingTools, reason: "tool-schema-changed" }; + } + } + + const priorOrderNames = [...priorByName.keys()]; + const heldNames = priorOrderNames.filter((name) => !incomingByName.has(name)); + const newNames = [...incomingByName.keys()].filter((name) => !priorByName.has(name)); + + const incomingOrderNames = incomingTools.map((t) => t.name); + const orderMatches = + heldNames.length === 0 && + newNames.length === 0 && + incomingOrderNames.length === priorOrderNames.length && + incomingOrderNames.every((name, i) => name === priorOrderNames[i]); + + if (orderMatches) { + return { action: "unchanged", knownTools: priorKnownTools }; + } + + const newTools = newNames.map((name) => incomingByName.get(name)); + const deferredNewTools = newTools.map((t) => ({ ...t, defer_loading: true })); + // First-seen order, for every name ever known — held (removed) names + // included, using their frozen object so wire bytes never drift for a + // tool whose content didn't actually change. + const heldOrPresentTools = priorOrderNames.map((name) => priorByName.get(name)); + + return { + action: "rewrite", + tools: heldOrPresentTools.concat(deferredNewTools), + newNames, + heldNames, + knownTools: priorOrderNames.concat(newNames).map((name) => priorByName.get(name) ?? incomingByName.get(name)), + }; +} + +// --- Wire shapes (documented mid-conversation-tool-changes contract) --- + +// The tool_addition announcement: one system-ROLE message in messages[] +// carrying a tool_addition block per newly-added tool. The tool must +// already be in tools[] with defer_loading: true; the block references it +// by name. See the directive addendum for the placement constraints this +// satisfies. +export function buildToolAdditionMessage(toolNames) { + return { + role: "system", + content: toolNames.map((name) => ({ + type: "tool_addition", + tool: { type: "tool_reference", name }, + })), + }; +} + +// Identity hash for an anchor message. hashMessageContent covers +// block-array content; string-content messages hash their raw string +// (same fallback family as insertion-normalization's content-derived +// identity — never positional). +export function anchorHash(msg) { + const h = hashMessageContent(msg); + if (h) return h; + const c = msg?.content; + if (typeof c === "string") return "s:" + createHash("sha256").update(c).digest("hex").slice(0, 16); + return null; +} + +// Splice persisted addition messages back into messages[] at their +// anchors. Pure: returns { messages, reanchored } without mutating input. +// Each addition lands immediately after the message whose identity hash +// matches its anchorHash; a vanished anchor (context-management prune) +// re-anchors after the LAST user message — the closest stable position +// that satisfies the "must follow a user message" placement constraint — +// and reports it so state can be updated and telemetry emitted. +// +// Resolution happens in a first pass against the ORIGINAL `messages` array +// (never mutated while resolving), so a SHARED anchor's landing position is +// computed once regardless of how many additions target it. This is what +// keeps the run FIFO — discovery order, oldest first — instead of the +// previous idx+1-per-addition splice, which re-found the same anchor fresh +// on every iteration (the search excludes role==="system", so +// already-injected additions were invisible to it) and always landed the +// newest addition closest to the anchor: a LIFO stack that reordered the +// already-forwarded prefix on every new addition (probe s-dc3f8071, +// n=372-397, 25 stability violations during an MCP discovery cascade). +export function injectAdditions(messages, additions) { + if (!Array.isArray(additions) || additions.length === 0) { + return { messages, reanchored: [] }; + } + + let lastUserIdx = -1; + for (let i = messages.length - 1; i >= 0; i--) { + if (messages[i].role === "user") { + lastUserIdx = i; + break; + } + } + + const reanchored = []; + // Original-array index -> messages to inject right after it, in discovery + // (oldest-first) order — the run for a shared anchor. + const byAnchorIdx = new Map(); + + for (const add of additions) { + const idx = messages.findIndex((m) => m.role !== "system" && anchorHash(m) === add.anchorHash); + let landingIdx = idx; + if (idx < 0) { + if (lastUserIdx >= 0) { + landingIdx = lastUserIdx; + reanchored.push({ names: add.names, anchorHash: anchorHash(messages[lastUserIdx]) }); + } else { + // No user message at all — cannot satisfy the placement + // constraint; skip this injection (the tool stays deferred and + // unloaded this request; honest degradation, not a malformed + // request). + reanchored.push({ names: add.names, anchorHash: null }); + continue; + } + } + if (!byAnchorIdx.has(landingIdx)) byAnchorIdx.set(landingIdx, []); + byAnchorIdx.get(landingIdx).push(add.message); + } + + const out = []; + messages.forEach((m, i) => { + out.push(m); + const injected = byAnchorIdx.get(i); + if (injected) out.push(...injected); + }); + + return { messages: out, reanchored }; +} + +// The frozen tools[] to forward when additions exist: knownTools order, +// with every name covered by an addition marked defer_loading — the +// classifier's knownTools stores UNMARKED objects (fingerprints must +// match CC's raw array), so the marker is applied at forward time. +export function forwardedTools(knownTools, additions) { + const deferredNames = new Set(additions.flatMap((a) => a.names)); + return knownTools.map((t) => (deferredNames.has(t.name) ? { ...t, defer_loading: true } : t)); +} + +// (Phase A's placeholder — a pseudo-XML text block appended to top-level +// body.system — was removed in Phase B: wrong shape, and decisively wrong +// location, since top-level system heads the cache prefix and every +// injection there would have busted the whole cache.) + +// --- Beta header (additive token; reuses no state from auto-1m-guard, but +// mirrors its header-token parse/join idiom rather than reimplementing ad +// hoc string splitting) --- + +function findBetaHeader(headers) { + if (!headers) return null; + for (const k of Object.keys(headers)) { + if (k.toLowerCase() === BETA_HEADER_NAME) return { key: k, raw: headers[k] }; + } + return null; +} + +function parseBetaTokens(raw) { + if (!raw) return []; + if (Array.isArray(raw)) return raw.map(String).map((s) => s.trim()).filter(Boolean); + if (typeof raw === "string") return raw.split(",").map((s) => s.trim()).filter(Boolean); + return []; +} + +export function addBetaToken(headers) { + const found = findBetaHeader(headers); + const tokens = found ? parseBetaTokens(found.raw) : []; + if (tokens.includes(BETA_TOKEN)) return; // already present — idempotent + tokens.push(BETA_TOKEN); + const key = found ? found.key : BETA_HEADER_NAME; + headers[key] = tokens.join(", "); +} + +// --- Extension contract --- + +export default { + name: "deferred-tool-rewrite", + description: + "Phase A: hold tools[] byte-stable across a pure tool addition, announcing the new tool via an appended " + + "tool_addition system block instead; also holds a harness-GC'd tool in place and pins output order to " + + "first-seen (works around CC's mid-conversation deferred-tool-load and tool-GC cache busts)", + enabled: false, // overridden by extensions.json + order: 425, + + async onRequest(ctx) { + if (!isEnabled()) return; + if (!ctx || !ctx.body) return; + + const body = ctx.body; + if (!Array.isArray(body.tools) || body.tools.length === 0) return; + + const dir = getSnapshotDir(); + const fs = DEFAULT_FS; + const headers = ctx.headers || null; + const sessionId = headers ? resolveSessionId(headers) : null; + const sessionKey = resolveToolRewriteSessionKey(headers, body); + + try { + const prior = await loadState(dir, sessionKey, fs); + const result = classifyToolChange(body.tools, prior?.tools ?? null); + + // Carry prior additions forward except on reset (a schema change + // re-baselines everything — the harness's own tools[] becomes truth + // and pending injections are abandoned with it). + let additions = result.action === "reset" ? [] : (prior?.additions ?? []); + + // Model gate, applied at the single point everything downstream reads. + // Emptying `additions` here disables the announcement, the + // defer_loading markers forwardedTools() derives from it, AND the beta + // header — one place rather than three, and it also neutralises state + // persisted before this gate existed (a session that accumulated + // additions under the old build must not keep replaying them into a + // model that 400s on them). + const announceOk = supportsToolAddition(body?.model); + if (!announceOk) additions = []; + + // A suppressed announcement is a real cost and must not be silent: the + // session pays a full-prefix bust per tool load exactly as if this + // extension were absent. The documented availability rule is "Opus + // onward", so a NEW model family landing here is most likely + // support-capable and unprobed — the warning names the probe so the + // gap closes in minutes instead of surviving until someone reads + // telemetry. Once per model per process; the telemetry entry carries + // `suppressed` on every occurrence. + const suppressed = + !announceOk && result.action === "rewrite" && (result.newNames?.length ?? 0) > 0; + if (suppressed && !warnedSuppressedModels.has(body?.model)) { + warnedSuppressedModels.add(body?.model); + process.stderr.write( + `[deferred-tool-rewrite] model ${body?.model} is not allowlisted for tool_addition — ` + + `tools[] busts are being paid (${result.newNames.join(",")}). ` + + `Probe it: see tools/probe-tool-addition.mjs (big models need the through-proxy method).\n`, + ); + } + + // The announcement path is gated on model support; the HOLD and + // ORDER-PIN paths are not, because neither needs the beta contract — + // they only ever re-send tools the model already understands. + if ( + announceOk && + result.action === "rewrite" && + result.newNames.length > 0 && + Array.isArray(body.messages) && + body.messages.length > 0 + ) { + // New tool(s): ONE addition message covering them all, anchored + // after the current last message. Injected below with any prior + // additions, and persisted for re-injection on every subsequent + // request (the API is stateless — see file header). + const anchorMsg = body.messages[body.messages.length - 1]; + additions = additions.concat([ + { + names: result.newNames, + anchorHash: anchorHash(anchorMsg), + message: buildToolAdditionMessage(result.newNames), + }, + ]); + } + + // Forward the frozen array whenever we hold state: rewrite uses the + // classifier's held order; "unchanged" ALSO re-forwards it when + // additions exist, because CC's incoming array never carries our + // defer_loading markers — forwarding it raw would silently un-defer + // every added tool. no-baseline and reset pass through untouched. + if (result.action === "rewrite") { + body.tools = forwardedTools(result.knownTools, additions); + } else if (result.action === "unchanged") { + // ALWAYS re-forward the frozen array here, not only when additions + // exist. Two reasons, and the second was measured the hard way: + // - CC's incoming array never carries our defer_loading markers, so + // forwarding it raw would silently un-defer every added tool; + // - "unchanged" now means "identical after volatile stripping", + // which includes descriptions that differ ONLY by the per-session + // console URL. Forwarding CC's raw array in that case would put + // the flip straight back on the wire and invalidate tools[] — + // making the identity fix pointless. The frozen array is the + // first-seen form, so the wire stays byte-stable. + body.tools = forwardedTools(prior.tools, additions); + } + + let reanchored = []; + if (additions.length > 0 && Array.isArray(body.messages)) { + const injected = injectAdditions(body.messages, additions); + body.messages = injected.messages; + reanchored = injected.reanchored; + if (reanchored.length > 0) { + additions = additions.map((a) => { + const r = reanchored.find((x) => x.names.join() === a.names.join()); + return r && r.anchorHash ? { ...a, anchorHash: r.anchorHash } : a; + }); + } + // Beta token whenever a deferred tool / injected message is on + // the wire — every request after the first addition. + if (headers) addBetaToken(headers); + } + + await saveState(dir, sessionKey, { tools: result.knownTools, additions }, fs); + + ctx.meta = ctx.meta || {}; + ctx.meta.deferredToolRewriteStats = { + action: result.action, + newNames: result.newNames ?? [], + heldNames: result.heldNames ?? [], + reason: result.reason ?? null, + injected: additions.length, + reanchored: reanchored.filter((r) => r.anchorHash).length, + }; + + await appendTelemetry( + dir, + sessionKey, + { + ts: new Date().toISOString(), + key: sessionKey, + sid: sessionId, + action: result.action, + newNames: result.newNames ?? [], + heldNames: result.heldNames ?? [], + injected: additions.length, + ...(suppressed ? { suppressed: true, model: body?.model } : {}), + ...(reanchored.length > 0 ? { reanchored } : {}), + ...(result.reason ? { reason: result.reason } : {}), + }, + fs, + ); + + if (isDebug()) { + process.stderr.write( + `[deferred-tool-rewrite] action=${result.action}` + + (result.newNames ? ` new=${result.newNames.join(",")}` : "") + + (result.heldNames && result.heldNames.length ? ` held=${result.heldNames.join(",")}` : "") + + (result.reason ? ` reason=${result.reason}` : "") + + "\n", + ); + } + } catch (err) { + debug(`onRequest unexpected: ${err?.message ?? err}`); + } + }, +}; diff --git a/proxy/extensions/fresh-session-sort.mjs b/proxy/extensions/fresh-session-sort.mjs index 29f448af..f5953356 100644 --- a/proxy/extensions/fresh-session-sort.mjs +++ b/proxy/extensions/fresh-session-sort.mjs @@ -149,8 +149,19 @@ export default { return; } - // Scan backwards to find latest instance of each relocatable block type + // Scan backwards to find latest instance of each relocatable block type. + // `occurrences` counts EVERY instance seen in the same pass (not just the + // kept one) — the extension's own record of whether the type it is about + // to relocate has ever appeared anywhere else in this array (including + // already at messages[firstUserIdx], before mutation). One occurrence + // means this relocation is the type's first appearance in the whole + // array — the deliberate one-time bust this extension exists for + // (see the module doc). More than one means it recurred — reported as + // such rather than folded into the same "first appearance" telemetry, + // so a consumer (replay's stability exemption) can tell the two apart + // instead of re-deriving it from shape. const found = new Map(); + const occurrences = new Map(); for (let i = body.messages.length - 1; i >= firstUserIdx; i--) { const msg = body.messages[i]; if (msg.role !== "user" || !Array.isArray(msg.content)) continue; @@ -158,7 +169,9 @@ export default { const block = msg.content[j]; const text = block.text || ""; const blockType = getBlockType(text); - if (!blockType || found.has(blockType)) continue; + if (!blockType) continue; + occurrences.set(blockType, (occurrences.get(blockType) ?? 0) + 1); + if (found.has(blockType)) continue; const fixedText = fixBlockText(blockType, text); const { cache_control, ...rest } = block; @@ -180,11 +193,24 @@ export default { // Prepend in deterministic order: deferred → mcp → skills → hooks const ORDER = ["deferred", "mcp", "skills", "hooks"]; - const toRelocate = ORDER.filter((t) => found.has(t)).map((t) => found.get(t)); + const relocatedTypes = ORDER.filter((t) => found.has(t)); + const toRelocate = relocatedTypes.map((t) => found.get(t)); body.messages[firstUserIdx] = { ...body.messages[firstUserIdx], content: [...toRelocate, ...body.messages[firstUserIdx].content], }; + + // Report what happened — nothing downstream re-derives this. A + // first-appearance relocation prepends content CC never had at + // messages[firstUserIdx] before, which is exactly the shape replay's + // cross-request stability check flags as a self-inflicted byte flip + // (module doc, top). Telemetry lets that check tell the deliberate + // one-time bust apart from a genuine repeat/thrash at the same index. + ctx.meta = ctx.meta || {}; + ctx.meta.freshSessionSortStats = { + relocated: relocatedTypes.map((t) => ({ type: t, firstAppearance: occurrences.get(t) === 1 })), + targetIndex: firstUserIdx, + }; }, }; diff --git a/proxy/extensions/insertion-normalization.mjs b/proxy/extensions/insertion-normalization.mjs new file mode 100644 index 00000000..0869cdc5 --- /dev/null +++ b/proxy/extensions/insertion-normalization.mjs @@ -0,0 +1,1699 @@ +// insertion-normalization — re-serialize a mid-history splice back into +// arrival order so the prefix cache sees an append instead of a rewrite. +// +// Design: docs/directives/proxy-insertion-normalization.md (phase 2 of the +// the removed mid-history-breakpoint-ladder work). Implements the Design +// sketch rules 1-4 only; the "Alternative considered" (full marker +// ownership) section is explicitly NOT built here. +// +// Activation: `enabled: true` in extensions.json (always loaded), runtime +// gate CACHE_FIX_INSERTION_NORMALIZE=1 (opt-in, read per-call so tests can +// flip it without re-importing). CACHE_FIX_DEBUG honored for swallowed +// I/O errors, same idiom as prefix-diff. +// +// Order 395 — after read-dedupe (380), before cache-control-normalize +// (400), so the marker-placing pass sees the normalized order. (Two other +// marker placers once sat at 410 and 420; both were removed 2026-07-28 — +// see message-hash.mjs.) +// Verified-safe adjacent slot: read-dedupe only rewrites LATER duplicate +// occurrences of a Read tool_result (the first/keeper occurrence is never +// rewritten, and "keeper" is monotonic — a message that was already the +// earliest occurrence of its dedupe key stays the earliest occurrence as +// new messages arrive), so a message already recorded in canonical never +// has its content-hash change out from under it by running after +// read-dedupe. content-strip (330) and microcompact-stability (350) run +// even earlier, so their output is what canonical hashes see from the +// start — no special handling needed for those either. +// +// --- Canonical history model --- +// +// Per session (keyed off the session-id header, same derivation as +// prefix-diff post-fc432bf — SUB-KEYED additionally by a hash +// of the request's system prompt, see systemPromptSubKey/threat-matrix +// row 14: sidecar requests such as title-generation share the session-id +// header with the main thread but carry a different system prompt, so +// without the sub-key every sidecar turn thrashed the main thread's +// canonical back to reset), the proxy holds an append-only list of entry +// identity records: { h: contentHash, r: role, o: occurrence }. +// The hash is computed AFTER stripping cache_control (message-hash.mjs's +// hashMessageContent, imported rather than reimplemented) so a marker placed by a downstream extension never +// changes an entry's identity. `o` is a 0-based occurrence counter over +// (hash, role) pairs in array order, which disambiguates duplicate +// identical messages (directive's "Known risks to resolve"). +// +// --- Classification --- +// +// On each request, canonical entries are matched into the incoming +// messages array by identity. Two things can go wrong with that match, +// and either one sends the request to rule 3 (passthrough + reset): +// - some canonical entry has no matching identity in incoming (covers +// true edits, removals, assistant-content changes, and a shrunk +// history — a shorter incoming array can never contain every +// canonical entry); +// - the matched incoming indices are not strictly increasing (the +// canonical order isn't preserved as a subsequence). +// +// If the match holds, incoming entries not matched into canonical are +// "new". New entries positioned AFTER every matched canonical index are +// ordinary tail growth (the ordinary shape of a conversation advancing — +// including a new assistant turn, which is expected and never restricted). +// New entries positioned AT OR BEFORE the last matched canonical index are +// the actual splice: content Claude Code inserted earlier than where it +// arrived. Rule 2 (INSERTION-ONLY) applies only to those: +// - every such entry's role must not be "assistant" (the directive says +// "user-role or system-role — never assistant"; this transport's +// messages[] array only ever carries role "user" or "assistant" — the +// system prompt is a separate top-level field, never a messages[] +// entry — so this reduces to "must be role user". Surfaced as a GAP +// rather than silently assumed away: see the closing report.); +// - re-serializing (canonical order first, then ALL new entries — +// spliced and tail alike — appended in their incoming relative order) +// must not separate any tool_result-bearing user message from an +// immediately-preceding assistant message carrying the matching +// tool_use id(s). +// +// When both hold, the request is re-serialized and forwarded; canonical +// grows by appending the new entries' identities (in the same order they +// were appended to the message array). When either fails, or when the +// match itself failed, the request passes through UNCHANGED and canonical +// resets to a fresh identity list computed from incoming — one honest +// bust, per the directive's conservative bias. +// +// Note the re-serialization formula subsumes plain append: when every new +// entry is already tail growth, "canonical order + new entries appended +// in arrival order" reproduces incoming byte-for-byte. The two cases are +// told apart only for telemetry (action: "append-only" when nothing +// moved, "normalized" when a splice was detected and corrected). +// +// --- Phase 3: volatile-block pinning + removal tolerance (opt-in) --- +// +// Directive: docs/directives/proxy-volatile-block-pinning.md. Gated +// separately by CACHE_FIX_VOLATILE_PIN=1 so the phase-2 behavior above is +// byte-identical when the flag is off — the two modes even keep separate +// canonical identity math, and a canon file written under one mode is +// ignored by the other (one honest reset at the flag flip, never a +// mismatch). +// +// WHAT THE FLIP COSTS, measured when it was actually thrown (2026-07-28 +// 17:08, live): the reset is per-conversation and lands on the FIRST request +// after the flip, so a session already deep in context re-caches all of it — +// here cache_read 605,220 -> 15,132 with 678,522 creation tokens, the first +// post-flip request reporting `cause=messages@4(assistant)`. The canon ledger +// shows it plainly: `reset/no-prior-canonical` under a NEW canon key, +// `append-only` immediately after. That is the documented behaviour working, +// not a defect — but it is a real one-time bill, so throw this flag at a +// session boundary or on a young session, never mid-way through a long one. +// It cannot recur for a session once flipped. +// +// (A canon migration — read the phase-2 file, re-derive pin identities — would +// remove the cost. Deliberately NOT built: it is one-time per session, and a +// migration path is a second identity code path to keep correct forever.) +// +// Pin mode changes two things, both measured on live traffic 2026-07-28: +// +// 1. FLIP ABSORPTION. CC serializes hook-injected additionalContext +// blocks nondeterministically for deep-history +// messages — present in one request, absent from the next (two +// attributed whole-context busts: 135k + 182k, both named by the +// prevContent/nowContent capture). In pin mode a user message's +// identity hash EXCLUDES volatile blocks (a text block that is +// entirely a wrap, or empty text — the observed +// flip counterpart), so both serializations match the same canonical +// entry, and the proxy forwards the FIRST-SEEN bytes: byte-stable +// history, the flip never reaches the cache. Hard limits: user-role +// only; text blocks only (tool_results are never volatile); a message +// carrying a cache_control marker is never rewritten; a non-volatile +// difference changes the identity hash and takes the reset path. +// +// 2. REMOVAL TOLERANCE. Same-tenant message-count shrinks are routine +// (91 measured; context-management-2025-06-27 confirmed in the wire +// beta set), and each one killed the phase-2 subsequence match — +// reset-per-prune, degrading the extension to a no-op for the rest of +// the session. In pin mode a canonical entry missing from incoming is +// marked dropped (kept in the file, flagged, never forwarded) and the +// match continues past the gap; order violations among SURVIVORS +// remain a hard reset, and dropping more than half the live entries +// resets too (that is a compaction, not a prune). + +import { appendFile, mkdir, readFile, rename, writeFile } from "node:fs/promises"; +import { createHash } from "node:crypto"; +import { join } from "node:path"; +import { claudeHome } from "../claude-home.mjs"; +import { resolveSessionId } from "./cache-telemetry.mjs"; +import { hashMessageContent, conversationSubKey } from "./message-hash.mjs"; + +const DEFAULT_FS = { readFile, writeFile, rename, appendFile, mkdir }; + +// --- Env gates (read per-call, mirrors the prefix-diff idiom) --- + +function isEnabled(env = process.env) { + return env.CACHE_FIX_INSERTION_NORMALIZE === "1"; +} + +// Phase-3 gate (volatile-block pinning + removal tolerance). Requires the +// phase-2 gate too: pin mode is a refinement of the canonical model, not +// an independent extension. +function isPinEnabled(env = process.env) { + return env.CACHE_FIX_VOLATILE_PIN === "1"; +} + +function isDebug(env = process.env) { + return env.CACHE_FIX_DEBUG === "1"; +} + +function debug(msg) { + if (isDebug()) process.stderr.write(`[insertion-normalize] DEBUG: ${msg}\n`); +} + +// --- Storage --- + +function getSnapshotDir() { + return join(claudeHome(), "cache-fix-snapshots"); +} + +// Sub-key on the system prompt (threat-matrix row 14): sidecar requests +// (title-generation etc.) share the session-id header with the main thread +// but carry a DIFFERENT system prompt. Keying persisted canonical state on +// the session-id header alone made every sidecar turn look like a splice +// against the main thread's canonical (or vice versa), thrashing it back +// to a reset — never corrupting, but degrading the extension to a no-op +// for that session. A short hash of system[0]'s text (mirrors prefix- +// diff's computeSessionKey idiom — same "cheap discriminator over the +// diffed content" shape, but used here as a SUB-key alongside the stable +// session-id, never as the sole key, so prefix-diff's own "self-defeating +// key" lesson doesn't apply: a change inside the hashed text can only ever +// route to a *different* bucket, never lose the lookup entirely) buckets +// the main thread and each distinct sidecar system prompt independently +// under the same session-id. +// +// Exported so sibling extensions that persist per-session state key it the +// same way — the collision is a property of the session-id header, not of +// this extension, so every consumer of that header needs the same sub-key. +export function systemPromptSubKey(system) { + let text; + if (typeof system === "string") { + text = system; + } else if (Array.isArray(system) && system.length > 0) { + const first = system[0]; + text = typeof first?.text === "string" ? first.text : JSON.stringify(first ?? null); + } else { + return "nosys"; + } + if (!text) return "nosys"; + return createHash("sha256").update(text).digest("hex").slice(0, 8); +} + +// Session-id header derivation, same idiom as prefix-diff +// (post-fc432bf: session-id header preferred, content-hash fallback for +// requests without it — direct API calls, tests). Sub-keyed on the system +// prompt (see systemPromptSubKey) so sidecar requests sharing the header +// bucket separately from the main thread. Old single-key state files +// (pre-sub-key) are simply abandoned under the new path — loadCanonical's +// existing ENOENT handling already treats an absent file as "no prior +// canonical" (ordinary session start), so no explicit migration is needed. +// CONVERSATION sub-key (2026-07-28) — row 14, one level deeper. The +// system-prompt hash separates a sidecar CLASS from the main thread, but not +// the individual conversations WITHIN a class: every subagent this session +// dispatches runs the same agent system prompt, so they all landed in one +// bucket and overwrote each other's canonical. Measured on real traffic +// (capture s-35d72503, 602 requests): one system-prompt bucket held 39 +// distinct conversations, another 12 — and the correlation with resets was +// total. +// +// conversation SWITCH within a bucket: 60 requests, 60 resets (100%) +// same conversation continuing : 538 requests, 4 resets (1%) +// +// 72 of 83 resets across both corpora were this artifact, not real history +// churn: each switch made the incoming history look like a wholesale rewrite +// of whatever tenant spoke last, which classifies as dropped-majority. The +// extension was spending almost all of its reset budget on a keying bug. +// +// msgs[0] identifies a conversation because it is the one entry nothing +// appends past. When compaction or context-management replaces it the key +// moves and the canonical is abandoned — one honest reset, exactly what the +// old key produced anyway on the same event, since a replaced msgs[0] fails +// the subsequence match regardless. +// Conversation identity from msgs[0]. hashMessageContent covers block-array +// content only (it strips cache_control per block) and returns null for +// STRING content — correct for its own callers, but as a bucket key that +// null collapsed every string-content conversation into one shared "empty" +// bucket: 56 of 602 requests in the measured capture, which is where the +// residual dropped-majority resets lived after the first sub-key attempt. +// Falling back to a hash of the raw content covers both shapes; a message +// carrying no content at all is the only remaining "empty". +// conversationSubKey now lives in message-hash.mjs — deferred-tool-rewrite +// needs the identical function, and a second copy is a second truth. + +export function resolveInsertionSessionKey(headers, messages, system) { + const sid = headers ? resolveSessionId(headers) : null; + const conv = conversationSubKey(messages); + if (sid) { + return `s-${sid.replace(/[^A-Za-z0-9_-]/g, "_")}-${systemPromptSubKey(system)}-${conv}`; + } + return `c-${conv}`; +} + +function canonPath(dir, sessionKey) { + return join(dir, `${sessionKey}-insertion-canon.json`); +} + +function eventsPath(dir, sessionKey) { + return join(dir, `${sessionKey}-insertion-events.jsonl`); +} + +// `mode` discriminates phase-2 ("plain") from phase-3 ("pin") canon +// files: their identity hashes are incompatible ("v:"-prefixed user +// hashes in pin mode), and without the marker a flag flip could +// PARTIALLY match the other mode's file (assistant hashes are shared), +// producing wrong dropped flags instead of the intended single honest +// reset. Old files without the field read as "plain". +async function loadCanonical(dir, sessionKey, fs, mode = "plain") { + try { + const txt = await fs.readFile(canonPath(dir, sessionKey), "utf-8"); + const parsed = JSON.parse(txt); + if (!Array.isArray(parsed?.entries)) return null; + if ((parsed.mode ?? "plain") !== mode) return null; + return parsed.entries; + } catch (err) { + if (err && err.code !== "ENOENT") debug(`canonical read failed: ${err?.message ?? err}`); + return null; + } +} + +async function saveCanonical(dir, sessionKey, entries, fs, mode = "plain") { + await fs.mkdir(dir, { recursive: true }); + const finalPath = canonPath(dir, sessionKey); + const tmpPath = `${finalPath}.${process.pid}.${Date.now()}.${Math.random().toString(36).slice(2, 8)}.tmp`; + await fs.writeFile(tmpPath, JSON.stringify({ mode, entries }, null, 2)); + await fs.rename(tmpPath, finalPath); +} + +async function appendTelemetry(dir, sessionKey, record, fs) { + try { + await fs.mkdir(dir, { recursive: true }); + await fs.appendFile(eventsPath(dir, sessionKey), JSON.stringify(record) + "\n"); + } catch (err) { + debug(`telemetry append failed: ${err?.message ?? err}`); + } +} + +// --- Identity --- + +// One identity record per message, in array order. `o` is the 0-based +// occurrence count of (hash, role) seen so far — disambiguates duplicate +// identical messages (directive's "Known risks to resolve at +// implementation time"). +export function computeIdentities(messages) { + const seen = new Map(); // "hash|role" -> next occurrence index + const out = []; + for (let i = 0; i < messages.length; i++) { + const msg = canonicalMessageShape(messages[i]); + const h = hashMessageContent(msg) ?? hashNonBlockContent(msg, i); + const r = msg?.role ?? "unknown"; + const key = `${h}|${r}`; + const o = seen.get(key) ?? 0; + seen.set(key, o + 1); + out.push({ index: i, h, r, o }); + } + return out; +} + +// Identity for a message `hashMessageContent` cannot hash — it returns null +// unless `content` is a block ARRAY, and CC sends plenty of messages whose +// content is a plain string (system notes, mid-conversation system blocks). +// +// This fallback used to be `noContent:${i}` — the array INDEX, which made a +// message's identity its position. That is self-defeating for an extension +// whose entire job is absorbing mid-history insertions: the first insertion +// ahead of such a message shifted its index, the canonical lookup missed, and +// classifyInsertion reset with "not-subsequence". Measured 2026-07-27 in one +// live session: 83 index-keyed entries in a single sub-key and 125 resets +// across 350 requests — roughly one request in three, i.e. the extension was +// rebuilding from scratch instead of normalizing. +// +// Hash the content instead, so identity travels with the message. Only a +// genuinely contentless message (null/undefined) still falls back to the +// index, where no better identity exists; `noContent:` is kept as that +// marker's prefix so old canonical files degrade to one reset rather than +// mismatching silently. +function hashNonBlockContent(msg, i) { + const c = msg?.content; + if (c === null || c === undefined) return `noContent:${i}`; + const text = typeof c === "string" ? c : JSON.stringify(c); + return "s:" + createHash("sha256").update(text).digest("hex").slice(0, 16); +} + +// SHAPE FLIP (measured 2026-07-28, census over 771 captured requests). CC +// re-serializes the SAME message between two equivalent shapes: +// +// [{ "type": "text", "text": "X" }] <-> "X" +// +// The model sees identical content either way, but the two shapes hash +// through different functions (hashMessageContent for block arrays, +// hashNonBlockContent for strings), so their identities could never match: +// the message read as "one entry dropped, a different one added" and took a +// reset. Applied here — at the one point every identity path passes through +// — rather than in the pin, because the flip is NOT user-role-specific: the +// census found it predominantly on SYSTEM messages (harness reminders), and +// a user-only fold left every one of those still resetting. +// +// Deliberately narrow: only the exact single-text-block <-> string pair, and +// only when the block carries nothing beyond type/text/cache_control. A +// multi-block array is a genuinely different message and keeps its own +// identity. +function canonicalMessageShape(msg) { + const c = msg?.content; + if (typeof c === "string") return { ...msg, content: [{ type: "text", text: c }] }; + if (!Array.isArray(c) || c.length !== 1) return msg; + const b = c[0]; + if (!b || typeof b !== "object" || b.type !== "text" || typeof b.text !== "string") return msg; + const extra = Object.keys(b).filter((k) => k !== "type" && k !== "text" && k !== "cache_control"); + if (extra.length) return msg; + return { ...msg, content: [{ type: "text", text: b.text }] }; +} + +function identityKey(entry) { + return `${entry.h}|${entry.r}|${entry.o}`; +} + +// --- Phase 3: volatile blocks and pin-mode identity --- + +// The wrap regex identity-normalization already uses — the harness marks +// its own injections with it. No allowlist of reminder texts: the flip +// evidence already covers four reminder kinds, and a pattern list would +// be the next mole (directive, part A). +// +// Captures the inner text (group 1) so the SAME regex serves both +// isVolatileBlock's boolean test (unaffected by adding a group) and +// suppression's unwrapVolatileText below — one pattern, not a second +// derivation of it (dev-loop.md, "never hand-roll identity in a probe"). +const VOLATILE_WRAP_REGEX = /^\n([\s\S]*)\n<\/system-reminder>\s*$/; + +// A text block is volatile iff it is entirely a system-reminder wrap OR +// empty — the observed flip alternates a reminder block with an +// empty-text block (capture 2026-07-27T22:13Z: prev = the reminder, +// now = ""), so both sides must classify volatile for the identities to +// meet. tool_result / tool_use / thinking blocks are NEVER volatile. +export function isVolatileBlock(block) { + if (!block || typeof block !== "object" || block.type !== "text") return false; + if (typeof block.text !== "string") return false; + if (block.text === "") return true; + return VOLATILE_WRAP_REGEX.test(block.text); +} + +// Identity hash for pin mode: user-role messages hash over their +// non-volatile blocks only (cache_control stripped, same as +// hashMessageContent). Assistant and string-content messages fall through to +// the phase-2 identity, which applies canonicalMessageShape itself — so the +// shape flip documented there is absorbed on every role, not just this path. +function hashPinnedIdentity(msg) { + if (!msg || msg.role !== "user" || !Array.isArray(msg.content)) return null; + const kept = []; + for (const block of msg.content) { + if (isVolatileBlock(block)) continue; + if (block && typeof block === "object") { + const { cache_control, ...rest } = block; + kept.push(rest); + } else { + kept.push(block); + } + } + return "v:" + createHash("sha256").update(JSON.stringify(kept)).digest("hex").slice(0, 16); +} + +// Pin-mode identities: same record shape as computeIdentities, with the +// volatile-excluded hash for user block-array messages. The "v:" prefix +// keeps pin-mode canon files disjoint from phase-2 ones — a canon written +// under the other mode fails the identity match wholesale and takes one +// honest reset, never a silent partial mismatch. +export function computePinnedIdentities(messages) { + const seen = new Map(); + const out = []; + for (let i = 0; i < messages.length; i++) { + const msg = canonicalMessageShape(messages[i]); + const h = + hashPinnedIdentity(msg) ?? hashMessageContent(msg) ?? hashNonBlockContent(msg, i); + const r = msg?.role ?? "unknown"; + const key = `${h}|${r}`; + const o = seen.get(key) ?? 0; + seen.set(key, o + 1); + out.push({ index: i, h, r, o }); + } + return out; +} + +// --- Tool_result / tool_use adjacency invariant --- +// +// For every user message carrying >=1 tool_result block, the immediately +// preceding message must be an assistant message whose tool_use blocks +// cover every tool_use_id referenced by this message's tool_result +// blocks. Violating this is a hard API-shape break, not just a cache +// concern — the directive requires falling back to rule 3 rather than +// producing an invalid re-serialization. +export function validateToolAdjacency(messages) { + for (let i = 0; i < messages.length; i++) { + const msg = messages[i]; + if (!msg || msg.role !== "user" || !Array.isArray(msg.content)) continue; + const toolUseIds = msg.content + .filter((b) => b && b.type === "tool_result" && typeof b.tool_use_id === "string") + .map((b) => b.tool_use_id); + if (toolUseIds.length === 0) continue; + + const prev = messages[i - 1]; + if (!prev || prev.role !== "assistant" || !Array.isArray(prev.content)) return false; + const prevToolUseIds = new Set( + prev.content.filter((b) => b && b.type === "tool_use" && typeof b.id === "string").map((b) => b.id), + ); + for (const id of toolUseIds) { + if (!prevToolUseIds.has(id)) return false; + } + } + return true; +} + +// --- Core classifier (pure) --- +// +// Returns: +// { action: "reset", resetReason, canonicalEntries } — passthrough, canonical := fresh(incoming) +// { action: "append-only", messages, canonicalEntries, inserted } — passthrough (formula reproduces incoming) +// { action: "normalized", messages, canonicalEntries, inserted } — re-serialized, forward `messages` +export function classifyInsertion(messages, priorCanonical) { + const incomingIdentities = computeIdentities(messages); + + if (!Array.isArray(priorCanonical) || priorCanonical.length === 0) { + return { + action: "reset", + resetReason: "no-prior-canonical", + canonicalEntries: incomingIdentities.map((e) => ({ h: e.h, r: e.r, o: e.o })), + }; + } + + const incomingByKey = new Map(incomingIdentities.map((e) => [identityKey(e), e.index])); + + const matchedIndices = []; + for (const stored of priorCanonical) { + const idx = incomingByKey.get(identityKey(stored)); + if (idx === undefined) { + return { + action: "reset", + resetReason: "not-subsequence", + canonicalEntries: incomingIdentities.map((e) => ({ h: e.h, r: e.r, o: e.o })), + }; + } + matchedIndices.push(idx); + } + for (let i = 1; i < matchedIndices.length; i++) { + if (matchedIndices[i] <= matchedIndices[i - 1]) { + return { + action: "reset", + resetReason: "not-subsequence", + canonicalEntries: incomingIdentities.map((e) => ({ h: e.h, r: e.r, o: e.o })), + }; + } + } + + const matchedSet = new Set(matchedIndices); + const lastMatched = matchedIndices.length > 0 ? matchedIndices[matchedIndices.length - 1] : -1; + const newEntries = incomingIdentities.filter((e) => !matchedSet.has(e.index)); + const splicedEntries = newEntries.filter((e) => e.index <= lastMatched); + + if (splicedEntries.length === 0) { + // Pure tail growth — the re-serialization formula reproduces `messages` + // unchanged, so skip building it and just report append-only. + const canonicalEntries = priorCanonical.concat(newEntries.map((e) => ({ h: e.h, r: e.r, o: e.o }))); + return { action: "append-only", messages, canonicalEntries, inserted: newEntries.length }; + } + + if (splicedEntries.some((e) => e.r === "assistant")) { + return { + action: "reset", + resetReason: "assistant-interleaved", + canonicalEntries: incomingIdentities.map((e) => ({ h: e.h, r: e.r, o: e.o })), + }; + } + + // Re-serialize: canonical order first, then ALL new entries (spliced and + // tail alike) appended in their incoming relative order. + const finalMessages = matchedIndices.map((idx) => messages[idx]).concat(newEntries.map((e) => messages[e.index])); + + if (!validateToolAdjacency(finalMessages)) { + return { + action: "reset", + resetReason: "adjacency-violation", + canonicalEntries: incomingIdentities.map((e) => ({ h: e.h, r: e.r, o: e.o })), + }; + } + + const canonicalEntries = priorCanonical.concat(newEntries.map((e) => ({ h: e.h, r: e.r, o: e.o }))); + return { action: "normalized", messages: finalMessages, canonicalEntries, inserted: newEntries.length }; +} + +// --- Phase 3 classifier (pure) --- + +function hasCacheControl(msg) { + if (!msg || !Array.isArray(msg.content)) return false; + return msg.content.some((b) => b && typeof b === "object" && b.cache_control); +} + +function stripAllCacheControl(msg) { + if (!msg || !Array.isArray(msg.content)) return msg; + return { + ...msg, + content: msg.content.map((b) => { + if (b && typeof b === "object" && b.cache_control) { + const { cache_control, ...rest } = b; + return rest; + } + return b; + }), + }; +} + +// Remove volatile blocks from a user message. When a canonical entry has +// no stored first-seen form (`m`), this IS the first-seen form: `m` is +// stored precisely when first-seen contained a volatile block, so its +// absence means first-seen had none — and stripping the incoming +// message's later-gained volatile blocks reproduces those bytes. +export function stripVolatileBlocks(msg) { + if (!msg || msg.role !== "user" || !Array.isArray(msg.content)) return msg; + const kept = msg.content.filter((b) => !isVolatileBlock(b)); + if (kept.length === msg.content.length) return msg; + return { ...msg, content: kept }; +} + +// A STANDALONE CARRIER: a message that is neither user nor assistant (in this +// transport, the mid-conversation `system` shape) whose whole content is one +// text block. That is the form CC parks a migrated reminder in, and the form +// of the task-tools nudge — the two message kinds the measured move shuffles +// between inline and standalone positions. +// +// Its first-seen bytes are stored for one reason only: when CC merges such a +// message INTO a neighbour's reminder and stops sending it (the cross-message +// join, findJoinMoves below), re-serving it is the only way the merge can be +// absorbed without dropping its bytes off the wire. Nothing else reads this +// `m` — pinnedForwardForm returns the incoming message untouched for any +// entry whose role is not "user", so storing it changes no forwarded byte on +// any existing path. +function isStandaloneCarrier(msg) { + if (!msg || msg.role === "user" || msg.role === "assistant") return false; + const shaped = canonicalMessageShape(msg); + return Array.isArray(shaped.content) && shaped.content.length === 1 && shaped.content[0]?.type === "text"; +} + +function buildPinEntry(identity, msg) { + const entry = { h: identity.h, r: identity.r, o: identity.o }; + if ( + msg?.role === "user" && + Array.isArray(msg.content) && + msg.content.some(isVolatileBlock) + ) { + // First-seen form, cache_control stripped: a marker the tail rotation + // happened to leave on this message at creation must not be replayed + // forever from the pin. + entry.m = stripAllCacheControl(msg); + } else if (isStandaloneCarrier(msg)) { + entry.m = stripAllCacheControl(msg); + } + return entry; +} + +// The bytes forwarded for a matched canonical entry. The pin applies only +// from the second appearance on: a NEW message (not yet canonical) always +// forwards as-is, so a fresh hook reminder reaches the model at the live +// edge; by the time the pin kicks in, the model has already consumed it. +// A message currently carrying a cache_control marker is never rewritten +// — markers sit at the tail, flips live deep, and losing a marker would +// cost more than one flip absorbs. +function pinnedForwardForm(stored, incomingMsg) { + if (stored.r !== "user") return incomingMsg; + if (hasCacheControl(incomingMsg)) return incomingMsg; + return stored.m ?? stripVolatileBlocks(incomingMsg); +} + +// --- Reminder-swap suppression (#76606, decision B) --- +// +// CC sometimes migrates a hook reminder OUT of the user message that +// carries it and INTO a standalone message of its own — measured directly +// (capture s-633915a8, n=26->28): message[30]'s -wrapped +// block is gone from message[30] and its inner text, wrapper stripped, +// is the entire content of a new message[31] (role system). Pinning above +// restores message[30]'s first-seen bytes, reminder included; treating the +// new standalone as ordinary tail growth then forwards the SAME text a +// second time, and because it lands mid-array the cache's +// longest-identical-prefix boundary moves to right before it — everything +// after is re-billed (measured: cacheRead 15424 / cacheCreation 124025). +// +// Strip the wrapper for comparison ONLY — never for what gets forwarded; +// the pin already owns that. Reuses VOLATILE_WRAP_REGEX's capture group +// rather than a second regex, per the same rule cited above it. +function unwrapVolatileText(block) { + if (!block || typeof block !== "object" || block.type !== "text" || typeof block.text !== "string") { + return block; + } + const m = VOLATILE_WRAP_REGEX.exec(block.text); + return m ? { type: "text", text: m[1] } : block; +} + +// The set of block identities this extension is CURRENTLY restoring — +// i.e. present in a LIVE (not dropped) canonical entry's stored first-seen +// form. Dropped entries are excluded on purpose: their content is not being +// served anywhere, so a new standalone message matching a dropped block +// must flow through normally rather than being silently discarded with no +// copy left at all. Scoped to VOLATILE blocks only (isVolatileBlock), since +// those are what buildPinEntry ever stores `m` for and what the measured +// migration shape moves — a plain text block coincidentally matching a +// pinned message's ordinary content is not this class. +function pinnedBlockHashes(priorCanonical) { + const hashes = new Set(); + if (!Array.isArray(priorCanonical)) return hashes; + for (const entry of priorCanonical) { + if (entry.d || !entry.m || !Array.isArray(entry.m.content)) continue; + for (const block of entry.m.content) { + if (!isVolatileBlock(block)) continue; + const h = hashMessageContent({ content: [unwrapVolatileText(block)] }); + if (h !== null) hashes.add(h); + } + } + return hashes; +} + +// The merged-standalone shape (measured 2026-07-30, capture s-633915a8, +// msg864, the 587k window): CC sometimes migrates ALL of a message's +// volatile blocks out TOGETHER, joined into one standalone message, +// rather than one standalone per block. pinnedBlockHashes above can never +// match that — it hashes one block at a time, and a merged message is one +// block whose text spans two reminders. A second set covers exactly the +// observed join: for each pinned entry with >=2 volatile blocks, hash the +// concatenation of ALL its volatile blocks' wrapper-stripped texts, in +// WIRE order, joined with "\n\n" — the exact separator measured on the +// real merged standalone (both hook reminders, 627 chars). No +// subset-merges: partial joins were never observed and would only invite +// false suppression on coincidental partial matches. "\n\n" is hardcoded +// to the one observed instance, not a general N-ary merge grammar — other +// separators are unobserved, and the census keeps watching for them. +// The one observed separator, named once. pinnedJoinHashes and the +// cross-message move recognition below are the same grammar seen from two +// sides, so they must not carry two copies of it. +const JOIN_SEPARATOR = "\n\n"; + +function pinnedJoinHashes(priorCanonical) { + const hashes = new Set(); + if (!Array.isArray(priorCanonical)) return hashes; + for (const entry of priorCanonical) { + if (entry.d || !entry.m || !Array.isArray(entry.m.content)) continue; + const volatileTexts = entry.m.content.filter(isVolatileBlock).map((b) => unwrapVolatileText(b).text); + if (volatileTexts.length < 2) continue; + const h = hashMessageContent({ content: [{ type: "text", text: volatileTexts.join(JOIN_SEPARATOR) }] }); + if (h !== null) hashes.add(h); + } + return hashes; +} + +// Is `msg` a suppressible duplicate of a currently-pinned block (or, since +// 2026-07-30, a currently-pinned entry's FULL joined volatile-block set)? +// Narrow by definition (BACKLOG #76606 part (c)): STANDALONE only (single +// block after the same string->one-block fold canonicalMessageShape +// already applies elsewhere in this file), and its wrapper-stripped bytes +// must exactly equal a hash in `pinnedHashes` or `joinHashes` — never a +// positional or role heuristic. `joinHashes` is optional (existing callers +// checking single-block duplicates only are unaffected). Returns the +// matched hash (for telemetry) or null (genuine content: no suppression, +// existing rules apply unchanged). +export function findSuppressibleDuplicate(msg, pinnedHashes, joinHashes) { + const shaped = canonicalMessageShape(msg); + if (!Array.isArray(shaped.content) || shaped.content.length !== 1) return null; + const h = hashMessageContent({ content: [unwrapVolatileText(shaped.content[0])] }); + if (h === null) return null; + if (pinnedHashes.has(h)) return h; + if (joinHashes && joinHashes.has(h)) return h; + return null; +} + +export { pinnedBlockHashes, pinnedJoinHashes }; + +// --- Cross-message join MOVE (threat-matrix row 4, the 2026-07-30 flap) --- +// +// The leg no hash set could match, measured on the real bytes (fixture +// flap-s-0dc8ac87c43d-86.json, request n=104): +// +// INLINE msg89 user [tool_result, tool_result, 683] +// msg90 system "The task tools haven't been used…" (421 chars) +// STANDALONE msg90 user [tool_result, tool_result] <- msg89, reminder shed +// msg91 system 683 + "\n\n" + 421 = 1106 <- BOTH, merged +// +// So one message's reminder and the WHOLE of the standalone next to it left +// together as a single new message, and msg90 stopped being sent at all. +// pinnedBlockHashes matches one block; pinnedJoinHashes matches all blocks of +// ONE entry. Neither can span two source messages, so msg91 read as genuine +// new content landing in dropped msg90's gap — which is exactly the +// co-location test isEdit uses, so classifyPinned returned reset("edit-shaped") +// before the suppression pass could run, and the whole 221k prefix was +// re-billed on every second flip. +// +// DEFINITION of a MOVE, narrowed to the measured shape and no further: +// within one request, a canonical entry D disappears from the wire while a +// NEW message N appears such that +// (a) D has stored first-seen bytes and is a standalone carrier — CC can +// only re-send what it once sent, and we can only re-serve what we +// kept; +// (b) P, the nearest LIVE canonical entry BEFORE D, is present on this +// request's wire and pins at least one reminder-WRAPPED block — the +// candidacy predicate (47defba): the wrapper is what makes a block the +// decoration CC relocates, and without it a message that merely shed a +// sibling reads as a migration source; +// (c) N's unwrapped text is exactly P's wrapped blocks joined with "\n\n", +// then "\n\n", then D's whole first-seen text — the two-constituent +// join in the measured order, never a subset, never another separator, +// never a third constituent; +// (d) N sits strictly inside D's gap — after P's wire index and before the +// next surviving canonical entry's — the same co-location discriminator +// isEdit uses, so a coincidental match elsewhere is not a move; +// (e) a surviving successor EXISTS. This bounds the search, and it also +// means N can never be the request's final message, so the tail guard +// below (a suppressed final message leaves the request ending on an +// assistant turn — three real 400s) cannot be reached from here; +// (f) N's role is "system" and D's stored role is "system" — the only +// measured shape, and `role:"system"` inside `messages[]` is legitimate +// wire shape (deferred-tool-rewrite relies on it). Without it the +// substitution could rewrite a message in some other role in place and +// the safety gate would fire on a role mismatch; no corpus instance +// exists, and the constraint keeps it that way rather than leaving the +// question to chance. Surfaced as a latent gap by the unit-2b build +// (its closing report §c5) and closed here. +// +// Everything else is out of scope by construction and stays on today's path +// byte-for-byte: subset merges, three-plus-block joins, other separators, +// moves of non-reminder content. +const isReminderWrapped = (b) => + b && typeof b === "object" && b.type === "text" && typeof b.text === "string" && b.text !== "" && + VOLATILE_WRAP_REGEX.test(b.text); + +// The whole text of a message that consists of exactly one text block, wrapper +// stripped. null for anything else — a multi-block message is not a standalone +// and cannot be a join constituent under the definition above. +function standaloneText(msg) { + if (!msg) return null; // an entry with no stored first-seen form + const shaped = canonicalMessageShape(msg); + if (!Array.isArray(shaped.content) || shaped.content.length !== 1) return null; + const b = unwrapVolatileText(shaped.content[0]); + return b && b.type === "text" && typeof b.text === "string" ? b.text : null; +} + +// The reminder side of the join: a pinned entry's wrapped blocks, unwrapped +// and joined in WIRE order — the same rule and separator pinnedJoinHashes +// uses, so a one-block entry yields just its text and a two-block entry +// yields the join the merged-standalone shape already matches. +function pinnedReminderText(entry) { + if (!entry?.m || !Array.isArray(entry.m.content)) return null; + const texts = entry.m.content.filter(isReminderWrapped).map((b) => unwrapVolatileText(b).text); + return texts.length ? texts.join(JOIN_SEPARATOR) : null; +} + +export function findJoinMoves({ messages, priorCanonical, matched, droppedNow, newEntries }) { + const moves = []; + if (!droppedNow || droppedNow.size === 0) return moves; + const ciToIdx = new Map(matched.map((m) => [m.ci, m.idx])); + for (const ci of droppedNow) { + const dText = standaloneText(priorCanonical[ci]?.m); + if (dText === null) continue; // (a) + if (priorCanonical[ci].r !== "system") continue; // (f) + + let pci = -1; + for (let j = ci - 1; j >= 0; j--) { + if (priorCanonical[j].d) continue; + pci = j; + break; + } + if (pci < 0 || !ciToIdx.has(pci)) continue; // (b) predecessor not on the wire + const pText = pinnedReminderText(priorCanonical[pci]); + if (pText === null) continue; // (b) predecessor pins no reminder + + const loIdx = ciToIdx.get(pci); + let hiIdx = -1; + for (let j = ci + 1; j < priorCanonical.length; j++) { + if (priorCanonical[j].d) continue; + if (ciToIdx.has(j)) { + hiIdx = ciToIdx.get(j); + break; + } + } + if (hiIdx < 0) continue; // (e) no surviving successor: unbounded gap, and the tail + + const wanted = pText + JOIN_SEPARATOR + dText; + for (const e of newEntries) { + if (e.index <= loIdx || e.index >= hiIdx) continue; // (d) + if (messages[e.index]?.role !== "system") continue; // (f) + const t = standaloneText(messages[e.index]); + if (t === null || t !== wanted) continue; // (c) + const hash = hashMessageContent({ content: [{ type: "text", text: t }] }); + if (hash === null) continue; + moves.push({ mergedIndex: e.index, ci, afterIdx: loIdx, hash }); + break; + } + } + return moves; +} + +// Pin-mode classification. Differences from classifyInsertion: +// - identities exclude volatile blocks (flip absorption); +// - canonical entries missing from incoming are marked dropped +// (`d: true`, kept in the file, skipped in later matches) instead of +// resetting — unless the dropped total passes half the canon, which +// reads as a compaction, not a prune; +// - matched user messages forward their first-seen form. +export function classifyPinned(messages, priorCanonical) { + const incoming = computePinnedIdentities(messages); + const freshEntries = () => incoming.map((e) => buildPinEntry(e, messages[e.index])); + + // A reset abandons the ORDER model. It must NOT abandon the PINS, and + // conflating the two cost real cache — threat-matrix row 22, measured + // 2026-07-28 on capture s-538c0aef: + // + // CC honestly replaced message 196, so reset(edit-shaped) was the right + // verdict and the cost belonged to 196+. But every reset returns without + // a `messages` field, so the caller forwards the incoming array raw — and + // that silently un-pinned message 177, whose first-seen + // this extension had been restoring. Our bytes changed at 177 while CC's + // were byte-identical there, so the bust began 19 messages early. + // + // Identity deliberately EXCLUDES volatile blocks, so an identity still + // present in priorCanonical names the same message and its stored + // first-seen bytes are still the right bytes to send. Pinning substitutes + // the CONTENT of a single user message and never adds, drops or reorders + // one, so applying it on a reset cannot affect count, roles or adjacency. + // + // Deliberately NOT used by the adjacency-violation reset: that path exists + // precisely because the pinned form broke tool adjacency, so it must send + // the raw array. + // + // The SAME argument, one mechanism over: a reset must not abandon a + // recognized MOVE either. Measured 2026-07-30 on capture s-dc3f8071 + // (n=196->197): the move was recognized on 196 and the absorbed entry's + // first-seen bytes served at wire index 223; on 197 the subsequence match + // failed, this path ran without move recognition, and the merged message + // went out raw again. Our bytes at 223 flipped where CC's were identical, + // moving the divergence 10 messages earlier than CC required — the row-22 + // shape exactly. Three captures that are otherwise clean reported it. + // + // Condition by condition, the pin argument transfers: + // - recognition needs no order model. findJoinMoves is a pure function of + // `matched`, `droppedNow`, `priorCanonical` and the wire, all of which + // this path already has, and the absorbed entry's first-seen bytes live + // in the canonical whatever the order did; + // - it FAILS CLOSED under disorder. Condition (d) bounds the merged + // message by its matched neighbours' wire indices, so in a scrambled + // request those bounds cross and nothing matches — raw forward, today's + // behaviour. The substitution can only fire where the local + // neighbourhood is still ordered; + // - it is slot-preserving: 1 -> 1, in place, so count, roles and + // adjacency are untouched, which is the pin argument verbatim. + const priorByKey = new Map( + (Array.isArray(priorCanonical) ? priorCanonical : []).map((e) => [identityKey(e), e]), + ); + const resetKeepingPins = (resetReason) => { + const out = messages.slice(); + let applied = 0; + for (const e of incoming) { + const stored = priorByKey.get(identityKey(e)); + if (!stored) continue; + const fwd = pinnedForwardForm(stored, messages[e.index]); + if (fwd !== messages[e.index] && JSON.stringify(fwd) !== JSON.stringify(messages[e.index])) { + out[e.index] = fwd; + applied++; + } + } + // Move substitutions, after the pins and on the same array. The two never + // collide: a pin applies to a MATCHED entry, a move replaces a NEW one. + // + // The RE-FIRES of already-reserved entries run here on exactly the same + // footing. The disposition pass that produced them needs no order model + // either — it resolves a neighbourhood out of `matched` and fails closed + // when the bounds collapse, which is the same fail-closed argument that + // lets move recognition run on this path at all. + const moves = findJoinMoves({ messages, priorCanonical, matched, droppedNow, newEntries: moveCandidates }); + const movedByMergedIdx = new Map(moves.map((m) => [m.mergedIndex, m])); + for (const mv of moves) out[mv.mergedIndex] = priorCanonical[mv.ci].m; + for (const rf of refires) out[rf.index] = priorCanonical[rf.ci].m; + + // The canonical must describe the wire we JUST FORWARDED — the same + // invariant the success path states. Building it from `messages` while + // sending `out` makes the two disagree, and the next request then + // diverges against a baseline that was never on the wire. Measured: that + // mistake turned 0 violations into 3 on capture s-0edbd11c before the + // canonical was switched to the pinned array. + // + // A moved slot therefore files the ABSORBED entry, not a fresh identity + // built from the merge: the merge is not what we sent there. Filing the + // merge would end the substitution after exactly one request — the + // absorbed entry would be gone from the canonical, nothing would be left + // to re-serve, and the flip would simply land on the next request. + // + // Suppression runs HERE too, not only on the success path. + // + // The defect this closes (measured 2026-07-31, session 77fe2779, the + // 11:41:05 request): CC pruned six ephemeral turns, the survivors stopped + // being a subsequence, and this reset fired. It kept the pins — the event + // recorded `pinned: 2` — but returned BEFORE the migrated-duplicate pass, + // so the event also recorded `suppressed: 0` and the standalone copy of an + // already-pinned reminder went out on the wire. The prefix broke at the + // host and everything after it re-billed: `edit@98 of 123`, transcript + // `cache_miss_reason messages_changed / 105006`, ~104 kB. + // + // The suppression built for exactly that shape was therefore disarmed by + // any reset — and resets are not rare (this file's own measurement: 125 + // across 350 requests, roughly one in three). A mitigation that switches + // off on a third of requests, silently, is the shape that reads as shipped + // and behaves as absent. + // + // The pins are already in hand here, which is what makes this correct + // rather than a second mechanism: a standalone duplicate is suppressible + // precisely when the inline form it duplicates is being restored, and + // `applied` above is that restoration. + const pinnedHashesR = pinnedBlockHashes(priorCanonical); + const pinnedJoinR = pinnedJoinHashes(priorCanonical); + const lastIdxR = messages.length - 1; + const suppressedR = new Set(); + // DECLARED, not merely counted. `suppressions` (the incoming indices) is + // what tools/replay.mjs keys its exemptions on — safetyViolation() filters + // them out of the input side before comparing lengths, and + // conservationViolations() accepts a missing unit only when it is part of a + // declared suppression. Reporting the COUNT alone left both gates blind on + // this path: replaying capture s-77fe2779 (conversation e7394e05, request + // 11:41:05.778Z) with the serving gates reported one safety violation + // (`length: 124 -> 123`) and one conservation violation (`lost: in[98]`) + // for a suppression that was working exactly as designed — a check firing + // on a non-defect, which is how a reader learns to ignore red. It also cost + // the per-suppression event lines in the telemetry log (onRequest emits one + // per entry of THIS array), i.e. the record dev-loop's "rule out ourselves" + // sweep reads — absent on the reset path, which is ~1 request in 3. + // + // ONE declaration array for BOTH suppression kinds, mirroring the success + // path: `kind: "join-move"` entries KEEP their slot (the absorbed entry is + // substituted into it above), plain duplicate entries are REMOVED from the + // forwarded array. tools/replay.mjs reads the kind to tell the two apart + // (`wireRemovedIndices` filters `kind !== "join-move"`), so a single array + // is what both gates already expect — two arrays would leave one of them + // blind on whichever kind it did not read. + const suppressionsR = []; + for (const e of incoming) { + const rf = refireByIdx.get(e.index); + if (rf) { + suppressionsR.push({ index: rf.index, hash: rf.hash, kind: "join-move" }); + continue; + } + const mv = movedByMergedIdx.get(e.index); + if (mv) { + // The merged message carries the bytes of TWO sources, so no single + // hash set can match it; findJoinMoves has already established that + // both constituents are on the wire (one pinned, one re-served into + // this very slot), which is the "a copy is present" condition the hash + // sets check. Declared here, never added to `suppressedR` — the slot + // stays, it just carries the first-seen bytes. + suppressionsR.push({ index: mv.mergedIndex, hash: mv.hash, kind: "join-move" }); + continue; + } + if (priorByKey.has(identityKey(e))) continue; // only entries CC newly sent + if (e.r === "assistant") continue; + if (e.index === lastIdxR) continue; // tail growth is never a stray migration + const h = findSuppressibleDuplicate(messages[e.index], pinnedHashesR, pinnedJoinR); + if (h !== null) { + suppressedR.add(e.index); + suppressionsR.push({ index: e.index, hash: h }); + } + } + const forwarded = suppressedR.size > 0 + ? out.filter((_, i) => !suppressedR.has(i)) + : out; + // A suppressed entry was never forwarded, so it must not enter the + // canonical either — same invariant the success path states: the canonical + // describes the wire we JUST FORWARDED. A MOVED or RE-FIRED slot is the + // opposite case: it IS on the forwarded wire, carrying the absorbed + // entry's bytes, so it files that entry — a newly recognized move with + // `rs` minted on it, a re-fire with `rs` kept, a reclaim re-keyed and no + // longer reserved. + // + // Reserved entries that neither re-fired nor reclaimed are not carried, + // which is this path's existing semantics for everything not on the wire + // (dropped entries are already discarded here, unlike on the success + // path). Fail-closed: the substitution simply stops. + const keptEntries = incoming.filter((e) => !suppressedR.has(e.index)); + return { + action: "reset", + resetReason, + canonicalEntries: keptEntries.map((e) => { + const mv = movedByMergedIdx.get(e.index); + if (mv) return { ...priorCanonical[mv.ci], rs: true }; + const rf = refireByIdx.get(e.index); + if (rf) return priorCanonical[rf.ci]; + const rc = reclaimedByIdx.get(e.index); + if (rc !== undefined) return storedAt(rc); + return buildPinEntry(e, out[e.index]); + }), + ...(applied > 0 || moves.length > 0 || refires.length > 0 || suppressedR.size > 0 + ? { messages: forwarded } + : {}), + pinned: applied, + moved: moves.length + refires.length, + suppressed: suppressionsR.length, + suppressions: suppressionsR, + reserves: [ + ...moves.map((m) => ({ index: m.mergedIndex, hash: m.hash })), + ...refires.map((r) => ({ index: r.index, hash: r.hash })), + ], + }; + }; + + if (!Array.isArray(priorCanonical) || priorCanonical.length === 0) { + return { action: "reset", resetReason: "no-prior-canonical", canonicalEntries: freshEntries() }; + } + + const incomingByKey = new Map(incoming.map((e) => [identityKey(e), e.index])); + + const matched = []; // { ci: index into priorCanonical, idx: incoming index } + const droppedNow = new Set(); + const reserved = []; // ci list: entries that left the wire-identity space + let droppedBefore = 0; + for (let ci = 0; ci < priorCanonical.length; ci++) { + const stored = priorCanonical[ci]; + if (stored.d) { + droppedBefore++; + continue; + } + // RESERVED-ENTRY IDENTITY (2026-07-31, the directive of that name). A + // re-served entry is one WE are keeping on the wire while CC has stopped + // sending it. Its stored key is (content-hash, role, occurrence-ordinal- + // within-the-request), and an ordinal is a claim about CC's array — an + // array this entry is not in. The claim goes false the moment CC sends one + // MORE copy of the same recurring text: the copy takes the ordinal, the + // entry binds to it at an unrelated position, and two things break at + // once — the entry leaves droppedNow so no move recognition can fire, and + // the inverted pair trips not-subsequence. Measured on capture s-dc3f8071 + // at n=196->197 (an eighth copy of a tail reminder took o=7 and bound the + // entry 13 slots away) and again, same shape and same merged-content hash, + // at n=399->400. Frozen in reset-move-s-dc3f8071-196-197.json. + // + // So a reserved entry does not participate in wire matching AT ALL: not + // looked up, not counted as dropped. A fresh copy of its text takes the + // next free ordinal, matches nothing, and classifies as an ordinary new + // entry on the existing append/splice path. Its stored key is retained for + // telemetry and debugging and is no longer load-bearing anywhere. + // + // Non-reserved entries keep absolute (h, r, o) matching byte-for-byte: + // the general ordinal instability of duplicate copies under middle-copy + // drops is a pre-existing class and deliberately out of scope here. + if (stored.rs) { + reserved.push(ci); + continue; + } + const idx = incomingByKey.get(identityKey(stored)); + if (idx === undefined) droppedNow.add(ci); + else matched.push({ ci, idx }); + } + + // --- Per-request disposition of the reserved entries --- + // + // What replaces the identity match: the entry's neighbourhood on THIS wire, + // resolved exactly as findJoinMoves' condition (d) resolves it — lo is the + // wire index of the nearest preceding live canonical entry (which must be + // matched), hi the wire index of the nearest following live matched one. + // One of three dispositions, in this order: + // + // RE-FIRE a wire message strictly inside (lo, hi) carries the merged form + // again -> re-serve the stored bytes into that slot, declare the + // join-move, keep the entry reserved. + // RECLAIM a wire message strictly inside carries the entry's WHOLE + // first-seen text -> CC flipped back to the original form (the + // measured oscillation leg). Clear `rs`, bind the entry to that + // wire index as an ordinary matched entry, and rewrite its stored + // key from that message's incoming identity so future absolute + // lookups are consistent. + // LAPSE neighbourhood resolvable, neither form present -> CC genuinely + // edited or pruned the region. The entry is not carried into the + // rebuilt canonical. NEVER re-serve stored bytes into a context + // that no longer carries the region — that is the one new risk + // this design introduces and this is its mitigation. + // + // Bounds unresolvable or crossed (neighbour dropped, unmatched, or disorder) + // -> the pass does NOTHING for this entry this request: no substitution and + // no state change, raw forward. Fail-closed, today's behaviour. + // + // Role constraint (f) applies to both probes exactly as it applies at the + // mint: the candidate's role must be "system" and so must the entry's. + const refires = []; // { ci, index, hash } + const reclaimedByIdx = new Map(); // wire index -> ci of the entry that reclaimed it + const lapsedCi = new Set(); + const heldCi = new Set(); // unresolvable neighbourhood: no state change + const reservedOverride = new Map(); // ci -> the re-keyed, rs-cleared entry + if (reserved.length > 0) { + const ciToIdx0 = new Map(matched.map((m) => [m.ci, m.idx])); + const claimed = new Set(matched.map((m) => m.idx)); + const reclaims = []; + for (const ci of reserved) { + const stored = priorCanonical[ci]; + const dText = standaloneText(stored.m); + let pci = -1; + for (let j = ci - 1; j >= 0; j--) { + if (priorCanonical[j].d) continue; + pci = j; + break; + } + // The first two conditions re-check what the mint already guaranteed — + // deliberately, and not as defensive padding for an impossible case: the + // mint happened in a PREVIOUS process, and this entry arrived through a + // canon file on disk. A deserialization boundary is where an invariant + // established in memory stops being established. The other two are the + // neighbourhood's lower bound. + if (dText === null || stored.r !== "system" || pci < 0 || !ciToIdx0.has(pci)) { + heldCi.add(ci); + continue; + } + const lo = ciToIdx0.get(pci); + let hi = -1; + for (let j = ci + 1; j < priorCanonical.length; j++) { + if (priorCanonical[j].d) continue; + if (ciToIdx0.has(j)) { + hi = ciToIdx0.get(j); + break; + } + } + if (hi < 0 || hi <= lo) { + heldCi.add(ci); + continue; + } + const pText = pinnedReminderText(priorCanonical[pci]); + const merged = pText === null ? null : pText + JOIN_SEPARATOR + dText; + let refireIdx = -1; + let reclaimIdx = -1; + for (let idx = lo + 1; idx < hi; idx++) { + if (claimed.has(idx)) continue; + if (messages[idx]?.role !== "system") continue; // (f) + const t = standaloneText(messages[idx]); + if (t === null) continue; + if (merged !== null && t === merged) { + refireIdx = idx; + break; + } + if (reclaimIdx < 0 && t === dText) reclaimIdx = idx; + } + if (refireIdx >= 0) { + const hash = hashMessageContent({ content: [{ type: "text", text: merged }] }); + if (hash === null) { + heldCi.add(ci); + continue; + } + claimed.add(refireIdx); + refires.push({ ci, index: refireIdx, hash }); + } else if (reclaimIdx >= 0) { + claimed.add(reclaimIdx); + const { rs, ...rest } = stored; + const inc = incoming[reclaimIdx]; + reservedOverride.set(ci, { ...rest, h: inc.h, r: inc.r, o: inc.o }); + reclaimedByIdx.set(reclaimIdx, ci); + reclaims.push({ ci, idx: reclaimIdx }); + } else { + lapsedCi.add(ci); + } + } + // A reclaimed entry is an ordinary matched entry from here on — the + // subsequence check, the edit-shaped co-location test and the canonical + // rebuild all read `matched` in canonical order, so it is merged in by ci + // rather than appended. + if (reclaims.length > 0) { + matched.push(...reclaims); + matched.sort((a, b) => a.ci - b.ci); + } + } + const refireByIdx = new Map(refires.map((r) => [r.index, r])); + const refiredCi = new Set(refires.map((r) => r.ci)); + const storedAt = (ci) => reservedOverride.get(ci) ?? priorCanonical[ci]; + + // Computed here rather than after the order checks below because + // resetKeepingPins needs `newEntries` to recognize a move, and both of the + // resets below are call sites. Nothing here depends on the order model — + // only on which identities matched — so hoisting it changes no value. + const matchedIdxSet = new Set(matched.map((m) => m.idx)); + const lastMatched = matched.length > 0 ? matched[matched.length - 1].idx : -1; + const newEntries = incoming.filter((e) => !matchedIdxSet.has(e.index)); + // A re-fired slot is already spoken for by the disposition pass, so it is + // not offered to findJoinMoves as a merged-message candidate — two canonical + // entries claiming one wire slot is exactly the state/wire disagreement the + // canonical-order invariant exists to forbid. + const moveCandidates = refires.length > 0 + ? newEntries.filter((e) => !refireByIdx.has(e.index)) + : newEntries; + + for (let i = 1; i < matched.length; i++) { + if (matched[i].idx <= matched[i - 1].idx) { + return resetKeepingPins("not-subsequence"); + } + } + if (droppedBefore + droppedNow.size > priorCanonical.length / 2) { + return resetKeepingPins("dropped-majority"); + } + + const splicedEntries = newEntries.filter((e) => e.index <= lastMatched); + + // A true EDIT decomposes under drop-tolerance into drop + splice: the old + // content's identity disappears and a new one appears IN ITS PLACE. That + // must still reset — never paper over a real content change. + // + // But "a drop and a splice occurred in the same request" is too coarse a + // test for it, because the two can be unrelated: measured 2026-07-28 + // (capture s-35d72503, request 09:47:31) a tail message was pruned by an + // operator interrupt while a hook reminder migrated mid-history 24 indices + // away — one prune plus one insertion, neither an edit, reset anyway. That + // single false positive was the last real reset in the corpus. + // + // Co-location is the discriminator: a dropped canonical entry sits in a + // definite gap — between its nearest surviving predecessor and successor — + // and only a spliced entry landing INSIDE that gap is a plausible + // replacement for it. A splice elsewhere is an independent insertion. + // A recognized MOVE is classified BEFORE the edit-shaped test, and only for + // candidacy-class content (findJoinMoves' definition). CC did not edit + // history here — it re-packaged a reminder and its neighbouring standalone + // into one message — so the honest response is to serve the first-seen form, + // not to abandon the order model. Everything the recognition does not match + // falls through to exactly today's path. + const joinMoves = findJoinMoves({ messages, priorCanonical, matched, droppedNow, newEntries: moveCandidates }); + const movedMergedIdx = new Set(joinMoves.map((m) => m.mergedIndex)); + const movedCi = new Set(joinMoves.map((m) => m.ci)); + + const matchedCi = new Set(matched.map((m) => m.ci)); + const isEdit = (() => { + if (droppedNow.size === 0 || splicedEntries.length === 0) return false; + // The merged message is not a replacement for the entry it absorbed, and + // that entry did not vanish — it is about to be re-served. Both sides of + // the co-location test therefore drop out of it. + const splicedIdx = splicedEntries.map((e) => e.index).filter((idx) => !movedMergedIdx.has(idx)); + if (splicedIdx.length === 0) return false; + for (const ci of droppedNow) { + if (movedCi.has(ci)) continue; + // Nearest surviving neighbours of the dropped entry, in incoming space. + let lo = -1; + for (let j = ci - 1; j >= 0; j--) { + if (!matchedCi.has(j)) continue; + lo = matched.find((m) => m.ci === j).idx; + break; + } + let hi = Infinity; + for (let j = ci + 1; j < priorCanonical.length; j++) { + if (!matchedCi.has(j)) continue; + hi = matched.find((m) => m.ci === j).idx; + break; + } + if (splicedIdx.some((idx) => idx > lo && idx < hi)) return true; + } + return false; + })(); + if (isEdit) { + return resetKeepingPins("edit-shaped"); + } + + if (splicedEntries.some((e) => e.r === "assistant")) { + return resetKeepingPins("assistant-interleaved"); + } + + // Suppress a NEW entry that duplicates a block this extension is already + // restoring elsewhere (see the block comment above findSuppressibleDuplicate). + // Assistant entries are excluded on principle even though the measured + // shape never produces one — silently dropping the model's own prior + // output is a correctness question this extension has no business + // deciding, unlike a hook reminder it already owns via the pin. + // Genuine change (normalized bytes differ from every pinned block): + // findSuppressibleDuplicate returns null, the entry is untouched here, + // and whatever the existing rules above already decided (append/splice/ + // edit-shaped reset) stands — no new reset path is introduced. + // TAIL GUARD (BACKLOG.md, "suppression can strip a request's FINAL + // message", 2026-07-30). Three real 400s ("must end with a user + // message"): report-enforcer injects identical instruction bytes at + // every SubagentStop; the first occurrence gets pinned, and when the + // SAME bytes arrive again as the resume request's ONLY/new final + // message, suppressing it left the forwarded array ending on the prior + // assistant turn. A tail-position duplicate is never a stray migration + // copy of already-pinned content — CC just sent it as the live, + // load-bearing final entry of THIS request, and the model needs to see + // it. Applies uniformly to both single-block and join-hash matches: the + // guard is positional, not about which hash set matched. + const lastIdx = messages.length - 1; + const pinnedHashes = pinnedBlockHashes(priorCanonical); + const pinnedJoin = pinnedJoinHashes(priorCanonical); + const suppressions = []; + for (const e of newEntries) { + if (e.r === "assistant") continue; + if (e.index === lastIdx) continue; + // A recognized move's merged message carries the bytes of TWO sources, so + // no single-hash set can match it; findJoinMoves has already established + // that both constituents are on the wire (one pinned, one re-served below), + // which is the same "a copy is present" condition the hash sets check. + if (movedMergedIdx.has(e.index)) { + suppressions.push({ index: e.index, hash: joinMoves.find((m) => m.mergedIndex === e.index).hash, kind: "join-move" }); + continue; + } + // A RE-FIRE is the same declaration for an already-reserved entry: the + // merged form is on the wire again, and the slot will carry the stored + // first-seen bytes instead. The gates must read it identically or the + // merged bytes report as lost. + const rf = refireByIdx.get(e.index); + if (rf) { + suppressions.push({ index: rf.index, hash: rf.hash, kind: "join-move" }); + continue; + } + const h = findSuppressibleDuplicate(messages[e.index], pinnedHashes, pinnedJoin); + if (h !== null) suppressions.push({ index: e.index, hash: h }); + } + const suppressedIdx = new Set(suppressions.map((s) => s.index)); + // A move is served IN PLACE OF the merged message — the re-served entry + // takes exactly the slot the merge occupied, which is the slot it held when + // it was first seen (it landed in that gap, immediately after its + // predecessor). One message in, one message out. + // + // The alternative — appending the re-serve after the predecessor and + // dropping the merge — was built first and was WRONG for a reason worth + // keeping: it made the move a deletion plus an insertion, so every check + // downstream needed to be told the OUTGOING index of a message we added, + // and that index is measured at THIS extension's tap point (order 395). + // deferred-tool-rewrite inserts its tool_addition announcement at order + // 425, so by the time the safety gate reads the forwarded array the number + // points at a different message: measured on capture s-0d6f38ba n=104, the + // recorded outIndex 89 held the re-served system message here and a + // `user [tool_result, tool_result, text]` in the final array, where the + // re-serve had shifted to 90 — 98 safety violations across the capture, + // all of them the instrument, none of them the conversation. Substituting + // in place needs no index to travel anywhere (dev-loop.md, "Tap points — + // every number names where it was measured"). + const movedByMergedIdx = new Map(joinMoves.map((m) => [m.mergedIndex, m])); + const reserves = []; + + // Forwarded order is the INCOMING order, not "survivors then new". The two + // agree for a plain append; they diverge when CC splices an entry + // mid-history, and concatenating new entries at the end would then reorder + // real content — the very thing this extension exists to prevent. + let pinApplied = 0; + const matchedByIdx = new Map(matched.map(({ ci, idx }) => [idx, ci])); + const finalMessages = []; + for (const e of incoming) { + if (suppressedIdx.has(e.index)) { + const mv = movedByMergedIdx.get(e.index); + if (mv) { + reserves.push({ index: mv.mergedIndex, hash: mv.hash }); + finalMessages.push(priorCanonical[mv.ci].m); + continue; + } + const rf = refireByIdx.get(e.index); + if (rf) { + reserves.push({ index: rf.index, hash: rf.hash }); + finalMessages.push(priorCanonical[rf.ci].m); + continue; + } + continue; // an ordinary duplicate: the pinned inline form already carries these bytes + } + const ci = matchedByIdx.get(e.index); + if (ci === undefined) { + finalMessages.push(messages[e.index]); + continue; + } + const fwd = pinnedForwardForm(storedAt(ci), messages[e.index]); + if (fwd !== messages[e.index] && JSON.stringify(fwd) !== JSON.stringify(messages[e.index])) { + pinApplied++; + finalMessages.push(fwd); + } else { + finalMessages.push(messages[e.index]); + } + } + + if (!validateToolAdjacency(finalMessages)) { + return { action: "reset", resetReason: "adjacency-violation", canonicalEntries: freshEntries() }; + } + + // POSITIONAL canonical rebuild (2026-07-28). Appending new entries to the + // tail records ARRIVAL order, not the order they occupy on the wire. When + // CC splits a message — hook reminders migrating out of a user message into + // their own system message is the measured case — the new entry is created + // mid-history but was filed at the end. Canonical order and wire order then + // disagreed permanently, and the next request touching that region failed + // the strictly-increasing check with `not-subsequence`. + // + // Measured before this fix (capture s-35d72503): an inversion at canonical + // position 81 for an entry that sits at wire index 79, and every remaining + // real reset in both corpora traced to exactly this. + // + // Rebuilding in incoming order fixes it. Dropped entries have no position + // in the new array, so they are re-inserted after the last surviving entry + // that preceded them — keeping them adjacent to their original neighbours + // so a later un-prune still matches in order. + const canonByIdx = new Map(); + for (const { ci, idx } of matched) canonByIdx.set(idx, storedAt(ci)); + const newByIdx = new Map(newEntries.map((e) => [e.index, buildPinEntry(e, messages[e.index])])); + const droppedAfter = new Map(); // incoming index -> canonical entries to trail it + { + let lastSeenIdx = -1; + for (let ci = 0; ci < priorCanonical.length; ci++) { + const entry = priorCanonical[ci]; + const hit = matched.find((m) => m.ci === ci); + if (hit) { + lastSeenIdx = hit.idx; + continue; + } + // A MOVED entry is absent from CC's array and PRESENT on ours — it was + // re-served into the merged message's slot — so it is neither dropped + // nor trailing: it is placed at that slot in the loop below, exactly + // where it sits on the wire we just forwarded. Marking it dropped, or + // trailing it here, would make the canonical describe an array we did + // not send, which is the invariant stated further down. + if (movedCi.has(ci)) continue; + // A RE-FIRED entry is likewise on the forwarded wire, at its own slot, + // and is placed there in the loop below. A LAPSED one is deliberately + // not carried at all — its region is gone from CC's array, so there is + // nothing left to re-serve into. + if (refiredCi.has(ci)) continue; + if (lapsedCi.has(ci)) continue; + // A HELD entry's neighbourhood could not be resolved this request, and + // the rule for that is NO STATE CHANGE — so it is carried forward + // exactly as stored, still reserved, and specifically NOT marked + // dropped: `d` is skipped by the match loop for good, which would retire + // an entry the pass has not decided about. + const marked = heldCi.has(ci) ? entry : (entry.d ? entry : { ...entry, d: true }); + if (!droppedAfter.has(lastSeenIdx)) droppedAfter.set(lastSeenIdx, []); + droppedAfter.get(lastSeenIdx).push(marked); + } + } + const canonicalEntries = []; + for (const trailing of droppedAfter.get(-1) ?? []) canonicalEntries.push(trailing); + for (const e of incoming) { + // A suppressed entry was never forwarded, so it gets no canonical + // identity — the invariant just below states the canonical must + // describe the wire we just forwarded, and this entry isn't on it. + // Recomputed fresh on every request (findSuppressibleDuplicate against + // the currently-live pins), so leaving no trace here is not a gap: CC + // keeps re-sending the duplicate as long as it believes it's part of + // history, and it is re-detected and re-suppressed every time — no + // persisted "suppressed" marker is needed for the suppression to stay + // stable across subsequent requests. + if (suppressedIdx.has(e.index)) { + // A moved entry occupies this slot on the forwarded wire, so it occupies + // it in the canonical too — the two must describe the same array. The + // MINT happens here: from this request on the entry is re-served, so it + // leaves the wire-identity space and carries `rs`. + const mv = movedByMergedIdx.get(e.index); + if (mv) canonicalEntries.push({ ...priorCanonical[mv.ci], rs: true }); + // A re-fire is the same slot one request later; `rs` is already set and + // stays set for as long as the re-serve keeps firing. + const rf = refireByIdx.get(e.index); + if (rf) canonicalEntries.push(priorCanonical[rf.ci]); + continue; + } + canonicalEntries.push(canonByIdx.get(e.index) ?? newByIdx.get(e.index)); + for (const trailing of droppedAfter.get(e.index) ?? []) canonicalEntries.push(trailing); + } + + const changed = splicedEntries.length > 0 || pinApplied > 0 || suppressions.length > 0 || reserves.length > 0; + return { + action: changed ? "normalized" : "append-only", + messages: finalMessages, + canonicalEntries, + // ORDER INVARIANT (2026-07-28). The canonical we just wrote must describe + // the wire we just forwarded: reading live entries in canonical order, the + // wire index each occupies must be STRICTLY INCREASING. + // + // This is the mechanism behind every reset class this extension has had. + // The arrival-order defect violated exactly this — canonical position 81 + // holding an entry that sits at wire index 79 — and was visible only + // downstream, as a not-subsequence reset on a LATER request whose cause + // had to be traced backwards. A size statistic cannot see it: a split adds + // one canonical entry AND one wire message, so the counts stay equal while + // the order diverges. Bite-tested both ways — a size-drift signal flagged + // nothing; this check names the exact inversion. + // + // Reported, not asserted: a violation is a defect in OUR state model, so + // it belongs in front of a developer with a location rather than being + // swallowed by a silent reset. + canonOrderViolation: (() => { + const wireOf = new Map(incoming.map((e) => [identityKey(e), e.index])); + let prev = -1; + let seen = 0; + for (const entry of canonicalEntries) { + if (entry.d) continue; + // A reserved entry's stored key is explicitly no longer load-bearing: + // it names an occurrence in an array CC no longer sends. Reading it + // here would resurrect the very collision the reservation removes — + // a stale key that happens to hit an unrelated copy would report our + // state model as drifted when it is exactly where we put it. + if (entry.rs) continue; + const idx = wireOf.get(identityKey(entry)); + if (idx === undefined) continue; + seen++; + if (idx <= prev) return { at: seen - 1, wireIdx: idx, prevWireIdx: prev }; + prev = idx; + } + return null; + })(), + // `inserted` counts what actually landed on the wire — a suppressed + // entry was a new entry CC sent but never one we forwarded, so it must + // not inflate this the way it would inflate a real insertion count. + inserted: newEntries.length - suppressions.length, + pinned: pinApplied, + // A moved entry is not dropped — it is still being served, from its + // first-seen bytes. Counting it here would report a prune that did not + // happen and would make the drop rate unreadable. + dropped: droppedNow.size - movedCi.size, + suppressed: suppressions.length, + suppressions, + // A re-fire is a move being served for another request. Counting only + // findJoinMoves' recognitions would report the substitution as having + // stopped on the very requests where it is doing its work — reservation + // takes the entry out of `droppedNow`, so recognition fires exactly once + // per move and every later request is a re-fire. + moved: joinMoves.length + refires.length, + reserves, + }; +} + +// --- Extension contract --- + +export default { + name: "insertion-normalization", + description: + "Re-serialize a mid-history splice (queued message / hook attachment / " + + "notification inserted earlier than its arrival) back into arrival " + + "order so the prefix cache sees an append instead of a rewrite", + enabled: false, // overridden by extensions.json + order: 395, + + async onRequest(ctx) { + if (!isEnabled()) return; + if (!ctx || !ctx.body) return; + + const body = ctx.body; + const messages = body.messages; + if (!Array.isArray(messages) || messages.length === 0) return; + + const dir = getSnapshotDir(); + const fs = DEFAULT_FS; + const headers = ctx.headers || null; + const sessionId = headers ? resolveSessionId(headers) : null; + const sessionKey = resolveInsertionSessionKey(headers, messages, body.system); + + try { + const pin = isPinEnabled(); + const mode = pin ? "pin" : "plain"; + const prior = await loadCanonical(dir, sessionKey, fs, mode); + const result = pin ? classifyPinned(messages, prior) : classifyInsertion(messages, prior); + + // Apply whatever the classifier produced, rather than keying on the + // action name. A reset now returns a pinned array too (row 22): the + // order model is abandoned, the pins are not. `append-only` returns the + // incoming array unchanged, so this stays a no-op there. + if (result.messages) { + body.messages = result.messages; + } + + await saveCanonical(dir, sessionKey, result.canonicalEntries, fs, mode); + + ctx.meta = ctx.meta || {}; + // canonSize / canonLive / msgs expose the STATE, not just the verdict. + // The append-vs-position defect (canonical entries filed in arrival + // order while sitting mid-history on the wire) was invisible in + // action + resetReason alone — it surfaced only as a canonical grown to + // 92 entries for an 84-message history. A state model drifting from the + // wire is the failure mode behind every reset class this extension has + // had, so the sizes belong in the telemetry tools/replay.mjs --trace + // reads. + ctx.meta.insertionNormalizeStats = { + action: result.action, + inserted: result.inserted ?? 0, + resetReason: result.resetReason, + canonSize: result.canonicalEntries?.length ?? 0, + canonLive: result.canonicalEntries?.filter((e) => !e.d).length ?? 0, + msgs: messages.length, + canonOrderViolation: result.canonOrderViolation ?? null, + // `suppressions` (not just the count) rides on the stats object — + // tools/replay.mjs's safety-gate exemption reads the incoming + // indices from here to declare them, the same way it already reads + // deferred-tool-rewrite's tool_addition shape. + ...(pin + ? { + pinned: result.pinned ?? 0, + dropped: result.dropped ?? 0, + suppressed: result.suppressed ?? 0, + suppressions: result.suppressions ?? [], + // `reserves` is the mirror of `suppressions` and rides for the + // same reason: a message we ADD is invisible to a check that + // only knows what CC sent, so the gates read the outgoing + // indices from the extension's own report rather than + // re-deriving "this one looks synthetic". + moved: result.moved ?? 0, + reserves: result.reserves ?? [], + } + : {}), + }; + + await appendTelemetry( + dir, + sessionKey, + { + ts: new Date().toISOString(), + key: sessionKey, + sid: sessionId, + action: result.action, + inserted: result.inserted ?? 0, + ...(result.resetReason ? { resetReason: result.resetReason } : {}), + ...(pin ? { pinned: result.pinned ?? 0, dropped: result.dropped ?? 0, suppressed: result.suppressed ?? 0, moved: result.moved ?? 0 } : {}), + }, + fs, + ); + + // One event line PER SUPPRESSION (not aggregated into the summary + // line above), to the same file/format — the pattern every other + // record in this log already uses, just one call per occurrence + // instead of once per request. + if (pin && Array.isArray(result.suppressions) && result.suppressions.length) { + for (const s of result.suppressions) { + await appendTelemetry( + dir, + sessionKey, + { + ts: new Date().toISOString(), + key: sessionKey, + sid: sessionId, + event: s.kind === "join-move" ? "join-move" : "suppressed-duplicate", + index: s.index, + hash: s.hash, + }, + fs, + ); + } + } + + if (isDebug()) { + process.stderr.write( + `[insertion-normalize] action=${result.action} inserted=${result.inserted ?? 0}` + + (result.resetReason ? ` reason=${result.resetReason}` : "") + + (pin ? ` pinned=${result.pinned ?? 0} dropped=${result.dropped ?? 0} suppressed=${result.suppressed ?? 0}` : "") + + "\n", + ); + } + } catch (err) { + debug(`onRequest unexpected: ${err?.message ?? err}`); + } + }, +}; diff --git a/proxy/extensions/message-hash.mjs b/proxy/extensions/message-hash.mjs new file mode 100644 index 00000000..db5fb65a --- /dev/null +++ b/proxy/extensions/message-hash.mjs @@ -0,0 +1,63 @@ +// message-hash — content identity for a message, shared by every extension +// that needs to recognise "the same message" across requests. +// +// Hash everything EXCEPT cache_control, because cache_control is what the +// proxy itself mutates: including it would make a message look changed the +// instant we mark it, which is the opposite of an identity. +// +// Not an extension — a primitive. It lived in mid-history-breakpoint-ladder +// until that extension was removed (it manufactured the mid-history +// divergences it was meant to bound); insertion-normalization and +// deferred-tool-rewrite both depend on this function and never depended on +// rung placement, so it moved here rather than dying with its old host. + +import { createHash } from "node:crypto"; + +export function hashMessageContent(msg) { + if (!msg || !Array.isArray(msg.content)) return null; + const stripped = msg.content.map((block) => { + if (!block || typeof block !== "object") return block; + const { cache_control, ...rest } = block; + return rest; + }); + return createHash("sha256").update(JSON.stringify(stripped)).digest("hex").slice(0, 16); +} + +// Conversation identity: the hash of msgs[0], the one entry nothing appends +// past. Lives here, not in one extension, because BOTH stateful extensions +// need it and the second one learning it late is what this file exists to +// prevent. +// +// History (2026-07-28, one day, twice). insertion-normalization keyed its +// canonical on (session-id, system-prompt) and thrashed: every subagent of a +// session runs the same agent prompt, so one bucket held 39 distinct +// conversations and 100% of conversation switches within a bucket reset +// (60/60) against 1% of same-conversation continuations. Adding this sub-key +// took it to 0 resets across 940 requests. +// +// deferred-tool-rewrite had the IDENTICAL key and did not get the fix, and it +// cost real cache: its tool_addition announcement is anchored to a message +// identity, so under a shared key the anchor belongs to somebody else's +// history, fails to match, and re-anchors to "after the last user message" — +// a different index every request. Measured: output diverging at index 4 +// while CC's own history was identical through index 23, twice in one corpus. +// +// The general rule this keeps re-teaching: an identity computed more cheaply +// than the thing it identifies will collide, and the collision presents as +// churn rather than as a bug. +export function conversationSubKey(messages) { + const first = Array.isArray(messages) ? messages[0] : null; + if (!first) return "empty"; + const h = hashMessageContent(first); + if (h) return h; + // hashMessageContent covers block-array content only and returns null for + // STRING content — correct for its own callers, but as a bucket key that + // null collapsed every string-content conversation into one shared "empty" + // bucket (56 of 602 requests in the measured capture). A message carrying + // no content at all is the only remaining "empty". + if (first.content === undefined || first.content === null) return "empty"; + return createHash("sha256") + .update(JSON.stringify({ role: first.role ?? null, content: first.content })) + .digest("hex") + .slice(0, 16); +} diff --git a/proxy/source-fingerprint.mjs b/proxy/source-fingerprint.mjs new file mode 100644 index 00000000..a4a0d8d2 --- /dev/null +++ b/proxy/source-fingerprint.mjs @@ -0,0 +1,80 @@ +// Fingerprint of the proxy's own source tree, computed once at startup and +// reported on /health as `proxy_tree`. +// +// Why this exists. Hot-reload is off, so the running process keeps whatever +// code it loaded at start; edit proxy/ without restarting and the repo checks +// pass while the traffic is served by something else. The dotfiles doctor +// asked that question by comparing the newest MTIME under proxy/ against the +// unit's start time, with a comment declaring the label to be the whole truth +// because "what the process holds in memory is not hashable". +// +// It is not the whole truth, and 2026-07-28 showed how: restoring a file from +// a backup after a bite test moved its mtime while leaving the bytes +// identical, and doctor reported "still running old code" about a proxy that +// was running exactly the code on disk. A checker that fires on a non-defect +// trains its reader to ignore it — the same fault, in the same repo, that the +// mtime comment was written to avoid. +// +// What the process holds is not hashable, but what it LOADED is: it can +// fingerprint its own source at startup and publish the result. Then doctor +// compares content to content, and mtime churn is silent by construction. +// +// The algorithm is deliberately dull, because a second implementation would +// have to match it: every regular file under the root except node_modules and +// dot-directories, relative POSIX paths sorted byte-wise, each contributing +// `path\n\n` to one running hash. Nothing here depends on +// filesystem order, mtimes, or inode numbers. +// +// There is no second implementation: doctor shells out to this file rather +// than mirroring it in Python. Two implementations of one hash is exactly the +// kind of duplication that drifts silently and reports a mismatch nobody can +// explain. + +import { createHash } from "node:crypto"; +import { readdir, readFile } from "node:fs/promises"; +import { join, relative, sep, dirname } from "node:path"; +import { fileURLToPath } from "node:url"; + +const SKIP_DIRS = new Set(["node_modules"]); + +async function collect(root, dir, out) { + const entries = await readdir(dir, { withFileTypes: true }); + for (const e of entries) { + if (e.name.startsWith(".")) continue; + const full = join(dir, e.name); + if (e.isDirectory()) { + if (SKIP_DIRS.has(e.name)) continue; + await collect(root, full, out); + } else if (e.isFile()) { + out.push(relative(root, full).split(sep).join("/")); + } + } + return out; +} + +export async function sourceFingerprint(root) { + const files = (await collect(root, root, [])).sort(); + const h = createHash("sha256"); + for (const rel of files) { + const bytes = await readFile(join(root, rel)); + h.update(rel); + h.update("\n"); + h.update(createHash("sha256").update(bytes).digest("hex")); + h.update("\n"); + } + return h.digest("hex").slice(0, 12); +} + +export const PROXY_ROOT = dirname(fileURLToPath(import.meta.url)); + +// `node proxy/source-fingerprint.mjs [root]` — the form doctor calls. +if (process.argv[1] && fileURLToPath(import.meta.url) === process.argv[1]) { + const root = process.argv[2] ?? PROXY_ROOT; + sourceFingerprint(root).then( + (fp) => process.stdout.write(fp + "\n"), + (err) => { + process.stderr.write(`source-fingerprint failed: ${err?.message ?? err}\n`); + process.exit(1); + }, + ); +} diff --git a/test/absence-scan.test.mjs b/test/absence-scan.test.mjs new file mode 100644 index 00000000..f566bb09 --- /dev/null +++ b/test/absence-scan.test.mjs @@ -0,0 +1,324 @@ +// absence-scan — the scanner's own bite. +// +// The classes it carries were extracted out of harvest-scrub-relations.test.mjs +// §6, where they assert the ABSENCE of a defect over a corpus that is clean. +// That shape cannot bite itself: a neutered predicate over a clean corpus still +// passes, so "the suite is green" says nothing about whether the extraction +// kept the classes alive. What proves a class alive is a SEEDED defect — one +// synthetic document per class, each of which must produce exactly its own +// finding. That is what the first section does, and it is the guarantee the +// extraction needed. +// +// The rest exercises the CLI contract the pre-push hook in the dotfiles repo +// depends on: exit 2 on findings, 0 on clean, the git-range mode over a real +// scratch repository, the allowlist, and the degraded (unparseable) path. +// +// Every identifier here is synthetic — this repo is public. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { spawnSync } from "node:child_process"; +import { mkdtempSync, mkdirSync, writeFileSync, rmSync, readdirSync, readFileSync } from "node:fs"; +import { tmpdir } from "node:os"; +import { join, dirname, sep } from "node:path"; +import { fileURLToPath } from "node:url"; + +import { scanDocument, scanContent, isAllowlisted, CLASSES } from "../tools/absence-scan.mjs"; + +const TOOL = join(dirname(fileURLToPath(import.meta.url)), "..", "tools", "absence-scan.mjs"); +const CORPUS = "test/fixtures/harvested"; + +// Synthetic, and shaped like the thing each class is defined against. +const FAKE_UUID = "0123abcd-4567-89ef-0123-456789abcdef"; +const LONG_B64 = "QUJDREVGR0hJSktMTU5PUFFSU1RVVldYWVphYmNkZWZnaGlqa2xtbm9wcXJzdHV2d3h5ejAxMjM0".repeat(4); +const TOKEN_TEXT = "t_0123456789ab_42"; + +// A document with nothing for any class to say anything about. +const CLEAN = { + key: "s-0123456789ab", + ts: "2000-01-01T00:00:03.000Z", + messages: [ + { role: "user", content: [{ type: "text", text: TOKEN_TEXT }] }, + { + role: "user", + content: [{ type: "image", source: { type: "base64", media_type: "image/png", data: "data_0123456789" } }], + }, + ], +}; + +// One seeded defect per class. Each entry is the MINIMAL deviation from CLEAN +// that its class is defined to catch. +const SEEDED = { + // On a `signature`, not on a `text`: a long base64 run inside a content + // field is legitimately BOTH an unsanitized payload and untokenized content, + // and a seed that trips two classes cannot show which one caught it. + "b64-run": { + ...CLEAN, + messages: [ + { role: "assistant", content: [{ type: "thinking", thinking: TOKEN_TEXT, signature: LONG_B64 }] }, + ], + }, + "nested-payload": { + ...CLEAN, + messages: [ + { role: "user", content: [{ type: "image", source: { type: "base64", data: "iVBORw0KGgoAAAA" } }] }, + ], + }, + "live-timestamp": { ...CLEAN, ts: "2026-08-01T09:15:00.000Z" }, + "capture-uuid": { ...CLEAN, key: FAKE_UUID }, + "raw-content": { + ...CLEAN, + messages: [{ role: "user", content: [{ type: "text", text: "plain prose that never went through the scrub" }] }], + }, +}; + +test("every class goes RED on its own seeded defect, and only that class", () => { + for (const cls of CLASSES) { + const doc = SEEDED[cls.name]; + assert.ok(doc, `no seeded defect for class ${cls.name} — a class without a bite is an orphan`); + const fired = new Set(scanDocument(doc).findings.map((f) => f.class)); + assert.ok(fired.has(cls.name), `${cls.name} did not fire on its own seeded defect`); + assert.deepEqual([...fired], [cls.name], `${cls.name}'s seeded defect must not trip a second class`); + } +}); + +test("the clean document produces no finding at all", () => { + assert.deepEqual(scanDocument(CLEAN).findings, []); +}); + +test("a finding never carries the matched bytes", () => { + // A leak reporter that prints the leak has moved it, not found it. + const findings = scanDocument(SEEDED["capture-uuid"]).findings; + assert.equal(findings.length, 1); + assert.deepEqual(Object.keys(findings[0]).sort(), ["class", "file", "length", "path"]); + assert.ok(!JSON.stringify(findings).includes(FAKE_UUID)); +}); + +test("the filename class fires on a UUID name and on an 8-hex s- prefix, not on the real token shape", () => { + const names = (n) => scanContent(JSON.stringify(CLEAN), `${CORPUS}/${n}`).findings.map((f) => f.class); + assert.deepEqual(names(`pinned-${FAKE_UUID}-26-28.json`), ["capture-uuid-filename"]); + assert.deepEqual(names("pinned-s-4b6a4352-26-28.json"), ["capture-uuid-filename"]); + assert.deepEqual(names("pinned-s-4b6a435234bf-26-28.json"), [], "12 hex after s- is the sanitized shape"); +}); + +test("classes defined over the harvested corpus do not fire outside it; byte-level classes do", () => { + // Measured basis (report absence-guard-report.md): the corpus-shape classes + // fired ~205 times on hand-authored synthetic proxy fixtures, none of which + // is a defect. The byte-level classes fired only on real leaks. + const outside = scanContent(JSON.stringify(SEEDED["raw-content"]), "test/fixtures/hand-written.json"); + assert.deepEqual(outside.findings, [], "prose in a hand-authored fixture is not a sanitization defect"); + assert.equal(outside.partial, true, "and the run must SAY it only half-checked"); + + const uuidOutside = scanContent(JSON.stringify(SEEDED["capture-uuid"]), "test/fixtures/hand-written.json"); + assert.deepEqual(uuidOutside.findings.map((f) => f.class), ["capture-uuid"], + "a live capture identifier needs no corpus to be one"); +}); + +test("an unparseable file is scanned as raw bytes and reported degraded, never skipped", () => { + const r = scanContent(`{ not json at all ${FAKE_UUID}`, `${CORPUS}/broken.json`); + assert.deepEqual(r.degraded, ["does not parse"]); + assert.deepEqual(r.findings.map((f) => f.class), ["capture-uuid"]); +}); + +test("the allowlist covers the LEDGER watermark file and nothing else in the corpus", () => { + assert.equal(isAllowlisted(`${CORPUS}/LEDGER-Siren.json`), true); + assert.equal(isAllowlisted(`${CORPUS}/pinned-s-4b6a435234bf-26-28.json`), false); +}); + +// --- CLI --------------------------------------------------------------------- + +const run = (args, cwd) => spawnSync(process.execPath, [TOOL, ...args], { cwd, encoding: "utf-8" }); + +function withTemp(fn) { + const dir = mkdtempSync(join(tmpdir(), "absence-scan-")); + try { + return fn(dir); + } finally { + rmSync(dir, { recursive: true, force: true }); + } +} + +function seedCorpusFile(dir, name, doc) { + mkdirSync(join(dir, CORPUS), { recursive: true }); + const rel = `${CORPUS}/${name}`; + writeFileSync(join(dir, rel), JSON.stringify(doc, null, 2)); + return rel; +} + +test("CLI: exit 2 on a file carrying a synthetic UUID, exit 0 on a clean one", () => { + withTemp((dir) => { + const dirty = seedCorpusFile(dir, "dirty.json", SEEDED["capture-uuid"]); + const bad = run([dirty], dir); + assert.equal(bad.status, 2, bad.stdout + bad.stderr); + assert.match(bad.stdout, /FINDING capture-uuid/); + assert.ok(!bad.stdout.includes(FAKE_UUID), "the CLI must not echo the matched bytes either"); + + const clean = seedCorpusFile(dir, "clean.json", CLEAN); + const ok = run([clean], dir); + assert.equal(ok.status, 0, ok.stdout + ok.stderr); + assert.match(ok.stdout, /absence-scan: clean/); + }); +}); + +test("CLI: an allowlisted path is reported, not scanned", () => { + withTemp((dir) => { + const led = seedCorpusFile(dir, "LEDGER-Testhost.json", SEEDED["capture-uuid"]); + const r = run([led], dir); + assert.equal(r.status, 0, r.stdout + r.stderr); + assert.match(r.stdout, /^allowlisted: /m); + assert.ok(!r.stdout.includes("FINDING")); + }); +}); + +test("CLI: no arguments is an internal-error exit, not a silent pass", () => { + const r = run([]); + assert.equal(r.status, 1); +}); + +// --- git range --------------------------------------------------------------- + +function gitRepo(dir) { + const g = (...args) => { + const r = spawnSync("git", args, { cwd: dir, encoding: "utf-8" }); + assert.equal(r.status, 0, `git ${args.join(" ")}: ${r.stderr}`); + return r.stdout.trim(); + }; + g("init", "-q", "-b", "main"); + g("config", "user.email", "t@t"); + g("config", "user.name", "t"); + return g; +} + +test("git-range: red on a defect added in the range, green on the range before it", () => { + withTemp((dir) => { + const g = gitRepo(dir); + const cleanRel = seedCorpusFile(dir, "clean.json", CLEAN); + g("add", cleanRel); + g("commit", "-qm", "clean"); + const first = g("rev-parse", "HEAD"); + + const dirtyRel = seedCorpusFile(dir, "dirty.json", SEEDED["capture-uuid"]); + g("add", dirtyRel); + g("commit", "-qm", "dirty"); + const second = g("rev-parse", "HEAD"); + + const red = run(["--git-range", `${first}..${second}`], dir); + assert.equal(red.status, 2, red.stdout + red.stderr); + assert.match(red.stdout, /FINDING capture-uuid {2}test\/fixtures\/harvested\/dirty\.json/); + assert.ok(!red.stdout.includes("clean.json"), "an unchanged file is outside the range"); + + const green = run(["--git-range", `EMPTY..${first}`], dir); + assert.equal(green.status, 0, green.stdout + green.stderr); + }); +}); + +test("git-range: EMPTY scans every file reachable at the new ref (the new-branch push)", () => { + withTemp((dir) => { + const g = gitRepo(dir); + const dirtyRel = seedCorpusFile(dir, "dirty.json", SEEDED["capture-uuid"]); + g("add", dirtyRel); + g("commit", "-qm", "dirty"); + const head = g("rev-parse", "HEAD"); + const r = run(["--git-range", `EMPTY..${head}`], dir); + assert.equal(r.status, 2, r.stdout + r.stderr); + }); +}); + +test("git-range: a deleted file is not scanned, and a non-JSON file is ignored", () => { + withTemp((dir) => { + const g = gitRepo(dir); + const dirtyRel = seedCorpusFile(dir, "dirty.json", SEEDED["capture-uuid"]); + writeFileSync(join(dir, "notes.md"), `not scanned ${FAKE_UUID}\n`); + g("add", dirtyRel, "notes.md"); + g("commit", "-qm", "dirty"); + const first = g("rev-parse", "HEAD"); + + rmSync(join(dir, dirtyRel)); + g("add", "-A"); + g("commit", "-qm", "removed"); + const second = g("rev-parse", "HEAD"); + + const r = run(["--git-range", `${first}..${second}`], dir); + assert.equal(r.status, 0, `${r.stdout}${r.stderr}`); + }); +}); + +test("git-range: an unresolvable base ref degrades to a full scan rather than erroring", () => { + withTemp((dir) => { + const g = gitRepo(dir); + const dirtyRel = seedCorpusFile(dir, "dirty.json", SEEDED["capture-uuid"]); + g("add", dirtyRel); + g("commit", "-qm", "dirty"); + const head = g("rev-parse", "HEAD"); + // A sha this clone has never seen — the shape of a remote ref that was + // never fetched. + const r = run(["--git-range", `0000000000000000000000000000000000000001..${head}`], dir); + assert.equal(r.status, 2, r.stdout + r.stderr); + assert.match(r.stdout, /^degraded: base ref /m); + }); +}); + +// ── Source files: a capture UUID may exist only on the allowlist ────────────── +// +// Fixtures are covered by the classes above; SOURCE leaks ride in comments and +// string literals instead (found live 2026-08-01: the same capture UUID in a +// test file's evidence comment and in tools/replay.mjs — public repo, +// unscrubbable history). A bare "no UUIDs in source" rule would fire on the +// synthetic ones, so the rule is: every UUID in test/, tools/, and proxy/ +// source is on the explicit synthetic allowlist below, or this test fails. A +// new legitimate synthetic is added HERE, deliberately, in the same diff a +// reviewer sees — never waved through. +// +// docs/ IS THE SAME SURFACE (widened 2026-08-01, BACKLOG "docs/ UUID triage"): +// a directive, a review or a release-test log is as public as a source file, +// and the same sweep found real capture keys and a session id sitting in four +// of them. Prose carries more legitimate synthetics than code does — hence the +// provenance line on each entry below. +const SOURCE_UUID_ALLOWLIST = new Set([ + FAKE_UUID, // this suite's seeded defect + "b16c607d-d484-4935-840e-e3f7ee78eb08", // proxy suites' synthetic session id + "00000000-0000-4000-8000-c4f1efb22220", // session-mirror synthetic + "9d1c250a-e61b-44d9-88ed-5944d1962f5e", // Anthropic's PUBLIC OAuth client_id + "1a6869d5-283e-43a3-9ba3-4495ceaa239a", // upstream docs/directives/proxy-cache-warmer-v3.7.0.md org_id example (upstream's own pre-existing content) + // docs/ synthetics, each a placeholder by construction: + "00000000-0000-4000-8000-c4f1efb22221", // release-test harness's pinned --session-id, sibling of ...22220 + "abcd1234-5678-90ab-cdef-1234567890ab", // the "e.g." 8-4-4-4-12 format sample in proxy-jsonl-session-mirror.md +]); + +test("source: every UUID in test/, tools/, proxy/ and docs/ is on the synthetic allowlist", () => { + const root = join(dirname(fileURLToPath(import.meta.url)), ".."); + const files = []; + const collect = (dir, ext) => { + for (const e of readdirSync(join(root, dir), { withFileTypes: true })) { + const rel = join(dir, e.name); + if (e.isDirectory()) { + // test/ and tools/ are flat; proxy/ and docs/ are not. + if (dir.startsWith("proxy") || dir.startsWith("docs")) collect(rel, ext); + continue; + } + if (e.name.endsWith(ext)) files.push(rel); + } + }; + collect("test", ".mjs"); + collect("tools", ".mjs"); + collect("proxy", ".mjs"); + collect("docs", ".md"); + // Guard the guard: a walk that collected nothing from a root would pass + // this test while checking that root not at all — the silent scope collapse + // a rename or a moved directory causes. + for (const root_ of ["test", "tools", "proxy", "docs"]) { + assert.ok(files.some((f) => f.startsWith(root_ + sep)), `the walk collected no file under ${root_}/`); + } + const uuidRe = /[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/g; + const offenders = []; + for (const rel of files) { + const text = readFileSync(join(root, rel), "utf8"); + for (const hit of text.match(uuidRe) ?? []) { + if (!SOURCE_UUID_ALLOWLIST.has(hit)) offenders.push(`${rel}: ${hit}`); + } + } + assert.deepEqual( + offenders, [], + `unlisted UUID(s) in source — a capture identifier in a public tree, or a new synthetic missing from the allowlist:\n${offenders.join("\n")}`, + ); +}); diff --git a/test/bust-triage-controlled.test.mjs b/test/bust-triage-controlled.test.mjs new file mode 100644 index 00000000..b526b7c2 --- /dev/null +++ b/test/bust-triage-controlled.test.mjs @@ -0,0 +1,96 @@ +// bust-triage must see every event the statusline shows. +// +// Definition, taken from the statusline rather than from this tool: the ❄ +// token advances on TWO paths in `claude-worktime` — `cold_hit`, written as +// k:"hit", and `cold_cost`, written as k:"cost" (plus legacy k:"resume" +// records, which its own `--cold --all` filter still lists). So the +// ❄-visible population is {hit, cost, resume}, and anything in it that +// `--list` cannot show is a blind spot by construction. +// +// The incident, 2026-07-31 ~13:53Z: the statusline showed `❄ 55k compact (8m)` +// (ledger k:"cost", t=1785505434) while `--list` showed nothing newer than +// 12:25 and the default run triaged an older, unrelated event without saying +// so. A controlled cost is not triageable — that is an ANSWER, and the +// three-answer rule is that it must be stated, never expressed as silence. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { writeFileSync, mkdtempSync } from "node:fs"; +import { tmpdir } from "node:os"; +import { join } from "node:path"; + +import { coldEvents, busts, listRows, fallbackNote } from "../tools/bust-triage.mjs"; + +function ledger(records) { + const d = mkdtempSync(join(tmpdir(), "bt-controlled-")); + const p = join(d, "activity.jsonl"); + writeFileSync(p, records.map((r) => JSON.stringify(r)).join("\n") + "\n"); + return p; +} + +const HIT = { type: "cold", k: "hit", t: 1000, s: "S1", cc: 40000, cause: "messages_changed" }; +const COST = { type: "cold", k: "cost", t: 2000, s: "S2", cc: 55000, cause: "compact" }; +const RESUME = { type: "cold", k: "resume", t: 1500, s: "S3", cc: 51000, + cause: "previous_message_not_found" }; + +test("a controlled cost event is in the ledger read, classified apart from busts", () => { + const events = coldEvents(ledger([HIT, RESUME, COST])); + assert.deepEqual(events.map((e) => e.t), [2000, 1500, 1000], "newest first"); + assert.deepEqual(events.map((e) => e.cls), ["controlled", "controlled", "bust"]); +}); + +test("busts() still means busts — the triageable population is unchanged", () => { + const b = busts(ledger([HIT, RESUME, COST])); + assert.equal(b.length, 1); + assert.equal(b[0].t, 1000); +}); + +test("BITE — a ❄-visible controlled event can never be absent from --list", () => { + const rows = listRows(coldEvents(ledger([HIT, COST]))); + assert.equal(rows.length, 2, "both events listed"); + assert.ok(rows[0].includes("CONTROLLED(compact)"), `controlled label missing: ${rows[0]}`); + assert.ok(rows[1].includes("messages_changed"), "the bust keeps its bare cause"); + assert.ok(!rows[1].includes("CONTROLLED"), "a bust must not be labelled controlled"); +}); + +test("legacy k:\"resume\" records are listed too — the statusline counts them", () => { + const rows = listRows(coldEvents(ledger([RESUME]))); + assert.equal(rows.length, 1); + assert.ok(rows[0].includes("CONTROLLED(previous_message_not_found)")); +}); + +test("BITE — when the newest event is controlled, the default run says so", () => { + const note = fallbackNote(coldEvents(ledger([HIT, COST]))); + assert.ok(note.length, "silence is not an answer"); + const text = note.join("\n"); + assert.match(text, /Cannot triage/i, "the non-verdict must be stated as one"); + assert.match(text, /CONTROLLED\(compact\)/); + assert.match(text, /Falling back/i, "and it must name what it triaged instead"); +}); + +test("no note when the newest event IS a bust — the tool is not chatty", () => { + // A note on every run is a note nobody reads; it fires only on substitution. + const newerHit = { ...HIT, t: 3000 }; + assert.deepEqual(fallbackNote(coldEvents(ledger([newerHit, COST]))), []); +}); + +test("a controlled ledger with no busts at all still reports the event", () => { + const events = coldEvents(ledger([COST])); + assert.equal(events.length, 1); + const text = fallbackNote(events).join("\n"); + assert.match(text, /No bust in the ledger to fall back to/i); +}); + +test("retraction and cause-upgrade markers are not themselves events", () => { + // hit-retract / hit-cause are bookkeeping, never ❄ tokens of their own. + const events = coldEvents(ledger([ + HIT, + { type: "cold", k: "hit-cause", hit_t: 1000, s: "S1", cause: "tools_changed" }, + { type: "cold", k: "hit", t: 1200, s: "S1", cc: 9000, cause: "idle" }, + { type: "cold", k: "hit-retract", hit_t: 1200, s: "S1" }, + { type: "cold", k: "gauge", t: 1300, s: "S1", met: 0 }, + { type: "cold", k: "warn", t: 1400, s: "S1", gap: 90 }, + ])); + assert.equal(events.length, 1, "one surviving event"); + assert.equal(events[0].cause, "tools_changed", "the late-bound cause wins"); +}); diff --git a/test/cache-sim.test.mjs b/test/cache-sim.test.mjs new file mode 100644 index 00000000..ee82c476 --- /dev/null +++ b/test/cache-sim.test.mjs @@ -0,0 +1,68 @@ +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { simulatePair } from "../tools/cache-sim.mjs"; + +const cc = { cache_control: { type: "ephemeral" } }; + +function msg(role, text, marked = false) { + return { + role, + content: [marked ? { type: "text", text, ...cc } : { type: "text", text }], + }; +} + +function body(messages, extra = {}) { + return { model: "claude-opus-5", system: [{ type: "text", text: "sys" }], messages, ...extra }; +} + +test("simulatePair: pure append after a marker hits up to that marker", () => { + const prev = body([msg("user", "a", true), msg("assistant", "b")]); + const now = body([msg("user", "a", true), msg("assistant", "b"), msg("user", "c")]); + const sim = simulatePair(prev, now); + assert.equal(sim.divergence, "append"); + assert.equal(sim.bestMarker, 0, "marker at index 0 survived"); + assert.ok(sim.hitTok > 0); + assert.ok(sim.writeTok < sim.totalTok); +}); + +test("simulatePair: front change (model) busts everything", () => { + const prev = body([msg("user", "a", true)]); + const now = body([msg("user", "a", true)], { model: "claude-sonnet-5" }); + const sim = simulatePair(prev, now); + assert.equal(sim.divergence, "front"); + assert.equal(sim.hitTok, 0); + assert.equal(sim.writeTok, sim.totalTok); +}); + +test("simulatePair: mid-history mutation falls back to the last marker BEFORE it", () => { + // Markers at 0 and 3 (prev tail); mutation at index 2 -> only marker 0 usable. + const mk = (midText) => [ + msg("user", "start", true), + msg("assistant", "t1"), + msg("user", midText), + msg("assistant", "t2", true), + ]; + const prev = body(mk("original")); + const now = body(mk("MUTATED")); + const sim = simulatePair(prev, now); + assert.equal(sim.divergence, "messages@2"); + assert.equal(sim.bestMarker, 0, "index-0 marker is the only one before the mutation"); +}); + +test("simulatePair: mutation before every marker leaves zero hit — the measured whole-context bust", () => { + // Marker only at prev tail (index 1); mutation at index 0. + const prev = body([msg("user", "orig"), msg("assistant", "t", true)]); + const now = body([msg("user", "CHANGED"), msg("assistant", "t", true)]); + const sim = simulatePair(prev, now); + assert.equal(sim.divergence, "messages@0"); + assert.equal(sim.hitTok, 0, "no marker precedes the divergence"); + assert.equal(sim.writeTok, sim.totalTok); +}); + +test("simulatePair: a marker moving between requests is not a content change", () => { + const prev = body([msg("user", "a", true), msg("assistant", "b")]); + const now = body([msg("user", "a"), msg("assistant", "b", true), msg("user", "c")]); + const sim = simulatePair(prev, now); + assert.equal(sim.divergence, "append", "cache_control stripped before comparison"); +}); diff --git a/test/census-block-migration.test.mjs b/test/census-block-migration.test.mjs new file mode 100644 index 00000000..5393244a --- /dev/null +++ b/test/census-block-migration.test.mjs @@ -0,0 +1,88 @@ +// blockMigration — the reminder-swap shape self-identifies. +// +// The census reduces messages to semantic hashes and, for a +// system-reminder-wrapped text block, drops it outright as decoration +// (semanticCore's isVolatileTextBlock) — correct when the reminder really is +// noise, and exactly what makes the census blind to the case where the same +// bytes are NOT noise: they leave one message's content array and reappear +// as a message of their own (measured directly in capture +// s-633915a8, n=26->28, message[30]'s 5th block +// -> the new message[31]). blockMigration is the check for that shape; see +// tools/replay.mjs for the DEFINITION comment above findBlockMigrations. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { findBlockMigrations } from "../tools/replay.mjs"; + +const text = (t) => ({ type: "text", text: t }); +const human = (t) => ({ role: "user", content: [text(t)] }); +const asst = (t) => ({ role: "assistant", content: [text(t)] }); + +// One capture entry as the replay loop builds it — same shape the other +// replay tests (replay-edit-anchor.test.mjs, replay-gate-selfcheck.test.mjs) +// pass to the checker functions, so findBlockMigrations's own asCompact call +// exercises the same compactEntry path production traffic goes through. +const conv = (msgs, n) => ({ n, ts: `t${n}`, key: "k", inMsgs: msgs, outMsgs: msgs, inTools: [], outTools: [] }); + +const REMINDER = "\nPreToolUse:Edit hook additional context: do the thing\n"; +const INNER = "PreToolUse:Edit hook additional context: do the thing"; + +test("BITE — a hook reminder detaching from its host message into a standalone message is annotated inline->standalone", () => { + // Real shape: a user message carries a tool-output block AND a + // -wrapped block; the next request drops the wrapped + // block from that message and adds a new standalone system message + // carrying the SAME bytes, wrapper stripped — exactly what + // PreToolUse:Edit's hook context does on the wire. + const prev = [human("q1"), asst("a1"), { role: "user", content: [text("tool output"), text(REMINDER)] }, asst("a2")]; + const cur = [ + human("q1"), + asst("a1"), + { role: "user", content: [text("tool output")] }, + { role: "system", content: INNER }, + asst("a2"), + ]; + const rows = findBlockMigrations([conv(prev, 0), conv(cur, 1)]); + assert.equal(rows.length, 1); + assert.equal(rows[0].direction, "inline->standalone"); + assert.equal(rows[0].sourceIdx, 2, "the block's index in the message array where it was embedded"); + assert.equal(rows[0].targetIdx, 3, "the index of the new standalone message carrying the same bytes"); + assert.equal(rows[0].n, 1); + assert.equal(rows[0].prevN, 0); +}); + +test("fires-on-non-defect guard: a genuinely NOVEL inserted message is not annotated", () => { + // Same splice/insert-mid shape (a new message lands mid-history, later + // messages shift by one) but the inserted content has no counterpart + // anywhere in the predecessor — nothing migrated, something new arrived. + // A detector that fires here would train its reader to ignore the class. + const prev = [human("q1"), asst("a1"), { role: "user", content: [text("tool output")] }, asst("a2")]; + const cur = [ + human("q1"), + asst("a1"), + { role: "user", content: [text("tool output")] }, + { role: "system", content: "totally novel content with no counterpart in prev, never existed before" }, + asst("a2"), + ]; + const rows = findBlockMigrations([conv(prev, 0), conv(cur, 1)]); + assert.equal(rows.length, 0); +}); + +test("a block still present at the SAME position on the other side is not a migration", () => { + // Sanity companion to the guard above: the reminder block is untouched, + // sitting at the identical index on both sides — an unrelated insertion + // elsewhere forces the pair to splice/insert-mid so the scan actually + // runs; asserting 0 here would be trivial if the pair were "identical" + // (skipped by the kind filter before the scan ever executes). + const reminderMsg = { role: "user", content: [text("tool output"), text(REMINDER)] }; + const prev = [human("q1"), asst("a1"), reminderMsg, asst("a2")]; + const cur = [ + human("q1"), + asst("a1"), + reminderMsg, + { role: "system", content: "unrelated novel content, forces splice/insert-mid" }, + asst("a2"), + ]; + const rows = findBlockMigrations([conv(prev, 0), conv(cur, 1)]); + assert.equal(rows.length, 0); +}); diff --git a/test/census-byte-gate-sweep.test.mjs b/test/census-byte-gate-sweep.test.mjs new file mode 100644 index 00000000..de50b1c1 --- /dev/null +++ b/test/census-byte-gate-sweep.test.mjs @@ -0,0 +1,101 @@ +// The byte-gate riding the daily sweep: what it may and may not turn into a +// failing row. +// +// Definitions this pins, and the split between them is the whole point: +// +// COVERAGE is the sweep's business. The migration byte-test is the gate +// "every NORMALIZATION design must pass" (dev-loop.md), and its measured +// failure mode was reporting clean over captures it never read — 79% of the +// corpus by bytes. So a capture the byte-gate could not read, or a byte-gate +// run that produced no verdict at all, makes the row NOT clean. +// +// FINDINGS are not. A MISMATCH, an EXTENDED, an INTERIOR-DIVERGENT prune are +// facts about Claude Code's traffic, not defects of this pipeline. Failing +// the sweep on them would fire on non-defects daily and train its reader to +// ignore red — the failure `gate 1` in output-guard.test.mjs and the safety +// gate's 243 "corruptions" both already demonstrated here. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { summarise, rowIsClean, summariseCensus, censusArgs, describeByteGate, + CHILD_HEAP_CAP_MB } from "../tools/gate-live.mjs"; + +const json = (o) => ({ code: 0, out: JSON.stringify(o), err: "" }); + +/** A replay row with nothing wrong with it, so byteGate decides the verdict. */ +const cleanRow = () => summarise("c.jsonl", 100, json({ + report: [{ n: 0 }, { n: 1 }], + violations: [], safety: [], sequence: [], orderViolations: [], + census: { pairs: 2 }, +})); + +const censusJson = (o) => json({ + tally: { EXACT: 0, EXTENDED: 0, DROPPED: 0, MISMATCH: 0 }, + extendedSub: { "MERGED-STANDALONE": 0, "NEW-TEXT": 0 }, + prunes: { pure: 0, interior: 0, unanchored: 0 }, + pairs: 10, considered: 1, unreadable: [], ...o, +}); + +test("summariseCensus carries the tallies the sweep is supposed to surface", () => { + const g = summariseCensus(censusJson({ + tally: { EXACT: 3, EXTENDED: 2, DROPPED: 0, MISMATCH: 1 }, + extendedSub: { "MERGED-STANDALONE": 2, "NEW-TEXT": 0 }, + prunes: { pure: 11, interior: 1, unanchored: 0 }, + })); + assert.equal(g.tally.MISMATCH, 1); + assert.equal(g.extendedSub["MERGED-STANDALONE"], 2); + assert.equal(g.prunes.interior, 1); + assert.equal(g.unreadable, 0); +}); + +test("BITE — a capture the byte-gate could not READ fails the row", () => { + // The defect this sweep now has to catch: a normalization gate reporting a + // clean verdict over a corpus it never opened. + const row = cleanRow(); + assert.equal(rowIsClean(row), true, "the row is otherwise clean"); + row.byteGate = summariseCensus(censusJson({ + unreadable: [{ path: "/big.jsonl", error: "Cannot create a string longer than 0x1fffffe8 characters" }], + })); + assert.equal(row.byteGate.unreadable, 1); + assert.equal(rowIsClean(row), false, "unread bytes are a could-not-verify, not a pass"); + assert.match(describeByteGate(row.byteGate), /COULD NOT READ/); +}); + +test("BITE — a byte-gate run that produced no verdict fails the row", () => { + const row = cleanRow(); + row.byteGate = summariseCensus({ code: 1, out: "", err: "RangeError: something\n at x" }); + assert.ok(row.byteGate.error, "no JSON means no answer"); + assert.equal(rowIsClean(row), false); + assert.match(describeByteGate(row.byteGate), /COULD NOT RUN/); +}); + +test("findings are CARRIED, not failed — a MISMATCH is not a sweep failure", () => { + // A check that fires on a non-defect is broken too. MISMATCH blocks shipping + // a normalization; it does not mean today's traffic was mishandled. + const row = cleanRow(); + row.byteGate = summariseCensus(censusJson({ + tally: { EXACT: 5, EXTENDED: 1, DROPPED: 0, MISMATCH: 2 }, + prunes: { pure: 3, interior: 4, unanchored: 1 }, + })); + assert.equal(rowIsClean(row), true, "findings about CC's traffic stay findings"); + const line = describeByteGate(row.byteGate); + assert.match(line, /2 MISMATCH/, "but they must be VISIBLE in the sweep output"); + assert.match(line, /4 interior/); + assert.match(line, /1 unanchored/); +}); + +test("a row with no byte-gate at all is unchanged", () => { + // Backward compatibility with rows built before this rode along: absence of + // the field must not silently fail every historical row. + assert.equal(rowIsClean(cleanRow()), true); +}); + +test("the byte-gate child runs under the same heap cap as the replay child", () => { + // The cap is a CHECK, not a tuning knob: a census that regressed into + // retaining its input dies against it instead of OOMing years later. + const args = censusArgs("/c.jsonl"); + assert.equal(args[0], `--max-old-space-size=${CHILD_HEAP_CAP_MB}`); + assert.ok(args.includes("--json"), "the sweep parses JSON, never prose"); + assert.ok(args.some((a) => a.endsWith("reminder-migration-census.mjs"))); +}); diff --git a/test/census-dup-request.test.mjs b/test/census-dup-request.test.mjs new file mode 100644 index 00000000..0a0128f7 --- /dev/null +++ b/test/census-dup-request.test.mjs @@ -0,0 +1,98 @@ +// census-dup-request — the CC#78420 falsifier, mechanized (BACKLOG.md +// "Duplicate-request probe -> census check (Q1)"). +// +// The threat-matrix coverage note ("hidden duplicate request", #78420) was +// answered 2026-07-29 by a throwaway python scan over raw capture bytes — +// exactly the shape dev-loop.md calls out as the tell that a classification +// is missing from the tools. findDuplicateRequests re-answers the same +// question on every --census run instead of re-deriving it by hand. +// +// Also covers BACKLOG's "Row 6's isolating query is built and unread (Q3)": +// gate-live's status row now carries a toolsDeltas summary so the daily +// sweep's answer to threat-matrix row 6 is readable off the status file +// instead of re-run by hand. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { findDuplicateRequests } from "../tools/replay.mjs"; +import { summarise } from "../tools/gate-live.mjs"; + +const text = (t) => ({ type: "text", text: t }); +const human = (t) => ({ role: "user", content: [text(t)] }); +const asst = (t) => ({ role: "assistant", content: [text(t)] }); + +// One capture entry as the replay loop builds it — same shape +// census-block-migration.test.mjs and replay-gate-selfcheck.test.mjs pass to +// checker functions, so findDuplicateRequests' own asCompact call exercises +// the real compactEntry path. +const conv = (msgs, n) => ({ n, ts: `t${n}`, key: "k", inMsgs: msgs, outMsgs: msgs, inTools: [], outTools: [] }); + +test("BITE — adjacent byte-identical request bodies are counted as a duplicate", () => { + const msgs = [human("q1"), asst("a1"), human("q2")]; + const a = conv(msgs, 0); + // A genuine resend: the exact same message array crosses the wire twice. + const b = conv(structuredClone(msgs), 1); + const rows = findDuplicateRequests([a, b]); + assert.equal(rows.length, 1, "an unchanged history across adjacent requests is a resend"); + assert.equal(rows[0].n, 1); + assert.equal(rows[0].prevN, 0); + assert.equal(rows[0].msgs, 3); +}); + +test("a normal turn (history grows) is NOT counted", () => { + const a = conv([human("q1"), asst("a1")], 0); + const b = conv([human("q1"), asst("a1"), human("q2")], 1); + assert.equal(findDuplicateRequests([a, b]).length, 0, "every real turn changes something"); +}); + +test("a mid-history edit (same length, different bytes) is NOT counted", () => { + const a = conv([human("q1"), asst("a1"), human("q2")], 0); + const b = conv([human("q1 EDITED"), asst("a1"), human("q2")], 1); + assert.equal(findDuplicateRequests([a, b]).length, 0, "same length is not the same bytes"); +}); + +test("NON-adjacent identical bodies (identical to n-2, not n-1) are not counted", () => { + const msgs = [human("q1"), asst("a1")]; + const a = conv(structuredClone(msgs), 0); + const b = conv([human("q1"), asst("a1"), human("q2")], 1); + // c repeats a's exact bytes, but its ADJACENT predecessor is b, not a. + const c = conv(structuredClone(msgs), 2); + const rows = findDuplicateRequests([a, b, c]); + assert.equal(rows.length, 0, "duplicate detection is pairwise-adjacent, never a lookback"); +}); + +test("empty message arrays never count as a duplicate", () => { + const a = conv([], 0); + const b = conv([], 1); + assert.equal(findDuplicateRequests([a, b]).length, 0, "no content sent is not a resend of content"); +}); + +// --- gate-live: threat-matrix row 6's consumer path (BACKLOG Q3) --- + +const json = (o) => ({ code: 0, out: JSON.stringify(o), err: "" }); + +test("BITE — a fixture row with census toolsDeltas present lands a compact summary in the status row", () => { + const row = summarise("c.jsonl", 10, json({ + report: [{ n: 0 }, { n: 1 }, { n: 2 }], + violations: [], safety: [], sequence: [], orderViolations: [], + census: { pairs: 2 }, + toolsDeltas: [ + { n: 1, prevN: 0, kind: "reorder", msgKind: "identical", toolsOnly: true, forwardedStable: true }, + { n: 2, prevN: 1, kind: "membership+", msgKind: "append-only", toolsOnly: false, forwardedStable: false }, + ], + })); + assert.ok(row.toolsDeltas, "toolsDeltas summary must ride the status row"); + assert.equal(row.toolsDeltas.count, 2); + assert.equal(row.toolsDeltas.toolsOnly, 1, "row 6's isolating case: tools moved, messages did not"); + assert.equal(row.toolsDeltas.forwardedStable, 1); + assert.equal(row.toolsDeltas.leaked, 1); +}); + +test("no toolsDeltas in the parsed output (older replay, or census off) leaves the field absent, not zeroed", () => { + const row = summarise("c.jsonl", 10, json({ + report: [{ n: 0 }], + violations: [], safety: [], sequence: [], orderViolations: [], + })); + assert.equal(row.toolsDeltas, undefined, "absence must not be dressed up as a zeroed clean summary"); +}); diff --git a/test/census-extended-subclass.test.mjs b/test/census-extended-subclass.test.mjs new file mode 100644 index 00000000..648ffb60 --- /dev/null +++ b/test/census-extended-subclass.test.mjs @@ -0,0 +1,101 @@ +// EXTENDED is two different phenomena, and only one of them is new information. +// +// Definition, written before the assertions (dev-loop.md, "Adding a check"): +// an EXTENDED finding is one where CC's later standalone message carries the +// canonical reconstruction as a strict PREFIX. Its remainder — everything +// after that prefix, with the joining "\n\n" removed — is +// +// MERGED-STANDALONE byte-identical to the text of a standalone role:"system" +// message the BEFORE request ALREADY carried. CC merged an +// existing message into the migrated one; nothing new +// crossed the wire, so the later form is computable from +// the predecessor alone. +// NEW-TEXT matches no such message: content that did not exist at +// the earlier request. +// +// The distinction is what decides a mitigation, and it was hand-derived once +// already (docs/code-reviews/extended-absorb-report.md §b1: 9 of 9 EXTENDED +// occurrences in the readable corpus were merged standalones, 0 genuinely new +// text) — a hand-classification the tool did not carry, so the next session +// would have re-derived it. +// +// Fixtures are synthetic because a unit test wants a minimal pair it fully +// controls — not because the class cannot be harvested. It can, as of bffcb05 +// (same day): the scrub is a "\n\n"-homomorphism now, so the prefix/join +// relation that DEFINES this class survives sanitization. Executed against the +// shipped `scrubMessage` rather than read from its diff — scrub(a+"\n\n"+b) +// === scrub(a)+"\n\n"+scrub(b), and this file's own `subclassifyExtended` +// returns MERGED-STANDALONE on the scrubbed bytes. An earlier revision of this +// comment said the opposite, from report §c5, which was true when it was +// written and had already been fixed when this landed. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { mkdtempSync, writeFileSync } from "node:fs"; +import { tmpdir } from "node:os"; +import { join } from "node:path"; + +import { census } from "../tools/reminder-migration-census.mjs"; + +const REM = (t) => `\n${t}\n`; +const host = (id, reminders) => ({ + role: "user", + content: [{ type: "tool_result", tool_use_id: id, content: "ok" }, + ...reminders.map((t) => ({ type: "text", text: REM(t) }))], +}); +const plain = (role, text) => ({ role, content: [{ type: "text", text }] }); +const rec = (ts, messages) => JSON.stringify({ ts, body: { messages } }); + +/** One capture holding exactly one same-conversation pair. */ +async function pairCensus(beforeMsgs, afterMsgs) { + const dir = mkdtempSync(join(tmpdir(), "census-ext-")); + const p = join(dir, "s-x-requests.jsonl"); + writeFileSync(p, [rec("2026-07-31T10:00:00.000Z", beforeMsgs), + rec("2026-07-31T10:00:05.000Z", afterMsgs)].join("\n") + "\n"); + return census([p]); +} + +const anchor = plain("user", "the conversation's first message"); + +test("EXTENDED whose remainder the predecessor already sent is MERGED-STANDALONE", async () => { + const r = await pairCensus( + [anchor, host("tu_1", ["R1"]), plain("system", "S1")], + [anchor, host("tu_1", []), plain("system", "R1\n\nS1")], + ); + assert.equal(r.tally.EXTENDED, 1); + const d = r.details.find((x) => x.verdict === "EXTENDED"); + assert.equal(d.sub, "MERGED-STANDALONE"); +}); + +test("EXTENDED whose remainder is nowhere in the predecessor is NEW-TEXT", async () => { + const r = await pairCensus( + [anchor, host("tu_1", ["R1"])], + [anchor, host("tu_1", []), plain("system", "R1\n\nnever sent before")], + ); + assert.equal(r.tally.EXTENDED, 1); + const d = r.details.find((x) => x.verdict === "EXTENDED"); + assert.equal(d.sub, "NEW-TEXT"); +}); + +test("a remainder that only the LATER request carries is NEW-TEXT, not merged", async () => { + // The absorbable claim is about information the predecessor ALREADY sent. + // Matching against the after request's own standalones would make every + // merge trivially true — the message being classified is one of them. + const r = await pairCensus( + [anchor, host("tu_1", ["R1"])], + [anchor, host("tu_1", []), plain("system", "R1\n\nS-late"), plain("system", "S-late")], + ); + const d = r.details.find((x) => x.verdict === "EXTENDED"); + assert.equal(d.sub, "NEW-TEXT"); +}); + +test("an EXACT migration carries no sub-verdict", async () => { + // The annotation belongs to EXTENDED alone; a sub-verdict on an EXACT row + // would put a second, unearned claim into the absorbable population. + const r = await pairCensus( + [anchor, host("tu_1", ["R1"])], + [anchor, host("tu_1", []), plain("system", "R1")], + ); + assert.equal(r.tally.EXACT, 1); + assert.equal(r.details[0].sub, null); +}); diff --git a/test/census-output-hash.test.mjs b/test/census-output-hash.test.mjs new file mode 100644 index 00000000..2e0483d5 --- /dev/null +++ b/test/census-output-hash.test.mjs @@ -0,0 +1,111 @@ +// census-output-hash — unit bites for the outHashSem strip added to +// findMitigationGaps' outputForm/outputPreserved/rebilledOutBytes. +// BACKLOG.md: "READY — census outputForm hashes must strip cache_control +// (mirror the input side)." +// +// DEFINITION under test (stated before the assertions, per dev-loop.md's +// "Adding a check" — a bite's expected value comes from the invariant's +// DEFINITION, never from the implementation): cache_control designates a +// cache breakpoint, it is not conversation content. A pair of forwarded +// messages that differ ONLY in whether/where a cache_control block is +// attached is not a content splice — the model-visible bytes are +// identical, only the cache metadata moved. A pair that differs in actual +// TEXT is a real edit regardless of any cache_control noise riding along, +// and must still be caught (a checker that stops firing on the marker +// case must not also stop firing on the real one — the "fires on a +// non-defect" and "misses a real defect" failures are both broken the +// same way, dev-loop.md). +// +// These are unit-level bites on findMitigationGaps directly (synthetic +// entries), the small-corpus sibling of the real-capture assertions in +// test/mitigation-output-form.test.mjs. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { findMitigationGaps } from "../tools/replay.mjs"; + +const user = (t) => ({ role: "user", content: [{ type: "text", text: t }] }); +const asst = (t) => ({ role: "assistant", content: [{ type: "text", text: t }] }); + +// One capture entry in the pre-compactEntry shape findMitigationGaps' +// caller (asCompact) accepts — same shape test/mitigation-output-form.test.mjs +// uses. +const entry = (n, inMsgs, outMsgs, extra = {}) => ({ + n, + ts: `2026-07-30T00:00:${String(n).padStart(2, "0")}Z`, + key: "k", + inMsgs, + outMsgs, + action: null, + resetReason: null, + ...extra, +}); + +// --- red-first observation (recorded, not re-asserted): before the strip +// existed, this exact scenario ran through unpatched findMitigationGaps +// (outHash built from raw JSON.stringify(message), no cache_control strip) +// and returned outputForm: "edit@1", outputPreserved: false, +// rebilledOutBytes: 24 (the tail-only bytes) — the marker relocation read +// as a content splice. Observed by running this file against the +// pre-fix tree (git stash the outHashSem change, `node --test +// test/census-output-hash.test.mjs`): AssertionError, actual "edit@1" !== +// "append". That is the real defect this bite targets. + +test("census output-hash: a cache_control-only relocation is not a splice (preserved)", () => { + // message index 1 carries a cache_control breakpoint while it is the + // tail in prevOut; curOut carries the SAME text at the same position + // with no cache_control (the breakpoint moved off because the + // conversation grew past it — the flap-probe's measured shape, + // capture s-633915a8, n=678->681: identical 32,140-char text sent with + // a cache_control block while tail, then as a bare string once it + // wasn't) and one genuinely new message appended at the tail. + const withMarker = { + role: "user", + content: [{ type: "text", text: "u1", cache_control: { type: "ephemeral", ttl: "1h" } }], + }; + const withoutMarker = { role: "user", content: [{ type: "text", text: "u1" }] }; + + const prevIn = [user("u0"), asst("a0"), user("u1")]; + const curIn = [user("u0"), asst("a0"), user("SPLICED"), user("u1")]; + const prevOut = [user("u0"), asst("a0"), withMarker]; + const curOut = [user("u0"), asst("a0"), withoutMarker, user("u2-new")]; + + const rows = findMitigationGaps([ + entry(0, prevIn, prevOut, { action: "append-only" }), + entry(1, curIn, curOut, { action: "normalized" }), + ]); + + assert.equal(rows.length, 1); + assert.equal(rows[0].kind, "splice/insert-mid", "input-side classification is unchanged"); + assert.equal(rows[0].outputForm, "append", "marker-only delta must not read as a splice/edit"); + assert.equal(rows[0].outputPreserved, true); + assert.equal(rows[0].rebilledOutBytes, 0); +}); + +test("census output-hash: a real text delta beside a cache_control change is still caught", () => { + // Same shape as above, but message index 1's TEXT also changes, not + // just its cache_control. The checker must still fire — stripping + // cache_control must not also blind it to a genuine edit riding + // alongside one. + const withMarker = { + role: "user", + content: [{ type: "text", text: "u1", cache_control: { type: "ephemeral", ttl: "1h" } }], + }; + const editedNoMarker = { role: "user", content: [{ type: "text", text: "u1-EDITED" }] }; + + const prevIn = [user("u0"), asst("a0"), user("u1")]; + const curIn = [user("u0"), asst("a0"), user("SPLICED"), user("u1")]; + const prevOut = [user("u0"), asst("a0"), withMarker]; + const curOut = [user("u0"), asst("a0"), editedNoMarker, user("u2-new")]; + + const rows = findMitigationGaps([ + entry(0, prevIn, prevOut, { action: "append-only" }), + entry(1, curIn, curOut, { action: "normalized" }), + ]); + + assert.equal(rows.length, 1); + assert.notEqual(rows[0].outputForm, "append", "a genuine text edit must still be flagged"); + assert.equal(rows[0].outputPreserved, false); + assert.ok(rows[0].rebilledOutBytes > 0); +}); diff --git a/test/census-prune-classification.test.mjs b/test/census-prune-classification.test.mjs new file mode 100644 index 00000000..0112bf4a --- /dev/null +++ b/test/census-prune-classification.test.mjs @@ -0,0 +1,93 @@ +// Prune events: what a dropped message costs, and where the boundary sits. +// +// Definition, written before the assertions. A PRUNE is a same-conversation +// pair whose message count DECREASED. Its cost is positional — the API keys on +// the longest identical PREFIX — so the only question is where the prefix +// breaks relative to the LIVE TURN (the last human-typed message): +// +// PURE-TAIL-PRUNE nothing retained changed, or the first change sits at +// or after the live turn. The turn the user is producing +// is re-sent by every request anyway, so a prune +// confined to it invalidates nothing settled. +// INTERIOR-DIVERGENT the first change sits BEFORE the live turn: settled +// history moved and everything from there re-bills. +// UNANCHORED no human-typed message in the later array, so "live +// turn" has no referent and neither verdict is earned. +// +// The boundary is the anchor and NOT a distance, and that is the load-bearing +// choice: on the live corpus the same phenomenon (CC pruning a +// `[SUGGESTION MODE: …]` scaffolding block when the user actually types) +// produces live turns of one, two and three messages, and any +// message-count threshold splits identical events across the two verdicts. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { classifyPrune } from "../tools/reminder-migration-census.mjs"; + +/** A human-typed turn: user role, plain text, no leading "<" tag. */ +const human = (t) => ({ role: "user", content: [{ type: "text", text: t }] }); +/** A tool result: user role, never a human turn. */ +const tool = (t) => ({ role: "user", content: [{ type: "tool_result", content: t }] }); +const asst = (t) => ({ role: "assistant", content: [{ type: "text", text: t }] }); +/** CC's injected scaffolding turn — tagged, so isHumanTurn rejects it. */ +const suggestion = () => ({ role: "user", content: [{ type: "text", text: "" }] }); + +test("a drop whose retained prefix is byte-identical costs nothing", () => { + const before = [human("start"), tool("a"), tool("b")]; + const after = [human("start"), tool("a")]; + const p = classifyPrune(before, after); + assert.equal(p.kind, "PURE-TAIL-PRUNE"); + assert.equal(p.div, null, "no retained index differs at all"); + assert.equal(p.rebilled, 0); +}); + +test("scaffolding replaced by the real turn is a PURE tail prune", () => { + // The row-22 shape: CC injected a suggestion block, the user typed, CC + // pruned the block and the real message landed at the same index. + const before = [human("start"), tool("a"), suggestion(), asst("suggested"), tool("s")]; + const after = [human("start"), tool("a"), human("what the user really typed")]; + const p = classifyPrune(before, after); + assert.equal(p.kind, "PURE-TAIL-PRUNE"); + assert.equal(p.div, 2, "the break is at the live turn"); + assert.equal(p.anchor, 2); +}); + +test("the verdict does not depend on how long the live turn has grown", () => { + // Measured pair of live events this pins: 2026-07-31 11:45:03 (live turn of + // two messages) and 11:31:58 (three) are the same phenomenon, and a + // "within N of the tail" threshold classifies them differently. The anchor + // does not, so both must come back PURE. + const before = [human("start"), tool("a"), suggestion(), asst("s1"), tool("s2"), asst("s3")]; + const short = [human("start"), tool("a"), human("typed"), asst("reply")]; + const long = [human("start"), tool("a"), human("typed"), asst("reply"), tool("r")]; + + assert.equal(classifyPrune(before, short).kind, "PURE-TAIL-PRUNE"); + assert.equal(classifyPrune(before, long).kind, "PURE-TAIL-PRUNE"); + assert.equal(classifyPrune(before, short).rebilled, 2, "magnitude still reported"); + assert.equal(classifyPrune(before, long).rebilled, 3); +}); + +test("a change BEFORE the live turn is interior, and carries its magnitude", () => { + const before = [human("start"), tool("a"), tool("b"), tool("c"), human("live")]; + const after = [human("start"), tool("CHANGED"), tool("c"), human("live")]; + const p = classifyPrune(before, after); + assert.equal(p.kind, "INTERIOR-DIVERGENT"); + assert.equal(p.div, 1); + assert.equal(p.anchor, 3); + assert.equal(p.rebilled, 3, "everything from the break re-bills"); +}); + +test("a drop with no human turn is UNANCHORED, not PURE by default", () => { + // Answering PURE here would be a verdict without a basis: with no live turn + // there is nothing to place the divergence against. + const p = classifyPrune([tool("a"), tool("b"), tool("c")], [tool("a"), tool("ZZ")]); + assert.equal(p.kind, "UNANCHORED"); + assert.equal(p.anchor, null); +}); + +test("only a shrinking array is a prune", () => { + const a = [human("x"), tool("y")]; + assert.equal(classifyPrune(a, [...a, tool("z")]), null, "growth is not a prune"); + assert.equal(classifyPrune(a, [human("x"), tool("CHANGED")]), null, "equal length is not a prune"); +}); diff --git a/test/census-read-coverage.test.mjs b/test/census-read-coverage.test.mjs new file mode 100644 index 00000000..a1395687 --- /dev/null +++ b/test/census-read-coverage.test.mjs @@ -0,0 +1,91 @@ +// The census's READ, as a coverage claim rather than a silent best effort. +// +// The defect these pin (measured 2026-07-31 over the live corpus): `census()` +// slurped every capture with readFileSync and swallowed the failure, so the +// four largest captures — 6.2 GB of 7.8 GB, 79% of the corpus by bytes — fell +// out of every verdict this "gate every NORMALIZATION must pass" ever +// produced, reported as "25 capture(s)" with no could-not-verify line. +// +// Two properties, and the split is deliberate. The MECHANISM (a read failure +// is named, never counted as zero findings) is what a fixture can pin, and it +// is what these tests assert. The SCALE trigger — a >512 MB capture, the +// RangeError itself — cannot live in a committed fixture at all: harvest +// curates for structural novelty, so the corpus is small by construction and +// blind along exactly that axis (dev-loop.md, "the corpus is blind along its +// own curation axis"). That half is verified by running the tool over the live +// captures, and only there. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { mkdtempSync, writeFileSync } from "node:fs"; +import { tmpdir } from "node:os"; +import { join } from "node:path"; + +import { census } from "../tools/reminder-migration-census.mjs"; + +const REM = (t) => `\n${t}\n`; + +/** A host message: leading tool_result + trailing wrapped reminder blocks. */ +const host = (id, reminders) => ({ + role: "user", + content: [{ type: "tool_result", tool_use_id: id, content: "ok" }, + ...reminders.map((t) => ({ type: "text", text: REM(t) }))], +}); +const plain = (role, text) => ({ role, content: [{ type: "text", text }] }); +const rec = (ts, messages) => JSON.stringify({ ts, body: { messages } }); + +function capture(lines) { + const dir = mkdtempSync(join(tmpdir(), "census-read-")); + const p = join(dir, "s-x-requests.jsonl"); + writeFileSync(p, lines.join("\n") + "\n"); + return p; +} + +test("a capture that cannot be read is NAMED, not counted as zero findings", async () => { + const missing = join(tmpdir(), "census-read-does-not-exist", "s-nope-requests.jsonl"); + const r = await census([missing]); + + assert.equal(r.considered, 1, "the file must be counted in the denominator"); + assert.equal(r.unreadable.length, 1, "an unreadable capture is its own answer"); + assert.equal(r.unreadable[0].path, missing); + assert.match(r.unreadable[0].error, /ENOENT|no such file/i, "the reason must survive"); + assert.equal(r.captures, 0, "an unread file cannot be counted as read"); +}); + +test("an unreadable capture does not suppress the findings of a readable one", async () => { + // A mixed run is the live shape: the verdict must carry BOTH the numbers it + // measured and the population it could not measure. Reporting one without + // the other is the absence-wearing-a-verdict's-clothes failure. + const good = capture([ + rec("2026-07-31T10:00:00.000Z", [plain("user", "hi"), host("tu_1", ["R1"])]), + rec("2026-07-31T10:00:10.000Z", [plain("user", "hi"), host("tu_1", []), plain("system", "R1")]), + ]); + const r = await census([join(tmpdir(), "nope", "gone.jsonl"), good]); + + assert.equal(r.considered, 2); + assert.equal(r.unreadable.length, 1); + assert.equal(r.tally.EXACT, 1, "the readable capture's migration is still measured"); + assert.equal(r.pairs, 1); +}); + +test("grouping stays per-conversation when the read is line by line", async () => { + // Streaming the read must not silently become adjacent-line pairing: live + // traffic interleaves tenants, so two requests of one conversation sit + // several lines apart (dev-loop.md, "Never hand-roll identity in a probe"). + // Conversation A and B alternate; both pairs must be found, and no A/B + // cross-pair may be. + const a0 = plain("user", "conversation A"); + const b0 = plain("user", "conversation B"); + const p = capture([ + rec("2026-07-31T10:00:00.000Z", [a0, host("tu_a", ["RA"])]), + rec("2026-07-31T10:00:01.000Z", [b0, host("tu_b", ["RB"])]), + rec("2026-07-31T10:00:02.000Z", [a0, host("tu_a", []), plain("system", "RA")]), + rec("2026-07-31T10:00:03.000Z", [b0, host("tu_b", []), plain("system", "RB")]), + ]); + const r = await census([p]); + + assert.equal(r.pairs, 2, "one pair per conversation, never four adjacent-line pairs"); + assert.equal(r.conversations, 2); + assert.equal(r.tally.EXACT, 2); + assert.equal(r.tally.MISMATCH, 0, "a cross-conversation pair would score as a rule failure"); +}); diff --git a/test/deferred-tool-rewrite.test.mjs b/test/deferred-tool-rewrite.test.mjs new file mode 100644 index 00000000..4a57f9c3 --- /dev/null +++ b/test/deferred-tool-rewrite.test.mjs @@ -0,0 +1,950 @@ +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { mkdtemp, readFile, rm } from "node:fs/promises"; +import { tmpdir } from "node:os"; +import { dirname, join } from "node:path"; +import { fileURLToPath } from "node:url"; + +import ext, { + resolveToolRewriteSessionKey, + supportsToolAddition, + toolFingerprint, + classifyToolChange, + buildToolAdditionMessage, + injectAdditions, + forwardedTools, + anchorHash, + addBetaToken, +} from "../proxy/extensions/deferred-tool-rewrite.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const FIXTURE_PATH = join(__dirname, "fixtures", "toolload-1247.json"); +const GC_FIXTURE_PATH = join(__dirname, "fixtures", "toolgc-1536.json"); + +async function newTmp() { + return mkdtemp(join(tmpdir(), "deferred-tool-rewrite-test-")); +} + +function withEnv(overrides, fn) { + const saved = {}; + for (const k of Object.keys(overrides)) { + saved[k] = process.env[k]; + if (overrides[k] === undefined) delete process.env[k]; + else process.env[k] = overrides[k]; + } + try { + return fn(); + } finally { + for (const k of Object.keys(saved)) { + if (saved[k] === undefined) delete process.env[k]; + else process.env[k] = saved[k]; + } + } +} + +async function withEnvAsync(overrides, fn) { + const saved = {}; + for (const k of Object.keys(overrides)) { + saved[k] = process.env[k]; + if (overrides[k] === undefined) delete process.env[k]; + else process.env[k] = overrides[k]; + } + try { + return await fn(); + } finally { + for (const k of Object.keys(saved)) { + if (saved[k] === undefined) delete process.env[k]; + else process.env[k] = saved[k]; + } + } +} + +// The announcement path is gated on MODEL support (see supportsToolAddition): +// a body without a model is "unknown", which is deliberately OFF. Most tests +// here predate that gate and exercise the announcement, so they default to a +// supported model; the tests that care about the gate set `model` explicitly. +async function runExt(body, { headers, dir } = {}) { + const savedHome = process.env.CLAUDE_CONFIG_DIR; + if (dir) process.env.CLAUDE_CONFIG_DIR = dir; + try { + const withModel = body && body.model === undefined ? { ...body, model: "claude-opus-5" } : body; + const ctx = { body: withModel, meta: {}, headers: headers || {} }; + await ext.onRequest(ctx); + return ctx; + } finally { + if (dir) { + if (savedHome === undefined) delete process.env.CLAUDE_CONFIG_DIR; + else process.env.CLAUDE_CONFIG_DIR = savedHome; + } + } +} + +function tool(name, extra = {}) { + return { name, input_schema: { type: "object", properties: {} }, ...extra }; +} + +// ============================================================================= +// GATE OFF = INERT +// ============================================================================= + +test("gate off (CACHE_FIX_TOOL_REWRITE unset) — onRequest is a no-op", async () => { + const dir = await newTmp(); + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: undefined }, async () => { + const body = { tools: [tool("Read"), tool("Bash")], messages: [] }; + const ctx = await runExt(body, { dir }); + assert.equal(ctx.meta.deferredToolRewriteStats, undefined); + assert.deepEqual(ctx.body.tools, [tool("Read"), tool("Bash")]); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +// ============================================================================= +// PURE CLASSIFIER +// ============================================================================= + +test("classifyToolChange: no prior baseline → action no-baseline, knownTools = incoming", () => { + const incoming = [tool("Read"), tool("Bash")]; + const result = classifyToolChange(incoming, null); + assert.equal(result.action, "no-baseline"); + assert.deepEqual(result.knownTools, incoming); +}); + +test("classifyToolChange: identical tools[] → action unchanged", () => { + const prior = [tool("Read"), tool("Bash")]; + const incoming = [tool("Read"), tool("Bash")]; + const result = classifyToolChange(incoming, prior); + assert.equal(result.action, "unchanged"); +}); + +test("classifyToolChange: pure addition (SendMessage added) → action rewrite, new tool marked defer_loading:true", () => { + const prior = [tool("Read"), tool("Bash")]; + const incoming = [tool("Read"), tool("Bash"), tool("SendMessage")]; + const result = classifyToolChange(incoming, prior); + assert.equal(result.action, "rewrite"); + assert.deepEqual(result.newNames, ["SendMessage"]); + assert.equal(result.tools.length, 3); + assert.equal(result.tools[0].name, "Read"); + assert.equal(result.tools[0].defer_loading, undefined, "existing tools are not marked defer_loading"); + assert.equal(result.tools[2].name, "SendMessage"); + assert.equal(result.tools[2].defer_loading, true); +}); + +test("classifyToolChange: existing tool removed → action rewrite, held in place at its first-seen position, byte-identical", () => { + const prior = [tool("Read"), tool("Bash")]; + const incoming = [tool("Read")]; // Bash missing — harness GC'd it + const result = classifyToolChange(incoming, prior); + assert.equal(result.action, "rewrite"); + assert.deepEqual(result.heldNames, ["Bash"]); + assert.equal(result.newNames.length, 0); + assert.equal(result.tools.length, 2, "held tool is re-inserted"); + assert.deepEqual(result.tools[0], tool("Read")); + assert.deepEqual(result.tools[1], tool("Bash"), "held tool is byte-identical to its known form"); +}); + +test("classifyToolChange: pure reorder (no add/remove) → action rewrite, output pinned to first-seen order", () => { + const prior = [tool("Read"), tool("Bash"), tool("SendMessage")]; + const incoming = [tool("SendMessage"), tool("Read"), tool("Bash")]; // reordered, nothing added/removed + const result = classifyToolChange(incoming, prior); + assert.equal(result.action, "rewrite"); + assert.deepEqual(result.heldNames, []); + assert.deepEqual(result.newNames, []); + assert.deepEqual( + result.tools.map((t) => t.name), + ["Read", "Bash", "SendMessage"], + "output order is first-seen order, not the incoming array's order", + ); +}); + +test("classifyToolChange: existing tool's schema changed → action reset, reason tool-schema-changed", () => { + const prior = [tool("Read", { input_schema: { type: "object", properties: { file_path: { type: "string" } } } })]; + const incoming = [tool("Read", { input_schema: { type: "object", properties: { path: { type: "string" } } } })]; + const result = classifyToolChange(incoming, prior); + assert.equal(result.action, "reset"); + assert.equal(result.reason, "tool-schema-changed"); +}); + +test("classifyToolChange: addition AND removal in the same request → composes (held removal + additive new tool), still rewrite", () => { + const prior = [tool("Read"), tool("Bash")]; + const incoming = [tool("Read"), tool("SendMessage")]; // Bash removed, SendMessage added + const result = classifyToolChange(incoming, prior); + assert.equal(result.action, "rewrite"); + assert.deepEqual(result.heldNames, ["Bash"]); + assert.deepEqual(result.newNames, ["SendMessage"]); + assert.deepEqual( + result.tools.map((t) => t.name), + ["Read", "Bash", "SendMessage"], + "held tool re-inserted at its first-seen position, new tool appended", + ); + assert.equal(result.tools[2].defer_loading, true); +}); + +test("classifyToolChange: a tool carrying OUR OWN defer_loading marker from a prior rewrite is not misread as schema-changed", () => { + // Simulates: prior known set was captured AFTER a rewrite had already + // marked a tool defer_loading:true; toolFingerprint must ignore that + // marker so re-comparing it against itself is still "unchanged". + const priorWithMarker = [tool("Read"), { ...tool("SendMessage"), defer_loading: true }]; + const incoming = [tool("Read"), tool("SendMessage")]; // no marker this time — still the same tool + const result = classifyToolChange(incoming, priorWithMarker); + assert.equal(result.action, "unchanged"); +}); + +test("toolFingerprint: order-independent on schema property keys", () => { + const a = tool("Read", { input_schema: { type: "object", properties: { a: {}, b: {} } } }); + const b = tool("Read", { input_schema: { type: "object", properties: { b: {}, a: {} } } }); + assert.equal(toolFingerprint(a), toolFingerprint(b)); +}); + +test("toolFingerprint: missing tool or missing name → null", () => { + assert.equal(toolFingerprint(null), null); + assert.equal(toolFingerprint({}), null); +}); + +// ============================================================================= +// WIRE SHAPES +// ============================================================================= + +test("buildToolAdditionMessage: documented contract — system-role message with tool_addition/tool_reference blocks", () => { + const msg = buildToolAdditionMessage(["SendMessage", "TaskCreate"]); + assert.equal(msg.role, "system"); + assert.equal(msg.content.length, 2); + assert.deepEqual(msg.content[0], { + type: "tool_addition", + tool: { type: "tool_reference", name: "SendMessage" }, + }); + assert.deepEqual(msg.content[1], { + type: "tool_addition", + tool: { type: "tool_reference", name: "TaskCreate" }, + }); +}); + +test("injectAdditions: splices the persisted message after its anchor, byte-identical", () => { + const u0 = { role: "user", content: [{ type: "text", text: "u0" }] }; + const a1 = { role: "assistant", content: [{ type: "text", text: "a1" }] }; + const u2 = { role: "user", content: [{ type: "text", text: "u2" }] }; + const addMsg = buildToolAdditionMessage(["SendMessage"]); + const additions = [{ names: ["SendMessage"], anchorHash: anchorHash(u0), message: addMsg }]; + const { messages, reanchored } = injectAdditions([u0, a1, u2], additions); + assert.equal(reanchored.length, 0); + assert.equal(messages.length, 4); + assert.equal(messages[1], addMsg, "injected immediately after the anchor"); + assert.equal(messages[0], u0); + assert.equal(messages[2], a1); +}); + +test("injectAdditions: pruned anchor → re-anchor after last user message, reported", () => { + const uNew = { role: "user", content: [{ type: "text", text: "new turn" }] }; + const addMsg = buildToolAdditionMessage(["SendMessage"]); + const additions = [{ names: ["SendMessage"], anchorHash: "gone-hash", message: addMsg }]; + const { messages, reanchored } = injectAdditions([uNew], additions); + assert.equal(messages.length, 2); + assert.equal(messages[1], addMsg, "re-anchored after the last user message"); + assert.equal(reanchored.length, 1); + assert.equal(reanchored[0].anchorHash, anchorHash(uNew)); +}); + +test("injectAdditions: no user message at all → injection skipped, reported with null anchor", () => { + const a = { role: "assistant", content: [{ type: "text", text: "only assistant" }] }; + const addMsg = buildToolAdditionMessage(["SendMessage"]); + const additions = [{ names: ["SendMessage"], anchorHash: "gone", message: addMsg }]; + const { messages, reanchored } = injectAdditions([a], additions); + assert.equal(messages.length, 1, "nothing injected"); + assert.equal(reanchored[0].anchorHash, null); +}); + +// BITE — the LIFO bug (BACKLOG "READY — fix injectAdditions' LIFO stacking"). +// Real capture s-dc3f8071, n=372-397: an MCP-tool-discovery cascade produces +// one new `additions` entry per request, all anchored to the SAME message +// (the real conversation stays at 1 message the whole burst). The buggy +// implementation re-finds the anchor fresh on every iteration (the search +// excludes role==="system", so already-injected additions are invisible to +// it) and always splices at anchorIdx+1 — so the newest addition always +// lands closest to the anchor, pushing every earlier addition one slot +// further back: a LIFO stack that reorders the already-forwarded prefix on +// every new addition. Fix: a shared anchor's run stays in discovery order +// (FIFO) — a new addition appends AFTER the additions already injected +// there, so the forwarded prefix is a byte-stable prefix of every +// subsequent output and only the tail of the run grows. +test("injectAdditions: three additions sharing one anchor → output is discovery order (FIFO), not LIFO", () => { + const u0 = { role: "user", content: [{ type: "text", text: "u0" }] }; + const sharedAnchor = anchorHash(u0); + const addA = buildToolAdditionMessage(["ToolA"]); + const addB = buildToolAdditionMessage(["ToolB"]); + const addC = buildToolAdditionMessage(["ToolC"]); + + // additions array is in DISCOVERY order (oldest first), matching how + // onRequest concatenates them across successive requests. + const additions = [ + { names: ["ToolA"], anchorHash: sharedAnchor, message: addA }, + { names: ["ToolB"], anchorHash: sharedAnchor, message: addB }, + { names: ["ToolC"], anchorHash: sharedAnchor, message: addC }, + ]; + + const { messages } = injectAdditions([u0], additions); + assert.deepEqual( + messages.map((m) => m.content?.[0]?.tool?.name ?? "u0"), + ["u0", "ToolA", "ToolB", "ToolC"], + "run stays in discovery order — ToolA first (oldest), ToolC last (newest), never reordered", + ); +}); + +test("injectAdditions: shared-anchor prefix stability — output N is a byte-prefix of output N+1", () => { + const u0 = { role: "user", content: [{ type: "text", text: "u0" }] }; + const sharedAnchor = anchorHash(u0); + const addA = buildToolAdditionMessage(["ToolA"]); + const addB = buildToolAdditionMessage(["ToolB"]); + + // Simulates two successive requests: first only ToolA has been discovered, + // then ToolB arrives too (additions accumulate, oldest first — as onRequest + // does via `additions.concat([...])`). + const afterFirst = injectAdditions([u0], [{ names: ["ToolA"], anchorHash: sharedAnchor, message: addA }]); + const afterSecond = injectAdditions( + [u0], + [ + { names: ["ToolA"], anchorHash: sharedAnchor, message: addA }, + { names: ["ToolB"], anchorHash: sharedAnchor, message: addB }, + ], + ); + + const prefixBytes = JSON.stringify(afterFirst.messages); + const nextBytes = JSON.stringify(afterSecond.messages.slice(0, afterFirst.messages.length)); + assert.equal( + nextBytes, + prefixBytes, + "the already-forwarded prefix must be byte-identical once a new addition arrives — only the tail grows", + ); + assert.equal(afterSecond.messages.length, 3, "the new addition appends at the tail of the run"); +}); + +test("forwardedTools: names covered by additions get defer_loading, others stay untouched", () => { + const known = [tool("Read"), tool("SendMessage")]; + const additions = [{ names: ["SendMessage"], anchorHash: "h", message: {} }]; + const fwd = forwardedTools(known, additions); + assert.deepEqual(fwd[0], tool("Read")); + assert.equal(fwd[1].defer_loading, true); +}); + +test("addBetaToken: adds the token when header absent", () => { + const headers = {}; + addBetaToken(headers); + assert.equal(headers["anthropic-beta"], "mid-conversation-tool-changes-2026-07-01"); +}); + +test("addBetaToken: appends to an existing anthropic-beta header without duplicating", () => { + const headers = { "anthropic-beta": "other-beta-2026-01-01" }; + addBetaToken(headers); + assert.equal(headers["anthropic-beta"], "other-beta-2026-01-01, mid-conversation-tool-changes-2026-07-01"); + addBetaToken(headers); // idempotent + assert.equal(headers["anthropic-beta"], "other-beta-2026-01-01, mid-conversation-tool-changes-2026-07-01"); +}); + +test("addBetaToken: case-insensitive header key lookup (Anthropic-Beta)", () => { + const headers = { "Anthropic-Beta": "x" }; + addBetaToken(headers); + assert.equal(headers["Anthropic-Beta"], "x, mid-conversation-tool-changes-2026-07-01"); + assert.equal(headers["anthropic-beta"], undefined, "must mutate the existing key, not add a duplicate"); +}); + +// ============================================================================= +// EXTENSION CONTRACT — full onRequest round trip +// ============================================================================= + +test("onRequest: first request (no prior state) → tools forwarded unchanged, baseline persisted", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-first" }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const body = { tools: [tool("Read"), tool("Bash")], system: [{ type: "text", text: "sys" }], messages: [] }; + const ctx = await runExt(body, { headers, dir }); + assert.equal(ctx.meta.deferredToolRewriteStats.action, "no-baseline"); + assert.deepEqual(ctx.body.tools, [tool("Read"), tool("Bash")]); + assert.equal(ctx.body.system.length, 1, "no tool_addition appended on the baseline-establishing request"); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("onRequest: second request adds SendMessage → tools[] byte-stable for known tools + defer_loading on the new one + tool_addition system block + beta header", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-add" }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + // Same conversation across both requests: msgs[0] is what identifies + // one, so an empty first request would now be a DIFFERENT conversation + // (and no real first request is empty). + const u1 = { role: "user", content: [{ type: "text", text: "turn 1" }] }; + const body1 = { tools: [tool("Read"), tool("Bash")], system: [{ type: "text", text: "sys" }], messages: [u1] }; + await runExt(body1, { headers, dir }); + + const body2 = { + tools: [tool("Read"), tool("Bash"), tool("SendMessage")], + system: [{ type: "text", text: "sys" }], + messages: [u1], + }; + const ctx2 = await runExt(body2, { headers, dir }); + + assert.equal(ctx2.meta.deferredToolRewriteStats.action, "rewrite"); + assert.deepEqual(ctx2.meta.deferredToolRewriteStats.newNames, ["SendMessage"]); + + // Known tools byte-stable (no defer_loading marker added to them). + assert.deepEqual(ctx2.body.tools[0], tool("Read")); + assert.deepEqual(ctx2.body.tools[1], tool("Bash")); + // New tool additively marked. + assert.equal(ctx2.body.tools[2].name, "SendMessage"); + assert.equal(ctx2.body.tools[2].defer_loading, true); + + // Top-level system UNTOUCHED (Phase A appended here — wrong location). + assert.equal(ctx2.body.system.length, 1); + // The announcement is a system-ROLE message injected into messages[], + // after the anchor (the last message at addition time). + assert.equal(ctx2.body.messages.length, 2); + const injected = ctx2.body.messages[1]; + assert.equal(injected.role, "system"); + assert.deepEqual(injected.content[0], { + type: "tool_addition", + tool: { type: "tool_reference", name: "SendMessage" }, + }); + + // Beta header added. + assert.equal(headers["anthropic-beta"], "mid-conversation-tool-changes-2026-07-01"); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("onRequest: subsequent requests re-inject byte-identically at the same anchor (statelessness handled)", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-stable" }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const u1 = { role: "user", content: [{ type: "text", text: "turn 1" }] }; + const body1 = { tools: [tool("Read"), tool("Bash")], system: [{ type: "text", text: "sys" }], messages: [u1] }; + await runExt(body1, { headers, dir }); + + const body2 = { + tools: [tool("Read"), tool("Bash"), tool("SendMessage")], + system: [{ type: "text", text: "sys" }], + messages: [u1], + }; + const ctx2 = await runExt(body2, { headers, dir }); + const injectedAt2 = JSON.stringify(ctx2.body.messages[1]); + + // Requests 3 and 4: CC sends its own view (no injected message, no + // defer_loading markers) with the conversation advancing. The proxy + // must re-inject at the SAME anchor, byte-identically, and re-apply + // the frozen tools[] with the marker — every request. + for (const extra of [ + [{ role: "assistant", content: [{ type: "text", text: "a2" }] }], + [ + { role: "assistant", content: [{ type: "text", text: "a2" }] }, + { role: "user", content: [{ type: "text", text: "turn 3" }] }, + ], + ]) { + const body = { + tools: [tool("Read"), tool("Bash"), tool("SendMessage")], + system: [{ type: "text", text: "sys" }], + messages: [u1, ...extra], + }; + const ctx = await runExt(body, { headers, dir }); + assert.equal(ctx.meta.deferredToolRewriteStats.action, "unchanged"); + assert.equal(ctx.meta.deferredToolRewriteStats.injected, 1); + // Injection sits right after the anchor (u1), byte-identical. + assert.equal(JSON.stringify(ctx.body.messages[1]), injectedAt2); + // Frozen tools[] with defer_loading re-applied. + assert.equal(ctx.body.tools[2].defer_loading, true); + // Top-level system never touched. + assert.equal(ctx.body.system.length, 1); + } + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("onRequest: pruned anchor → re-anchor once, stable thereafter", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-prune" }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + // msgs[0] identifies the conversation, so it must SURVIVE the prune for + // this to exercise re-anchoring rather than a new conversation. The + // addition anchors to the LAST message, so anchor and msgs[0] are + // deliberately different messages here. + const u0 = { role: "user", content: [{ type: "text", text: "turn 0" }] }; + const u1 = { role: "user", content: [{ type: "text", text: "turn 1" }] }; + await runExt({ tools: [tool("Read")], system: [], messages: [u0] }, { headers, dir }); + await runExt( + { tools: [tool("Read"), tool("SendMessage")], system: [], messages: [u0, u1] }, + { headers, dir }, + ); + + // Context management pruned the ANCHOR message while msgs[0] survives — + // the same conversation, minus the turn the addition was anchored to. + // (Replacing msgs[0] instead would be a different conversation by + // design: the prefix died at index 0, so no cache survives it and a + // fresh state costs nothing. The re-anchor path is for this case.) + const uNew = { role: "user", content: [{ type: "text", text: "post-prune turn" }] }; + const ctx3 = await runExt( + { tools: [tool("Read"), tool("SendMessage")], system: [], messages: [u0, uNew] }, + { headers, dir }, + ); + assert.equal(ctx3.meta.deferredToolRewriteStats.reanchored, 1); + assert.equal(ctx3.body.messages[2].role, "system", "re-anchored after the last user message"); + + // Next request: the new anchor holds — no further re-anchor. + const ctx4 = await runExt( + { + tools: [tool("Read"), tool("SendMessage")], + system: [], + messages: [u0, uNew, { role: "assistant", content: [{ type: "text", text: "a" }] }], + }, + { headers, dir }, + ); + assert.equal(ctx4.meta.deferredToolRewriteStats.reanchored, 0); + // Anchored after uNew, which is now index 1 — so the injection is at 2. + assert.equal(ctx4.body.messages[2].role, "system"); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("onRequest BITE: MCP-discovery cascade — same 1-message conversation, tools[] grows 3x → additions stack in discovery order, prefix stable", async () => { + // Mirrors the real capture (s-dc3f8071, n=372-397): CC's own progressive + // MCP-tool-discovery cascade at session boot sends one new tool batch per + // request while the real conversation never grows past 1 message, so every + // addition shares the identical anchor (messages[0]). + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-cascade" }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const u0 = { role: "user", content: [{ type: "text", text: "u0" }] }; + const base = { system: [], messages: [u0], model: "claude-opus-5" }; + + await runExt({ ...base, tools: [tool("Read"), tool("Bash")] }, { headers, dir }); // no-baseline + const ctx1 = await runExt( + { ...base, tools: [tool("Read"), tool("Bash"), tool("ToolA")] }, + { headers, dir }, + ); + const ctx2 = await runExt( + { ...base, tools: [tool("Read"), tool("Bash"), tool("ToolA"), tool("ToolB")] }, + { headers, dir }, + ); + const ctx3 = await runExt( + { ...base, tools: [tool("Read"), tool("Bash"), tool("ToolA"), tool("ToolB"), tool("ToolC")] }, + { headers, dir }, + ); + + const names = (ctx) => + ctx.body.messages + .filter((m) => m.role === "system" && Array.isArray(m.content) && m.content[0]?.type === "tool_addition") + .flatMap((m) => m.content.map((b) => b.tool.name)); + + assert.deepEqual(names(ctx1), ["ToolA"]); + assert.deepEqual(names(ctx2), ["ToolA", "ToolB"], "ToolA stays first — discovery order, not LIFO"); + assert.deepEqual(names(ctx3), ["ToolA", "ToolB", "ToolC"], "run grows only at the tail"); + + // The forwarded prefix already produced must be a byte-prefix of the + // next request's output — this is the "reorders the already-forwarded + // prefix" bust the probe measured. + const prefixOf = (ctx, n) => JSON.stringify(ctx.body.messages.slice(0, n)); + assert.equal(prefixOf(ctx2, ctx1.body.messages.length), JSON.stringify(ctx1.body.messages)); + assert.equal(prefixOf(ctx3, ctx2.body.messages.length), JSON.stringify(ctx2.body.messages)); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("onRequest: a tool removed after an addition → HELD (rewrite, passthrough of held tool), no beta header (nothing new to defer)", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-hold" }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const body1 = { tools: [tool("Read"), tool("Bash")], system: [{ type: "text", text: "sys" }], messages: [] }; + await runExt(body1, { headers, dir }); + + const body2 = { tools: [tool("Read")], system: [{ type: "text", text: "sys" }], messages: [] }; + const ctx2 = await runExt(body2, { headers, dir }); + + assert.equal(ctx2.meta.deferredToolRewriteStats.action, "rewrite"); + assert.deepEqual(ctx2.meta.deferredToolRewriteStats.heldNames, ["Bash"]); + assert.deepEqual(ctx2.body.tools, [tool("Read"), tool("Bash")], "Bash held in place, byte-identical"); + assert.equal(ctx2.body.system.length, 1, "a hold announces nothing — no tool_addition block appended"); + assert.equal(headers["anthropic-beta"], undefined, "no defer_loading tool this turn -> no beta token needed"); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("onRequest: a known tool's SCHEMA changing (not removal) → still resets (honest content change, never served stale)", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-schema-reset" }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const body1 = { tools: [tool("Read"), tool("Bash")], system: [{ type: "text", text: "sys" }], messages: [] }; + await runExt(body1, { headers, dir }); + + const body2 = { + tools: [tool("Read", { input_schema: { type: "object", properties: { path: { type: "string" } } } }), tool("Bash")], + system: [{ type: "text", text: "sys" }], + messages: [], + }; + const ctx2 = await runExt(body2, { headers, dir }); + + assert.equal(ctx2.meta.deferredToolRewriteStats.action, "reset"); + assert.equal(ctx2.meta.deferredToolRewriteStats.reason, "tool-schema-changed"); + assert.equal(headers["anthropic-beta"], undefined); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("onRequest: state persists across a simulated restart (fresh dynamic import) via disk", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-restart" }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const body1 = { tools: [tool("Read"), tool("Bash")], system: [{ type: "text", text: "sys" }], messages: [] }; + await runExt(body1, { headers, dir }); + + // Simulate restart: fresh module import, empty in-memory state — the + // classifier must reload the persisted baseline from disk. + const { pathToFileURL } = await import("node:url"); + const modPath = join(__dirname, "..", "proxy", "extensions", "deferred-tool-rewrite.mjs"); + const reloaded = await import(pathToFileURL(modPath).href + "?restart-probe=" + Date.now()); + + const savedHome = process.env.CLAUDE_CONFIG_DIR; + process.env.CLAUDE_CONFIG_DIR = dir; + try { + const body2 = { + tools: [tool("Read"), tool("Bash"), tool("SendMessage")], + system: [{ type: "text", text: "sys" }], + messages: [], + }; + const ctx2 = { body: body2, meta: {}, headers }; + await reloaded.default.onRequest(ctx2); + assert.equal(ctx2.meta.deferredToolRewriteStats.action, "rewrite", "post-restart module reloaded baseline from disk"); + assert.deepEqual(ctx2.meta.deferredToolRewriteStats.newNames, ["SendMessage"]); + } finally { + if (savedHome === undefined) delete process.env.CLAUDE_CONFIG_DIR; + else process.env.CLAUDE_CONFIG_DIR = savedHome; + } + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +// ============================================================================= +// SYNTHETIC FIXTURE (ledger SHAPE, 2026-07-27 12:47:56 — tools[SendMessage:added]) +// ============================================================================= + +test("fixture toolload-1247.json: prior → incoming reproduces the ledger's tools[SendMessage:added] shape as a rewrite", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-fixture" }; + try { + const raw = await readFile(FIXTURE_PATH, "utf-8"); + const fixture = JSON.parse(raw); + + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const ctx1 = await runExt(structuredClone(fixture.prior), { headers, dir }); + assert.equal(ctx1.meta.deferredToolRewriteStats.action, "no-baseline"); + + const ctx2 = await runExt(structuredClone(fixture.incoming), { headers, dir }); + assert.equal(ctx2.meta.deferredToolRewriteStats.action, "rewrite"); + assert.deepEqual(ctx2.meta.deferredToolRewriteStats.newNames, ["SendMessage"]); + + // Known tools (Read, Bash) byte-identical to the fixture's prior entries. + assert.deepEqual(ctx2.body.tools[0], fixture.prior.tools[0]); + assert.deepEqual(ctx2.body.tools[1], fixture.prior.tools[1]); + // New tool present — but NOT marked, and this is the uncomfortable part. + // + // This fixture is the real 12:47:56 event that motivated the whole + // extension (threat-matrix rows 6 and 13, the 175k and 766k busts), and + // its model is `claude-sonnet-4-6`. The mid-conversation-tool-changes + // contract is not supported there — a sonnet-5 request carrying it + // returned `400 tool_addition/tool_removal is not supported on this + // model` on 2026-07-28 — so the announcement path is gated off for this + // model family and the new tool is forwarded plainly. + // + // Which means the mitigation does NOT apply to the traffic it was + // designed for. Recorded in the matrix rather than papered over here: + // holding tools[] stable and pinning ORDER still work on every model + // (they need no beta), but ADDITIONS on sonnet remain an honest bust. + const sendMsgTool = ctx2.body.tools.find((t) => t.name === "SendMessage"); + assert.ok(sendMsgTool, "the new tool is still forwarded — degrade, never drop"); + assert.ok( + !("defer_loading" in sendMsgTool), + "defer_loading belongs to a contract this model rejects with a 400", + ); + // tools[] count did not shrink or reorder the known prefix. + assert.equal(ctx2.body.tools.length, 3); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +// ============================================================================= +// SYNTHETIC FIXTURE (ledger SHAPE, 2026-07-27 15:36 — tools:REMOVE + reorder, +// threat-matrix row 13) +// ============================================================================= + +test("fixture toolgc-1536.json: CronCreate removed + DeferredToolPlaceholder reordered -> held in place, first-seen order pinned", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-gc-fixture" }; + try { + const raw = await readFile(GC_FIXTURE_PATH, "utf-8"); + const fixture = JSON.parse(raw); + + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const ctx1 = await runExt(structuredClone(fixture.prior), { headers, dir }); + assert.equal(ctx1.meta.deferredToolRewriteStats.action, "no-baseline"); + + const ctx2 = await runExt(structuredClone(fixture.incoming), { headers, dir }); + assert.equal(ctx2.meta.deferredToolRewriteStats.action, "rewrite"); + assert.deepEqual(ctx2.meta.deferredToolRewriteStats.heldNames, ["CronCreate"]); + assert.deepEqual(ctx2.meta.deferredToolRewriteStats.newNames, []); + + // Output order is first-seen order from the baseline request, not the + // incoming (reordered, CronCreate-missing) array's order. + assert.deepEqual( + ctx2.body.tools.map((t) => t.name), + ["Read", "Bash", "CronCreate", "DeferredToolPlaceholder"], + ); + // Held tool is byte-identical to its baseline form. + assert.deepEqual( + ctx2.body.tools.find((t) => t.name === "CronCreate"), + fixture.prior.tools.find((t) => t.name === "CronCreate"), + ); + // No addition -> no tool_addition block, no beta header. + assert.equal(ctx2.body.system.length, 1); + assert.equal(headers["anthropic-beta"], undefined); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +// ============================================================================= +// SESSION KEY RESOLUTION +// ============================================================================= + +// Volatile session URL inside a tool DESCRIPTION. CC embeds the per-session +// console URL in Bash's description (it is the commit trailer the model is +// told to write) and does not embed it consistently: measured over 652 +// same-key request pairs, it flipped twice. tools[] renders BEFORE system and +// messages, so no breakpoint survives a tools[] byte change — one such flip +// cost 705k creation tokens. Nothing about what Bash DOES changes across it. +test("toolFingerprint: the per-session console URL does not count as a schema change", () => { + const withUrl = { + name: "Bash", + description: + "Run a command.\n\nCo-Authored-By: X\nClaude-Session: https://claude.ai/code/session_01ABC\n" + + "- End PR bodies with:\n\nhttps://claude.ai/code/session_01ABC", + input_schema: { type: "object" }, + }; + const without = { + name: "Bash", + description: "Run a command.\n\nCo-Authored-By: X\n- End PR bodies with:", + input_schema: { type: "object" }, + }; + assert.equal(toolFingerprint(withUrl), toolFingerprint(without)); +}); + +// The narrowness is the safety property: serving a stale schema for a tool +// whose contract actually changed is the one failure this extension must +// never produce. +test("toolFingerprint: a genuine description change IS still a schema change", () => { + const a = { name: "Bash", description: "Run a command.", input_schema: { type: "object" } }; + const b = { name: "Bash", description: "Run a DIFFERENT command.", input_schema: { type: "object" } }; + assert.notEqual(toolFingerprint(a), toolFingerprint(b)); + // input_schema changes too, obviously. + const c = { name: "Bash", description: "Run a command.", input_schema: { type: "object", required: ["x"] } }; + assert.notEqual(toolFingerprint(a), toolFingerprint(c)); +}); + +test("resolveToolRewriteSessionKey: prefers session-id header, falls back to model string", () => { + // Header path is sub-keyed by system-prompt hash (threat-matrix row 14) — + // "nosys" when the body carries no system prompt. + const withHeader = resolveToolRewriteSessionKey({ "x-claude-code-session-id": "abc-123" }, { model: "x" }); + assert.equal(withHeader, "s-abc-123-nosys-empty"); + const withoutHeader = resolveToolRewriteSessionKey(null, { model: "claude-sonnet-4-6" }); + assert.equal(withoutHeader, "c-claude-sonnet-4-6-empty"); +}); + +// Regression guard for the row-14 collision this extension shipped with: +// one session-id header, several tenants (main thread, subagents, CC's own +// sidecar calls), each with a DIFFERENT system prompt and a different tools +// array. Keyed on the bare session id they shared one baseline, so every +// alternation classified as "schema changed" and re-baselined — measured on +// real traffic as tools[] churn RISING when the extension was enabled. +test("resolveToolRewriteSessionKey: sidecars sharing a session-id get distinct keys", () => { + const headers = { "x-claude-code-session-id": "abc-123" }; + const main = resolveToolRewriteSessionKey(headers, { + system: [{ type: "text", text: "You are Claude Code, Anthropic's official CLI." }], + }); + const sidecar = resolveToolRewriteSessionKey(headers, { + system: [{ type: "text", text: "You are a Claude agent, built on Anthropic's API." }], + }); + assert.notEqual(main, sidecar); + // Same system prompt → same bucket, so the main thread stays on one baseline. + const mainAgain = resolveToolRewriteSessionKey(headers, { + system: [{ type: "text", text: "You are Claude Code, Anthropic's official CLI." }], + }); + assert.equal(main, mainAgain); +}); + +// --- Model gate (the 400 that killed a live dispatch) --- +// +// 2026-07-28: a sonnet-5 subagent dispatch died with +// `API Error: 400 tool_addition/tool_removal is not supported on this model`. +// The contract is a documented beta but support is per-MODEL, and this +// extension applied it to whatever came through. A cache mitigation that can +// HARD-FAIL a request is worse than no mitigation, so the gate is opt-IN: +// unknown models degrade to forwarding the new tool normally. + +test("supportsToolAddition: opt-IN, so an unknown model is OFF", () => { + assert.equal(supportsToolAddition("claude-opus-5"), true); + assert.equal(supportsToolAddition("claude-opus-5-20260101"), true, "date-suffixed ids must match by prefix"); + // Wire evidence 2026-07-29 (probe session c05a754c: block forwarded + // byte-identically, API streamed 200). + assert.equal(supportsToolAddition("claude-fable-5"), true); + // The measured failure. + assert.equal(supportsToolAddition("claude-sonnet-5"), false); + // Everything unknown is off — a new model must not be able to break a + // request just by existing. + assert.equal(supportsToolAddition("claude-haiku-4-5"), false); + assert.equal(supportsToolAddition("some-future-model"), false); + assert.equal(supportsToolAddition(undefined), false); + assert.equal(supportsToolAddition(null), false); +}); + +test("supportsToolAddition: EXTRA override admits a candidate for the live probe, per call", () => { + // The override serves the throwaway acceptance-probe proxy only (it is how + // fable-5 earned its baseline entry on 2026-07-29); it must be read per + // call (a long-lived process picks up the change without a module reload) + // and must not disturb the baseline list. + const prev = process.env.CACHE_FIX_TOOL_ADDITION_EXTRA; + try { + process.env.CACHE_FIX_TOOL_ADDITION_EXTRA = "claude-candidate-x, claude-candidate-y"; + assert.equal(supportsToolAddition("claude-candidate-x"), true); + assert.equal(supportsToolAddition("claude-candidate-y-20260101"), true); + assert.equal(supportsToolAddition("claude-sonnet-5"), false, "override must not widen beyond its prefixes"); + delete process.env.CACHE_FIX_TOOL_ADDITION_EXTRA; + assert.equal(supportsToolAddition("claude-candidate-x"), false, "cleared override must clear per call"); + } finally { + if (prev === undefined) delete process.env.CACHE_FIX_TOOL_ADDITION_EXTRA; + else process.env.CACHE_FIX_TOOL_ADDITION_EXTRA = prev; + } +}); + +test("BITE — an unsupported model gets NO tool_addition, no beta header, tools passed through", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-sonnet" }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const u1 = { role: "user", content: [{ type: "text", text: "turn 1" }] }; + const base = { system: [], messages: [u1], model: "claude-sonnet-5" }; + await runExt({ ...base, tools: [tool("Read")] }, { headers, dir }); + const ctx = await runExt( + { ...base, tools: [tool("Read"), tool("SendMessage")] }, + { headers, dir }, + ); + // No injected system message anywhere in messages[]. + const injected = (ctx.body.messages || []).filter( + (m) => m.role === "system" && Array.isArray(m.content) && m.content.some((b) => b.type === "tool_addition"), + ); + assert.equal(injected.length, 0, "no tool_addition may reach a model that 400s on it"); + // No beta token. + const beta = Object.entries(ctx.headers || {}).find(([k]) => k.toLowerCase() === "anthropic-beta"); + assert.ok( + !beta || !String(beta[1]).includes("mid-conversation-tool-changes"), + "beta token must not be sent to an unsupported model", + ); + // And no defer_loading marker smuggled onto the new tool. + const sm = (ctx.body.tools || []).find((t) => t.name === "SendMessage"); + assert.ok(sm, "the new tool is still forwarded — degrade, do not drop"); + assert.ok(!("defer_loading" in sm), "defer_loading belongs to the contract the model rejects"); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("a suppressed announcement is LOUD: stderr once per model, telemetry every time", async () => { + // The silent version of this path is the failure mode: a new model family + // (documented rule is "Opus onward", so it likely supports the beta) pays + // a full-prefix bust per tool load with nothing anywhere saying so, until + // someone probes it by accident. The warning names the probe; telemetry + // records every occurrence for counting. + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-new-family" }; + const warnings = []; + const origWrite = process.stderr.write; + process.stderr.write = (s, ...rest) => { + if (String(s).includes("not allowlisted for tool_addition")) { + warnings.push(String(s)); + return true; + } + return origWrite.call(process.stderr, s, ...rest); + }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const u1 = { role: "user", content: [{ type: "text", text: "turn 1" }] }; + const base = { system: [], messages: [u1], model: "claude-new-family-7" }; + await runExt({ ...base, tools: [tool("Read")] }, { headers, dir }); + await runExt({ ...base, tools: [tool("Read"), tool("SendMessage")] }, { headers, dir }); + assert.equal(warnings.length, 1, "the first suppression must warn"); + assert.match(warnings[0], /claude-new-family-7/); + assert.match(warnings[0], /probe/i, "the warning must name the way out"); + // A second suppressed load on the same model: telemetry yes, stderr no. + await runExt( + { ...base, tools: [tool("Read"), tool("SendMessage"), tool("Monitor")] }, + { headers, dir }, + ); + assert.equal(warnings.length, 1, "once per model per process"); + const { readdir: rd, readFile: rf } = await import("node:fs/promises"); + const snapDir = join(dir, "cache-fix-snapshots"); + const evFile = (await rd(snapDir)).find((f) => f.endsWith("-deferred-tool-events.jsonl")); + assert.ok(evFile, "telemetry file must exist"); + const events = (await rf(join(snapDir, evFile), "utf-8")).trim().split("\n").map(JSON.parse); + const sup = events.filter((e) => e.suppressed); + assert.equal(sup.length, 2, "every suppressed occurrence is recorded"); + assert.equal(sup[0].model, "claude-new-family-7"); + assert.equal(sup[0].injected, 0); + }); + } finally { + process.stderr.write = origWrite; + await rm(dir, { recursive: true, force: true }); + } +}); + +test("a SUPPORTED model still gets the announcement (the gate is not a kill switch)", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-opus" }; + try { + await withEnvAsync({ CACHE_FIX_TOOL_REWRITE: "1" }, async () => { + const u1 = { role: "user", content: [{ type: "text", text: "turn 1" }] }; + const base = { system: [], messages: [u1], model: "claude-opus-5" }; + await runExt({ ...base, tools: [tool("Read")] }, { headers, dir }); + const ctx = await runExt( + { ...base, tools: [tool("Read"), tool("SendMessage")] }, + { headers, dir }, + ); + const injected = (ctx.body.messages || []).filter( + (m) => m.role === "system" && Array.isArray(m.content) && m.content.some((b) => b.type === "tool_addition"), + ); + assert.equal(injected.length, 1, "opus must keep the mitigation"); + }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); diff --git a/test/extended-absorb.test.mjs b/test/extended-absorb.test.mjs new file mode 100644 index 00000000..8c170898 --- /dev/null +++ b/test/extended-absorb.test.mjs @@ -0,0 +1,159 @@ +// extended-absorb — what the EXTENDED sub-class of the row-4 container +// migration actually IS, and the declaration the absorption rides on. +// +// Grounding, measured 2026-07-31 on capture s-77fe2779 (request index 101, +// ts 11:41:05.778Z, and its same-conversation predecessor at index 100 — +// paired by `conversationOf`, never by capture adjacency): +// +// before[99] user tool_result + ONE block (330ch) +// before[100] system a standalone harness reminder (421ch) +// after[101] system ONE message, 716ch = 293 + "\n\n" + 421 +// +// 293 is the wrapper-stripped reminder from before[99]; 421 is before[100] +// VERBATIM. So the census's EXTENDED verdict (`actual.startsWith(recon)`, +// reminder-migration-census.mjs:96) is a true statement about a MERGE, not +// about new text: CC swallowed an existing standalone message into the +// migrated reminder. The "extra" bytes are a message the proxy already +// forwarded once, at its own index, one request earlier. +// +// That distinction decides the mitigation and was measured, not reasoned: +// re-emitting those bytes as a fresh message at a frozen TAIL index leaves the +// first forwarded divergence at 100 (unchanged); putting them back at the +// index the swallowed message occupied moves it to 123 of 124. The class is +// therefore an UN-MERGE, not a relocation. +// +// The text below is synthetic and deterministic (harvest.mjs's token shape), +// never capture bytes — this repo is public. A straight harvest scrub could +// not carry this class anyway: scrubText tokenizes each text independently, so +// `scrub(a + "\n\n" + b) !== scrub(a) + "\n\n" + scrub(b)` and the prefix +// relation that DEFINES EXTENDED does not survive sanitization. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { classifyPinned } from "../proxy/extensions/insertion-normalization.mjs"; +import { canonical, classify } from "../tools/reminder-migration-census.mjs"; + +// Structure of the measured pair, text tokenized. Lengths are the real ones so +// the arithmetic that identifies the class stays legible. +const HOOK_INNER = "t_a1b2c3d4e5f6_293"; +const HOOK_BLOCK = `\n${HOOK_INNER}\n`; +const SWALLOWED = "t_9f8e7d6c5b4a_421"; // the standalone that existed already +const MERGED = `${HOOK_INNER}\n\n${SWALLOWED}`; + +const userMsg = (text) => ({ role: "user", content: [{ type: "text", text }] }); +const assistantMsg = (text) => ({ role: "assistant", content: [{ type: "text", text }] }); +const hostMsg = () => ({ + role: "user", + content: [{ type: "text", text: "t_host_0001_120" }, { type: "text", text: HOOK_BLOCK }], +}); +const standalone = (text) => ({ role: "system", content: [{ type: "text", text }] }); + +const pinCanon = (messages) => classifyPinned(messages, null).canonicalEntries; + +test("the EXTENDED delta is a message the PREDECESSOR already carried, not new text", () => { + // Definition first (dev-loop, "Adding a check"): EXTENDED means CC's later + // standalone has the canonical reconstruction as a byte prefix. The claim + // under test is about what the REMAINDER is — the grounding this dispatch + // was given said "new harness text", and the bytes say otherwise. + const recon = canonical([HOOK_BLOCK]); + assert.equal(classify(recon, MERGED), "EXTENDED", "precondition: the census calls this EXTENDED"); + + const extra = MERGED.slice(recon.length); + assert.equal(extra.slice(0, 2), "\n\n", "the join separator is the canonical one"); + + const predecessor = [userMsg("t_u0_0002_40"), hostMsg(), standalone(SWALLOWED), assistantMsg("t_a0_0003_60")]; + const carriedBefore = predecessor.some( + (m) => m.role === "system" && m.content.some((b) => b.text === extra.slice(2)), + ); + assert.ok( + carriedBefore, + "the EXTENDED remainder is byte-identical to a standalone message of the earlier request", + ); +}); + +test("a suppression on the RESET path is DECLARED, not only counted", () => { + // DEFINITION (written before the assertion, and taken from the consumer, not + // from the code under test): `stats.suppressions` is the extension's own + // report of which INCOMING indices it deliberately did not forward. + // tools/replay.mjs reads it in two gates — safetyViolation() filters those + // indices out of the input side before comparing lengths, and + // conservationViolations() accepts a missing unit only when it is "part of a + // DECLARED suppression (stats.suppressions ... never a re-derived 'looks + // dropped' guess)". A suppression that is counted but not declared is + // therefore invisible to both, and the gate reports a designed behaviour as + // corruption — the check-fires-on-a-non-defect failure that trains a reader + // to ignore red. + // + // Measured red before the fix, replaying capture s-77fe2779 requests 0..101 + // of conversation e7394e05 with the SERVING gate set: + // safety violations: 1 — n=73 length: 124 -> 123 + // conservation: 1 — n=73 lost: in[98] (system) + // insertion stats: suppressed: 1, suppressions: [] + // The reset path (059aae3) added the suppression without its declaration; + // test/insertion-suppression-on-reset.test.mjs asserts the COUNT, which has + // the same parentage as the code and so pinned the gap in place. + const canon = pinCanon([hostMsg(), assistantMsg("a1"), userMsg("u2"), assistantMsg("a2")]); + const incoming = [ + userMsg("t_host_0001_120"), // the reminder migrated out of the host + standalone(HOOK_INNER), // ... into this standalone: suppressible + userMsg("u2"), // reordered ahead of a1 -> not-subsequence + assistantMsg("a1"), + assistantMsg("a2"), + userMsg("tail"), + ]; + const r = classifyPinned(incoming, canon); + + assert.equal(r.action, "reset", "precondition: the reset path"); + assert.equal(r.suppressed, 1, "precondition: one suppression happened"); + assert.deepEqual( + r.suppressions, + [{ index: 1, hash: r.suppressions?.[0]?.hash }], + "the suppressed INCOMING index must be declared, not just counted", + ); + assert.equal(typeof r.suppressions[0].hash, "string", "the declaration carries the matched hash"); +}); + +test("count and declaration can never disagree, on either path", () => { + // The invariant behind the gap: two reports of one fact. Asserted on both + // paths so a future edit to either cannot re-open it on one of them. + const canon = pinCanon([hostMsg(), assistantMsg("a1"), userMsg("u2"), assistantMsg("a2")]); + + const resetIncoming = [ + userMsg("t_host_0001_120"), standalone(HOOK_INNER), + userMsg("u2"), assistantMsg("a1"), assistantMsg("a2"), userMsg("tail"), + ]; + const reset = classifyPinned(resetIncoming, canon); + assert.equal(reset.action, "reset"); + assert.equal(reset.suppressed, reset.suppressions.length, "reset path: count === declared"); + + const successIncoming = [ + userMsg("t_host_0001_120"), standalone(HOOK_INNER), + assistantMsg("a1"), userMsg("u2"), assistantMsg("a2"), userMsg("tail"), + ]; + const success = classifyPinned(successIncoming, canon); + assert.notEqual(success.action, "reset", "precondition: the non-reset path"); + assert.equal(success.suppressed, success.suppressions.length, "success path: count === declared"); +}); + +test("the merged standalone is NOT suppressed today — the class is still open", () => { + // The EXTENDED merge is outside the current suppression predicate + // (findSuppressibleDuplicate matches wrapper-stripped bytes EXACTLY), so the + // 716ch message goes out on the wire beside the restored inline form and the + // prefix breaks at the host. Pinned here as the class's OPEN state: when an + // absorption ships, this test is the one that must be rewritten, and the + // rewrite is the signal that the wire shape changed. + const canon = pinCanon([hostMsg(), assistantMsg("a1"), standalone(SWALLOWED), userMsg("u2")]); + const incoming = [ + userMsg("t_host_0001_120"), + standalone(MERGED), // reminder + the swallowed standalone, joined + assistantMsg("a1"), + userMsg("u2"), + userMsg("tail"), + ]; + const r = classifyPinned(incoming, canon); + assert.equal(r.suppressed ?? 0, 0, "an EXTENDED merge matches nothing pinned"); + const texts = (r.messages ?? incoming).flatMap((m) => + (Array.isArray(m.content) ? m.content : []).map((b) => b.text)); + assert.ok(texts.includes(MERGED), "so CC's merged form is forwarded as-is"); + assert.ok(texts.includes(HOOK_BLOCK), "beside the pinned inline copy of its prefix"); +}); diff --git a/test/fixtures/harvested/flap-s-0dc8ac87c43d-86.json b/test/fixtures/harvested/flap-s-0dc8ac87c43d-86.json new file mode 100644 index 00000000..d476b9c3 --- /dev/null +++ b/test/fixtures/harvested/flap-s-0dc8ac87c43d-86.json @@ -0,0 +1,7197 @@ +{ + "_what": "CC#76606-family FLAP evidence (threat-matrix Row 4 datapoint, 2026-07-30, 221k bust): the hook-reminder set of ONE user message migrating inline->standalone->inline->standalone across four main-thread requests in 11 seconds, session s-0dc8ac87c43d. Full message arrays for the four requests of the three flap pairs (n=102->104, 104->105, 105->108), so both the SUPPRESSION relations and the reset decision are reproducible offline.", + "_sanitization": "Rebuilt 2026-07-31 from the live capture through scrubMessage — a FULL re-scrub, not a patch of the committed bytes, which had been produced by the pre-bffcb05 whole-text scrubber and kept the participating hook reminder texts RAW. Raw retention is no longer necessary: scrubText is a homomorphism over '\\n\\n' since bffcb05, so the JOIN relation this fixture exists for survives tokenization. The three merged messages (msg86, msg91, msg94) are re-joined from the SANITIZED constituents — the reset-move fixture's documented method — and asserted byte-equal to the plain scrub of the merged string, which is the homomorphism made into a check. tools/harvest.mjs scrubMessage + rebaseTimestamps (one scrubber, no second path). TOKENIZED: every text, per '\\n\\n' segment, as t__, with WRAPPERS surviving verbatim around a tokenized inner text; nested payloads (block.data, block.source.data, any >64-char string under source) as data_; thinking signatures as sig_; conversation keys and sids as s-, the same token this file's NAME carries. REBASED: every timestamp onto 2000-01-01T00:00:00.000Z + its original delta from this fixture's earliest instant. PRESERVED — this is what the fixture is FOR: equality of equal texts, the '\\n\\n' join and paragraph-prefix relations (scrubText is a homomorphism over '\\n\\n' since bffcb05), tool_use_id/id pairing, message and block ordering, timestamp ordering and spacing. RESIDUAL, accepted (operator ruling 2026-07-31, local operator-controlled traffic): token lengths, paragraph counts, intra-fixture timing deltas. This note is a CLAIM; test/harvest-scrub-relations.test.mjs walks this file and re-checks each absence class mechanically.", + "_legs": "INLINE leg (n=102, n=105): msg85 carries four blocks (Pre/Post Agent pair, twice); msg89 and msg92 each carry one 720-char PreToolUse:Edit reminder; msg90 is a standalone system string (the 421-char task-tools nudge). STANDALONE leg (n=104, n=108): msg86 = the JOIN of msg85's four blocks unwrapped, '\\n\\n'-separated (1256 chars); msg91 = a CROSS-MESSAGE join, msg89's unwrapped reminder + '\\n\\n' + msg90's whole standalone string (1106 chars); msg94 = msg92's unwrapped reminder alone (683 chars).", + "_measured": "Against the shipped extension (verified by execution, not by reading): findSuppressibleDuplicate already matches msg86 (join-hash, 78940a0) and msg94 (per-block hash, pre-existing) — but classifyPinned returns reset('edit-shaped') BEFORE the suppression pass runs, so neither fires. The unmatched one is msg91: no hash set covers a join spanning TWO source messages, and its arrival in the gap left by dropped msg90 is what makes the edit-shaped test true.", + "requests": [ + { + "n": 102, + "ts": "2000-01-01T00:00:00.000Z", + "msgCount": 97, + "messages": [ + { + "role": "user", + "content": [ + { + "type": "text", + "text": "\nt_39803a42ea28_275\n\nt_0fdd92602e3a_92\n\nt_9cff0e5ed719_21\n\nt_834a2f8cee71_216\n\nt_20cf2d0f2c93_23\n\nt_bd7927ff18c5_1181\n\nt_7028959dca36_20\n\nt_5d3d46b3f04a_171\n\nt_62d13cdf9484_5208\n\nt_cf50ce91b07e_26\n\nt_0808c4d52e80_2720\n\nt_4e25972b40f2_57\n\nt_87b9d6c12b92_2758\n\nt_50d60bd45af2_52\n\nt_5cb2a91f3cb2_645\n\nt_1949f3f992ff_37\n\nt_090a6c59e845_2777\n\nt_3e7364b7823b_31\n\nt_c8d961778cbf_754\n\nt_480e3d084153_184\n\nt_632fd8a627bc_81\n\nt_375fef3542d3_4260\n\nt_866e2195ac0a_250\n\nt_950bcec5ce0f_45\n\nt_d9960bd733b4_295\n\nt_d74ea1f7e1ba_113\n\nt_b2965485a8d9_35\n\nt_72e2f581ae17_15\n\nt_d16773ab44f3_1056\n\nt_0dea4870efe6_22\n\nt_4829996ca677_417\n\nt_c3e6abfcad01_1322\n\nt_a327b5afddc6_18\n\nt_961f3af3aa00_1216\n\nt_d7262e546b0f_12\n\nt_b2c1745603a7_242\n\nt_ebe70977ace5_227\n\nt_c9b5847c1c50_536\n\nt_a6b982b139d7_1742\n\nt_ef0321c92c2c_14\n\nt_70a44b8429b6_543\n\nt_935dd987a4d1_19\n\nt_0cb264f50d99_196\n\nt_bb6ef070ba06_43\n\nt_174a79f2ff94_319\n\nt_68cdf212dc0c_312\n\nt_7d0668618183_842\n\nt_418e97c85afc_264\n\nt_785841fbd410_23\n\nt_3461a48a0013_74\n\nt_346635aac87a_34\n\nt_b63c5fcec369_296\n\nt_2837bc1441da_31\n\nt_8cfabd736e67_493\n\nt_0611f45cbb35_455\n\nt_8229da415df4_52\n\nt_b78ff30bf7c5_446\n\nt_853b647c40f8_569\n\nt_d4b3b7fcb14d_23\n\nt_44b24288361e_74\n\nt_55b9623a86c1_262\n\nt_9e14b80dc742_208\n\nt_4c105217076e_209\n\nt_166cb04271b0_223\n\nt_3ea9abc6a250_123\n\nt_d80ffd8801d4_45\n\nt_f4f807a15572_194\n\nt_723ca619bd37_40\n\nt_2e0a20abcf1b_384\n\nt_d31e0024d859_671\n\nt_ab0fafab8d57_45\n\nt_76c018ed2b7c_351\n\nt_dfc1ffaf12f2_20\n\nt_a7999f4b819f_948\n\nt_434f828da83c_63\n\nt_8bd8ba9cc25e_649\n\nt_ab44e88273d4_13\n\nt_6b1add496bc9_322\n\nt_2d53c9932baa_153\n" + }, + { + "type": "text", + "text": "t_1167c2e38a9b_79\n\nt_739121e97982_455\n\nt_1653b71c949e_249\n\nt_16084a136117_165\n\nt_cf5052ea8c65_233\n\nt_2face2aa0d72_94\n\nt_d60d61b20c34_42\n\nt_07f0e7d182a9_497\n\nt_7ddac53d1c14_649\n\nt_c78d15c15590_262\n\nt_bc92e0e35c9a_14\n\nt_a692fa4b4493_412\n\nt_f7f4ec7693a3_151\n\nt_d9c5848759ff_148" + } + ] + }, + { + "role": "system", + "content": "t_8bfeabb79650_7273\n\nt_842abe572e7c_2507\n\nt_cf036b47f148_315\n\nt_23599af8b0fb_297\n\nt_2845234799f7_635\n\nt_57f52d5b8f10_341\n\nt_a9e2dc22e530_273\n\nt_48f51b626450_616\n\nt_d73f13a727ea_338\n\nt_979c5f8736eb_264\n\nt_4e2439fdc55c_749\n\nt_4965b25f1f82_133\n\nt_49ecbf8d43ed_25\n\nt_978aac218b24_94\n\nt_fb7a93a1d3a9_148\n\nt_0889357805de_136\n\nt_eb456467931b_63\n\nt_6f974e99f242_18555" + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_2c44cfe246" + }, + { + "type": "text", + "text": "t_e86fd4542781_210" + }, + { + "type": "tool_use", + "id": "toolu_01UVjTNet3SY8wAy1SJ5kksr", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_01ECvUkGP1stvkWQQmuHmjud", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "tool_use_id": "toolu_01UVjTNet3SY8wAy1SJ5kksr", + "type": "tool_result", + "content": "t_62cea8416e57_120\n\nt_feaae20f423b_328\n\nt_f98fb478f24f_185\n\nt_cff46e2d62a9_138\n\nt_7edbbbe95bc4_127\n\nt_72718b1cd2f1_126", + "is_error": false + }, + { + "tool_use_id": "toolu_01ECvUkGP1stvkWQQmuHmjud", + "type": "tool_result", + "content": "t_a4149ac53725_293", + "is_error": false + } + ] + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_6e3ef17afd" + }, + { + "type": "text", + "text": "t_ef3ba9277d80_280\n\nt_3c48a9d293f0_184\n\nt_44b63271c02e_1327\n\nt_9704c998081e_549\n\nt_770b4fa3928f_442\n\nt_ef1d299e7a9c_764\n\nt_edc819bbe4cf_372\n\nt_5a5f40b05261_193" + } + ] + }, + { + "role": "user", + "content": "t_b9bf1eb15cb9_9" + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_3b3a33e250" + }, + { + "type": "tool_use", + "id": "toolu_01AHaH1LdSqqLc7eYz1Wmb56", + "name": "Skill", + "input": { + "skill": "REDACTED", + "args": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "type": "tool_result", + "tool_use_id": "toolu_01AHaH1LdSqqLc7eYz1Wmb56", + "content": "t_353404538812_38" + }, + { + "type": "text", + "text": "t_92cfcf2be79b_112\n\nt_f371e8dcf031_12\n\nt_efcf40ebe81d_409\n\nt_3f49affcb685_16\n\nt_9e2e4350d605_253\n\nt_362ff15ef4c4_12\n\nt_cdf6c9f3ca5f_291\n\nt_9e64b47424fc_439\n\nt_d00a01bf6f16_15\n\nt_10625c50413c_126\n\nt_ae9d898f4858_206\n\nt_f48ce0fde26d_199\n\nt_0e1111344e75_411\n\nt_9acd3d856908_1643\n\nt_b97265e70aa4_1218\n\nt_86cd6a8de0f9_1135\n\nt_9bc539b31df5_984\n\nt_79abde65ce5a_841\n\nt_a151d592c7be_12\n\nt_89dfa2a6d274_88\n\nt_aea2ac35a1b6_406\n\nt_f3f173976d49_8\n\nt_de9c9d9fd63b_1006\n\nt_a29d3c5e84a6_379\n\nt_8d719fb53fd5_178\n\nt_a874f1ae6c66_2341\n\nt_43f71a110f12_108\n\nt_5a98534108ac_91\n\nt_7f330ce38aab_518\n\nt_3a194b515a2d_451\n\nt_5e0e168ce77d_318\n\nt_d1887f2941e3_944\n\nt_c54031ab3021_16\n\nt_6506e60535e9_600\n\nt_bd485660707c_114\n\nt_d5226768de0e_525\n\nt_51b3ae2a9826_197\n\nt_a6ab1568d399_149\n\nt_27e04addce6e_2065\n\nt_a9971f315b37_29\n\nt_49f72bc34f81_286\n\nt_26e894d2474f_296\n\nt_a4ecb670c114_19\n\nt_5a9e32202da8_346\n\nt_37415c8746e0_500" + } + ] + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_630602b348" + }, + { + "type": "text", + "text": "t_4f4f8ba5474d_98" + }, + { + "type": "tool_use", + "id": "toolu_01DhbM7Vy8HCye6ZDJt5RuMX", + "name": "Read", + "input": { + "file_path": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_01CVAx3BGmPCrvZX7hzgGXx8", + "name": "Read", + "input": { + "file_path": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_011ZC5XTurEdcuL15ptGFfzZ", + "name": "Read", + "input": { + "file_path": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "tool_use_id": "toolu_01DhbM7Vy8HCye6ZDJt5RuMX", + "type": "tool_result", + "content": "t_f8c38234bd90_26875" + }, + { + "tool_use_id": "toolu_01CVAx3BGmPCrvZX7hzgGXx8", + "type": "tool_result", + "content": "t_c3f381282ae1_23439" + }, + { + "tool_use_id": "toolu_011ZC5XTurEdcuL15ptGFfzZ", + "type": "tool_result", + "content": "t_18ebffc637a9_10671" + } + ] + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_ad123e9348" + }, + { + "type": "text", + "text": "t_f39f8df20d04_106" + }, + { + "type": "tool_use", + "id": "toolu_01KiweWxXLBWfWmSXvPkij7i", + "name": "Read", + "input": { + "file_path": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_01CywwDBtP6WpCyxLXwaeq8z", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "tool_use_id": "toolu_01KiweWxXLBWfWmSXvPkij7i", + "type": "tool_result", + "content": "t_daf4df1ad37d_27665" + }, + { + "tool_use_id": "toolu_01CywwDBtP6WpCyxLXwaeq8z", + "type": "tool_result", + "content": "t_dd343ee5fd68_24", + "is_error": false + } + ] + }, + { + "role": "system", + "content": "t_d7b1e0351111_421" + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_6b0efed20c" + }, + { + "type": "thinking", + "thinking": "", + "signature": "sig_d323651d84" + }, + { + "type": "tool_use", + "id": "toolu_01P75d8fkQvGpoirjpc3Le1o", + "name": "Read", + "input": { + "file_path": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_01HKQ3Zao6Sfp11WAxKvyVrq", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "tool_use_id": "toolu_01P75d8fkQvGpoirjpc3Le1o", + "type": "tool_result", + "content": "t_26f562734003_15916" + }, + { + "tool_use_id": "toolu_01HKQ3Zao6Sfp11WAxKvyVrq", + "type": "tool_result", + "content": "t_4cdd74c31722_115", + "is_error": false + } + ] + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_6d8c256f31" + }, + { + "type": "thinking", + "thinking": "", + "signature": "sig_a79cc7f97a" + }, + { + "type": "tool_use", + "id": "toolu_0127ZrKyDXWAXAMtm5kTgRdQ", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_01PVZY8CmzpojK2QkL44nDDz", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "tool_use_id": "toolu_0127ZrKyDXWAXAMtm5kTgRdQ", + "type": "tool_result", + "content": "t_8f4b5f4bdeec_75\n\nt_fa009a9afe96_218", + "is_error": false + }, + { + "tool_use_id": "toolu_01PVZY8CmzpojK2QkL44nDDz", + "type": "tool_result", + "content": "t_a16be64fb9ab_508", + "is_error": false + } + ] + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_c4a6d24ff4" + }, + { + "type": "tool_use", + "id": "toolu_01A9obC5sahrxuKKgHCDX8At", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_01Lz66FPgaYRqkC39Nm9dHRr", + "name": "Read", + "input": { + "file_path": "REDACTED", + "offset": "REDACTED", + "limit": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "tool_use_id": "toolu_01A9obC5sahrxuKKgHCDX8At", + "type": "tool_result", + "content": "t_c338563ea271_52", + "is_error": false + }, + { + "tool_use_id": "toolu_01Lz66FPgaYRqkC39Nm9dHRr", + "type": "tool_result", + "content": "t_50c2f9ff816f_6293" + } + ] + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_90ec135600" + }, + { + "type": "thinking", + "thinking": "", + "signature": "sig_d561c4eaf7" + }, + { + "type": "tool_use", + "id": "toolu_01FU1TUqjr8Y815aSoWZNxxJ", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_01RwgLYfgXUrQbkV9GDk5o29", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "tool_use_id": "toolu_01FU1TUqjr8Y815aSoWZNxxJ", + "type": "tool_result", + "content": "t_6d24ca1fcf74_1143", + "is_error": false + }, + { + "tool_use_id": "toolu_01RwgLYfgXUrQbkV9GDk5o29", + "type": "tool_result", + "content": "t_ad21296e612a_28342", + "is_error": false + } + ] + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_e23d5694ac" + }, + { + "type": "thinking", + "thinking": "", + "signature": "sig_71be1cd3b4" + }, + { + "type": "tool_use", + "id": "toolu_01GGYT9CDweDYjRnxYnzxGyq", + "name": "Bash", + "input": 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diff --git a/test/fixtures/harvested/harvested-replace-edit-s-157bd37224d7-20.jsonl b/test/fixtures/harvested/harvested-replace-edit-s-157bd37224d7-20.jsonl new file mode 100644 index 00000000..f419ec20 --- /dev/null +++ b/test/fixtures/harvested/harvested-replace-edit-s-157bd37224d7-20.jsonl @@ -0,0 +1,2 @@ +{"ts":"2000-01-01T00:00:00.000Z","sid":"s-7f72c8d518d9","key":"s-157bd37224d7","headers":{"anthropic-beta":"claude-code-20250219,oauth-2025-04-20,interleaved-thinking-2025-05-14,redact-thinking-2026-02-12,thinking-token-count-2026-05-13,context-management-2025-06-27,prompt-caching-scope-2026-01-05,mid-conversation-system-2026-04-07,advisor-tool-2026-03-01,advanced-tool-use-2025-11-20,effort-2025-11-24,cache-diagnosis-2026-04-07"},"body":{"model":"claude-sonnet-5","system":[{"type":"text","text":"t_0d7062851dd7_62","cache_control":{"type":"ephemeral"}},{"type":"text","text":"t_b9b600fc1061_11753","cache_control":{"type":"ephemeral"}}],"tools":[{"name":"Agent"},{"name":"Artifact"},{"name":"Bash"},{"name":"Edit"},{"name":"Read"},{"name":"Skill"},{"name":"ToolSearch"},{"name":"DeferredToolPlaceholder"},{"name":"Write"}],"messages":[{"role":"user","content":[{"type":"text","text":"\nREDACTED\n"},{"type":"text","text":"t_5a7c0b20ebdc_2424"}]},{"role":"system","content":"\nREDACTED\n"},{"role":"assistant","content":[{"type":"thinking","thinking":"","signature":"sig_17f627c75e"},{"type":"tool_use","id":"toolu_01XXH54TUoVrVK25kVWZ7SzH","name":"Bash","input":{"command":"REDACTED","description":"REDACTED"},"caller":{"type":"direct"}}]},{"role":"user","content":[{"type":"tool_result","content":"t_bd2c8e662266_179","is_error":true,"tool_use_id":"toolu_01XXH54TUoVrVK25kVWZ7SzH"}]},{"role":"system","content":[{"type":"text","text":"\nREDACTED\n","cache_control":{"type":"ephemeral"}}]}]}} +{"ts":"2000-01-01T00:00:04.193Z","sid":"s-7f72c8d518d9","key":"s-157bd37224d7","headers":{"anthropic-beta":"claude-code-20250219,oauth-2025-04-20,interleaved-thinking-2025-05-14,redact-thinking-2026-02-12,thinking-token-count-2026-05-13,context-management-2025-06-27,prompt-caching-scope-2026-01-05,mid-conversation-system-2026-04-07,advisor-tool-2026-03-01,advanced-tool-use-2025-11-20,effort-2025-11-24,cache-diagnosis-2026-04-07"},"body":{"model":"claude-sonnet-5","system":[{"type":"text","text":"t_0d7062851dd7_62","cache_control":{"type":"ephemeral"}},{"type":"text","text":"t_b9b600fc1061_11753","cache_control":{"type":"ephemeral"}}],"tools":[{"name":"Agent"},{"name":"Artifact"},{"name":"Bash"},{"name":"Edit"},{"name":"Read"},{"name":"Skill"},{"name":"ToolSearch"},{"name":"DeferredToolPlaceholder"},{"name":"Write"}],"messages":[{"role":"user","content":[{"type":"text","text":"\nREDACTED\n"},{"type":"text","text":"t_5a7c0b20ebdc_2424"}]},{"role":"system","content":"\nREDACTED\n"},{"role":"assistant","content":[{"type":"thinking","thinking":"","signature":"sig_17f627c75e"},{"type":"tool_use","id":"toolu_01XXH54TUoVrVK25kVWZ7SzH","name":"Bash","input":{"command":"REDACTED","description":"REDACTED"},"caller":{"type":"direct"}}]},{"role":"user","content":[{"type":"tool_result","content":"t_bd2c8e662266_179","is_error":true,"tool_use_id":"toolu_01XXH54TUoVrVK25kVWZ7SzH"}]},{"role":"system","content":"\nREDACTED\n"},{"role":"assistant","content":[{"type":"thinking","thinking":"","signature":"sig_135b004dc4"},{"type":"tool_use","id":"toolu_01LNt6cSqifNLxZp9xeEfTmA","name":"Agent","input":{"description":"REDACTED","subagent_type":"REDACTED","prompt":"REDACTED"},"caller":{"type":"direct"}}]},{"role":"user","content":[{"type":"tool_result","content":"t_681d24b954c1_425","is_error":true,"tool_use_id":"toolu_01LNt6cSqifNLxZp9xeEfTmA","cache_control":{"type":"ephemeral"}}]}]}} diff --git a/test/fixtures/harvested/harvested-splice-insert-mid-s-157bd37224d7-19.jsonl b/test/fixtures/harvested/harvested-splice-insert-mid-s-157bd37224d7-19.jsonl new file mode 100644 index 00000000..64c7e3f7 --- /dev/null +++ b/test/fixtures/harvested/harvested-splice-insert-mid-s-157bd37224d7-19.jsonl @@ -0,0 +1,2 @@ +{"ts":"2000-01-01T00:00:00.000Z","sid":"s-7f72c8d518d9","key":"s-157bd37224d7","headers":{"anthropic-beta":"claude-code-20250219,oauth-2025-04-20,interleaved-thinking-2025-05-14,redact-thinking-2026-02-12,thinking-token-count-2026-05-13,context-management-2025-06-27,prompt-caching-scope-2026-01-05,mid-conversation-system-2026-04-07,advisor-tool-2026-03-01,advanced-tool-use-2025-11-20,effort-2025-11-24,cache-diagnosis-2026-04-07"},"body":{"model":"claude-sonnet-5","system":[{"type":"text","text":"t_0d7062851dd7_62","cache_control":{"type":"ephemeral"}},{"type":"text","text":"t_b9b600fc1061_11753","cache_control":{"type":"ephemeral"}}],"tools":[{"name":"Agent"},{"name":"Artifact"},{"name":"Bash"},{"name":"Edit"},{"name":"Read"},{"name":"Skill"},{"name":"ToolSearch"},{"name":"DeferredToolPlaceholder"},{"name":"Write"}],"messages":[{"role":"user","content":[{"type":"text","text":"\nREDACTED\n"},{"type":"text","text":"t_5a7c0b20ebdc_2424"}]},{"role":"system","content":[{"type":"text","text":"\nREDACTED\n","cache_control":{"type":"ephemeral"}}]}]}} +{"ts":"2000-01-01T00:00:07.876Z","sid":"s-7f72c8d518d9","key":"s-157bd37224d7","headers":{"anthropic-beta":"claude-code-20250219,oauth-2025-04-20,interleaved-thinking-2025-05-14,redact-thinking-2026-02-12,thinking-token-count-2026-05-13,context-management-2025-06-27,prompt-caching-scope-2026-01-05,mid-conversation-system-2026-04-07,advisor-tool-2026-03-01,advanced-tool-use-2025-11-20,effort-2025-11-24,cache-diagnosis-2026-04-07"},"body":{"model":"claude-sonnet-5","system":[{"type":"text","text":"t_0d7062851dd7_62","cache_control":{"type":"ephemeral"}},{"type":"text","text":"t_b9b600fc1061_11753","cache_control":{"type":"ephemeral"}}],"tools":[{"name":"Agent"},{"name":"Artifact"},{"name":"Bash"},{"name":"Edit"},{"name":"Read"},{"name":"Skill"},{"name":"ToolSearch"},{"name":"DeferredToolPlaceholder"},{"name":"Write"}],"messages":[{"role":"user","content":[{"type":"text","text":"\nREDACTED\n"},{"type":"text","text":"t_5a7c0b20ebdc_2424"}]},{"role":"system","content":"\nREDACTED\n"},{"role":"assistant","content":[{"type":"thinking","thinking":"","signature":"sig_17f627c75e"},{"type":"tool_use","id":"toolu_01XXH54TUoVrVK25kVWZ7SzH","name":"Bash","input":{"command":"REDACTED","description":"REDACTED"},"caller":{"type":"direct"}}]},{"role":"user","content":[{"type":"tool_result","content":"t_bd2c8e662266_179","is_error":true,"tool_use_id":"toolu_01XXH54TUoVrVK25kVWZ7SzH"}]},{"role":"system","content":[{"type":"text","text":"\nREDACTED\n","cache_control":{"type":"ephemeral"}}]}]}} diff --git a/test/fixtures/harvested/oscillation-s-4b6a435234bf-863.json b/test/fixtures/harvested/oscillation-s-4b6a435234bf-863.json new file mode 100644 index 00000000..0a020db4 --- /dev/null +++ b/test/fixtures/harvested/oscillation-s-4b6a435234bf-863.json @@ -0,0 +1 @@ +{"_what":"CC#76606-family OSCILLATION evidence, SANITIZED bytes: message[863] (Agent-spawn tool_result, sonnet-queue-recon) across 8 consecutive requests a 148-second window, flipping between hook-reminders-inline and stripped forms. Selected by TIMESTAMP from the live capture (ordinal selection failed twice: capture growth + divergent numbering schemes).","_doc":"MEASURED MINIMUM, with its number, as the fixture-strategy rule requires when a fixture resists the >=10x cut (docs/directives/insertion-normalization-identity-directive.md). This file was never a harvester range dump: harvest already narrowed it to two messages per request (msg863, msg864, out of ~920). All 13 records are load-bearing — the 8 msg863 records ARE the oscillation (5 inline, 3 stripped, in wire order with their timing deltas; dropping the repeats would change the flip count the census reads off this file, 3 rows / 2 flaps per docs/code-reviews/census-flap-joined-report.md), and the 5 msg864 records carry the same flip on the standalone side. Evidence payload 3645 bytes, sanitization claim 2217 more; the only reduction left was whitespace, so the cut is 1.1x, not 10x.","_sanitization":"Rebuilt 2026-07-31. This fixture was committed RAW end to end (its own header said so): operator hook prose, an agent tool_result naming a sub-agent and its session, and two thinking-block signatures of 1170 and 531 base64 chars. Every message now goes through scrubMessage. The MERGED standalone (msg864, role system) is re-joined from the SANITIZED constituents — msg863's two wrapper-stripped reminders — and asserted byte-equal to the plain scrub of the merged string, so the join-hash relation this fixture exists for is carried by construction. tools/harvest.mjs scrubMessage + rebaseTimestamps (one scrubber, no second path). TOKENIZED: every text, per '\\n\\n' segment, as t__, with WRAPPERS surviving verbatim around a tokenized inner text; nested payloads (block.data, block.source.data, any >64-char string under source) as data_; thinking signatures as sig_; conversation keys and sids as s-, the same token this file's NAME carries. REBASED: every timestamp onto 2000-01-01T00:00:00.000Z + its original delta from this fixture's earliest instant. PRESERVED — this is what the fixture is FOR: equality of equal texts, the '\\n\\n' join and paragraph-prefix relations (scrubText is a homomorphism over '\\n\\n' since bffcb05), tool_use_id/id pairing, message and block ordering, timestamp ordering and spacing. RESIDUAL, accepted (operator ruling 2026-07-31, local operator-controlled traffic): token lengths, paragraph counts, intra-fixture timing deltas. This note is a CLAIM; test/harvest-scrub-relations.test.mjs walks this file and re-checks each absence class mechanically.","_merge_standalone":"msg864 across the same window: CC's MERGED standalone — both hook reminders wrapper-stripped, joined with \\n\\n (627 raw chars), role system; the suppression gap's real shape","requests":[{"ts":"2000-01-01T00:00:00.000Z","msgCount":913,"msg863":{"role":"user","content":[{"tool_use_id":"toolu_012R3rh89mR9guctAZbiaHZe","type":"tool_result","content":[{"type":"text","text":"t_c7b26e448190_289"}]},{"type":"text","text":"\nt_d1d8fb876c64_349\n"},{"type":"text","text":"\nt_be53f4f44125_276\n"}]}},{"ts":"2000-01-01T00:00:28.418Z","msgCount":916,"msg863":{"role":"user","content":[{"tool_use_id":"toolu_012R3rh89mR9guctAZbiaHZe","type":"tool_result","content":[{"type":"text","text":"t_c7b26e448190_289"}]},{"type":"text","text":"\nt_d1d8fb876c64_349\n"},{"type":"text","text":"\nt_be53f4f44125_276\n"}]}},{"ts":"2000-01-01T00:00:34.938Z","msgCount":918,"msg863":{"role":"user","content":[{"tool_use_id":"toolu_012R3rh89mR9guctAZbiaHZe","type":"tool_result","content":[{"type":"text","text":"t_c7b26e448190_289"}]},{"type":"text","text":"\nt_d1d8fb876c64_349\n"},{"type":"text","text":"\nt_be53f4f44125_276\n"}]}},{"ts":"2000-01-01T00:00:50.701Z","msgCount":920,"msg863":{"role":"user","content":[{"tool_use_id":"toolu_012R3rh89mR9guctAZbiaHZe","type":"tool_result","content":[{"type":"text","text":"t_c7b26e448190_289"}]},{"type":"text","text":"\nt_d1d8fb876c64_349\n"},{"type":"text","text":"\nt_be53f4f44125_276\n"}]}},{"ts":"2000-01-01T00:00:50.898Z","msgCount":921,"msg863":{"role":"user","content":[{"tool_use_id":"toolu_012R3rh89mR9guctAZbiaHZe","type":"tool_result","content":[{"type":"text","text":"t_c7b26e448190_289"}]}]}},{"ts":"2000-01-01T00:00:58.056Z","msgCount":922,"msg863":{"role":"user","content":[{"tool_use_id":"toolu_012R3rh89mR9guctAZbiaHZe","type":"tool_result","content":[{"type":"text","text":"t_c7b26e448190_289"}]},{"type":"text","text":"\nt_d1d8fb876c64_349\n"},{"type":"text","text":"\nt_be53f4f44125_276\n"}]}},{"ts":"2000-01-01T00:02:06.631Z","msgCount":923,"msg863":{"role":"user","content":[{"tool_use_id":"toolu_012R3rh89mR9guctAZbiaHZe","type":"tool_result","content":[{"type":"text","text":"t_c7b26e448190_289"}]}]}},{"ts":"2000-01-01T00:02:28.036Z","msgCount":926,"msg863":{"role":"user","content":[{"tool_use_id":"toolu_012R3rh89mR9guctAZbiaHZe","type":"tool_result","content":[{"type":"text","text":"t_c7b26e448190_289"}]}]}}],"requests_864":[{"ts":"2000-01-01T00:00:50.701Z","msg864":{"role":"assistant","content":[{"type":"thinking","thinking":"","signature":"sig_a9ca36c55c"},{"type":"thinking","thinking":"","signature":"sig_87b5b03e5f"},{"type":"tool_use","id":"toolu_01CWrpni9WFUr3drUrKWs4eF","name":"Read","input":{"file_path":"REDACTED","offset":"REDACTED","limit":"REDACTED"},"caller":{"type":"direct"}}]}},{"ts":"2000-01-01T00:00:50.898Z","msg864":{"role":"system","content":"t_d1d8fb876c64_349\n\nt_be53f4f44125_276"}},{"ts":"2000-01-01T00:00:58.056Z","msg864":{"role":"assistant","content":[{"type":"thinking","thinking":"","signature":"sig_a9ca36c55c"},{"type":"thinking","thinking":"","signature":"sig_87b5b03e5f"},{"type":"tool_use","id":"toolu_01CWrpni9WFUr3drUrKWs4eF","name":"Read","input":{"file_path":"REDACTED","offset":"REDACTED","limit":"REDACTED"},"caller":{"type":"direct"}}]}},{"ts":"2000-01-01T00:02:06.631Z","msg864":{"role":"system","content":"t_d1d8fb876c64_349\n\nt_be53f4f44125_276"}},{"ts":"2000-01-01T00:02:28.036Z","msg864":{"role":"system","content":"t_d1d8fb876c64_349\n\nt_be53f4f44125_276"}}]} diff --git a/test/fixtures/harvested/pinned-s-4b6a435234bf-26-28.json b/test/fixtures/harvested/pinned-s-4b6a435234bf-26-28.json new file mode 100644 index 00000000..43ec0b1a --- /dev/null +++ b/test/fixtures/harvested/pinned-s-4b6a435234bf-26-28.json @@ -0,0 +1 @@ +{"header":{"key":"s-4b6a435234bf","range":{"n":26,"m":28},"replayFrom":26,"note":"MINIMIZED (docs/directives/insertion-normalization-identity-directive.md, \"Fixture strategy\"): records holds capture ordinals replayFrom..m, NOT the full 0..m prefix the pin tool dumps. replayFrom names the capture ordinal of the FIRST request record here, so a consumer numbers its replayed entries from replayFrom (not from 0) and n..m keeps meaning the same pair it always did. The dropped prefix was scaffolding for pin state only: request 26 carries the reminder-bearing message inline, so it establishes the pin by itself. Measured, not assumed — `node tools/fixture-verdict-identity.mjs ` replays both through the real extension pipeline and compares every retained request's verdict (action, resetReason, suppressed, the suppressed indices, in/out lengths, a hash of the FORWARDED messages), every findMitigationGaps row and every findSafetyViolations result. Outcome and boot-gate records are dropped: no consumer of this fixture reads them.","minimized":{"from":{"records":54,"bytes":432264,"replayFrom":0},"droppedOutcomeRecords":24,"measuredFloorReplayFrom":26},"harvestedAt":"2000-01-01T14:22:32.820Z","sanitizer":"tools/harvest.mjs scrubMessage + rebaseTimestamps (one scrubber, no second path). TOKENIZED: every text, per '\\n\\n' segment, as t__, with WRAPPERS surviving verbatim around a tokenized inner text; nested payloads (block.data, block.source.data, any >64-char string under source) as data_; thinking signatures as sig_; conversation keys and sids as s-, the same token this file's NAME carries. REBASED: every timestamp onto 2000-01-01T00:00:00.000Z + its original delta from this fixture's earliest instant. PRESERVED — this is what the fixture is FOR: equality of equal texts, the '\\n\\n' join and paragraph-prefix relations (scrubText is a homomorphism over '\\n\\n' since bffcb05), tool_use_id/id pairing, message and block ordering, timestamp ordering and spacing. RESIDUAL, accepted (operator ruling 2026-07-31, local operator-controlled traffic): token lengths, paragraph counts, intra-fixture timing deltas. 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diff --git a/test/fixtures/harvested/reset-move-s-97097e027ac0-196-197.json b/test/fixtures/harvested/reset-move-s-97097e027ac0-196-197.json new file mode 100644 index 00000000..9f52442c --- /dev/null +++ b/test/fixtures/harvested/reset-move-s-97097e027ac0-196-197.json @@ -0,0 +1,20614 @@ +{ + "_what": "RESET-ABANDONS-MOVE evidence (directive flap-move-mitigation-and-fidelity-gate.md, Unit 2b; commit 0ebbd8a's KNOWN DEFECT note). Capture s-97097e027ac0, requests 187/195/196/197/198 of one conversation. On 195 and 196 insertion-normalization recognizes a cross-message join MOVE and serves the first-seen form; on 197 the subsequence match fails, resetKeepingPins runs, and the move is NOT reapplied — the merged message is forwarded raw again, so our bytes at wire index 223 flip while CC's are identical there. Measured against the full capture under its own boot gates: stability violation n=196->197, inDiv 233, outDiv 225, attributed to insertion-normalization at outDiv 223.", + "_sanitization": "Every message via harvest.mjs scrubMessage. The MERGED message is rebuilt as the '\\n\\n'-join of the SANITIZED constituents (the predecessor's two unwrapped texts, then the absorbed standalone's whole text), so the join relation this fixture exists for survives. Re-scrubbed 2026-07-31: the original commit's claim to keep 'no raw text at all' was FALSE — five image/png blocks carried 13,060 raw base64 chars each at block.source.data, one level below the block.data the scrubber redacted (docs/audits/pr-prep-2026-07-31/pr-prep-report.md gap 1). Those five payloads are now data_ tokens and nothing else in the message arrays moved (asserted block-by-block during the rebuild). tools/harvest.mjs scrubMessage + rebaseTimestamps (one scrubber, no second path). TOKENIZED: every text, per '\\n\\n' segment, as t__, with WRAPPERS surviving verbatim around a tokenized inner text; nested payloads (block.data, block.source.data, any >64-char string under source) as data_; thinking signatures as sig_; conversation keys and sids as s-, the same token this file's NAME carries. REBASED: every timestamp onto 2000-01-01T00:00:00.000Z + its original delta from this fixture's earliest instant. PRESERVED — this is what the fixture is FOR: equality of equal texts, the '\\n\\n' join and paragraph-prefix relations (scrubText is a homomorphism over '\\n\\n' since bffcb05), tool_use_id/id pairing, message and block ordering, timestamp ordering and spacing. RESIDUAL, accepted (operator ruling 2026-07-31, local operator-controlled traffic): token lengths, paragraph counts, intra-fixture timing deltas. This note is a CLAIM; test/harvest-scrub-relations.test.mjs walks this file and re-checks each absence class mechanically.", + "_relation": "P = msg222, a user message carrying two tool_results and two -wrapped hook texts. D = msg223, a standalone system message (the task-tools nudge, string content) — present on 187, gone from 195 onward. N = the merged standalone that replaces it: P's two unwrapped reminders '\\n\\n'-joined, then '\\n\\n', then D's whole text. Structural variant of the flap fixture: there the predecessor pinned ONE wrapped block, here TWO — the same grammar, exercising pinnedReminderText's multi-block join.", + "_mechanism": "MEASURED WHILE BUILDING UNIT 2b, and it refutes 2b's premise for this pair. The reset is a SYMPTOM, not the cause. computePinnedIdentities keys a message as (content-hash, role, occurrence-ordinal-within-the-request). The move keeps the absorbed entry ALIVE in the canonical while CC has stopped sending it, so the entry's ordinal is now a claim about an array CC no longer sends. Executed on this fixture: the absorbed entry is (h=598f08142b3dde9a, role=system, o=7) with its first-seen bytes stored; at n=196 CC's array holds 7 copies of that text (o=0..6), so o=7 is absent, the entry is DROPPED, and the move is recognized. At n=197 CC appends an EIGHTH copy at wire index 236 (a fresh tail reminder, carrying cache_control) — it takes ordinal 7, the canonical entry matches THAT message, and two things follow at once: (1) the entry is no longer in droppedNow, so no move can be recognized by any code on any path — `dropped: 0` on the reset, and (2) the match pairs canonical 223 -> wire 236 against canonical 224 -> wire 224, an inversion, which is what trips not-subsequence. n=399->400 on the same capture is the identical shape and the identical merged-content hash. So applying move recognition on the reset path (unit 2b, built) cannot close this pair: by the time the reset fires there is no dropped entry to re-serve. Closing it is a decision about message IDENTITY (dev-loop: 'an identity computed more cheaply than the thing it identifies will collide'), which touches state keys and therefore restart transparency — above the build unit's scope, returned as a question.", + "_measured": "Against commit 0ebbd8a (unit 2, pre-2b): n=187 reset/no-prior-canonical; n=195 normalized moved=1 suppressions=[{223,join-move}] reserves=[223]; n=196 identical; n=197 reset/not-subsequence moved=0; n=198 normalized moved=0 — and findStabilityViolations over the five returns one violation, 196->197 inDiv=233 outDiv=223.", + "requests": [ + { + "n": 187, + "ts": "2000-01-01T00:00:00.000Z", + "msgCount": 233, + "messages": [ + { + "role": "user", + "content": [ + { + "type": "text", + "text": "\nt_d8d1cd7fb0e6_17834\n" + }, + { + "type": "text", + "text": "t_bc3bb3bbc882_180" + } + ] + }, + { + "role": "system", + "content": "t_2b19d61393a3_39287" + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_83060c4357" + }, + { + "type": "text", + "text": "t_1f15edfe9476_73" + }, + { + "type": "tool_use", + "id": "toolu_01CzG2nKcYe9v29ZUNk5Ynsq", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_015W37twJw1pxYKPBkUVwWwd", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "tool_use_id": "toolu_01CzG2nKcYe9v29ZUNk5Ynsq", + "type": "tool_result", + "content": "t_d457648df550_287", + "is_error": false + }, + { + "tool_use_id": "toolu_015W37twJw1pxYKPBkUVwWwd", + "type": "tool_result", + "content": "t_4277966c59de_176", + "is_error": false + } + ] + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_15ac258b75" + }, + { + "type": "tool_use", + "id": "toolu_01AL947HzYNqXvHY7pJZDwP9", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_01YGouenmCMAJLqTbd5VBEPJ", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "tool_use_id": "toolu_01AL947HzYNqXvHY7pJZDwP9", + "type": "tool_result", + "content": "t_d1c8a511cb18_20106", + "is_error": false + }, + { + "tool_use_id": "toolu_01YGouenmCMAJLqTbd5VBEPJ", + "type": "tool_result", + "content": "t_c5b2ccd05dab_11656", + "is_error": false + } + ] + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_1516c768f7" + }, + { + "type": "text", + "text": "t_971bd98c2ee9_51" + }, + { + "type": "tool_use", + "id": "toolu_01AQVXUP18Gg6AxvoVXsaKK9", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": "toolu_01J81C1s2Ud5zNb2BmnjNM71", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "tool_use_id": "toolu_01AQVXUP18Gg6AxvoVXsaKK9", + "type": "tool_result", + "content": "t_4df40c17d65e_2724", + "is_error": false + }, + { + "tool_use_id": "toolu_01J81C1s2Ud5zNb2BmnjNM71", + "type": "tool_result", + "content": "t_04c7e03a54b5_19346", + "is_error": false + } + ] + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_ee3786807d" + }, + { + "type": "tool_use", + "id": "toolu_01GwbrfXjEuMW5tFbyEcuatN", + "name": "Bash", + "input": { + "command": "REDACTED", + "description": "REDACTED" + }, + "caller": { + "type": "direct" + } + }, + { + "type": "tool_use", + "id": 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{ + "role": "user", + "content": "\nt_4e80d37290a0_756\n" + }, + { + "role": "assistant", + "content": [ + { + "type": "thinking", + "thinking": "", + "signature": "sig_8dda2fd9c3" + }, + { + "type": "text", + "text": "t_927ff3356e7a_114" + }, + { + "type": "tool_use", + "id": "toolu_01AL39phCmeZ9Z7gqN9f2Jxd", + "name": "SendMessage", + "input": { + "to": "REDACTED", + "summary": "REDACTED", + "message": "REDACTED" + }, + "caller": { + "type": "direct" + }, + "cache_control": { + "type": "ephemeral", + "ttl": "1h" + } + } + ] + }, + { + "role": "user", + "content": [ + { + "type": "tool_result", + "content": "t_20363c90f9a5_30", + "is_error": true, + "tool_use_id": "toolu_01AL39phCmeZ9Z7gqN9f2Jxd" + } + ] + }, + { + "role": "system", + "content": "t_3418bf117fb3_19043" + } + ] + } + ] +} diff --git a/test/fixtures/insertion-1405.json b/test/fixtures/insertion-1405.json new file mode 100644 index 00000000..753dc300 --- /dev/null +++ b/test/fixtures/insertion-1405.json @@ -0,0 +1,33 @@ +{ + "_comment": "Synthetic minimal repro of the 2026-07-27 14:05 splice shape (docs/directives/proxy-insertion-normalization.md). NOT real session content — built by hand for insertion-normalization.test.mjs. `priorMessages` is the 12-entry canonical history from the prior request (arrival order). `incomingMessages` is the NEXT request's messages[] as Claude Code actually sends it: two new user-role entries (a queued operator message and a task-reminder-shaped system-reminder wrapper) spliced in BETWEEN prior canonical index 9 and 10, instead of appended after index 11 where they causally arrived. Expected: classifyInsertion(incomingMessages, canonicalFromPrior) -> action 'normalized', re-serialized to priorMessages (0..11) followed by the two new entries in their incoming relative order (queued-message, then task-reminder).", + "priorMessages": [ + { "role": "user", "content": [{ "type": "text", "text": "turn0-user: investigate the widget cache" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn1-assistant: looking into it" }] }, + { "role": "user", "content": [{ "type": "text", "text": "turn2-user: check the config file" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn3-assistant: config looks fine" }] }, + { "role": "user", "content": [{ "type": "text", "text": "turn4-user: run the test suite" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn5-assistant: tests pass" }] }, + { "role": "user", "content": [{ "type": "text", "text": "turn6-user: add a regression guard" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn7-assistant: guard added" }] }, + { "role": "user", "content": [{ "type": "text", "text": "turn8-user: commit the change" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn9-assistant: committed" }] }, + { "role": "user", "content": [{ "type": "text", "text": "turn10-user: what's next on the roadmap" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn11-assistant: next is the deploy step" }] } + ], + "incomingMessages": [ + { "role": "user", "content": [{ "type": "text", "text": "turn0-user: investigate the widget cache" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn1-assistant: looking into it" }] }, + { "role": "user", "content": [{ "type": "text", "text": "turn2-user: check the config file" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn3-assistant: config looks fine" }] }, + { "role": "user", "content": [{ "type": "text", "text": "turn4-user: run the test suite" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn5-assistant: tests pass" }] }, + { "role": "user", "content": [{ "type": "text", "text": "turn6-user: add a regression guard" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn7-assistant: guard added" }] }, + { "role": "user", "content": [{ "type": "text", "text": "turn8-user: commit the change" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn9-assistant: committed" }] }, + { "role": "user", "content": [{ "type": "text", "text": "queued-message: operator says pause before deploy" }] }, + { "role": "user", "content": [{ "type": "text", "text": "\nThe task tools haven't been used recently.\n" }] }, + { "role": "user", "content": [{ "type": "text", "text": "turn10-user: what's next on the roadmap" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "turn11-assistant: next is the deploy step" }] } + ] +} diff --git a/test/fixtures/replay-classes/corpus-compaction.jsonl b/test/fixtures/replay-classes/corpus-compaction.jsonl new file mode 100644 index 00000000..2bb7b259 --- /dev/null +++ b/test/fixtures/replay-classes/corpus-compaction.jsonl @@ -0,0 +1,2 @@ +{"ts": "2026-07-28T02:00:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "x1"}]}, {"role": "user", "content": [{"type": "text", "text": "x2"}]}, {"role": "assistant", "content": [{"type": "text", "text": "x3"}]}, {"role": "user", "content": [{"type": "text", "text": "x4"}]}, {"role": "assistant", "content": [{"type": "text", "text": "x5"}]}, {"role": "user", "content": [{"type": "text", "text": "x6"}]}, {"role": "assistant", "content": [{"type": "text", "text": "x7"}]}, {"role": "user", "content": [{"type": "text", "text": "x8"}]}, {"role": "assistant", "content": [{"type": "text", "text": "x9"}]}, {"role": "user", "content": [{"type": "text", "text": "x10"}]}, {"role": "assistant", "content": [{"type": "text", "text": "x11"}]}]}} +{"ts": "2026-07-28T02:01:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "user", "content": [{"type": "text", "text": "summary of everything"}]}]}} diff --git a/test/fixtures/replay-classes/corpus-edit.jsonl b/test/fixtures/replay-classes/corpus-edit.jsonl new file mode 100644 index 00000000..be62578b --- /dev/null +++ b/test/fixtures/replay-classes/corpus-edit.jsonl @@ -0,0 +1,2 @@ +{"ts": "2026-07-28T02:00:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "original text"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}]}} +{"ts": "2026-07-28T02:01:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "EDITED text"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}]}} diff --git a/test/fixtures/replay-classes/corpus-flip.jsonl b/test/fixtures/replay-classes/corpus-flip.jsonl new file mode 100644 index 00000000..a8aaaed7 --- /dev/null +++ b/test/fixtures/replay-classes/corpus-flip.jsonl @@ -0,0 +1,3 @@ +{"ts": "2026-07-28T02:00:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "deep"}, {"type": "text", "text": "\nPreToolUse:Edit hook additional context: Spec-origin trace required\n"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}]}} +{"ts": "2026-07-28T02:01:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "deep"}, {"type": "text", "text": "\nPreToolUse:Edit hook additional context: Spec-origin trace required\n"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}, {"role": "user", "content": [{"type": "text", "text": "q"}]}]}} +{"ts": "2026-07-28T02:02:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "deep"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}, {"role": "user", "content": [{"type": "text", "text": "next"}]}]}} diff --git a/test/fixtures/replay-classes/corpus-flipback.jsonl b/test/fixtures/replay-classes/corpus-flipback.jsonl new file mode 100644 index 00000000..47d0d4c2 --- /dev/null +++ b/test/fixtures/replay-classes/corpus-flipback.jsonl @@ -0,0 +1,2 @@ +{"ts": "2026-07-28T02:00:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "target"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}]}} +{"ts": "2026-07-28T02:01:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "target"}, {"type": "text", "text": "\nPreToolUse:Edit hook additional context: Spec-origin trace required\n"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}, {"role": "user", "content": [{"type": "text", "text": "go"}]}]}} diff --git a/test/fixtures/replay-classes/corpus-prune.jsonl b/test/fixtures/replay-classes/corpus-prune.jsonl new file mode 100644 index 00000000..84ed1e10 --- /dev/null +++ b/test/fixtures/replay-classes/corpus-prune.jsonl @@ -0,0 +1,2 @@ +{"ts": "2026-07-28T02:00:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "m1"}]}, {"role": "user", "content": [{"type": "text", "text": "m2"}]}, {"role": "assistant", "content": [{"type": "text", "text": "m3"}]}, {"role": "user", "content": [{"type": "text", "text": "m4"}]}, {"role": "assistant", "content": [{"type": "text", "text": "m5"}]}, {"role": "user", "content": [{"type": "text", "text": "m6"}]}, {"role": "assistant", "content": [{"type": "text", "text": "m7"}]}, {"role": "user", "content": [{"type": "text", "text": "m8"}]}, {"role": "assistant", "content": [{"type": "text", "text": "m9"}]}]}} +{"ts": "2026-07-28T02:01:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "m3"}]}, {"role": "user", "content": [{"type": "text", "text": "m4"}]}, {"role": "assistant", "content": [{"type": "text", "text": "m5"}]}, {"role": "user", "content": [{"type": "text", "text": "m6"}]}, {"role": "assistant", "content": [{"type": "text", "text": "m7"}]}, {"role": "user", "content": [{"type": "text", "text": "m8"}]}, {"role": "assistant", "content": [{"type": "text", "text": "m9"}]}, {"role": "user", "content": [{"type": "text", "text": "tail"}]}]}} diff --git a/test/fixtures/replay-classes/corpus-sidecar.jsonl b/test/fixtures/replay-classes/corpus-sidecar.jsonl new file mode 100644 index 00000000..fa096b9c --- /dev/null +++ b/test/fixtures/replay-classes/corpus-sidecar.jsonl @@ -0,0 +1,3 @@ +{"ts": "2026-07-28T02:00:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "main-0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "main-1"}]}]}} +{"ts": "2026-07-28T02:00:05Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "Generate a concise title", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "give this a title"}]}]}} +{"ts": "2026-07-28T02:00:10Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "main-0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "main-1"}]}, {"role": "user", "content": [{"type": "text", "text": "main-2"}]}]}} diff --git a/test/fixtures/replay-classes/corpus-splice.jsonl b/test/fixtures/replay-classes/corpus-splice.jsonl new file mode 100644 index 00000000..af8265bf --- /dev/null +++ b/test/fixtures/replay-classes/corpus-splice.jsonl @@ -0,0 +1,2 @@ +{"ts": "2026-07-28T02:00:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "u2"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}]}} +{"ts": "2026-07-28T02:01:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "INJECTED"}]}, {"role": "user", "content": [{"type": "text", "text": "u2"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}]}} diff --git a/test/fixtures/replay-classes/corpus-tooladd.jsonl b/test/fixtures/replay-classes/corpus-tooladd.jsonl new file mode 100644 index 00000000..b1ecc96a --- /dev/null +++ b/test/fixtures/replay-classes/corpus-tooladd.jsonl @@ -0,0 +1,4 @@ +{"ts": "2026-07-28T03:00:00Z", "sid": "tooladd-sid", "key": "s-tooladd-sid", "headers": {"anthropic-beta": "context-1m-2025-08-07", "session-id": "tooladd-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "tools": [{"name": "Read", "description": "Read tool", "input_schema": {"type": "object", "properties": {"x": {"type": "string"}}}}, {"name": "Bash", "description": "Bash tool", "input_schema": {"type": "object", "properties": {"x": {"type": "string"}}}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0"}]}]}} +{"ts": "2026-07-28T03:00:10Z", "sid": "tooladd-sid", "key": "s-tooladd-sid", "headers": {"anthropic-beta": "context-1m-2025-08-07", "session-id": "tooladd-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "tools": [{"name": "Read", "description": "Read tool", "input_schema": {"type": "object", "properties": {"x": {"type": "string"}}}}, {"name": "Bash", "description": "Bash tool", "input_schema": {"type": "object", "properties": {"x": {"type": "string"}}}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "u2"}]}]}} +{"ts": "2026-07-28T03:00:20Z", "sid": "tooladd-sid", "key": "s-tooladd-sid", "headers": {"anthropic-beta": "context-1m-2025-08-07", "session-id": "tooladd-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "tools": [{"name": "Read", "description": "Read tool", "input_schema": {"type": "object", "properties": {"x": {"type": "string"}}}}, {"name": "Bash", "description": "Bash tool", "input_schema": {"type": "object", "properties": {"x": {"type": "string"}}}}, {"name": "SendMessage", "description": "SendMessage tool", "input_schema": {"type": "object", "properties": {"x": {"type": "string"}}}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "u2"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}]}} +{"ts": "2026-07-28T03:00:30Z", "sid": "tooladd-sid", "key": "s-tooladd-sid", "headers": {"anthropic-beta": "context-1m-2025-08-07", "session-id": "tooladd-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "tools": [{"name": "Read", "description": "Read tool", "input_schema": {"type": "object", "properties": {"x": {"type": "string"}}}}, {"name": "Bash", "description": "Bash tool", "input_schema": {"type": "object", "properties": {"x": {"type": "string"}}}}, {"name": "SendMessage", "description": "SendMessage tool", "input_schema": {"type": "object", "properties": {"x": {"type": "string"}}}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a1"}]}, {"role": "user", "content": [{"type": "text", "text": "u2"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a3"}]}, {"role": "user", "content": [{"type": "text", "text": "u4"}]}]}} diff --git a/test/fixtures/replay-classes/corpus-toolpair.jsonl b/test/fixtures/replay-classes/corpus-toolpair.jsonl new file mode 100644 index 00000000..8e728e89 --- /dev/null +++ b/test/fixtures/replay-classes/corpus-toolpair.jsonl @@ -0,0 +1,2 @@ +{"ts": "2026-07-28T02:00:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "tool_use", "id": "t1", "name": "Bash", "input": {"command": "ls"}}]}, {"role": "user", "content": [{"type": "tool_result", "tool_use_id": "t1", "content": "ok"}]}, {"role": "user", "content": [{"type": "text", "text": "after tools"}, {"type": "text", "text": "\nPreToolUse:Edit hook additional context: Spec-origin trace required\n"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a"}]}]}} +{"ts": "2026-07-28T02:01:00Z", "sid": "test-sid", "key": "s-test-sid", "headers": {"anthropic-beta": "context-management-2025-06-27", "session-id": "test-sid"}, "body": {"model": "claude-opus-5", "system": [{"type": "text", "text": "sys", "cache_control": {"type": "ephemeral"}}], "messages": [{"role": "user", "content": [{"type": "text", "text": "u0", "cache_control": {"type": "ephemeral"}}]}, {"role": "assistant", "content": [{"type": "tool_use", "id": "t1", "name": "Bash", "input": {"command": "ls"}}]}, {"role": "user", "content": [{"type": "tool_result", "tool_use_id": "t1", "content": "ok"}]}, {"role": "user", "content": [{"type": "text", "text": "after tools"}]}, {"role": "assistant", "content": [{"type": "text", "text": "a"}]}, {"role": "assistant", "content": [{"type": "tool_use", "id": "t2", "name": "Bash", "input": {"command": "ls"}}]}, {"role": "user", "content": [{"type": "tool_result", "tool_use_id": "t2", "content": "ok"}]}]}} diff --git a/test/fixtures/toolgc-1536.json b/test/fixtures/toolgc-1536.json new file mode 100644 index 00000000..bfc24eb2 --- /dev/null +++ b/test/fixtures/toolgc-1536.json @@ -0,0 +1,30 @@ +{ + "_comment": "Synthetic fixture, minimal, built from the ledger SHAPE only (measured 2026-07-27 15:36, ledger row tools:REMOVE, CronCreate removed + DeferredToolPlaceholder reordered, no ToolSearch nearby; skills-update system events in-window) per docs/directives/robustness-threat-matrix.md row 13. Session mirrors were NOT read to build this — only the shape named in the matrix row (a known tool disappearing from tools[] plus an unrelated reorder, both mid-conversation, with no addition).", + "prior": { + "model": "claude-sonnet-4-6", + "system": [{ "type": "text", "text": "You are Claude Code, Anthropic's official CLI for Claude." }], + "messages": [ + { "role": "user", "content": [{ "type": "text", "text": "schedule a cron job" }] } + ], + "tools": [ + { "name": "Read", "input_schema": { "type": "object", "properties": { "file_path": { "type": "string" } } } }, + { "name": "Bash", "input_schema": { "type": "object", "properties": { "command": { "type": "string" } } } }, + { "name": "CronCreate", "input_schema": { "type": "object", "properties": { "schedule": { "type": "string" } } } }, + { "name": "DeferredToolPlaceholder", "input_schema": { "type": "object", "properties": {} } } + ] + }, + "incoming": { + "model": "claude-sonnet-4-6", + "system": [{ "type": "text", "text": "You are Claude Code, Anthropic's official CLI for Claude." }], + "messages": [ + { "role": "user", "content": [{ "type": "text", "text": "schedule a cron job" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "Scheduled." }] }, + { "role": "user", "content": [{ "type": "text", "text": "thanks, what else can you do" }] } + ], + "tools": [ + { "name": "DeferredToolPlaceholder", "input_schema": { "type": "object", "properties": {} } }, + { "name": "Read", "input_schema": { "type": "object", "properties": { "file_path": { "type": "string" } } } }, + { "name": "Bash", "input_schema": { "type": "object", "properties": { "command": { "type": "string" } } } } + ] + } +} diff --git a/test/fixtures/toolload-1247.json b/test/fixtures/toolload-1247.json new file mode 100644 index 00000000..fbdcf58a --- /dev/null +++ b/test/fixtures/toolload-1247.json @@ -0,0 +1,35 @@ +{ + "_comment": "Synthetic fixture, minimal, built from the ledger SHAPE only (measured 2026-07-27 12:47:56, ledger row tools[SendMessage:added], toolsMatch:false) per docs/directives/proxy-deferred-tool-rewrite.md Phase A. Session mirrors were NOT read to build this — only the shape named in the directive (a tools[] array gaining exactly one new entry, SendMessage, mid-conversation).", + "prior": { + "model": "claude-sonnet-4-6", + "system": [{ "type": "text", "text": "You are Claude Code, Anthropic's official CLI for Claude." }], + "messages": [ + { "role": "user", "content": [{ "type": "text", "text": "start a background agent" }] } + ], + "tools": [ + { "name": "Read", "input_schema": { "type": "object", "properties": { "file_path": { "type": "string" } } } }, + { "name": "Bash", "input_schema": { "type": "object", "properties": { "command": { "type": "string" } } } } + ] + }, + "incoming": { + "model": "claude-sonnet-4-6", + "system": [{ "type": "text", "text": "You are Claude Code, Anthropic's official CLI for Claude." }], + "messages": [ + { "role": "user", "content": [{ "type": "text", "text": "start a background agent" }] }, + { "role": "assistant", "content": [{ "type": "text", "text": "Starting a background agent now." }] }, + { "role": "user", "content": [{ "type": "text", "text": "ok, keep going" }] } + ], + "tools": [ + { "name": "Read", "input_schema": { "type": "object", "properties": { "file_path": { "type": "string" } } } }, + { "name": "Bash", "input_schema": { "type": "object", "properties": { "command": { "type": "string" } } } }, + { + "name": "SendMessage", + "description": "Send a message to a teammate agent.", + "input_schema": { + "type": "object", + "properties": { "to": { "type": "string" }, "message": { "type": "string" } } + } + } + ] + } +} diff --git a/test/gate-live.test.mjs b/test/gate-live.test.mjs new file mode 100644 index 00000000..b2773ec1 --- /dev/null +++ b/test/gate-live.test.mjs @@ -0,0 +1,158 @@ +// gate-live — the sweep that runs the real gate over live captures. +// +// It exists because two gate defects (a RangeError on a 955 MB capture, a +// 3.2 GB retention peak) were invisible to `npm test` by construction: the +// committed corpus is harvested for STRUCTURAL NOVELTY and sanitised, so it is +// small on purpose and can never contain a scale-shaped input. +// +// Which means this file cannot test the thing that matters either — only the +// scheduled run against real captures can. What it CAN pin is the reporting: +// that a gate which died is recorded as an error rather than smoothed into a +// clean row, and that a clean sweep needs actual captures behind it. Those are +// the two ways a green verdict could lie. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { summarise, rowIsClean, replayArgs, CHILD_HEAP_CAP_MB } from "../tools/gate-live.mjs"; + +const json = (o) => ({ code: 0, out: JSON.stringify(o), err: "" }); + +test("summarise: a clean gate run reads clean", () => { + const row = summarise("c.jsonl", 100, json({ + report: [{ n: 0 }, { n: 1 }], + violations: [], safety: [], sequence: [], orderViolations: [], + })); + assert.equal(row.requests, 2); + assert.equal(rowIsClean(row), true); +}); + +// The case the job was built for. A gate that CRASHED produces no JSON; if +// that were treated as "no violations found", the sweep would report success +// precisely when the gate ran no checks at all — the exact false green that +// let the RangeError live. +test("BITE — a gate that died is an error, never a clean row", () => { + const row = summarise("big.jsonl", 955_000_000, { + code: 1, + out: "", + err: "replay failed: RangeError: Invalid string length\n at readFileHandle", + }); + assert.ok(row.error, "a crash must be recorded as an error"); + assert.match(row.error, /RangeError/, "the reason must survive into the status file"); + assert.equal(rowIsClean(row), false); + assert.equal(row.stability, undefined, "no violation counts may be invented for a run that produced none"); +}); + +test("BITE — a nonzero exit is not clean even if JSON parsed", () => { + // replay exits non-zero on violations; the counts and the exit code must + // agree, and if they ever disagree the stricter one wins. + const res = json({ report: [{ n: 0 }], violations: [], safety: [], sequence: [], orderViolations: [] }); + res.code = 1; + assert.equal(rowIsClean(summarise("c.jsonl", 10, res)), false); +}); + +test("BITE — each violation class alone is enough to fail the row", () => { + for (const key of ["violations", "safety", "conservation", "sequence", "orderViolations"]) { + const payload = { + report: [{ n: 0 }], violations: [], safety: [], conservation: [], sequence: [], orderViolations: [], + }; + payload[key] = [{ n: 0 }]; + const row = summarise("c.jsonl", 10, json(payload)); + assert.equal(rowIsClean(row), false, `${key} must fail the row on its own`); + } +}); + +test("summarise: unparseable capture lines are counted, not hidden", () => { + const row = summarise("c.jsonl", 10, json({ + report: [{ n: 0 }, { n: 1, error: "unparseable capture line" }], + violations: [], safety: [], sequence: [], orderViolations: [], + })); + assert.equal(row.unparseable, 1); +}); + +test("spawn failure (no node, bad path) is an error row", () => { + const row = summarise("c.jsonl", 10, { code: -1, out: "", err: "spawn ENOENT" }); + assert.equal(rowIsClean(row), false); + assert.match(row.error, /ENOENT/); +}); + +// --- Replay fidelity in the sweep --- + +test("BITE — a fidelity mismatch fails the row, whatever the four gates say", () => { + // The four invariants can all be clean and still describe a system that + // never ran, if the replay did not reproduce the real request. + const row = summarise("c.jsonl", 10, json({ + report: [{ n: 0 }], + violations: [], safety: [], sequence: [], orderViolations: [], + fidelity: { comparable: 3, matched: 2, mismatches: [{ n: 1 }] }, + })); + assert.equal(row.fidelityMismatch, 1); + assert.equal(rowIsClean(row), false, "a mismatch invalidates the other numbers"); +}); + +// The cap is the memory-regression check: a replay that retains its input +// dies against it (proven — the pre-8b7ed9e replay OOMs under it in 5 s on a +// 1.5 GB capture) and becomes an error row. Dropping the flag would disarm +// that check silently; the sweep would go back to passing on a replay whose +// memory grows with the corpus, until the machine's own ceiling ends it. +test("replay children run under the heap cap, before the script path", () => { + const args = replayArgs("c.jsonl", ["CACHE_FIX_PREFIXDIFF=1"]); + const capIdx = args.indexOf(`--max-old-space-size=${CHILD_HEAP_CAP_MB}`); + assert.ok(capIdx >= 0, "heap cap flag missing from child argv"); + assert.ok( + capIdx < args.findIndex((a) => a.endsWith("replay.mjs")), + "cap must precede the script path or node passes it to the script instead", + ); + assert.ok(args.includes("CACHE_FIX_PREFIXDIFF=1"), "gate env must survive"); + // Census rides every sweep: dropping it silently reverts the row-4 + // annotations to on-demand and the daily verdict stops carrying them. + assert.ok(args.includes("--census"), "sweep must run the census annotations"); +}); + +test("BITE — a row that compared zero pairs is marked proves-nothing, never padded into clean", () => { + // c-empty (71 requests, all empty bodies) and single-request captures ran + // ZERO cross-request checks; before this flag they counted toward + // "9 captures clean". Absence of comparison must be visible. + const row = summarise("c-empty.jsonl", 10, json({ + report: Array.from({ length: 71 }, (_, n) => ({ n })), + violations: [], safety: [], sequence: [], orderViolations: [], + census: { pairs: 0 }, + })); + assert.equal(row.provesNothing, true); + assert.equal(rowIsClean(row), true, "proves-nothing is not FAILING — it is not PROVING"); + const real = summarise("s.jsonl", 10, json({ + report: [{ n: 0 }, { n: 1 }], + violations: [], safety: [], sequence: [], orderViolations: [], + census: { pairs: 1 }, + })); + assert.equal(real.provesNothing, false); + assert.equal(real.pairs, 1); +}); + +test("nothing comparable is NOT a failure — it is an honest absence of evidence", () => { + // 0 comparable must not fail the sweep; it also must not be mistaken for a + // pass, which is why the counts are recorded rather than a bare ratio. + const row = summarise("c.jsonl", 10, json({ + report: [{ n: 0 }], + violations: [], safety: [], sequence: [], orderViolations: [], + fidelity: { comparable: 0, matched: 0, mismatches: [] }, + })); + assert.equal(row.fidelityComparable, 0); + assert.equal(row.fidelityMismatch, 0); + assert.equal(rowIsClean(row), true); +}); + +test("mutated fidelity is recorded but INFORMATIONAL — it can never fail a row", () => { + // A mutated mismatch is legitimate (replay starts from empty state), so a + // low mutatedMatched must not fail the sweep — but on busy sessions it is + // the only fidelity signal there is, so losing the numbers would blind the + // one instrument that could notice the replay modelling a different system. + const row = summarise("c.jsonl", 10, json({ + report: [{ n: 0 }], + violations: [], safety: [], sequence: [], orderViolations: [], + fidelity: { comparable: 0, matched: 0, mutatedComparable: 40, mutatedMatched: 3, mismatches: [] }, + })); + assert.equal(row.fidelityMutatedComparable, 40); + assert.equal(row.fidelityMutatedMatched, 3); + assert.equal(rowIsClean(row), true, "a poor mutated ratio is a hint, not a verdict"); +}); diff --git a/test/harvest-pin.test.mjs b/test/harvest-pin.test.mjs new file mode 100644 index 00000000..76d4bdfb --- /dev/null +++ b/test/harvest-pin.test.mjs @@ -0,0 +1,282 @@ +// harvest --pin — BACKLOG.md "READY — harvest --pin freezes evidence +// ranges as fixtures". +// +// Motivating instances: test/insertion-suppression.test.mjs and +// test/mitigation-output-form.test.mjs both replay a specific real capture +// (s-633915a8, pair n=26->28) and SKIP once that capture rotates out of the +// per-machine retention window (~3 days, docs/dev-loop.md "Corpus +// hygiene"). `harvest --pin ` freezes the sanitized range as a +// committed, rotation-immune fixture; both real-pair tests fall back to it +// when the live capture is gone. +// +// Two things have to hold or the mechanism is worse than useless: +// - the pin mechanism itself: it writes a sanitized, well-formed fixture +// (unit-level, tiny synthetic capture); +// - the FALLBACK actually works on the real files: capture-absent + +// fixture-absent skips (never a false pass), capture-absent + +// fixture-present runs and PASSES using the real committed fixture +// (never a false fail) — checked by literally invoking the two +// real-pair test files as subprocesses with env overrides, never by +// re-deriving their assertions here. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { mkdtemp, writeFile, readFile, mkdir } from "node:fs/promises"; +import { existsSync } from "node:fs"; +import { tmpdir } from "node:os"; +import { join, dirname } from "node:path"; +import { fileURLToPath } from "node:url"; +import { execFileSync } from "node:child_process"; +import { createHash } from "node:crypto"; + +import { parsePinRange, pinRange, readPinnedFixture } from "../tools/harvest.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const REPO = join(__dirname, ".."); +const HARVEST_CLI = join(REPO, "tools", "harvest.mjs"); + +// --- parsePinRange --- + +test("parsePinRange: n..m parses to {n, m}", () => { + assert.deepEqual(parsePinRange("26..28"), { n: 26, m: 28 }); + assert.deepEqual(parsePinRange("0..0"), { n: 0, m: 0 }); +}); + +test("parsePinRange: malformed range throws", () => { + assert.throws(() => parsePinRange("28"), /--pin range must look like/); + assert.throws(() => parsePinRange("a..b"), /--pin range must look like/); + assert.throws(() => parsePinRange(undefined), /--pin range must look like/); +}); + +test("parsePinRange: end before start throws", () => { + assert.throws(() => parsePinRange("3..1"), /end must be >= start/); +}); + +// --- pinRange: sanitized, well-formed, over a tiny synthetic capture --- + +const SECRET = "the operator's actual private project detail"; + +async function writeTinyCapture(dir) { + const path = join(dir, "s-tiny0000-requests.jsonl"); + const lines = [ + JSON.stringify({ ts: "2026-01-01T00:00:00Z", type: "boot", pid: 1, proxyTree: "abc123", gates: { X: "1" } }), + JSON.stringify({ + ts: "2026-01-01T00:00:01Z", + sid: "s-tiny0000", + key: "s-tiny0000", + headers: { "anthropic-beta": "x" }, + body: { model: "claude-sonnet-5", system: "sys0", messages: [{ role: "user", content: [{ type: "text", text: SECRET }] }] }, + }), + JSON.stringify({ + ts: "2026-01-01T00:00:02Z", + type: "outcome", + id: "out-1", + key: "s-tiny0000", + requestId: "req-1", + model: "claude-sonnet-5", + usage: { cacheRead: 0, cacheCreation: 0, inputTokens: 10, outputTokens: 1 }, + outSha: "deadbeef", + outBytes: 100, + ms: 5, + }), + JSON.stringify({ + ts: "2026-01-01T00:00:03Z", + sid: "s-tiny0000", + key: "s-tiny0000", + headers: { "anthropic-beta": "x" }, + body: { + model: "claude-sonnet-5", + system: "sys0", + messages: [ + { role: "user", content: [{ type: "text", text: SECRET }] }, + { role: "assistant", content: [{ type: "text", text: "a reply" }] }, + { role: "user", content: [{ type: "text", text: "a second message" }] }, + ], + }, + }), + ]; + await writeFile(path, lines.join("\n") + "\n"); + return path; +} + +test("pinRange: sanitized (no raw secret text), shape preserved, range covers boot/outcome/request through m", async () => { + const dir = await mkdtemp(join(tmpdir(), "harvest-pin-")); + const path = await writeTinyCapture(dir); + + const records = await pinRange(path, 1); + const raw = JSON.stringify(records); + + assert.ok(!raw.includes(SECRET), "no raw content leaks into the pinned fixture"); + assert.equal(records.filter((r) => r.type === "boot").length, 1, "boot record kept for gate provenance"); + assert.equal(records.filter((r) => r.type === "outcome").length, 1, "outcome record kept (the one before m)"); + const requests = records.filter((r) => r.type !== "boot" && r.type !== "outcome"); + assert.equal(requests.length, 2, "both request 0 and request 1 (the pinned range's full prefix) are present"); + assert.ok(requests[0].body.messages[0].content[0].text.startsWith("t_"), "request text is tokenized"); + assert.equal(requests[0].sid, requests[1].sid, "identity hashing is deterministic across records"); +}); + +test("pinRange: m beyond available requests throws rather than writing a truncated fixture", async () => { + const dir = await mkdtemp(join(tmpdir(), "harvest-pin-")); + const path = await writeTinyCapture(dir); + await assert.rejects(() => pinRange(path, 5), /has only 2 request record\(s\), cannot pin through m=5/); +}); + +// --- CLI end-to-end: the actual entry point, not a re-derivation of it --- + +// The sanitized token that names the fixture, stated from its DEFINITION +// (docs/directives/fixture-sanitization-directive.md, settled design 2: a +// conversation key becomes "s-" + the first 12 hex of its sha256) rather than +// imported from tools/harvest.mjs — an expectation with the same parentage as +// the code pins the bug it should catch. +const KEY_TOKEN = `s-${createHash("sha256").update("s-tiny0000").digest("hex").slice(0, 12)}`; + +test("harvest --pin CLI: writes pinned---.json, no session key in the name, header or records", async () => { + const dir = await mkdtemp(join(tmpdir(), "harvest-pin-cli-")); + const capturesDir = join(dir, "captures"); + const outDir = join(dir, "out"); + await mkdir(capturesDir, { recursive: true }); + await writeTinyCapture(capturesDir); + + const stdout = execFileSync( + process.execPath, + [HARVEST_CLI, "--captures", capturesDir, "--out", outDir, "--pin", "s-tiny0000", "0..1"], + { encoding: "utf-8" }, + ); + assert.match(stdout, /pinned 4 record\(s\), range 0\.\.1/); + + const outPath = join(outDir, `pinned-${KEY_TOKEN}-0-1.json`); + assert.ok(existsSync(outPath), "fixture written at the expected name (the key's s- token, never the session key)"); + + const fixture = JSON.parse(await readFile(outPath, "utf-8")); + assert.equal(fixture.header.key, KEY_TOKEN); + assert.deepEqual(fixture.header.range, { n: 0, m: 1 }); + assert.equal(fixture.header.replayFrom, 0); + assert.ok(fixture.header.sanitizer, "sanitizer note present"); + assert.ok(fixture.header.harvestedAt, "harvest date present"); + const serialized = JSON.stringify(fixture); + assert.ok(!serialized.includes(SECRET), "no raw content leaks through the CLI path either"); + assert.ok(!serialized.includes("s-tiny0000"), "the raw conversation key leaks nowhere — header, records or metadata"); + // Rebased, not stamped: the capture's own 2026-01-01 wall-clock is gone and + // the deltas between records survive (boot at +0s, the two requests at +1s + // and +3s, matching writeTinyCapture's spacing). + assert.equal(fixture.records[0].ts, "2000-01-01T00:00:00.000Z"); + assert.deepEqual( + fixture.records.map((r) => Date.parse(r.ts) - Date.parse(fixture.records[0].ts)), + [0, 1000, 2000, 3000], + ); + assert.ok(!serialized.includes("2026-01-01"), "no live wall-clock survives"); +}); + +test("harvest --pin CLI: unknown key exits non-zero with a stated reason, writes nothing", async () => { + const dir = await mkdtemp(join(tmpdir(), "harvest-pin-cli-")); + const capturesDir = join(dir, "captures"); + const outDir = join(dir, "out"); + await mkdir(capturesDir, { recursive: true }); + await writeTinyCapture(capturesDir); + + assert.throws(() => + execFileSync( + process.execPath, + [HARVEST_CLI, "--captures", capturesDir, "--out", outDir, "--pin", "s-nope", "0..1"], + { encoding: "utf-8", stdio: ["ignore", "pipe", "pipe"] }, + ), + ); + assert.ok(!existsSync(join(outDir, "pinned-s-nope-0-1.json"))); +}); + +// --- readPinnedFixture: round-trips through the same [n, line] tuple shape readCapture yields --- + +test("readPinnedFixture: yields [n, line] tuples whose parsed records match what was pinned", async () => { + const dir = await mkdtemp(join(tmpdir(), "harvest-pin-")); + const capturePath = await writeTinyCapture(dir); + const records = await pinRange(capturePath, 1); + const fixturePath = join(dir, "pinned-s-tiny0000-0-1.json"); + await writeFile( + fixturePath, + JSON.stringify({ header: { key: "s-tiny0000", range: { n: 0, m: 1 } }, records }) + "\n", + ); + + const seen = []; + for await (const [n, line] of readPinnedFixture(fixturePath)) { + seen.push([n, JSON.parse(line)]); + } + assert.equal(seen.length, records.length); + assert.deepEqual( + seen.map(([, r]) => r), + // Compared through the same JSON round-trip the fixture file itself + // applies (JSON.stringify drops `undefined`-valued keys such as a + // tools-less body's `tools: undefined` from scrubRecord) — the fixture + // on disk never carries those keys either, so this is the fidelity + // contract that actually matters, not raw in-memory equality. + JSON.parse(JSON.stringify(records)), + "round-trips exactly — same records the pin wrote", + ); + assert.deepEqual( + seen.map(([n]) => n), + records.map((_, i) => i), + "indices are 0-based and contiguous, same shape readCapture's own [n, line] yields", + ); +}); + +// ===================================================================== +// Fallback red-green — the actual real-pair tests, run as subprocesses +// ===================================================================== +// +// Not a re-derivation of what insertion-suppression.test.mjs and +// mitigation-output-form.test.mjs assert: this literally invokes them with +// env overrides (CACHE_FIX_TEST_CAPTURE_OVERRIDE / +// CACHE_FIX_TEST_FIXTURE_OVERRIDE, both files) pointed at nonexistent paths +// or at the real committed fixture, and reads their own TAP output — the +// only way to know the fallback genuinely works end to end rather than +// merely compiling. Never touches the real capture file +// (~/.claude/cache-fix-captures/s-633915a8-...), which is read-only +// evidence. + +const REAL_PAIR_TESTS = [ + { file: "mitigation-output-form.test.mjs", namePattern: "mitigation output-form: real capture n=26" }, + { file: "insertion-suppression.test.mjs", namePattern: "real capture n=26->28: pin-and-suppress" }, +]; +const COMMITTED_FIXTURE = join(__dirname, "fixtures", "harvested", "pinned-s-4b6a435234bf-26-28.json"); + +// --test-reporter=tap: a stable, greppable "# pass N" / "# skipped N" / "# +// fail N" summary — the default reporter's exact wording ("ℹ pass N", no +// leading "#") is not a documented contract to grep against. +// +// NODE_TEST_CONTEXT / NODE_TEST_WORKER_ID must NOT reach the child: this +// file itself runs under `node --test`, which sets both; inherited by a +// NESTED `node --test` invocation, the child silently emits nothing to +// stdout (observed directly — reporter output present unset, empty string +// captured when inherited) rather than erroring, which would have looked +// like a false "fallback broken" red instead of a harness artifact. +function runRealPairTest({ file, namePattern }, env) { + const childEnv = { ...process.env, ...env }; + delete childEnv.NODE_TEST_CONTEXT; + delete childEnv.NODE_TEST_WORKER_ID; + const result = execFileSync( + process.execPath, + ["--test", "--test-reporter=tap", `--test-name-pattern=${namePattern}`, join(__dirname, file)], + { encoding: "utf-8", cwd: REPO, env: childEnv, stdio: ["ignore", "pipe", "pipe"] }, + ); + return result; +} + +for (const spec of REAL_PAIR_TESTS) { + test(`fallback RED: ${spec.file} skips (not fails) when capture and fixture are both absent`, () => { + const out = runRealPairTest(spec, { + CACHE_FIX_TEST_CAPTURE_OVERRIDE: "/nonexistent/no-such-capture.jsonl", + CACHE_FIX_TEST_FIXTURE_OVERRIDE: "/nonexistent/no-such-fixture.json", + }); + assert.match(out, /# pass 0/); + assert.match(out, /# skipped 1/); + assert.match(out, /COULD NOT VERIFY/); + }); + + test(`fallback GREEN: ${spec.file} runs and passes from the committed pinned fixture when the capture is absent`, () => { + assert.ok(existsSync(COMMITTED_FIXTURE), "the committed n=26->28 fixture must exist for this check to mean anything"); + const out = runRealPairTest(spec, { + CACHE_FIX_TEST_CAPTURE_OVERRIDE: "/nonexistent/no-such-capture.jsonl", + }); + assert.match(out, /# pass 1/); + assert.match(out, /# fail 0/); + }); +} diff --git a/test/harvest-scrub-relations.test.mjs b/test/harvest-scrub-relations.test.mjs new file mode 100644 index 00000000..b2f5a258 --- /dev/null +++ b/test/harvest-scrub-relations.test.mjs @@ -0,0 +1,258 @@ +// harvest — the RELATIONS the scrub must carry, not just the bytes it must +// destroy. +// +// harvest.test.mjs pins what sanitization REMOVES (content) and that it does +// so deterministically. That is necessary and, as measured, not sufficient: +// every structural class this repo chases is defined by a relation BETWEEN +// texts, and a scrub that tokenizes whole texts destroys the two relations +// the reminder-migration domain is built on — +// +// scrub(a + "\n\n" + b) !== scrub(a) + "\n\n" + scrub(b) +// +// executed against the shipped sanitizer in +// docs/code-reviews/extended-absorb-report.md §c5: +// +// scrubbed inner reminder : t_557f9b1ec47a_50 +// scrubbed merged : t_9c41a9f9b0c1_100 +// scrubbed standalone : t_d258c4d5a7e5_48 +// prefix relation survives: false +// join relation survives : false +// +// A fixture harvested for MERGED-STANDALONE therefore could not reproduce +// the class it was pinned for, and the extended-absorb test had to hand-build +// synthetic tokens instead. This file states the relations as PROPERTIES — +// their expectations come from the domain's join contract (census +// canonical()/classify() join reminder blocks with "\n\n"; +// insertion-normalization's findSuppressibleDuplicate compares the same +// join), never from what scrubText happens to do. +// +// The properties, in the order asserted: +// 1. Equality — equal inputs give equal outputs (and no content leaks). +// 2. Join — scrub is a homomorphism over "\n\n". +// 3. Prefix — paragraph-granular startsWith survives scrubbing. +// 4. Degradation — inputs outside the contract lose the relation without +// crashing and without leaking; the residual is accepted. +// +// The scrub is exercised through its exported surface (scrubMessage), the +// same channel §c5 refuted it on, so what is tested is what fixtures get. +// All text here is synthetic — this repo is public. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { scrubMessage } from "../tools/harvest.mjs"; + +const scrub = (text) => scrubMessage({ role: "user", content: text }).content; + +// A scrubbed text is well-formed when every "\n\n"-separated segment is +// either empty or a token of the documented shape. Stated from the token +// contract in harvest.mjs's sanitization header (t__), +// not from the current code path. +const TOKEN = /^t_[0-9a-f]{12}_[0-9]+$/; +const wellFormed = (scrubbed) => + scrubbed.split("\n\n").every((seg) => seg === "" || TOKEN.test(seg)); + +const PARA_A = "first paragraph of a synthetic reminder body"; +const PARA_B = "second paragraph, arriving later as its own block"; +const PARA_C = "a third block that the next request merges in"; + +// --- 1. Equality ------------------------------------------------------------ +// +// Definition: the scrub is a function of the bytes alone. Two texts with equal +// bytes scrub equal; two with different bytes scrub different. This is what +// makes identity matching across requests survive sanitization at all, and it +// is unchanged by anything below. + +test("equality: equal bytes scrub equal, different bytes scrub different, no content survives", () => { + const text = `${PARA_A}\n\n${PARA_B}`; + assert.equal(scrub(text), scrub(text), "same bytes must give the same token string"); + assert.notEqual(scrub(text), scrub(`${PARA_A}\n\n${PARA_C}`), "different bytes must differ"); + for (const word of ["paragraph", "synthetic", "reminder", "arriving"]) { + assert.ok(!scrub(text).includes(word), `no source bytes may survive (${word})`); + } + assert.ok(wellFormed(scrub(text)), "output is tokens joined by the separator"); +}); + +// The fixed-constant lesson (harvest.mjs lines 105-125), restated at +// paragraph granularity: CC migrates a reminder OUT of its wrapper into a +// standalone duplicate, and insertion-normalization suppresses the duplicate +// by comparing the wrapped original's STRIPPED bytes against the standalone's +// bytes. So a wrapped multi-paragraph body and a standalone copy of the same +// bytes must still scrub equal — the property a fixed "REDACTED" placeholder +// broke, and the one a per-segment scrub must not break either. + +test("equality: a wrapped multi-paragraph reminder and its unwrapped duplicate still match", () => { + const inner = `${PARA_A}\n\n${PARA_B}`; + const wrapped = scrub(`\n${inner}\n`); + const standalone = scrub(inner); + assert.equal(wrapped, `\n${standalone}\n`, + "the wrapper survives verbatim and the inner text scrubs to the standalone's token string"); + assert.ok(!wrapped.includes("paragraph"), "no source bytes survive inside the wrapper"); +}); + +// --- 2. Join ---------------------------------------------------------------- +// +// Definition (census canonical(): reminder blocks are joined with "\n\n"): +// for texts a and b that do not themselves end/begin with a newline at the +// boundary, scrubbing the join equals joining the scrubs. Without this, a +// harvested fixture of a merge cannot show the merge. + +test("join: scrub(a + \"\\n\\n\" + b) === scrub(a) + \"\\n\\n\" + scrub(b)", () => { + const a = PARA_A; + const b = PARA_B; + assert.equal(scrub(`${a}\n\n${b}`), `${scrub(a)}\n\n${scrub(b)}`); +}); + +test("join: holds for three segments and for an empty middle segment", () => { + assert.equal( + scrub(`${PARA_A}\n\n${PARA_B}\n\n${PARA_C}`), + `${scrub(PARA_A)}\n\n${scrub(PARA_B)}\n\n${scrub(PARA_C)}`, + "associativity — a merge of three blocks is still readable post-scrub", + ); + // An empty segment carries no bytes, so it has nothing to tokenize and + // stays empty; the join contract is unaffected by it. + assert.equal(scrub(`${PARA_A}\n\n\n\n${PARA_B}`), `${scrub(PARA_A)}\n\n\n\n${scrub(PARA_B)}`); +}); + +// --- 3. Prefix at paragraph granularity ------------------------------------- +// +// Definition (census classify(): EXTENDED means actual === recon + extra, i.e. +// actual.startsWith(recon), with the extra separated by the "\n\n" join): +// when the successor is the predecessor plus one more block, the scrubbed +// successor must still start with the scrubbed predecessor. This is the §c5 +// refutation reversed. + +test("prefix: an EXTENDED pair keeps startsWith after scrubbing", () => { + const recon = `${PARA_A}\n\n${PARA_B}`; + const actual = `${recon}\n\n${PARA_C}`; + assert.ok(scrub(actual).startsWith(scrub(recon)), + "the scrubbed successor must still be an extension of the scrubbed predecessor"); +}); + +test("prefix: the extra block is recoverable at the same join the census strips", () => { + // census extendedRemainder() takes actual.slice(recon.length) and removes a + // leading "\n\n". Post-scrub that must yield exactly the scrubbed extra — + // otherwise MERGED-STANDALONE cannot be told from NEW-TEXT in a fixture. + const recon = PARA_A; + const actual = `${recon}\n\n${PARA_C}`; + const remainder = scrub(actual).slice(scrub(recon).length); + assert.equal(remainder.startsWith("\n\n") ? remainder.slice(2) : remainder, scrub(PARA_C)); +}); + +test("prefix: a NON-extension does not falsely satisfy startsWith", () => { + // The property must discriminate: a successor whose first block differs is + // not an extension, and the scrub must not manufacture one. + const recon = PARA_A; + const actual = `${PARA_B}\n\n${PARA_C}`; + assert.ok(!scrub(actual).startsWith(scrub(recon))); +}); + +// --- 4. Degradation, never breakage ----------------------------------------- +// +// Definition: the domain's join contract is "\n\n" and nothing narrower, so +// relations that live at a different granularity are NOT promised. What IS +// promised for those inputs: the scrub still runs, still destroys content, and +// still returns a deterministic well-formed token string — it degrades to the +// whole-text behaviour it had before, it does not break. +// +// Measured residuals (recorded, deliberately NOT asserted as equalities — a +// future scrub that preserved them would be a strengthening, and a test that +// went red on it would be firing on a non-defect): +// - a boundary that creates a "\n\n\n" run (a ends with "\n") re-splits as +// ["a", "\nb"], so join does not hold; +// - a sub-paragraph extension (extra appended with no blank line) is one +// segment, so prefix does not hold. + +test("degradation: a \"\\n\\n\\n\" boundary loses the relation but stays safe and deterministic", () => { + const a = `${PARA_A}\n`; // trailing newline: joining makes a three-newline run + const b = PARA_B; + const joined = `${a}\n\n${b}`; + const out = scrub(joined); + assert.equal(out, scrub(joined), "deterministic"); + assert.ok(wellFormed(out), "well-formed token string — today's behaviour, no breakage"); + for (const word of ["paragraph", "synthetic", "arriving"]) { + assert.ok(!out.includes(word), `no content leak on the degraded path (${word})`); + } +}); + +test("degradation: a sub-paragraph extension stays safe, and its relation is not promised", () => { + const recon = PARA_A; + const actual = `${recon} and some more text on the same line`; + const out = scrub(actual); + assert.ok(wellFormed(out)); + assert.ok(!out.includes("more text"), "no content leak"); + assert.ok(!out.includes(String(recon.length)) || out !== scrub(recon), + "a sub-paragraph extension is a different text and gets a different token"); +}); + +test("degradation: non-strings and the empty string pass through unchanged", () => { + assert.equal(scrub(""), "", "an empty text has nothing to tokenize"); + const m = scrubMessage({ role: "user", content: [{ type: "text", text: "" }] }); + assert.equal(m.content[0].text, ""); +}); + +// --- 5. Nesting: the payload one level below where the scrubber looks -------- +// +// DEFINITION (Anthropic Messages wire format): a content block carries its +// binary payload at `block.source.data`, with `block.source.type` and +// `block.source.media_type` as shape fields beside it. The sanitizer's +// contract is "no raw content bytes leave the capture" — a contract about the +// PAYLOAD, not about a field name at a particular depth. So the expectation +// here is: whatever string a block's `source` carries as content must come out +// tokenized, exactly like a top-level `data`. +// +// This is not a hypothetical depth. Measured 2026-07-31 +// (docs/audits/pr-prep-2026-07-31/pr-prep-report.md gap 1): the committed +// reset-move fixture carried five image/png blocks with 13,060 raw base64 +// chars each at `source.data`, decoding to a screenshot with `tEXt` chunks +// naming the desktop environment, locale and wall-clock — while the fixture's +// own `_sanitization` header claimed it "keeps no raw text at all". +// +// Fail closed, not open: the wire format is not ours to freeze, so any OTHER +// string under `source` longer than 64 chars is tokenized too. Short shape +// fields (`type`, `media_type`) pass, because a reader that branches on them +// is testing the block's KIND, which is structure, not content. + +const IMAGE_B64 = + // synthetic, not a real image: 300 base64-alphabet chars, long enough to be + // a payload by any measure and to trip the corpus scan in section 6. + "QUJDREVGR0hJSktMTU5PUFFSU1RVVldYWVphYmNkZWZnaGlqa2xtbm9wcXJzdHV2d3h5ejAxMjM0" .repeat(4); +const DATA_TOKEN = /^data_[0-9a-f]{10}$/; + +test("nesting: a wire image block's source.data is tokenized, its shape fields survive", () => { + const block = { + type: "image", + source: { type: "base64", media_type: "image/png", data: IMAGE_B64 }, + }; + const out = scrubMessage({ role: "user", content: [block] }).content[0]; + assert.match(out.source.data, DATA_TOKEN, "the payload must become a data_ token"); + assert.ok(!out.source.data.includes(IMAGE_B64.slice(0, 32)), "no payload bytes may survive"); + assert.equal(out.source.type, "base64", "shape fields are structure and survive"); + assert.equal(out.source.media_type, "image/png"); + assert.equal(out.type, "image"); +}); + +test("nesting: equal payloads tokenize equal, different payloads differ", () => { + // The same determinism the top-level `data` field has: five copies of one + // image in one fixture must stay five copies of one token, or a fixture + // built for a re-send class stops showing the re-send. + const mk = (d) => scrubMessage({ + role: "user", + content: [{ type: "image", source: { type: "base64", media_type: "image/png", data: d } }], + }).content[0].source.data; + // Both legs must be TOKENS, or the property passes for the wrong reason: + // raw payloads are trivially equal to themselves and unequal to others, so + // without this the assertion is satisfied by the unfixed scrubber. + assert.match(mk(IMAGE_B64), DATA_TOKEN); + assert.equal(mk(IMAGE_B64), mk(IMAGE_B64)); + assert.notEqual(mk(IMAGE_B64), mk(`${IMAGE_B64}A`)); +}); + +test("nesting: an unknown long string under source is tokenized too (fail closed)", () => { + const out = scrubMessage({ + role: "user", + content: [{ type: "document", source: { type: "text", media_type: "text/plain", url: `https://example.invalid/${"p".repeat(80)}` } }], + }).content[0]; + assert.match(out.source.url, DATA_TOKEN, "a >64-char string under source is a payload until proven otherwise"); + assert.equal(out.source.media_type, "text/plain", "a short shape field still passes"); +}); diff --git a/test/harvest.test.mjs b/test/harvest.test.mjs new file mode 100644 index 00000000..a35cf42a --- /dev/null +++ b/test/harvest.test.mjs @@ -0,0 +1,214 @@ +// harvest — sanitization and selection tests. +// +// The harvester exists because live captures are transient (677 MB/day +// against a 2 GB oldest-first cap, ~3 days retention) while ~95% of what +// they contain is structurally uninteresting. It keeps the novel ~5% as +// committable fixtures. +// +// Two properties have to hold or the tool is worse than useless: +// - sanitization must remove real conversation content, because the output +// is committed to a repo; +// - it must remove it DETERMINISTICALLY, because identity matching across +// requests is precisely what the fixtures test — a random placeholder +// would destroy the structure being preserved. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { scrubMessage, scrubRecord, selectNovelPairs } from "../tools/harvest.mjs"; + +test("scrub: real text is replaced, and the same text always yields the same token", () => { + const secret = "the operator's actual prompt about their private project"; + const a = scrubMessage({ role: "user", content: [{ type: "text", text: secret }] }); + const b = scrubMessage({ role: "user", content: [{ type: "text", text: secret }] }); + assert.equal(a.content[0].text, b.content[0].text, "deterministic — identity must survive scrubbing"); + assert.ok(!a.content[0].text.includes("operator"), "no source text leaks"); + assert.ok(a.content[0].text.startsWith("t_")); +}); + +test("scrub: different text yields different tokens", () => { + const a = scrubMessage({ role: "user", content: "alpha" }); + const b = scrubMessage({ role: "user", content: "beta" }); + assert.notEqual(a.content, b.content); +}); + +test("scrub: system-reminder wrappers survive — the wrapper IS the class", () => { + // The volatile-block detector matches on this wrapper. Scrubbing it away + // would erase the property the flip/pin fixtures exist to exercise. + const m = scrubMessage({ + role: "user", + content: [{ type: "text", text: "\nsecret detail\n" }], + }); + assert.match(m.content[0].text, /^\n/); + assert.ok(!m.content[0].text.includes("secret detail")); +}); + +test("scrub: message SHAPE is preserved exactly", () => { + // Structure is the payload. Block count, types and order must be untouched + // or every census class the fixture encodes is destroyed. + const m = scrubMessage({ + role: "user", + content: [ + { type: "tool_result", tool_use_id: "t1", content: "output" }, + { type: "text", text: "note" }, + ], + }); + assert.equal(m.role, "user"); + assert.equal(m.content.length, 2); + assert.equal(m.content[0].type, "tool_result"); + assert.equal(m.content[0].tool_use_id, "t1", "structural ids must not be rewritten"); + assert.equal(m.content[1].type, "text"); +}); + +test("scrub: string-content messages stay string-content", () => { + // The shape flip (single text block <-> bare string) is itself a class; + // normalizing shapes during scrubbing would hide it. + const m = scrubMessage({ role: "system", content: "a harness note" }); + assert.equal(typeof m.content, "string"); +}); + +test("scrub: thinking signatures and tool inputs are redacted", () => { + const m = scrubMessage({ + role: "assistant", + content: [ + { type: "thinking", thinking: "private reasoning", signature: "AAAA-real-signature" }, + { type: "tool_use", id: "t1", name: "Bash", input: { command: "cat ~/.ssh/id_rsa" } }, + ], + }); + assert.ok(!JSON.stringify(m).includes("private reasoning")); + assert.ok(!JSON.stringify(m).includes("id_rsa")); + assert.equal(m.content[1].id, "t1", "tool ids stay — adjacency depends on them"); + assert.deepEqual(Object.keys(m.content[1].input), ["command"], "input SHAPE is kept"); +}); + +test("scrub: record drops tool schemas but keeps tool names", () => { + // tools[] add/remove/reorder is a real bust class, so names matter; + // descriptions and parameter docs are content and do not. + const rec = scrubRecord({ + ts: "2026-07-28T00:00:00Z", + sid: "real-session-id", + key: "s-real-session-id", + headers: { "anthropic-beta": "context-management-2025-06-27", "session-id": "real-session-id" }, + body: { + model: "claude-opus-5", + tools: [{ name: "Bash", description: "runs shell commands", input_schema: { type: "object" } }], + messages: [{ role: "user", content: "hello" }], + }, + }); + assert.deepEqual(rec.body.tools, [{ name: "Bash" }]); + assert.ok(!JSON.stringify(rec).includes("real-session-id"), "session ids are hashed"); + assert.equal(rec.headers["anthropic-beta"], "context-management-2025-06-27", "betas are structural"); +}); + +test("select: boring pairs are never harvested", () => { + const msg = (t) => ({ role: "user", content: [{ type: "text", text: t }] }); + const rec = (msgs) => ({ body: { messages: msgs } }); + const base = [msg("u0"), msg("u1")]; + const records = [rec(base), rec([...base, msg("u2")])]; // pure append + assert.equal(selectNovelPairs(records, new Set()).length, 0); +}); + +test("select: a class already banked is not harvested twice", () => { + const msg = (t) => ({ role: "user", content: [{ type: "text", text: t }] }); + const rec = (msgs) => ({ body: { messages: msgs } }); + const a = [msg("u0"), msg("u1"), msg("u2")]; + const b = [msg("u0"), msg("u1"), msg("EDITED")]; + const records = [rec(a), rec(b)]; + assert.equal(selectNovelPairs(records, new Set()).length, 1, "novel the first time"); + assert.equal(selectNovelPairs(records, new Set(["replace/edit"])).length, 0, "not the second"); +}); + +test("select: pairs are formed within a conversation, never across tenants", () => { + // Co-tenant traffic shares a capture file. Comparing a subagent's request + // against the main thread's is the sidecar-churn artifact, not a finding. + const msg = (t) => ({ role: "user", content: [{ type: "text", text: t }] }); + const rec = (msgs) => ({ body: { messages: msgs } }); + const records = [ + rec([msg("convA"), msg("a1")]), + rec([msg("convB-entirely-different"), msg("b1")]), + rec([msg("convA"), msg("a1"), msg("a2")]), // append within A + ]; + assert.equal(selectNovelPairs(records, new Set()).length, 0, "A->B and B->A are not pairs"); +}); + +// --- Shape watch: the dormant thinking classes must not reactivate unseen --- + +import { scanCapture, completedThinkingTextCount, thinkingCountInPrefix } from "../tools/harvest.mjs"; +import { writeFile as wf, mkdtemp as mkd, rm as rmr } from "node:fs/promises"; +import { tmpdir } from "node:os"; +import { join as pjoin } from "node:path"; + +const think = (text) => ({ type: "thinking", thinking: text, signature: "SIG==" }); +const req = (msgs, extra = {}) => JSON.stringify({ ts: "t", body: { model: "m", messages: msgs, system: [{ type: "text", text: "sys" }], tools: [], ...extra } }); + +test("completedThinkingTextCount: stubs are not population; active continuations are exempt", () => { + const stubOnly = [{ role: "assistant", content: [think(""), { type: "text", text: "done" }] }]; + assert.equal(completedThinkingTextCount(stubOnly), 0, "signature-only stubs are the measured-normal state"); + const fat = [{ role: "assistant", content: [think("real reasoning"), { type: "text", text: "done" }] }]; + assert.equal(completedThinkingTextCount(fat), 1); + const continuation = [ + { role: "assistant", content: [think("real"), { type: "tool_use", id: "t1", name: "x", input: {} }] }, + { role: "user", content: [{ type: "tool_result", tool_use_id: "t1", content: "r" }] }, + ]; + assert.equal(completedThinkingTextCount(continuation), 0, "protected-by-contract thinking is not droppable population"); +}); + +test("BITE — a capture where completed-turn thinking text reappears sets the shape counters", async () => { + const dir = await mkd(pjoin(tmpdir(), "harvest-shape-")); + const cap = pjoin(dir, "s-x-requests.jsonl"); + const u = { role: "user", content: [{ type: "text", text: "q" }] }; + const fatTurn = { role: "assistant", content: [think("REAL TEXT — the dormant population"), { type: "text", text: "a" }] }; + try { + // Pair 2 also DROPS a thinking block from shared history (76253 shape): + const msgs1 = [u, fatTurn]; + const msgs2 = [u, { role: "assistant", content: [{ type: "text", text: "a" }] }, { role: "user", content: [{ type: "text", text: "next" }] }]; + await wf(cap, req(msgs1) + "\n" + req(msgs2) + "\n"); + const { shape } = await scanCapture(cap, new Set()); + assert.equal(shape.pairs, 1); + assert.equal(shape.thinkingDropPairs, 1, "the 76253 shape must be counted"); + assert.ok(shape.systemBytes > 0, "baseline prefix size recorded"); + // Population lives in the NEWEST request per conversation; msgs2 has no + // fat thinking left, so the counter reads 0 here... + assert.equal(shape.thinkingTextCompleted, 0); + // ...and reads 1 when the newest request still carries it. + await wf(cap, req(msgs1) + "\n"); + const again = await scanCapture(cap, new Set()); + assert.equal(again.shape.thinkingTextCompleted, 1, "the 69568 population must be counted when present"); + } finally { + await rmr(dir, { recursive: true, force: true }); + } +}); + +// --- Growth-step snapshots: the evidence must outlive capture rotation --- + +import { detectGrowthSteps, growthComponentSnapshot, GROWTH_STEP_FLOOR } from "../tools/harvest.mjs"; + +test("BITE — a +15% baseline step is detected; floor and shrinkage are not", () => { + const prior = { systemBytes: 20000, toolsBytes: 40000 }; + const grown = { systemBytes: 38800, toolsBytes: 40000 }; + assert.deepEqual(detectGrowthSteps(prior, grown), [ + { field: "systemBytes", oldBytes: 20000, newBytes: 38800 }, + ]); + assert.deepEqual(detectGrowthSteps(prior, { systemBytes: 21000, toolsBytes: 40000 }), [], + "below threshold is not a step"); + assert.deepEqual(detectGrowthSteps(prior, { systemBytes: 9000, toolsBytes: 40000 }), [], + "shrinkage is visible intent, never a step"); + assert.deepEqual(detectGrowthSteps({ systemBytes: 100 }, { systemBytes: 400 }), [], + `percentages on values under the ${GROWTH_STEP_FLOOR}-byte floor are noise`); + assert.deepEqual(detectGrowthSteps(undefined, grown), [], "no prior shape, no comparison"); +}); + +test("growthComponentSnapshot: identity and sizes survive, content does not", () => { + const secret = "the operator's private system prompt about their client project"; + const body = { + system: [{ type: "text", text: secret }], + tools: [{ name: "Bash", description: "secret tool description with paths", input_schema: { x: 1 } }], + }; + const snap = growthComponentSnapshot(body); + const raw = JSON.stringify(snap); + assert.ok(!raw.includes("private") && !raw.includes("client") && !raw.includes("paths"), + "no source content may reach a committable artifact"); + assert.equal(snap.tools[0].name, "Bash", "identity survives"); + assert.ok(snap.tools[0].bytes > 50, "per-item size survives — the attribution signal"); + assert.ok(snap.system[0].bytes > secret.length, "block size reflects the real serialization"); +}); diff --git a/test/insertion-join-move.test.mjs b/test/insertion-join-move.test.mjs new file mode 100644 index 00000000..e1d5919c --- /dev/null +++ b/test/insertion-join-move.test.mjs @@ -0,0 +1,868 @@ +// insertion-join-move — the CROSS-MESSAGE join, and the first-seen re-serve +// that absorbs it. Sibling to insertion-suppression.test.mjs (one block moves +// out alone) and insertion-merge-suppression.test.mjs (all of ONE message's +// blocks move out together). This file covers the leg neither of those can +// match: a reminder and the WHOLE standalone message beside it leaving as one +// merged message, so the join spans TWO source messages and one of them stops +// being sent at all. +// +// Measured, threat-matrix row 4's 2026-07-30 datapoint (221k bust, session +// 0d6f38ba). Fixture flap-s-0dc8ac87c43d-86.json carries the real four requests, +// so the proof outlives the capture's rotation. +// +// The expected values below come from the DEFINITION (findJoinMoves' comment +// in the extension), not from what the code currently returns — an expectation +// with the same parentage as the implementation pins the bug it should catch. +// The definition is: an entry disappears while a new standalone appears whose +// text is exactly [the predecessor's wrapped blocks, "\n\n"-joined] + "\n\n" + +// [the disappeared entry's whole first-seen text], landing strictly inside the +// gap the disappeared entry left. That is a MOVE, not an edit: nothing was +// rewritten, so the honest response is to keep serving the first-seen bytes. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { readFileSync } from "node:fs"; +import { dirname, join } from "node:path"; +import { fileURLToPath } from "node:url"; + +import { classifyPinned, findJoinMoves } from "../proxy/extensions/insertion-normalization.mjs"; +import { + findStabilityViolations, + findSafetyViolations, + findConservationViolations, + findSequenceViolations, +} from "../tools/replay.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const FLAP = JSON.parse( + readFileSync(join(__dirname, "fixtures", "harvested", "flap-s-0dc8ac87c43d-86.json"), "utf-8"), +); +// The reset leg (unit 2b). Section (d) below is the only reader. +const RESET_MOVE = JSON.parse( + readFileSync(join(__dirname, "fixtures", "harvested", "reset-move-s-97097e027ac0-196-197.json"), "utf-8"), +); + +const REM = "PreToolUse:Edit hook additional context: check the date"; +const WRAPPED = `\n${REM}\n`; +const NUDGE = "The task tools haven't been used recently."; + +const toolUse = (id) => ({ role: "assistant", content: [{ type: "tool_use", id, name: "Edit", input: {} }] }); +const toolResult = (id, extra = []) => ({ + role: "user", + content: [{ type: "tool_result", tool_use_id: id, content: "out" }, ...extra], +}); +const txt = (t) => ({ type: "text", text: t }); + +// The INLINE leg CC sent first: message 2 carries the reminder, message 3 is +// the standalone nudge sitting right after it. +const inlineLeg = () => [ + { role: "user", content: [txt("q1")] }, + toolUse("tu1"), + toolResult("tu1", [txt(WRAPPED)]), + { role: "system", content: NUDGE }, + toolUse("tu2"), + toolResult("tu2"), + { role: "assistant", content: [txt("a")] }, +]; + +// The STANDALONE leg: message 2 has shed its reminder, the nudge is gone as a +// message of its own, and one merged message carries both. The trailing turn +// makes the pair ordinary growth rather than a drop-only shrink. +const standaloneLeg = (mergedText = `${REM}\n\n${NUDGE}`) => [ + { role: "user", content: [txt("q1")] }, + toolUse("tu1"), + toolResult("tu1"), + { role: "system", content: mergedText }, + toolUse("tu2"), + toolResult("tu2"), + { role: "assistant", content: [txt("a")] }, + { role: "user", content: [txt("q2")] }, +]; + +// Prime the canonical on the inline leg, then classify the standalone leg — +// the two-request shape every one of these cases needs. +function afterInline(cur, first = inlineLeg()) { + const primed = classifyPinned(first, null); + return classifyPinned(cur, primed.canonicalEntries); +} + +// ===================================================================== +// (a) The real bytes +// ===================================================================== + +test("BITE — the real 2026-07-30 flap: the standalone leg is a MOVE, not an edit-shaped reset", () => { + // Before this change the shipped extension answered reset("edit-shaped") on + // n=104 and n=108, which un-suppressed everything and re-billed from the + // flap index. The fixture's own _measured note records that verdict. + const seen = []; + let canon = null; + for (const r of FLAP.requests) { + const res = classifyPinned(r.messages, canon); + seen.push({ n: r.n, action: res.action, reason: res.resetReason ?? null, moved: res.moved ?? 0, out: (res.messages ?? r.messages).length }); + canon = res.canonicalEntries; + } + assert.deepEqual( + seen.map((s) => `n=${s.n} ${s.action}${s.reason ? `/${s.reason}` : ""} moved=${s.moved}`), + [ + "n=102 reset/no-prior-canonical moved=0", + "n=104 normalized moved=1", + "n=105 append-only moved=0", + "n=108 normalized moved=1", + ], + "no leg of the flap may answer with an edit-shaped reset", + ); + assert.equal(seen[1].out, 97, "99 incoming, 3 suppressed, 1 re-served"); + assert.equal(seen[3].out, 99); +}); + +test("BITE — the real flap's forwarded bytes hold the migrating region byte-stable", () => { + // The claim that matters to a cache: CC's own arrays diverge at the flap + // index on every leg, and ours must not. Indices 85..94 are the migrating + // region (fixture _legs); the forwarded region must be the INLINE form + // throughout, which is the form this conversation already cached. + let canon = null; + const outs = []; + for (const r of FLAP.requests) { + const res = classifyPinned(r.messages, canon); + outs.push(res.messages ?? r.messages); + canon = res.canonicalEntries; + } + const region = (a) => JSON.stringify(a.slice(85, 95)); + const inline = region(FLAP.requests[0].messages); + for (let i = 0; i < outs.length; i++) { + assert.equal(region(outs[i]), inline, `request ${FLAP.requests[i].n} forwards the inline form of 85..94`); + } + // And CC's raw bytes really did move there — otherwise this asserts nothing. + assert.notEqual( + region(FLAP.requests[1].messages), + inline, + "the fixture must actually contain the migration, or the assertion above is vacuous", + ); +}); + +test("the real flap passes all five gates", () => { + let canon = null; + const entries = []; + for (const r of FLAP.requests) { + const res = classifyPinned(r.messages, canon); + entries.push({ + n: r.n, ts: r.ts, key: "s-0d6f38ba", + inMsgs: r.messages, outMsgs: res.messages ?? r.messages, + inTools: [], outTools: [], + action: res.action, resetReason: res.resetReason ?? null, stats: res, + }); + canon = res.canonicalEntries; + } + assert.deepEqual(findStabilityViolations(entries), []); + assert.deepEqual(findSafetyViolations(entries), []); + assert.deepEqual(findConservationViolations(entries), []); + assert.deepEqual(findSequenceViolations(entries), []); + assert.deepEqual(entries.filter((e) => e.stats.canonOrderViolation).map((e) => e.n), []); +}); + +// ===================================================================== +// (b) The definition, one condition at a time +// ===================================================================== + +test("the synthetic move: merged message suppressed, absorbed entry re-served in its old place", () => { + const res = afterInline(standaloneLeg()); + assert.equal(res.action, "normalized"); + assert.equal(res.resetReason, undefined); + assert.equal(res.moved, 1); + assert.deepEqual(res.suppressions.map((s) => ({ index: s.index, kind: s.kind })), [{ index: 3, kind: "join-move" }]); + assert.deepEqual(res.reserves.map((r) => r.index), [3], "re-served into the merged message's own slot"); + assert.equal(res.dropped, 0, "an entry we are still serving was not dropped"); + // The forwarded array is the inline leg again, plus the new turn. + assert.deepEqual(res.messages, [...inlineLeg(), { role: "user", content: [txt("q2")] }]); + // One message in, one message out: a move is a SUBSTITUTION, which is what + // lets every downstream check stay index-free (see wireRemovedIndices). + assert.equal(res.messages.length, standaloneLeg().length); +}); + +test("BITE — condition (b): only reminder-WRAPPED blocks may form the join's reminder side", () => { + // Candidacy (47defba): the wrapper is what makes a block + // the decoration CC relocates. An ordinary sibling text block is content, and + // a join built out of it is not this class. + // + // The host below carries BOTH a plain sibling and a wrapped reminder, which + // is what isolates the condition: the entry stores a first-seen form either + // way, so the move can only be refused because the plain block fails + // candidacy. An earlier draft used a host with no wrapped block at all and + // passed for the wrong reason — no stored form — leaving the predicate + // untested; it survived the mutation that deletes candidacy. + const first = inlineLeg(); + first[2] = toolResult("tu1", [txt("a plain sibling block"), txt(WRAPPED)]); + const cur = standaloneLeg(`a plain sibling block\n\n${REM}\n\n${NUDGE}`); + cur[2] = toolResult("tu1", [txt("a plain sibling block")]); + const res = afterInline(cur, first); + assert.equal(res.moved ?? 0, 0, "the plain sibling is not decoration, so this join is not the measured shape"); + + // Control: the SAME host, joined from its wrapped block alone, IS a move — + // otherwise the assertion above could be passing for any reason at all. + const ok = standaloneLeg(); + ok[2] = toolResult("tu1", [txt("a plain sibling block")]); + assert.equal(afterInline(ok, first).moved, 1); +}); + +test("BITE — condition (c): the constituents must join in the measured ORDER", () => { + const res = afterInline(standaloneLeg(`${NUDGE}\n\n${REM}`)); + assert.equal(res.moved ?? 0, 0, "reminder first, absorbed standalone second — the one measured order"); +}); + +test("BITE — condition (c): only the measured separator counts", () => { + const res = afterInline(standaloneLeg(`${REM}\n${NUDGE}`)); + assert.equal(res.moved ?? 0, 0, "a single newline is a different, unobserved grammar"); +}); + +test("BITE — condition (c): a SUBSET join is not a move", () => { + // Suppressing on a partial match would drop whatever the merged message + // carries beyond the part we recognised. + const res = afterInline(standaloneLeg(`${REM}\n\n${NUDGE} plus content nobody has seen before`)); + assert.equal(res.moved ?? 0, 0); +}); + +test("BITE — condition (d): a merged message OUTSIDE the vacated gap is not a move", () => { + // Co-location is the same discriminator the edit-shaped test uses: only a + // message landing where the absorbed entry sat can be that entry's + // repackaging. Here the merged text arrives after the tool pair instead. + const cur = [ + { role: "user", content: [txt("q1")] }, + toolUse("tu1"), + toolResult("tu1"), + toolUse("tu2"), + toolResult("tu2"), + { role: "system", content: `${REM}\n\n${NUDGE}` }, + { role: "assistant", content: [txt("a")] }, + { role: "user", content: [txt("q2")] }, + ]; + const res = afterInline(cur); + assert.equal(res.moved ?? 0, 0); +}); + +test("BITE — condition (e): a merged message with no surviving successor is not a move", () => { + // The gap a move lands in must be BOUNDED. With nothing surviving after the + // absorbed entry the gap runs to the end of the array, so any later message + // could be matched to it — and the merged message is then at or beyond the + // tail, where suppressing it would leave the request not ending on the + // message CC sent last (three real 400s). + // + // The conversation here is the inline leg TRUNCATED to end on the standalone, + // so exactly ONE entry disappears. An earlier draft reused the full inline + // leg, which dropped four of seven entries and therefore reset with + // `dropped-majority` long before this condition was consulted — it passed + // while testing nothing, and survived the mutation that deletes the bound. + const first = [ + { role: "user", content: [txt("q1")] }, + toolUse("tu1"), + toolResult("tu1", [txt(WRAPPED)]), + { role: "system", content: NUDGE }, + ]; + const cur = [ + { role: "user", content: [txt("q1")] }, + toolUse("tu1"), + toolResult("tu1"), + { role: "system", content: `${REM}\n\n${NUDGE}` }, + ]; + const res = afterInline(cur, first); + assert.equal(res.moved ?? 0, 0, "an unbounded gap is not a gap"); + const forwarded = res.messages ?? cur; + assert.deepEqual( + forwarded[forwarded.length - 1], + cur[cur.length - 1], + "the request's final message reaches the model — stripping it is the 400", + ); +}); + +test("BITE — condition (a): an absorbed entry with no stored first-seen form is not a move", () => { + // We can only re-serve what we kept. findJoinMoves is called directly here + // because the condition is about canonical CONTENT, and the shortest honest + // way to state it is to hand it an entry whose `m` was never stored. + const messages = standaloneLeg(); + const primed = classifyPinned(inlineLeg(), null); + const stripped = primed.canonicalEntries.map((e) => (e.r === "system" ? { h: e.h, r: e.r, o: e.o } : e)); + const withM = findJoinMoves({ + messages, + priorCanonical: primed.canonicalEntries, + matched: [{ ci: 2, idx: 2 }, { ci: 4, idx: 4 }], + droppedNow: new Set([3]), + newEntries: [{ index: 3, r: "system" }], + }); + const withoutM = findJoinMoves({ + messages, + priorCanonical: stripped, + matched: [{ ci: 2, idx: 2 }, { ci: 4, idx: 4 }], + droppedNow: new Set([3]), + newEntries: [{ index: 3, r: "system" }], + }); + assert.equal(withM.length, 1, "the control: with the stored form it IS a move"); + assert.equal(withoutM.length, 0); +}); + +// ===================================================================== +// (c) Fires-on-a-non-defect +// ===================================================================== + +test("a genuine mid-history EDIT still takes the edit-shaped reset", () => { + // The discriminator this change moves in front of must not swallow the class + // it was guarding. CC really replaced the standalone's content here; there is + // no join, so nothing is recognised and the reset stands. + const cur = standaloneLeg("a completely different instruction CC substituted"); + const res = afterInline(cur); + assert.equal(res.action, "reset"); + assert.equal(res.resetReason, "edit-shaped"); +}); + +test("traffic with no migration at all is byte-for-byte today's behaviour", () => { + // Plain tail growth over the inline leg: no drop, no join, no move, and the + // forwarded array is the incoming one. + const cur = [...inlineLeg(), { role: "user", content: [txt("q2")] }]; + const res = afterInline(cur); + assert.equal(res.action, "append-only"); + assert.equal(res.moved ?? 0, 0); + assert.deepEqual(res.reserves, []); + assert.deepEqual(res.messages, cur); +}); + +test("BITE — a move stays safe when a LATER extension injects into the forwarded array", () => { + // The regression guard for the tap-point failure this design was rebuilt to + // avoid. deferred-tool-rewrite (order 425) inserts its tool_addition + // announcement after insertion-normalization (order 395) has finished, so + // any outgoing index this extension reports is stale by the time a gate + // reads the final array. Measured on capture s-0d6f38ba n=104: a recorded + // outIndex of 89 addressed the re-served system message here and a + // `user [tool_result, tool_result, text]` in the final array — 98 safety + // violations, every one of them the instrument. + // + // A substitution needs no index to travel, so the gate must stay clean with + // an injection sitting anywhere ahead of the move. + const first = inlineLeg(); + const cur = standaloneLeg(); + const primed = classifyPinned(first, null); + const res = classifyPinned(cur, primed.canonicalEntries); + const injection = { role: "system", content: [{ type: "tool_addition", tool: { type: "tool_reference", name: "WebFetch" } }] }; + const forwarded = [...res.messages]; + forwarded.splice(1, 0, injection); // a later extension, inserting BEFORE the move + + const entries = [ + { n: 0, ts: "t0", key: "k", inMsgs: first, outMsgs: first, inTools: [], outTools: [], stats: primed }, + { n: 1, ts: "t1", key: "k", inMsgs: cur, outMsgs: forwarded, inTools: [], outTools: [], stats: res }, + ]; + assert.equal(res.moved, 1, "the control: this pair really is a move"); + assert.deepEqual(findSafetyViolations(entries), []); + assert.deepEqual(findConservationViolations(entries), []); +}); + +// ===================================================================== +// (d) Moves survive resets — unit 2b +// ===================================================================== +// +// DEFINITION, written before the assertions below (dev-loop "Adding a check"). +// A reset abandons this extension's ORDER model: it stops claiming to know +// where the canonical entries sit relative to the incoming wire. It does NOT +// abandon the CONTENT substitutions the extension is already making — the +// bytes forwarded for a message must not change merely because the order +// model reset, because a cache keys on the longest identical PREFIX and a +// substitution that stops being applied moves the divergence earlier than +// anything CC did. +// +// Threat-matrix row 22 established exactly this for pins (a reset that +// dropped them cost 19 messages; test/insertion-normalization.test.mjs, +// "a reset still forwards PINNED bytes for surviving identities"). A +// recognized MOVE is the same kind of substitution seen one mechanism over: +// the merged message's slot carries the absorbed entry's first-seen bytes, +// one message in and one message out. So the same rule binds it. +// +// Measured cost of getting it wrong, capture s-dc3f8071 (commit 0ebbd8a's +// KNOWN DEFECT note): three otherwise-clean captures reported byte-stability +// violations, all attributed to insertion-normalization and all carrying +// `[CC bytes at outDiv IDENTICAL -> ours]`. Fixture +// reset-move-s-97097e027ac0-196-197.json freezes the pair before the capture +// rotates. + +// Replay a fixture's requests in order through classifyPinned, returning the +// gate-entry shape the five gates read. Same loop the fixture tests above use. +function replayFixture(fixture, key) { + let canon = null; + const entries = []; + for (const r of fixture.requests) { + const res = classifyPinned(r.messages, canon); + entries.push({ + n: r.n, ts: r.ts, key, + inMsgs: r.messages, outMsgs: res.messages ?? r.messages, + inTools: [], outTools: [], + action: res.action, resetReason: res.resetReason ?? null, stats: res, + }); + canon = res.canonicalEntries; + } + return entries; +} + +// The three tests below were TODO from unit 2b until the reserved-entry +// identity build (docs/directives/reserved-entry-identity-directive.md): +// the absorbed entry's identity was (content-hash, role, occurrence-ordinal), +// and by n=197 CC has sent one MORE copy of that entry's text, which took the +// ordinal and re-bound the entry to a message 13 slots away — no move to +// recognize, and a not-subsequence reset as the SYMPTOM (history in the +// fixture's `_mechanism` note). A reserved entry now claims no ordinal in +// CC's array, so the tests assert the criterion directly. The first one's +// original control asserted the reset itself — the symptom's signature — and +// expired with the defect; its control now asserts what the directive +// defines: n=197 must not reset. +test("the n=197 leg: one MORE copy of the reserved text neither re-binds nor resets, and the re-served bytes hold", () => { + // The fixture's own _measured note records the pre-2b verdict: n=197 came + // back moved=0 and the forwarded bytes at wire index 223 flipped from the + // re-served first-seen form back to CC's raw merge, one violation at + // inDiv=233 / outDiv=223 — an output divergence ten messages earlier than + // CC's own. + const entries = replayFixture(RESET_MOVE, "s-dc3f8071"); + const at = (n) => entries.find((e) => e.n === n); + + // The control: the requests before recognize the move, or the assertions + // below are about nothing. + assert.equal(at(195).stats.moved, 1, "control: 195 recognizes the move"); + assert.equal(at(196).stats.moved, 1, "control: 196 recognizes the move"); + + assert.equal(at(197).action, "normalized", "197 no longer resets: a reserved entry claims no ordinal in CC's array"); + assert.equal(at(197).resetReason ?? null, null, "no reset reason — the inversion that tripped not-subsequence cannot form"); + assert.equal(at(197).stats.moved, 1, "the substitution continues as a re-fire"); + + // The property that costs cache, stated positionally: the bytes at the + // merged message's slot are the ones we forwarded on the previous request. + assert.deepEqual( + at(197).outMsgs[223], + at(196).outMsgs[223], + "the re-served first-seen bytes must not flip back to CC's raw merge", + ); + assert.equal(at(197).outMsgs.length, at(197).inMsgs.length, "substitution: one in, one out"); + + assert.deepEqual(findStabilityViolations(entries), []); +}); + +test("the canonical describes the wire we forwarded, so n=198 still sees the move", () => { + // Separate condition, separate assertion. Both rebuild sites state the + // invariant themselves: the canonical they write must describe the array + // just sent. n=197 sent the absorbed entry's bytes at the merged message's + // slot, so the canonical must carry THAT entry there — not a fresh identity + // built from the merge. Get this half wrong and the substitution survives + // exactly one request: the merge becomes canonical, the absorbed entry is + // gone for good, and the flip lands one request later. + const entries = replayFixture(RESET_MOVE, "s-dc3f8071"); + const at = (n) => entries.find((e) => e.n === n); + assert.equal(at(198).stats.moved, 1, "the move is still live on the request after"); + assert.deepEqual( + at(198).outMsgs[223], + at(197).outMsgs[223], + "and the same first-seen bytes are still what we forward", + ); +}); + +test("the n=197 leg passes all five gates", () => { + const entries = replayFixture(RESET_MOVE, "s-dc3f8071"); + assert.deepEqual(findStabilityViolations(entries), []); + assert.deepEqual(findSafetyViolations(entries), []); + assert.deepEqual(findConservationViolations(entries), []); + assert.deepEqual(findSequenceViolations(entries), []); + assert.deepEqual(entries.filter((e) => e.stats.canonOrderViolation).map((e) => e.n), []); +}); + +test("the n=197 leg corrupts nothing — safety, conservation, sequence and canonical order are clean", () => { + // The four gates that held even while the stability defect was open, + // asserted independently of it: whatever stability costs in cache, the + // conversation itself must stay intact and every byte CC sent must stay + // accounted for. This half of the fixture's verdict must never regress. + const entries = replayFixture(RESET_MOVE, "s-dc3f8071"); + assert.deepEqual(findSafetyViolations(entries), []); + assert.deepEqual(findConservationViolations(entries), []); + assert.deepEqual(findSequenceViolations(entries), []); + assert.deepEqual(entries.filter((e) => e.stats.canonOrderViolation).map((e) => e.n), []); + // And the move really is recognized on the legs before, which is what makes + // the tests above statements about n=197 and not about the fixture. + assert.equal(entries.find((e) => e.n === 196).stats.moved, 1); +}); + +// The synthetic reset: the inline leg's order scrambled so `matched` is no +// longer a subsequence, with the move's own neighbourhood left intact. The +// trailing assistant turn moves up to index 1, which inverts one matched pair +// far from the join and forces not-subsequence without disturbing indices +// 3..5. messages[0] deliberately stays put: the gates group by conversation, +// and a conversation's identity is its first message's hash — changing it +// puts the pair in two groups and every re-served byte then reads as +// "invented". (Observed while writing this: the first draft hoisted the +// assistant turn to index 0 and the conservation gate reported two inventions +// that were the harness, not the code.) +const scrambledMoveLeg = (mergedText = `${REM}\n\n${NUDGE}`) => [ + { role: "user", content: [txt("q1")] }, + { role: "assistant", content: [txt("a")] }, + toolUse("tu1"), + toolResult("tu1"), + { role: "system", content: mergedText }, + toolUse("tu2"), + toolResult("tu2"), + { role: "user", content: [txt("q2")] }, +]; + +test("BITE — a not-subsequence reset with a move in it re-serves the first-seen form", () => { + const cur = scrambledMoveLeg(); + const res = afterInline(cur); + assert.equal(res.action, "reset", "control: the scramble really does reset"); + assert.equal(res.resetReason, "not-subsequence"); + assert.equal(res.moved, 1); + assert.ok(res.messages, "a reset carrying a substitution must return an array"); + assert.deepEqual( + res.messages[4], + { role: "system", content: NUDGE }, + "the merged message's slot carries the absorbed entry's first-seen bytes", + ); + // Slot-preserving, the pin argument verbatim: never adds, drops or reorders. + assert.equal(res.messages.length, cur.length); + assert.deepEqual(res.messages.map((m) => m.role), cur.map((m) => m.role)); +}); + +test("BITE — the reset's canonical files the ABSORBED entry at the moved slot, so the move survives into the next request", () => { + // The second half of the change — one the real-bytes fixture no longer + // reaches, since n=197 stopped resetting once reserved entries left wire + // identity; the synthetic scramble keeps it covered. resetKeepingPins states the + // invariant itself: the canonical it writes must describe the array it just + // sent. It sent the absorbed entry's bytes at the merged message's slot, so + // that is what belongs there. File a fresh identity built from the MERGE + // instead and the substitution lasts exactly one request — the merge becomes + // canonical, the absorbed entry is gone, and the next request forwards the + // merge raw. + const primed = classifyPinned(inlineLeg(), null); + const scrambled = scrambledMoveLeg(); + const reset = classifyPinned(scrambled, primed.canonicalEntries); + assert.equal(reset.moved, 1, "control: the reset leg recognized the move"); + + // The conversation carries on in the order the reset just saw, plus a turn. + const next = [...scrambled, { role: "user", content: [txt("q3")] }]; + const res = classifyPinned(next, reset.canonicalEntries); + assert.equal(res.moved, 1, "the absorbed entry is still in the canonical to be re-served"); + assert.deepEqual( + res.messages[4], + { role: "system", content: NUDGE }, + "and the same first-seen bytes go out again — no flip on the request after a reset", + ); +}); + +test("BITE — a reset's move is DECLARED, not merely performed: the gates read it off the stats", () => { + // A substitution the instruments cannot see reads as our bug. The + // conservation gate accounts a merged message's bytes only when the + // suppression is declared (`stats.suppressions`, kind "join-move") — it + // then looks for the join across the forwarded neighbours; undeclared, the + // merged bytes are simply "present in CC's request and in no forwarded + // message". The safety gate reads the same list to know this suppression + // KEEPS its slot rather than shifting the index space. Both were built for + // the success path; a reset that substitutes without declaring is the + // instrument going blind on a path it already covers. + const first = inlineLeg(); + const cur = scrambledMoveLeg(); + const primed = classifyPinned(first, null); + const res = classifyPinned(cur, primed.canonicalEntries); + assert.equal(res.moved, 1, "control: the reset leg really did substitute"); + assert.deepEqual( + res.suppressions.map((s) => ({ index: s.index, kind: s.kind })), + [{ index: 4, kind: "join-move" }], + "the merged message's slot is declared, with the kind that keeps it in the index space", + ); + assert.deepEqual(res.reserves.map((r) => r.index), [4]); + + const entries = [ + { n: 0, ts: "t0", key: "k", inMsgs: first, outMsgs: first, inTools: [], outTools: [], stats: primed }, + { n: 1, ts: "t1", key: "k", inMsgs: cur, outMsgs: res.messages, inTools: [], outTools: [], stats: res }, + ]; + assert.deepEqual(findConservationViolations(entries), []); + assert.deepEqual(findSafetyViolations(entries), []); +}); + +test("BITE — a reset carrying ONLY a move still returns its array", () => { + // Every reset returns `messages` conditionally, and before this change the + // condition was "a pin was applied". A move is the second reason the array + // can differ from what CC sent, and a caller that gets no array forwards the + // raw one — the substitution is performed and then thrown away. + // + // Isolating it needs a reset where the move fires and no pin does: here CC + // keeps the reminder inline on its host AND sends the merged standalone, so + // the host's first-seen form is byte-identical to what arrived and nothing + // is pinned. + const first = inlineLeg(); + const cur = [ + { role: "user", content: [txt("q1")] }, + { role: "assistant", content: [txt("a")] }, + toolUse("tu1"), + toolResult("tu1", [txt(WRAPPED)]), + { role: "system", content: `${REM}\n\n${NUDGE}` }, + toolUse("tu2"), + toolResult("tu2"), + { role: "user", content: [txt("q2")] }, + ]; + const res = classifyPinned(cur, classifyPinned(first, null).canonicalEntries); + assert.equal(res.action, "reset"); + assert.equal(res.pinned, 0, "the isolating condition: no pin applies here"); + assert.equal(res.moved, 1); + assert.ok(res.messages, "a reset whose only change is a move must still carry its array"); + assert.deepEqual(res.messages[4], { role: "system", content: NUDGE }); +}); + +test("BITE — fail-closed: when the scramble collapses the gap bounds, no move is recognized", () => { + // The safety argument for running recognition on the reset path at all. + // Condition (d) bounds the merged message by its matched NEIGHBOURS' wire + // indices; in a request where those neighbours have themselves inverted, + // the bounds cross and nothing can sit inside them. Recognition must then + // decline and the raw bytes must go out — today's behaviour, unchanged. + // Here the tu2 pair is hoisted ahead of the tu1 pair, so the successor's + // wire index falls BELOW the predecessor's. + const cur = [ + { role: "user", content: [txt("q1")] }, + toolUse("tu2"), + toolResult("tu2"), + toolUse("tu1"), + toolResult("tu1"), + { role: "system", content: `${REM}\n\n${NUDGE}` }, + { role: "assistant", content: [txt("a")] }, + { role: "user", content: [txt("q2")] }, + ]; + const res = afterInline(cur); + assert.equal(res.action, "reset"); + assert.equal(res.moved ?? 0, 0, "crossed bounds are not a gap"); + assert.deepEqual( + (res.messages ?? cur)[5], + cur[5], + "the merged message is forwarded raw — the reset path's existing behaviour", + ); +}); + +test("a reset with no move in it forwards exactly what it forwarded before (fires-on-a-non-defect)", () => { + // Same scramble, but the merged text uses an unobserved separator, so + // recognition declines on condition (c) rather than on the reset. Nothing + // about the reset path may change for traffic that has no move in it. + const cur = scrambledMoveLeg(`${REM}\n${NUDGE}`); + const res = afterInline(cur); + assert.equal(res.action, "reset"); + assert.equal(res.resetReason, "not-subsequence"); + assert.equal(res.moved ?? 0, 0); + assert.deepEqual((res.messages ?? cur)[4], cur[4]); +}); + +// ===================================================================== +// (e) Reserved-entry identity — a re-served entry leaves the wire-identity +// space (docs/directives/reserved-entry-identity-directive.md) +// ===================================================================== +// +// DEFINITION, written from the directive before any of it was implemented. +// +// A recognized move keeps an entry ALIVE in our canonical that CC has stopped +// sending. Its stored key is (content-hash, role, occurrence-ordinal-within- +// the-request) — an ordinal is a claim about CC's array, and the entry is not +// in CC's array. So the claim is false the moment CC sends one MORE copy of +// that recurring text: the copy takes the ordinal, the entry binds to it at an +// unrelated position, the move recognition dies (the entry is no longer +// dropped) and the inversion trips not-subsequence. Measured on +// reset-move-s-dc3f8071-196-197.json at n=197 and again at n=400. +// +// THE RULE: a re-served entry's identity is its stored first-seen bytes plus +// the canonical slot where we last forwarded them. It does not participate in +// (hash, role, ordinal) wire matching AT ALL. Marked `rs: true` at the mint. +// +// MINT a recognized move files the absorbed entry at the merged +// message's slot with `rs: true`. The reminder-carrying +// predecessor P is matched normally and is never flagged. +// MATCH EXCLUSION an `rs` entry is neither looked up in the incoming +// identity map nor counted as dropped. A fresh copy of the +// same text therefore matches nothing and classifies as a +// new entry — no re-bind, no inversion, no reset. +// DISPOSITION per request, one of three, checked in this order, over the +// neighbourhood (lo, hi) = the wire indices of the nearest +// preceding and following live MATCHED canonical entries: +// 1 RE-FIRE a wire message strictly inside carries the +// merged form -> substitute the stored bytes +// into that slot, declare `join-move`, keep rs. +// 2 RECLAIM a wire message strictly inside carries D's +// whole first-seen text -> clear rs, bind D to +// that index as an ordinary matched entry, and +// REWRITE its stored key from that message's +// incoming identity. +// 3 LAPSE neighbourhood resolvable, neither form +// present -> the entry is not carried into the +// rebuilt canonical. Never re-serve into a +// context that no longer carries the region. +// Bounds unresolvable or crossed -> the pass does NOTHING +// for this entry this request: no substitution, no state +// change, raw forward. Fail-closed. +// ROLE (f) the merged wire message's role and the absorbed entry's +// stored role must both be "system" — the only measured +// shape. Applies at the mint and to both probes. + +// The canonical after ONE recognized move: the absorbed NUDGE entry is filed +// at the merged message's slot, marked reserved. +const afterMove = () => { + const primed = classifyPinned(inlineLeg(), null); + return classifyPinned(standaloneLeg(), primed.canonicalEntries); +}; +const reservedIn = (entries) => (entries ?? []).filter((e) => e.rs); +// "First-seen bytes" means exactly what CC sent the first time — the message +// object at index 3 of the inline leg, shape and all. Naming it from the leg +// rather than re-typing a literal keeps the expectation parented on the +// definition instead of on whatever the pin happens to store. +const FIRST_SEEN = inlineLeg()[3]; +// Request 3 shapes. Each keeps a growth tail so the pair is never a drop-only +// shrink, and none disturbs indices 0..3 unless the case says so. +const thirdLeg = (msgs) => [...msgs, { role: "assistant", content: [txt("a2")] }]; + +test("BITE — MINT: a recognized move files the absorbed entry with rs:true, and P is never flagged", () => { + const moved = afterMove(); + assert.equal(moved.moved, 1, "control: this really is a recognized move"); + const reserved = reservedIn(moved.canonicalEntries); + assert.equal(reserved.length, 1, "exactly one entry is reserved — the absorbed one"); + assert.deepEqual(reserved[0].m, FIRST_SEEN, + "and it carries the absorbed entry's first-seen bytes, not the merge's"); + assert.equal(moved.canonicalEntries[3].rs, true, "filed at the merged message's SLOT"); + assert.ok(!moved.canonicalEntries[2].rs, "P — the reminder-carrying predecessor — is matched normally"); +}); + +test("BITE — MATCH EXCLUSION: one MORE copy of the reserved text does not re-bind it", () => { + // THE MEASURED DEFECT, in miniature. n=197's eighth copy of a recurring + // nudge took the ordinal the reserved entry's key claimed, bound it 13 slots + // away, and tripped not-subsequence. The copy here sits at the TAIL, well + // outside the reserved entry's neighbourhood, so nothing about it is a + // reclaim — it is an unrelated recurrence and must classify as a new entry. + const moved = afterMove(); + const cur = thirdLeg([...standaloneLeg(), { role: "system", content: NUDGE }]); + const res = classifyPinned(cur, moved.canonicalEntries); + + assert.notEqual(res.action, "reset", "the re-bind is what caused the reset; excluded, there is none"); + assert.equal(res.moved, 1, "and the re-serve survives the extra copy"); + assert.deepEqual(res.messages[3], FIRST_SEEN, + "the merged slot still carries the first-seen bytes"); + assert.equal(reservedIn(res.canonicalEntries).length, 1, "still exactly one reserved entry"); +}); + +test("BITE — RE-FIRE: the merged form still on the wire re-serves the stored bytes, declared", () => { + const moved = afterMove(); + const cur = thirdLeg(standaloneLeg()); + const res = classifyPinned(cur, moved.canonicalEntries); + + assert.equal(res.moved, 1, "the disposition pass re-fires without findJoinMoves seeing a drop"); + assert.deepEqual(res.messages[3], FIRST_SEEN); + assert.equal(res.messages.length, cur.length, "substitution: one message in, one out"); + const decl = (res.suppressions ?? []).filter((s) => s.kind === "join-move"); + assert.deepEqual(decl.map((s) => s.index), [3], "DECLARED — the gates read the join off this array"); + assert.deepEqual((res.reserves ?? []).map((r) => r.index), [3]); + assert.equal(res.canonicalEntries[3].rs, true, "and stays reserved, so the next request can re-fire too"); +}); + +test("BITE — RECLAIM: CC flips back to the original form, so the entry rejoins wire identity", () => { + // The oscillation leg. The standalone nudge is on the wire again, strictly + // inside the neighbourhood, carrying exactly the reserved entry's first-seen + // text. That is not new content and not a move — it is the entry itself, + // back. It must stop being reserved and its stored key must be rewritten + // from THIS message's incoming identity, or the next request's absolute + // lookup misses it and the whole cycle restarts. + const moved = afterMove(); + const cur = thirdLeg(inlineLeg()); + const res = classifyPinned(cur, moved.canonicalEntries); + + assert.equal(reservedIn(res.canonicalEntries).length, 0, "rs cleared"); + assert.deepEqual(res.messages ?? cur, cur, "CC's own bytes go out — nothing to substitute"); + const at3 = res.canonicalEntries[3]; + assert.deepEqual(at3.m, FIRST_SEEN, "same entry, same stored bytes"); + + // What separates a RECLAIM from a LAPSE that happens to be followed by a + // fresh entry with the same bytes — and the two are otherwise + // indistinguishable in this shape, which is how the first draft of this bite + // survived the mutation that deleted the reclaim. The entry BINDS: it is an + // ordinary matched entry, so the message at that index is not an insertion + // and the request is a plain tail append. Under a lapse it would be a new + // spliced entry mid-history and the request would classify as normalized. + assert.equal(res.inserted, 1, "only the tail turn is new — the reclaimed message is MATCHED"); + assert.equal(res.action, "append-only", "nothing was spliced, nothing substituted"); + + // The key really is the incoming one: a FOURTH request with the same shape + // matches it absolutely, with no disposition pass involved. + const res2 = classifyPinned(thirdLeg(inlineLeg()), res.canonicalEntries); + assert.notEqual(res2.action, "reset"); + assert.equal(res2.moved ?? 0, 0, "no re-serve — the entry is an ordinary matched entry now"); + assert.equal(res2.dropped ?? 0, 0, "and it is not dropped either: it matched"); +}); + +test("BITE — LAPSE: the region is gone, so the entry is dropped rather than re-served", () => { + // Fails CLOSED in the direction that matters for the threat model: never + // re-serve stored bytes into a context CC has pruned or edited away. + const moved = afterMove(); + const cur = thirdLeg(standaloneLeg("something else entirely")); + const res = classifyPinned(cur, moved.canonicalEntries); + + assert.equal(res.moved ?? 0, 0, "no re-serve"); + assert.deepEqual((res.messages ?? cur)[3], cur[3], "CC's own bytes at the slot, untouched"); + assert.equal(reservedIn(res.canonicalEntries).length, 0, "the entry is not carried forward"); +}); + +test("BITE — FAIL-CLOSED: an unresolvable neighbourhood changes nothing at all", () => { + // The successor bound cannot be resolved: everything after the merged + // message is gone, so there is no following matched canonical entry. The + // directive's rule is NOTHING — no substitution AND no state change, so the + // entry survives, still reserved, for a request that can resolve it. + const moved = afterMove(); + const cur = [ + { role: "user", content: [txt("q1")] }, + toolUse("tu1"), + toolResult("tu1"), + { role: "system", content: `${REM}\n\n${NUDGE}` }, + ]; + const res = classifyPinned(cur, moved.canonicalEntries); + + assert.equal(res.moved ?? 0, 0, "no substitution"); + assert.deepEqual((res.messages ?? cur)[3], cur[3], "the merged message is forwarded RAW"); + assert.equal(reservedIn(res.canonicalEntries).length, 1, "and no state change: still reserved"); +}); + +test("BITE — role (f): a merged message in a non-system role is not a move", () => { + const primed = classifyPinned(inlineLeg(), null); + const cur = standaloneLeg().map((m, i) => + i === 3 ? { role: "developer", content: `${REM}\n\n${NUDGE}` } : m); + const res = classifyPinned(cur, primed.canonicalEntries); + assert.equal(res.moved ?? 0, 0, "the only measured shape is system -> system"); + assert.equal(reservedIn(res.canonicalEntries).length, 0); +}); + +test("BITE — role (f): an absorbed entry whose stored role is not system is not a move", () => { + const first = inlineLeg().map((m, i) => + i === 3 ? { role: "developer", content: NUDGE } : m); + const primed = classifyPinned(first, null); + const res = classifyPinned(standaloneLeg(), primed.canonicalEntries); + assert.equal(res.moved ?? 0, 0); + assert.equal(reservedIn(res.canonicalEntries).length, 0); +}); + +test("BITE — role (f): a non-system candidate inside the gap is neither a re-fire nor a reclaim", () => { + const moved = afterMove(); + const cur = thirdLeg(standaloneLeg()).map((m, i) => + i === 3 ? { role: "developer", content: `${REM}\n\n${NUDGE}` } : m); + const res = classifyPinned(cur, moved.canonicalEntries); + assert.equal(res.moved ?? 0, 0, "the probes carry the same role constraint as the mint"); + assert.deepEqual((res.messages ?? cur)[3], cur[3], "raw bytes out"); +}); + +test("a reserved entry never reports as dropped, and never as a canonical-order violation", () => { + // Two counters that read the canonical. `dropped` is a claim about CC's + // array and a reserved entry is not in it — reporting one would show a prune + // that did not happen. `canonOrderViolation` maps canonical entries to wire + // indices BY KEY, and a reserved entry's key is explicitly no longer + // load-bearing, so a stale key that happens to collide must not be read as + // our state model drifting. + const moved = afterMove(); + const cur = thirdLeg([...standaloneLeg(), { role: "system", content: NUDGE }]); + const res = classifyPinned(cur, moved.canonicalEntries); + assert.equal(res.dropped ?? 0, 0); + assert.equal(res.canonOrderViolation, null); +}); + +test("traffic that never recognized a move is byte-for-byte today's behaviour (fires-on-a-non-defect)", () => { + // The disposition pass must be invisible where there is nothing reserved. + const primed = classifyPinned(inlineLeg(), null); + assert.equal(reservedIn(primed.canonicalEntries).length, 0); + const grown = thirdLeg(inlineLeg()); + const res = classifyPinned(grown, primed.canonicalEntries); + assert.equal(res.action, "append-only"); + assert.equal(res.moved ?? 0, 0); + assert.deepEqual(res.messages, grown); +}); diff --git a/test/insertion-merge-suppression.test.mjs b/test/insertion-merge-suppression.test.mjs new file mode 100644 index 00000000..282ec93b --- /dev/null +++ b/test/insertion-merge-suppression.test.mjs @@ -0,0 +1,265 @@ +// insertion-merge-suppression — the merged-standalone shape (587k window, +// capture s-633915a8, msg864). Sibling to insertion-suppression.test.mjs's +// single-block case, but here CC migrates ALL of a message's volatile +// blocks out TOGETHER, joined into one standalone message, rather than one +// standalone per block. The single-block pinnedHashes set can never match +// that shape (it hashes one block at a time); this file exercises the +// join-hash set added alongside it (pinnedJoinHashes / findSuppressibleDuplicate's +// third argument). +// +// Design settled by the dispatcher after the 587k premise was corrected +// (BACKLOG.md, "merged-reminder standalone, join-hash design settled"): for +// each pinned entry with >=2 volatile blocks, also hash the concatenation of +// ALL its volatile blocks' wrapper-stripped texts, in WIRE order, joined +// with "\n\n" — the exact separator measured on the real merged standalone. +// No subset-merges, no other separators — this is the one observed shape, +// not a general N-ary merge grammar. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { readFileSync } from "node:fs"; +import { dirname, join } from "node:path"; +import { fileURLToPath } from "node:url"; + +import { + classifyPinned, + pinnedBlockHashes, + pinnedJoinHashes, + findSuppressibleDuplicate, +} from "../proxy/extensions/insertion-normalization.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const FIXTURE_PATH = join(__dirname, "fixtures", "harvested", "oscillation-s-4b6a435234bf-863.json"); +const fixture = JSON.parse(readFileSync(FIXTURE_PATH, "utf-8")); + +// The real msg863 form (1243B-shaped: tool_result + two +// blocks, PreToolUse and PostToolUse) and the real msg864 merged standalone +// (627 chars, both reminders wrapper-stripped and joined with "\n\n") — +// pulled from the fixture rather than retyped, so the bite is the actual +// measured bytes, not a paraphrase of them. +const REAL_MSG863 = fixture.requests[0].msg863; +const REAL_MERGED_STANDALONE = fixture.requests_864.find((r) => r.msg864.role === "system").msg864; + +// --- Helpers (mirrors test/insertion-suppression.test.mjs's idiom) --- + +function assistantToolUse(id) { + return { role: "assistant", content: [{ type: "tool_use", id, name: "Agent", input: {} }] }; +} + +function userMsg(text) { + return { role: "user", content: [{ type: "text", text }] }; +} + +const REMINDER_PRE = "\nPreToolUse: first reminder\n"; +const REMINDER_POST = "\nPostToolUse: second reminder\n"; + +function withTwoReminders(text) { + return { + role: "user", + content: [ + { type: "text", text }, + { type: "text", text: REMINDER_PRE }, + { type: "text", text: REMINDER_POST }, + ], + }; +} + +function pinCanon(messages) { + return classifyPinned(messages, null).canonicalEntries; +} + +// ===================================================================== +// (a) Bite from the REAL fixture bytes +// ===================================================================== + +test("RED against the old (2-arg) call: the real merged standalone does not match single-block hashes alone", () => { + // The tool_use id in the real fixture's msg863 pairs it with an + // assistant Agent-spawn — reproduced here only so classifyPinned's + // adjacency check accepts the array; the message content itself is the + // fixture's own, unmodified. + const toolUseId = REAL_MSG863.content[0].tool_use_id; + const canon = pinCanon([assistantToolUse(toolUseId), REAL_MSG863]); + const pinnedHashes = pinnedBlockHashes(canon); + + // Old call shape (no third argument) — this is exactly what production + // ran before the join-hash set existed, and it is what left + // suppressed:0 across all 560 events of the real session. + const h = findSuppressibleDuplicate(REAL_MERGED_STANDALONE, pinnedHashes); + assert.equal(h, null, "single-block hashes alone must not match a merged standalone — this IS the observed gap"); +}); + +test("GREEN: the real merged standalone matches the join-hash of its pinned entry", () => { + const toolUseId = REAL_MSG863.content[0].tool_use_id; + const canon = pinCanon([assistantToolUse(toolUseId), REAL_MSG863]); + const pinnedHashes = pinnedBlockHashes(canon); + const joinHashes = pinnedJoinHashes(canon); + + assert.equal(joinHashes.size, 1, "msg863's entry has exactly 2 volatile blocks -> exactly one join hash"); + + const h = findSuppressibleDuplicate(REAL_MERGED_STANDALONE, pinnedHashes, joinHashes); + assert.notEqual(h, null, "the real merged standalone must be recognized as a suppressible duplicate"); +}); + +test("classifyPinned end-to-end: the real merged standalone is suppressed as a new entry, not forwarded twice (MID-HISTORY — matches the real capture, which had dozens of messages after msg864)", () => { + const toolUseId = REAL_MSG863.content[0].tool_use_id; + const canon = pinCanon([assistantToolUse(toolUseId), REAL_MSG863]); + + // A trailing turn after the standalone, so it sits at a genuine + // mid-history position (index 2 of 4) rather than the array's final + // index — the real capture had ~57 more messages after msg864. The + // tail-guard test below covers the DIFFERENT real incident where the + // duplicate IS the final message. + const messages = [ + assistantToolUse(toolUseId), + REAL_MSG863, + { ...REAL_MERGED_STANDALONE }, + { role: "assistant", content: [{ type: "text", text: "a-after" }] }, + ]; + const result = classifyPinned(messages, canon); + + assert.equal(result.suppressed, 1, "the merged standalone must be counted as a suppression"); + assert.equal(result.suppressions.length, 1); + assert.equal(result.suppressions[0].index, 2); + // The pinned inline form (index 1) already carries both reminders; the + // standalone must not also appear in the forwarded array. + assert.equal(result.messages.length, 3, "the standalone must not be forwarded alongside the pinned inline form"); +}); + +// ===================================================================== +// TAIL GUARD (BACKLOG.md, "suppression can strip a request's FINAL +// message", 2026-07-30) — the join-hash-specific case. Three real 400s +// traced to suppression removing a resume request's ONLY/new final +// message, leaving the forwarded array ending on the prior assistant +// turn -> upstream "must end with a user message". A tail-position +// duplicate is the request's live payload, not a stray migration copy. +// ===================================================================== + +test("TAIL GUARD: the real merged standalone as the FINAL message is never suppressed", () => { + const toolUseId = REAL_MSG863.content[0].tool_use_id; + const canon = pinCanon([assistantToolUse(toolUseId), REAL_MSG863]); + + const messages = [assistantToolUse(toolUseId), REAL_MSG863, { ...REAL_MERGED_STANDALONE }]; + const result = classifyPinned(messages, canon); + + assert.equal(result.suppressed, 0, "a final-position merged duplicate must be forwarded, not suppressed"); + assert.equal(result.messages.length, 3, "the standalone must remain on the wire as the live final message"); + assert.equal( + result.messages[result.messages.length - 1].content, + REAL_MERGED_STANDALONE.content, + "the final message content is unchanged", + ); +}); + +// ===================================================================== +// (b) Regression: single-reminder standalone still matches (unchanged path) +// ===================================================================== + +test("REGRESSION: a single-reminder standalone still matches via pinnedHashes even though joinHashes is now also passed", () => { + const REMINDER_INNER = "PreToolUse:Edit hook additional context: file changed"; + const REMINDER = `\n${REMINDER_INNER}\n`; + const singleReminderMsg = { + role: "user", + content: [ + { type: "text", text: "tool result" }, + { type: "text", text: REMINDER }, + ], + }; + const canon = pinCanon([singleReminderMsg, { role: "assistant", content: [{ type: "text", text: "a1" }] }]); + const pinnedHashes = pinnedBlockHashes(canon); + const joinHashes = pinnedJoinHashes(canon); + + assert.equal(joinHashes.size, 0, "a single volatile block never produces a join hash"); + + const standalone = { role: "system", content: [{ type: "text", text: REMINDER_INNER }] }; + const h = findSuppressibleDuplicate(standalone, pinnedHashes, joinHashes); + assert.notEqual(h, null, "the existing single-block suppression path must be unaffected"); +}); + +// ===================================================================== +// (c) Guard: a join of blocks from TWO DIFFERENT entries is NOT suppressed +// ===================================================================== + +test("GUARD: concatenating volatile blocks from two DIFFERENT pinned entries does not suppress — identity is per-entry", () => { + // Two separate messages, each carrying exactly ONE of the two reminders + // (as opposed to withTwoReminders, which puts both on the SAME entry). + const entryA = { + role: "user", + content: [{ type: "text", text: "result A" }, { type: "text", text: REMINDER_PRE }], + }; + const entryB = { + role: "user", + content: [{ type: "text", text: "result B" }, { type: "text", text: REMINDER_POST }], + }; + const canon = pinCanon([ + entryA, + { role: "assistant", content: [{ type: "text", text: "a1" }] }, + entryB, + { role: "assistant", content: [{ type: "text", text: "a2" }] }, + ]); + const pinnedHashes = pinnedBlockHashes(canon); + const joinHashes = pinnedJoinHashes(canon); + + assert.equal(joinHashes.size, 0, "neither entry has >=2 volatile blocks of its own -> no join hash from either"); + + // A candidate that tries to forge the join by pasting bytes from BOTH + // entries together. + const forged = { + role: "system", + content: "PreToolUse: first reminder\n\nPostToolUse: second reminder", + }; + const h = findSuppressibleDuplicate(forged, pinnedHashes, joinHashes); + assert.equal(h, null, "a cross-entry concatenation must never be treated as a suppressible duplicate"); +}); + +// ===================================================================== +// (d) Guard: a genuinely different concatenation is NOT suppressed +// ===================================================================== + +test("GUARD: wrong order, wrong separator, or extra content — none of them suppress", () => { + const canon = pinCanon([withTwoReminders("tool result"), { role: "assistant", content: [{ type: "text", text: "a1" }] }]); + const pinnedHashes = pinnedBlockHashes(canon); + const joinHashes = pinnedJoinHashes(canon); + assert.equal(joinHashes.size, 1); + + const reversedOrder = { + role: "system", + content: "PostToolUse: second reminder\n\nPreToolUse: first reminder", + }; + assert.equal(findSuppressibleDuplicate(reversedOrder, pinnedHashes, joinHashes), null, "reversed order must not match"); + + const wrongSeparator = { + role: "system", + content: "PreToolUse: first reminder\nPostToolUse: second reminder", + }; + assert.equal( + findSuppressibleDuplicate(wrongSeparator, pinnedHashes, joinHashes), + null, + "a single-newline join (unobserved separator) must not match", + ); + + const extraContent = { + role: "system", + content: "PreToolUse: first reminder\n\nPostToolUse: second reminder\n\nextra", + }; + assert.equal(findSuppressibleDuplicate(extraContent, pinnedHashes, joinHashes), null, "extra trailing content must not match"); +}); + +// ===================================================================== +// pinnedJoinHashes unit bites (mirrors pinnedBlockHashes's own tests) +// ===================================================================== + +test("pinnedJoinHashes: a dropped entry's join is excluded — its content is not being served anywhere", () => { + const canon1 = pinCanon([ + withTwoReminders("tool result"), + { role: "assistant", content: [{ type: "text", text: "a1" }] }, + userMsg("u2"), + { role: "assistant", content: [{ type: "text", text: "a3" }] }, + ]); + const pruned = classifyPinned( + [{ role: "assistant", content: [{ type: "text", text: "a1" }] }, userMsg("u2"), { role: "assistant", content: [{ type: "text", text: "a3" }] }, userMsg("tail")], + canon1, + ); + assert.equal(pruned.dropped, 1); + const joinHashes = pinnedJoinHashes(pruned.canonicalEntries); + assert.equal(joinHashes.size, 0, "a dropped pin's join must not be treated as currently live"); +}); diff --git a/test/insertion-normalization.test.mjs b/test/insertion-normalization.test.mjs new file mode 100644 index 00000000..65bdf259 --- /dev/null +++ b/test/insertion-normalization.test.mjs @@ -0,0 +1,995 @@ +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { mkdtemp, readFile, rm } from "node:fs/promises"; +import { tmpdir } from "node:os"; +import { dirname, join } from "node:path"; +import { fileURLToPath } from "node:url"; + +import ext, { + computeIdentities, + classifyInsertion, + classifyPinned, + isVolatileBlock, + validateToolAdjacency, + resolveInsertionSessionKey, +} from "../proxy/extensions/insertion-normalization.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); + +// --- Helpers --- + +function userMsg(text) { + return { role: "user", content: [{ type: "text", text }] }; +} +function assistantMsg(text) { + return { role: "assistant", content: [{ type: "text", text }] }; +} +function toolUseMsg(id, name = "Bash") { + return { role: "assistant", content: [{ type: "tool_use", id, name, input: {} }] }; +} +function toolResultMsg(toolUseId, text = "result") { + return { role: "user", content: [{ type: "tool_result", tool_use_id: toolUseId, content: text }] }; +} + +function conv(n, seed = "c") { + const out = []; + for (let i = 0; i < n; i++) { + out.push(i % 2 === 0 ? userMsg(`${seed}-u${i}`) : assistantMsg(`${seed}-a${i}`)); + } + return out; +} + +async function newTmp() { + return mkdtemp(join(tmpdir(), "insertion-norm-test-")); +} + +function withEnv(overrides, fn) { + const saved = {}; + for (const k of Object.keys(overrides)) { + saved[k] = process.env[k]; + if (overrides[k] === undefined) delete process.env[k]; + else process.env[k] = overrides[k]; + } + try { + return fn(); + } finally { + for (const k of Object.keys(saved)) { + if (saved[k] === undefined) delete process.env[k]; + else process.env[k] = saved[k]; + } + } +} + +async function withEnvAsync(overrides, fn) { + const saved = {}; + for (const k of Object.keys(overrides)) { + saved[k] = process.env[k]; + if (overrides[k] === undefined) delete process.env[k]; + else process.env[k] = overrides[k]; + } + try { + return await fn(); + } finally { + for (const k of Object.keys(saved)) { + if (saved[k] === undefined) delete process.env[k]; + else process.env[k] = saved[k]; + } + } +} + +async function silenced(fn) { + const orig = process.stderr.write.bind(process.stderr); + process.stderr.write = () => true; + try { + return await fn(); + } finally { + process.stderr.write = orig; + } +} + +async function runExt(body, { headers, dir } = {}) { + const savedHome = process.env.CLAUDE_CONFIG_DIR; + if (dir) process.env.CLAUDE_CONFIG_DIR = dir; + try { + const ctx = { body, meta: {}, headers: headers || {} }; + await ext.onRequest(ctx); + return ctx; + } finally { + if (dir) { + if (savedHome === undefined) delete process.env.CLAUDE_CONFIG_DIR; + else process.env.CLAUDE_CONFIG_DIR = savedHome; + } + } +} + +// ===================================================================== +// Pure classifier tests +// ===================================================================== + +test("pure append: canonical is a strict prefix, no splice -> action append-only, messages unchanged", () => { + const prior = conv(10, "append"); + const priorCanon = computeIdentities(prior).map((e) => ({ h: e.h, r: e.r, o: e.o })); + const incoming = prior.concat(conv(2, "append-tail")); + + const result = classifyInsertion(incoming, priorCanon); + assert.equal(result.action, "append-only"); + assert.deepEqual(result.messages, incoming); + assert.equal(result.inserted, 2); +}); + +test("single user-role mid-insertion: normalized to tail, cache-relevant prefix byte-identical to canonical", () => { + const prior = conv(10, "mid"); + const priorCanon = computeIdentities(prior).map((e) => ({ h: e.h, r: e.r, o: e.o })); + + // Splice one new user message between prior[4] and prior[5]. + const incoming = prior.slice(0, 5).concat([userMsg("mid-inserted")], prior.slice(5)); + + const result = classifyInsertion(incoming, priorCanon); + assert.equal(result.action, "normalized"); + assert.equal(result.inserted, 1); + // Cache-relevant prefix: canonical order first, byte-identical to `prior`. + assert.deepEqual(result.messages.slice(0, prior.length), prior); + // New entry appended at the tail. + assert.deepEqual(result.messages[prior.length], userMsg("mid-inserted")); +}); + +test("multiple insertions keep relative order", () => { + const prior = conv(10, "multi"); + const priorCanon = computeIdentities(prior).map((e) => ({ h: e.h, r: e.r, o: e.o })); + + const insertA = userMsg("insert-A"); + const insertB = userMsg("insert-B"); + // Both spliced between prior[3] and prior[4], in order A then B. + const incoming = prior.slice(0, 4).concat([insertA, insertB], prior.slice(4)); + + const result = classifyInsertion(incoming, priorCanon); + assert.equal(result.action, "normalized"); + assert.equal(result.inserted, 2); + assert.deepEqual(result.messages.slice(0, prior.length), prior); + assert.deepEqual(result.messages[prior.length], insertA); + assert.deepEqual(result.messages[prior.length + 1], insertB); +}); + +test("assistant-role insertion -> reset (never reorders an assistant message)", () => { + const prior = conv(10, "asst"); + const priorCanon = computeIdentities(prior).map((e) => ({ h: e.h, r: e.r, o: e.o })); + + const incoming = prior.slice(0, 4).concat([assistantMsg("unexpected-assistant-insert")], prior.slice(4)); + + const result = classifyInsertion(incoming, priorCanon); + assert.equal(result.action, "reset"); + assert.equal(result.resetReason, "assistant-interleaved"); +}); + +test("shrunk history (fewer messages than canonical) -> reset", () => { + const prior = conv(10, "shrink"); + const priorCanon = computeIdentities(prior).map((e) => ({ h: e.h, r: e.r, o: e.o })); + + const incoming = prior.slice(0, 6); // fewer than canonical's 10 entries + const result = classifyInsertion(incoming, priorCanon); + assert.equal(result.action, "reset"); + // A shorter array cannot contain every canonical identity, so it fails + // the subsequence match. + assert.equal(result.resetReason, "not-subsequence"); +}); + +test("tool_result adjacency violation -> reset even when insertion would otherwise qualify", () => { + // Canonical ends on a plain user turn (u3) that is NOT part of the + // tool_use/tool_result pair — this is what makes the inserted entries + // count as a genuine mid-canonical splice (index <= lastMatched) rather + // than ordinary tail growth, so the splice path (and its adjacency + // check) actually runs. + const tu = toolUseMsg("tu-1"); + const trOrig = toolResultMsg("tu-1", "orig-result"); + const u3 = userMsg("u3-final-canonical"); + const prior = [userMsg("p0"), tu, trOrig, u3]; + const priorCanon = computeIdentities(prior).map((e) => ({ h: e.h, r: e.r, o: e.o })); + + // Two new user-role entries spliced between trOrig and u3: an unrelated + // message, then a DIFFERENT tool_result for the same tu-1 id (content + // differs from trOrig, so it doesn't match that canonical identity and + // is treated as new). Re-serializing (canonical order + new entries + // appended) would place the unrelated message directly before this new + // tool_result, separating it from its tool_use — must reset instead. + const otherNew = userMsg("unrelated queued message"); + const trDiffering = toolResultMsg("tu-1", "different-late-result"); + const incoming = [userMsg("p0"), tu, trOrig, otherNew, trDiffering, u3]; + + const result = classifyInsertion(incoming, priorCanon); + assert.equal(result.action, "reset"); + assert.equal(result.resetReason, "adjacency-violation"); +}); + +test("validateToolAdjacency: true for well-formed tool_use/tool_result pairing", () => { + const tu = toolUseMsg("tu-2"); + const tr = toolResultMsg("tu-2"); + assert.equal(validateToolAdjacency([userMsg("a"), tu, tr]), true); +}); + +test("validateToolAdjacency: false when tool_result's preceding message isn't the matching tool_use", () => { + const tu = toolUseMsg("tu-3"); + const tr = toolResultMsg("tu-3"); + assert.equal(validateToolAdjacency([userMsg("a"), tu, userMsg("intervening"), tr]), false); +}); + +test("duplicate identical user messages disambiguated by occurrence counter", () => { + const dup = userMsg("same text every time"); + const prior = [userMsg("p0"), dup, userMsg("p2"), dup]; + const identities = computeIdentities(prior); + // Both `dup` entries share the same hash+role but must get distinct + // occurrence indices (0 and 1). + const dupEntries = identities.filter((e) => e.h === identities[1].h && e.r === "user"); + assert.deepEqual( + dupEntries.map((e) => e.o).sort(), + [0, 1], + ); +}); + +test("no prior canonical -> reset with reason no-prior-canonical (first request in a session)", () => { + const incoming = conv(4, "first"); + const result = classifyInsertion(incoming, null); + assert.equal(result.action, "reset"); + assert.equal(result.resetReason, "no-prior-canonical"); + assert.equal(result.canonicalEntries.length, 4); +}); + +// ===================================================================== +// Extension-level tests (env gate, persistence, telemetry) +// ===================================================================== + +test("gate off: CACHE_FIX_INSERTION_NORMALIZE unset -> passthrough byte-identical, no telemetry file written", async () => { + const dir = await newTmp(); + try { + const messages = conv(6, "gate-off"); + const body = { model: "claude-opus-4-7", messages }; + const before = JSON.stringify(body); + + let ctx; + await withEnvAsync({ CACHE_FIX_INSERTION_NORMALIZE: undefined }, async () => { + ctx = await runExt(body, { dir }); + }); + + assert.equal(JSON.stringify(body), before, "body must be untouched when gate is off"); + assert.equal(ctx.meta.insertionNormalizeStats, undefined, "no telemetry when gate is off"); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("canonical persistence round-trip: write, reload, continue (append-only across two requests)", async () => { + const dir = await newTmp(); + try { + const headers = { "x-claude-code-session-id": "sess-roundtrip" }; + const messages1 = conv(6, "rt"); + const body1 = { model: "claude-opus-4-7", messages: messages1 }; + + let ctx1; + await silenced(() => + withEnvAsync({ CACHE_FIX_INSERTION_NORMALIZE: "1" }, async () => { + ctx1 = await runExt(body1, { headers, dir }); + }), + ); + assert.equal(ctx1.meta.insertionNormalizeStats.action, "reset"); + assert.equal(ctx1.meta.insertionNormalizeStats.resetReason, "no-prior-canonical"); + + // Second request: pure append of 2 more messages. Canonical was + // persisted by request 1 — this call must reload it from disk (fresh + // ctx, same extension module) rather than relying on in-memory state. + const messages2 = messages1.concat(conv(2, "rt-tail")); + const body2 = { model: "claude-opus-4-7", messages: messages2 }; + let ctx2; + await silenced(() => + withEnvAsync({ CACHE_FIX_INSERTION_NORMALIZE: "1" }, async () => { + ctx2 = await runExt(body2, { headers, dir }); + }), + ); + assert.equal(ctx2.meta.insertionNormalizeStats.action, "append-only"); + assert.equal(ctx2.meta.insertionNormalizeStats.inserted, 2); + assert.equal(JSON.stringify(body2.messages), JSON.stringify(messages2)); + + // Third request: a real mid-history splice — must reload request 2's + // persisted canonical (8 entries) and correctly detect the splice. + // Insert BEFORE the last two canonical entries (not at the tail) so + // this is a genuine splice, not ordinary append growth. + const spliced = messages2 + .slice(0, 6) + .concat([userMsg("late-splice")], messages2.slice(6)); + const body3 = { model: "claude-opus-4-7", messages: spliced }; + let ctx3; + await silenced(() => + withEnvAsync({ CACHE_FIX_INSERTION_NORMALIZE: "1" }, async () => { + ctx3 = await runExt(body3, { headers, dir }); + }), + ); + assert.equal(ctx3.meta.insertionNormalizeStats.action, "normalized"); + assert.equal(ctx3.meta.insertionNormalizeStats.inserted, 1); + assert.deepEqual(body3.messages.slice(0, messages2.length), messages2); + assert.deepEqual(body3.messages[messages2.length], userMsg("late-splice")); + + // Telemetry file exists with 3 lines, one per action. No system prompt + // was set on any of the three bodies and all three share one msgs[0], so + // all three land in the same bucket. The key is DERIVED rather than + // spelled out: it carries a conversation sub-key now, and hardcoding the + // format made this test fail on a keying change that broke nothing. + const key = resolveInsertionSessionKey(headers, body3.messages, body3.system); + const telemetryFile = join(dir, "cache-fix-snapshots", `${key}-insertion-events.jsonl`); + const lines = (await readFile(telemetryFile, "utf-8")).trim().split("\n"); + assert.equal(lines.length, 3); + const actions = lines.map((l) => JSON.parse(l).action); + assert.deepEqual(actions, ["reset", "append-only", "normalized"]); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("session key resolution: session-id header takes precedence over content-hash fallback", () => { + const messages = conv(4, "key"); + const withHeader = resolveInsertionSessionKey({ "x-claude-code-session-id": "abc123" }, messages); + const withoutHeader = resolveInsertionSessionKey({}, messages); + assert.notEqual(withHeader, withoutHeader); + assert.ok(withHeader.startsWith("s-")); + assert.ok(withoutHeader.startsWith("c-")); +}); + +// ===================================================================== +// Sidecar sub-keying (threat-matrix row 14) +// ===================================================================== + +test("session key resolution: same session-id, different system prompt -> different sub-key", () => { + const messages = conv(4, "sidecar-key"); + const headers = { "x-claude-code-session-id": "shared-sid" }; + const mainKey = resolveInsertionSessionKey(headers, messages, [{ type: "text", text: "You are Claude Code" }]); + const sidecarKey = resolveInsertionSessionKey(headers, messages, [{ type: "text", text: "Generate a short title" }]); + assert.notEqual(mainKey, sidecarKey); + assert.ok(mainKey.startsWith("s-shared-sid-")); + assert.ok(sidecarKey.startsWith("s-shared-sid-")); +}); + +test("session key resolution: same session-id + same system prompt -> same sub-key (stable across calls)", () => { + const messages = conv(4, "stable-key"); + const headers = { "x-claude-code-session-id": "shared-sid-2" }; + const system = [{ type: "text", text: "You are Claude Code" }]; + const k1 = resolveInsertionSessionKey(headers, messages, system); + const k2 = resolveInsertionSessionKey(headers, messages, system); + assert.equal(k1, k2); +}); + +test("session key resolution: absent system prompt -> stable bucket, distinct from a present one", () => { + const messages = conv(4, "nosys-key"); + const headers = { "x-claude-code-session-id": "shared-sid-3" }; + const withSystem = resolveInsertionSessionKey(headers, messages, [{ type: "text", text: "sys" }]); + const withoutSystem = resolveInsertionSessionKey(headers, messages, undefined); + assert.notEqual(withSystem, withoutSystem); + assert.ok(withoutSystem.includes("-nosys-")); + // Stable across calls — the absent-system bucket is a bucket, not a nonce. + assert.equal(withoutSystem, resolveInsertionSessionKey(headers, messages, undefined)); +}); + +// Regression guard: the system-prompt sub-key separates sidecar CLASSES, not +// the individual conversations within one class. Every subagent of a session +// runs the same agent system prompt, so keyed on (sid, system) alone they all +// shared one canonical and overwrote each other. Measured on real traffic +// before the conversation sub-key: one system-prompt bucket held 39 distinct +// conversations, and 100% of conversation switches within a bucket reset +// (60/60) versus 1% of same-conversation continuations. +test("session key resolution: same session-id AND same system prompt, different conversations -> different keys", () => { + const headers = { "x-claude-code-session-id": "shared-sid-4" }; + const system = [{ type: "text", text: "You are a Claude agent." }]; + const a = resolveInsertionSessionKey(headers, conv(4, "agent-one"), system); + const b = resolveInsertionSessionKey(headers, conv(4, "agent-two"), system); + assert.notEqual(a, b); + // Same conversation continuing (more messages appended) keeps its key — + // otherwise every turn would look like a new conversation. + const grown = resolveInsertionSessionKey(headers, conv(9, "agent-one"), system); + assert.equal(a, grown); +}); + +// msgs[0] with STRING content must still yield a conversation identity: +// hashMessageContent covers block arrays only and returns null for strings, +// which collapsed every string-content conversation into one shared bucket +// (56 of 602 requests in the measured capture). +test("session key resolution: string-content msgs[0] gets a real conversation key, not a shared 'empty' bucket", () => { + const headers = { "x-claude-code-session-id": "shared-sid-5" }; + const system = [{ type: "text", text: "sys" }]; + const strA = resolveInsertionSessionKey(headers, [{ role: "user", content: "alpha" }], system); + const strB = resolveInsertionSessionKey(headers, [{ role: "user", content: "beta" }], system); + assert.notEqual(strA, strB); + assert.ok(!strA.endsWith("-empty")); + // A genuinely contentless first message is the only "empty". + const none = resolveInsertionSessionKey(headers, [{ role: "user" }], system); + assert.ok(none.endsWith("-empty")); +}); + +// Compaction. Verified against real traffic 2026-07-28 (session 58c979ce): +// across the boundary the session-id and the system-prompt sub-key are +// unchanged while the conversation sub-key flips 0dc13516 -> 554180f8 — +// +// n=780 1548 msgs conv 0dc13516c44f88c7 (summarization call) +// n=786 4 msgs conv 554180f85a9a1528 (continuation) +// +// so a compacted thread is a NEW conversation to every stateful extension: +// fresh canonical, no reset, and `dropped-majority` is NEVER the compaction +// path. That is correct — compaction replaces messages[0], so the prefix +// changed at index 0 and no cached bytes survive by construction. +// +// Pinned here because the alternative was believed before it was checked, +// and because the property is load-bearing in the other direction too: if a +// future keying change made the continuation share the pre-compaction key, +// the 1548-message canonical would be applied to a 4-message history. +test("session key resolution: a compacted continuation is a NEW conversation, not a continuation", () => { + const headers = { "x-claude-code-session-id": "shared-sid-compact" }; + const system = [{ type: "text", text: "You are Claude Code" }]; + + const before = resolveInsertionSessionKey(headers, conv(40, "long-thread"), system); + // What CC actually sends after compacting: a fresh short history whose + // first message is the summary, NOT the original opening message. + const compacted = [ + { role: "user", content: [{ type: "text", text: "This session is being continued... Summary: ..." }] }, + { role: "assistant", content: [{ type: "text", text: "ok" }] }, + ]; + const after = resolveInsertionSessionKey(headers, compacted, system); + + assert.notEqual(before, after, "the compacted thread must not inherit the pre-compaction canonical"); + // Only the conversation sub-key moves: same session, same system prompt. + assert.ok(before.startsWith("s-shared-sid-compact-")); + assert.ok(after.startsWith("s-shared-sid-compact-")); + assert.equal( + before.split("-").slice(0, -1).join("-"), + after.split("-").slice(0, -1).join("-"), + "session-id and system-prompt sub-key are unchanged across a compaction", + ); + // And the post-compaction thread is itself stable as it grows. + assert.equal(after, resolveInsertionSessionKey(headers, [...compacted, { role: "user", content: "next" }], system)); +}); + +test("two interleaved streams under one session-id (main thread + sidecar) keep independent canonicals, neither thrashes the other", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-interleave" }; + const mainSystem = [{ type: "text", text: "You are Claude Code, Anthropic's official CLI for Claude." }]; + const sidecarSystem = [{ type: "text", text: "Generate a concise 5-word title for this conversation." }]; + try { + await silenced(() => + withEnvAsync({ CACHE_FIX_INSERTION_NORMALIZE: "1" }, async () => { + // Main thread request 1: establishes canonical. + const mainMessages1 = conv(6, "main"); + const mainBody1 = { model: "claude-opus-4-7", system: mainSystem, messages: mainMessages1 }; + const mainCtx1 = await runExt(mainBody1, { headers, dir }); + assert.equal(mainCtx1.meta.insertionNormalizeStats.action, "reset"); + assert.equal(mainCtx1.meta.insertionNormalizeStats.resetReason, "no-prior-canonical"); + + // Sidecar request (title-gen), same session-id header, different + // system prompt, entirely unrelated single-turn messages. Before + // the fix this would have been compared against the main thread's + // canonical and thrashed it to reset. + const sidecarMessages = [userMsg("please title this conversation")]; + const sidecarBody = { model: "claude-haiku-4-5", system: sidecarSystem, messages: sidecarMessages }; + const sidecarCtx = await runExt(sidecarBody, { headers, dir }); + assert.equal(sidecarCtx.meta.insertionNormalizeStats.action, "reset"); + assert.equal(sidecarCtx.meta.insertionNormalizeStats.resetReason, "no-prior-canonical", "sidecar's own first-seen, not a thrash of the main thread's canonical"); + + // Main thread request 2: pure append of 2 more messages. Must + // reload MAIN'S OWN canonical (6 entries) from request 1 — not + // reset, and not polluted by the sidecar call in between. + const mainMessages2 = mainMessages1.concat(conv(2, "main-tail")); + const mainBody2 = { model: "claude-opus-4-7", system: mainSystem, messages: mainMessages2 }; + const mainCtx2 = await runExt(mainBody2, { headers, dir }); + assert.equal(mainCtx2.meta.insertionNormalizeStats.action, "append-only", "main thread's canonical survived the interleaved sidecar call"); + assert.equal(mainCtx2.meta.insertionNormalizeStats.inserted, 2); + + // A second sidecar call (another title-gen turn, same system + // prompt) similarly should not disturb, and should build its OWN + // append-only history rather than resetting every time. + const sidecarMessages2 = sidecarMessages.concat([assistantMsg("Title: proxy fixes")]); + const sidecarBody2 = { model: "claude-haiku-4-5", system: sidecarSystem, messages: sidecarMessages2 }; + const sidecarCtx2 = await runExt(sidecarBody2, { headers, dir }); + assert.equal(sidecarCtx2.meta.insertionNormalizeStats.action, "append-only", "sidecar's own canonical persisted across its own turns"); + }), + ); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("old-format (pre-sub-key) state file is ignored gracefully -> treated as no-prior-canonical, not a crash", async () => { + const dir = await newTmp(); + const headers = { "x-claude-code-session-id": "sess-oldformat" }; + const system = [{ type: "text", text: "You are Claude Code" }]; + try { + // Simulate a leftover pre-sub-key state file at the OLD path (no + // system sub-key suffix) — the new code never reads this path, so it + // must be silently abandoned rather than erroring. + const { mkdir: mkdirP, writeFile: writeFileP } = await import("node:fs/promises"); + const snapshotDir = join(dir, "cache-fix-snapshots"); + await mkdirP(snapshotDir, { recursive: true }); + await writeFileP( + join(snapshotDir, "s-sess-oldformat-insertion-canon.json"), + JSON.stringify({ entries: [{ h: "stale-hash", r: "user", o: 0 }] }), + ); + + await silenced(() => + withEnvAsync({ CACHE_FIX_INSERTION_NORMALIZE: "1" }, async () => { + const messages = conv(4, "oldformat"); + const body = { model: "claude-opus-4-7", system, messages }; + const ctx = await runExt(body, { headers, dir }); + // New sub-keyed path has no file yet -> ordinary first-seen reset, + // not a crash and not accidentally matching the stale entries. + assert.equal(ctx.meta.insertionNormalizeStats.action, "reset"); + assert.equal(ctx.meta.insertionNormalizeStats.resetReason, "no-prior-canonical"); + }), + ); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +// ===================================================================== +// Fixture-driven repro: the 2026-07-27 14:05 shape +// ===================================================================== + +test("fixture insertion-1405: normalization yields the arrival-order serialization", async () => { + const fixturePath = join(__dirname, "fixtures", "insertion-1405.json"); + const raw = await readFile(fixturePath, "utf-8"); + const fixture = JSON.parse(raw); + + const priorCanon = computeIdentities(fixture.priorMessages).map((e) => ({ h: e.h, r: e.r, o: e.o })); + const result = classifyInsertion(fixture.incomingMessages, priorCanon); + + assert.equal(result.action, "normalized"); + assert.equal(result.inserted, 2); + // Arrival-order serialization: prior canonical order first... + assert.deepEqual(result.messages.slice(0, fixture.priorMessages.length), fixture.priorMessages); + // ...then the two new entries in their incoming relative order. + assert.deepEqual(result.messages[fixture.priorMessages.length].content[0].text, "queued-message: operator says pause before deploy"); + assert.deepEqual( + result.messages[fixture.priorMessages.length + 1].content[0].text, + "\nThe task tools haven't been used recently.\n", + ); +}); + +// ===================================================================== +// String-content identity (regression, 2026-07-27) +// ===================================================================== +// +// hashMessageContent returns null unless `content` is a block ARRAY, and CC +// sends many messages whose content is a plain string. The fallback identity +// used to be `noContent:${i}` — the array INDEX — so such a message's identity +// WAS its position. The first insertion ahead of one shifted it, the canonical +// lookup missed, and the classifier reset with "not-subsequence": the +// extension broke on exactly the event it exists to absorb. Live measurement +// that day: 83 index-keyed entries in one sub-key, 125 resets over 350 +// requests. + +test("string-content message keeps its identity when an insertion shifts its index", () => { + const sys = (t) => ({ role: "system", content: t }); // string, not blocks + const prior = [ + userMsg("q1"), + { role: "assistant", content: [{ type: "text", text: "a1" }] }, + sys("sys-note"), + userMsg("q2"), + ]; + const priorCanon = computeIdentities(prior).map((e) => ({ h: e.h, r: e.r, o: e.o })); + + // Insert a mid-conversation system message BEFORE the string-content one, + // shifting its index from 2 to 3. + const incoming = [ + prior[0], + sys("MID-TURN NOTE"), + prior[1], + prior[2], + prior[3], + { role: "assistant", content: [{ type: "text", text: "a2" }] }, + ]; + + const result = classifyInsertion(incoming, priorCanon); + assert.notEqual(result.action, "reset", `must not reset: ${result.resetReason ?? ""}`); + assert.equal(result.action, "normalized"); +}); + +test("string-content identity is content-derived, not positional", () => { + const sys = (t) => ({ role: "system", content: t }); + const atTwo = computeIdentities([userMsg("a"), userMsg("b"), sys("same text")]); + const atThree = computeIdentities([userMsg("a"), userMsg("b"), userMsg("c"), sys("same text")]); + assert.equal( + atTwo[2].h, + atThree[3].h, + "identical string content must hash identically regardless of position", + ); + // Different content must still differ. + const other = computeIdentities([sys("different text")]); + assert.notEqual(atTwo[2].h, other[0].h); +}); + +test("a genuinely contentless message still falls back to the index", () => { + const ids = computeIdentities([userMsg("a"), { role: "system" }]); + assert.match(ids[1].h, /^noContent:1$/); +}); + +// ===================================================================== +// Phase 3: volatile-block pinning + removal tolerance (classifyPinned) +// Directive: docs/directives/proxy-volatile-block-pinning.md +// ===================================================================== + +const REMINDER = + "\nPreToolUse:Agent hook additional context: Dispatch starting\n"; + +function userWithReminder(text, reminder = REMINDER) { + return { + role: "user", + content: [ + { type: "text", text }, + { type: "text", text: reminder }, + ], + }; +} + +function pinCanon(messages) { + return classifyPinned(messages, null).canonicalEntries; +} + +test("pin: the attributed flip — reminder vanishing deep in history is absorbed, first-seen bytes forwarded", () => { + // Request N: message 2 carries the hook reminder. Request N+1: same + // message WITHOUT it (the measured 135k/182k shape). + const withBlock = [userMsg("u0"), assistantMsg("a1"), userWithReminder("do it"), assistantMsg("a3")]; + const canon = pinCanon(withBlock); + const flipped = [ + userMsg("u0"), + assistantMsg("a1"), + { role: "user", content: [{ type: "text", text: "do it" }, { type: "text", text: "" }] }, + assistantMsg("a3"), + userMsg("next"), + ]; + const result = classifyPinned(flipped, canon); + assert.equal(result.action, "normalized", "flip absorbed, not reset"); + assert.equal(result.pinned, 1); + assert.deepEqual( + result.messages[2].content, + [{ type: "text", text: "do it" }, { type: "text", text: REMINDER }], + "first-seen bytes forwarded — byte-stable history", + ); +}); + +test("pin: flip back (reminder REAPPEARING) also forwards first-seen — both directions stable", () => { + const without = [userMsg("u0"), assistantMsg("a1"), + { role: "user", content: [{ type: "text", text: "do it" }] }, assistantMsg("a3")]; + const canon = pinCanon(without); + const reappeared = [userMsg("u0"), assistantMsg("a1"), userWithReminder("do it"), assistantMsg("a3")]; + const result = classifyPinned(reappeared, canon); + assert.equal(result.action, "normalized"); + assert.equal(result.pinned, 1); + assert.deepEqual( + result.messages[2].content, + [{ type: "text", text: "do it" }], + "no stored first-seen form (first-seen had no volatile block) -> volatile blocks stripped", + ); +}); + +test("pin: phase-2 baseline still resets on the same flip (the behavior being fixed)", () => { + const withBlock = [userMsg("u0"), assistantMsg("a1"), userWithReminder("do it"), assistantMsg("a3")]; + const canon = computeIdentities(withBlock).map((e) => ({ h: e.h, r: e.r, o: e.o })); + const flipped = [userMsg("u0"), assistantMsg("a1"), + { role: "user", content: [{ type: "text", text: "do it" }] }, assistantMsg("a3")]; + const result = classifyInsertion(flipped, canon); + assert.equal(result.action, "reset"); + assert.equal(result.resetReason, "not-subsequence"); +}); + +test("pin: a NON-volatile content change is NOT absorbed — reset, correctness over savings", () => { + const orig = [userMsg("u0"), assistantMsg("a1"), userMsg("original"), assistantMsg("a3")]; + const canon = pinCanon(orig); + const edited = [userMsg("u0"), assistantMsg("a1"), userMsg("EDITED"), assistantMsg("a3")]; + const result = classifyPinned(edited, canon); + assert.equal(result.action, "reset"); + assert.equal(result.resetReason, "edit-shaped"); +}); + +// The edit test above and this one are a pair: both requests contain one drop +// and one splice, and only CO-LOCATION tells them apart. "Any drop + any +// splice = edit" was the shipped rule and it misfired on real traffic — an +// operator interrupt pruned the tail while a hook reminder migrated 24 indices +// away, which is a prune plus an insertion, not an edit. That false positive +// was the last remaining real reset in the measured corpora. +test("pin: an UNRELATED drop and splice in one request is not an edit — no reset", () => { + const orig = [ + userMsg("u0"), + assistantMsg("a1"), + userMsg("u2"), + assistantMsg("a3"), + userMsg("u4"), + assistantMsg("a5"), + userMsg("tail-to-be-pruned"), + ]; + const canon = pinCanon(orig); + // Splice near the FRONT, prune at the TAIL — far apart, so neither can be a + // replacement for the other. + const next = [ + userMsg("u0"), + assistantMsg("a1"), + userMsg("SPLICED"), + userMsg("u2"), + assistantMsg("a3"), + userMsg("u4"), + assistantMsg("a5"), + ]; + const result = classifyPinned(next, canon); + assert.notEqual(result.action, "reset"); + assert.equal(result.dropped, 1); + assert.equal(result.inserted, 1); + // CC's order is preserved — the splice is not moved to the tail. + assert.deepEqual( + result.messages.map((m) => m.content[0].text), + ["u0", "a1", "SPLICED", "u2", "a3", "u4", "a5"], + ); +}); + +// The other side of the discriminator: a splice landing in the gap left by a +// dropped entry IS an edit and must still reset, even with drop-tolerance on. +test("pin: a splice inside the dropped entry's gap IS an edit — reset", () => { + const orig = [userMsg("u0"), assistantMsg("a1"), userMsg("original"), assistantMsg("a3")]; + const canon = pinCanon(orig); + const edited = [userMsg("u0"), assistantMsg("a1"), userMsg("REPLACEMENT"), assistantMsg("a3")]; + const result = classifyPinned(edited, canon); + assert.equal(result.action, "reset"); + assert.equal(result.resetReason, "edit-shaped"); +}); + +test("pin: prune (context-management removal) — match survives, entries flagged dropped, no reset", () => { + const full = conv(10, "prune"); + const canon = pinCanon(full); + // Remove messages 2 and 3 (an old exchange), keep the rest, grow the tail. + const pruned = [...full.slice(0, 2), ...full.slice(4), userMsg("new tail")]; + const result = classifyPinned(pruned, canon); + assert.notEqual(result.action, "reset", "prune must not reset canonical"); + assert.equal(result.dropped, 2); + const droppedEntries = result.canonicalEntries.filter((e) => e.d); + assert.equal(droppedEntries.length, 2, "dropped entries kept in the file, flagged"); +}); + +test("pin: phase-2 baseline resets on the same prune (the behavior being fixed)", () => { + const full = conv(10, "prune2"); + const canon = computeIdentities(full).map((e) => ({ h: e.h, r: e.r, o: e.o })); + const pruned = [...full.slice(0, 2), ...full.slice(4)]; + const result = classifyInsertion(pruned, canon); + assert.equal(result.action, "reset"); +}); + +test("pin: dropping the majority resets — a compaction is not a prune", () => { + const full = conv(10, "compact"); + const canon = pinCanon(full); + const compacted = [full[0], userMsg("summary of the rest")]; + const result = classifyPinned(compacted, canon); + assert.equal(result.action, "reset"); + assert.equal(result.resetReason, "dropped-majority"); +}); + +// THE positional-canonical regression guard. A mid-history splice must leave +// the canonical in WIRE order, so the next request is a plain append. Filing +// the new entry at the tail of the canonical instead (arrival order) made +// canonical and wire order disagree permanently: request 3 then failed the +// strictly-increasing check with not-subsequence. That was the mechanism +// behind every remaining real reset measured on live captures 2026-07-28. +test("pin: a mid-history splice stays in place — the NEXT request is append-only, not a reset", () => { + const r1 = [userMsg("u0"), assistantMsg("a1"), userMsg("u2"), assistantMsg("a3")]; + let canon = pinCanon(r1); + + // CC splices INJECTED between a1 and u2. + const r2 = [userMsg("u0"), assistantMsg("a1"), userMsg("INJECTED"), userMsg("u2"), assistantMsg("a3")]; + const res2 = classifyPinned(r2, canon); + assert.equal(res2.action, "normalized"); + assert.equal(res2.inserted, 1); + // Forwarded order is CC's order — the spliced entry is NOT moved to the tail. + assert.deepEqual( + res2.messages.map((m) => m.content[0].text), + ["u0", "a1", "INJECTED", "u2", "a3"], + ); + canon = res2.canonicalEntries; + + // CC keeps appending; the spliced entry stays where it was. + const r3 = [...r2, assistantMsg("a4"), userMsg("u5")]; + const res3 = classifyPinned(r3, canon); + assert.equal(res3.action, "append-only", "a settled splice must not re-classify"); + assert.deepEqual( + res3.messages.map((m) => m.content[0].text), + ["u0", "a1", "INJECTED", "u2", "a3", "a4", "u5"], + ); +}); + +test("pin: flip + prune combined in one request — both handled", () => { + const msgs = [userMsg("u0"), assistantMsg("a1"), userWithReminder("deep"), + assistantMsg("a3"), userMsg("u4"), assistantMsg("a5")]; + const canon = pinCanon(msgs); + // Prune u4/a5, flip the reminder off, grow tail. + const next = [userMsg("u0"), assistantMsg("a1"), + { role: "user", content: [{ type: "text", text: "deep" }] }, + assistantMsg("a3"), userMsg("tail")]; + const result = classifyPinned(next, canon); + assert.equal(result.action, "normalized"); + assert.equal(result.pinned, 1); + assert.equal(result.dropped, 2); + assert.deepEqual(result.messages[2].content[1], { type: "text", text: REMINDER }); +}); + +test("pin: a message carrying cache_control is never rewritten", () => { + const marked = { + role: "user", + content: [ + { type: "text", text: "tail msg", cache_control: { type: "ephemeral" } }, + { type: "text", text: REMINDER }, + ], + }; + const msgs = [userMsg("u0"), assistantMsg("a1"), marked]; + const canon = pinCanon(msgs); + const flipped = [userMsg("u0"), assistantMsg("a1"), + { role: "user", content: [{ type: "text", text: "tail msg", cache_control: { type: "ephemeral" } }] }, + userMsg("new")]; + const result = classifyPinned(flipped, canon); + assert.notEqual(result.action, "reset"); + assert.deepEqual( + result.messages[2].content, + [{ type: "text", text: "tail msg", cache_control: { type: "ephemeral" } }], + "marker-carrying message forwarded as-is", + ); +}); + +test("pin: assistant messages keep phase-2 identity — an assistant content change still resets", () => { + const msgs = [userMsg("u0"), assistantMsg("original"), userMsg("u2")]; + const canon = pinCanon(msgs); + const changed = [userMsg("u0"), assistantMsg("CHANGED"), userMsg("u2")]; + const result = classifyPinned(changed, canon); + assert.equal(result.action, "reset"); +}); + +test("pin: tool_result blocks are never volatile even when reminder-shaped", () => { + const tr = { + role: "user", + content: [{ type: "tool_result", tool_use_id: "t1", content: REMINDER }], + }; + assert.equal(isVolatileBlock(tr.content[0]), false); +}); + +test("pin: adjacency invariant enforced across pinned forwarding", () => { + const msgs = [toolUseMsg("t1"), toolResultMsg("t1"), userMsg("u2")]; + const canon = pinCanon(msgs); + const next = [toolUseMsg("t1"), toolResultMsg("t1"), userMsg("u2"), toolUseMsg("t2"), toolResultMsg("t2")]; + const result = classifyPinned(next, canon); + assert.notEqual(result.action, "reset"); + assert.equal(validateToolAdjacency(result.messages), true); +}); + +test("pin: identical request is append-only with zero pins (idempotent)", () => { + const msgs = [userMsg("u0"), assistantMsg("a1"), userWithReminder("stable")]; + const canon = pinCanon(msgs); + const result = classifyPinned(msgs, canon); + assert.equal(result.action, "append-only"); + assert.equal(result.pinned, 0); + assert.equal(result.dropped, 0); +}); + +test("pin: mode marker isolates canon files — a plain-mode file is ignored under pin mode (one honest reset)", async () => { + const dir = await newTmp(); + try { + const body1 = { model: "m", system: [{ type: "text", text: "s" }], messages: conv(4, "mode") }; + // Write canon under phase-2. + await withEnvAsync( + { CACHE_FIX_INSERTION_NORMALIZE: "1", CACHE_FIX_VOLATILE_PIN: undefined }, + () => runExt(body1, { dir, headers: { "x-session-id": "mode-test" } }), + ); + // Same session under pin mode: prior canon must NOT half-match. + const body2 = { model: "m", system: [{ type: "text", text: "s" }], messages: conv(5, "mode") }; + const ctx = await withEnvAsync( + { CACHE_FIX_INSERTION_NORMALIZE: "1", CACHE_FIX_VOLATILE_PIN: "1" }, + () => runExt(body2, { dir, headers: { "x-session-id": "mode-test" } }), + ); + assert.equal(ctx.meta.insertionNormalizeStats.action, "reset"); + assert.equal(ctx.meta.insertionNormalizeStats.resetReason, "no-prior-canonical"); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("pin: end-to-end onRequest — flip absorbed and body mutated under the flag", async () => { + const dir = await newTmp(); + const mk = (msgs) => ({ model: "m", system: [{ type: "text", text: "s" }], messages: msgs }); + try { + await withEnvAsync( + { CACHE_FIX_INSERTION_NORMALIZE: "1", CACHE_FIX_VOLATILE_PIN: "1" }, + () => runExt(mk([userMsg("u0"), assistantMsg("a1"), userWithReminder("deep"), assistantMsg("a3")]), + { dir, headers: { "x-session-id": "e2e-pin" } }), + ); + const flippedBody = mk([userMsg("u0"), assistantMsg("a1"), + { role: "user", content: [{ type: "text", text: "deep" }] }, + assistantMsg("a3"), userMsg("go on")]); + const ctx = await withEnvAsync( + { CACHE_FIX_INSERTION_NORMALIZE: "1", CACHE_FIX_VOLATILE_PIN: "1" }, + () => runExt(flippedBody, { dir, headers: { "x-session-id": "e2e-pin" } }), + ); + assert.equal(ctx.meta.insertionNormalizeStats.action, "normalized"); + assert.equal(ctx.meta.insertionNormalizeStats.pinned, 1); + assert.deepEqual(ctx.body.messages[2].content[1], { type: "text", text: REMINDER }); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("pin: flag off -> classifyPinned never runs, phase-2 byte-identical behavior", async () => { + const dir = await newTmp(); + const mk = (msgs) => ({ model: "m", system: [{ type: "text", text: "s" }], messages: msgs }); + try { + await withEnvAsync( + { CACHE_FIX_INSERTION_NORMALIZE: "1", CACHE_FIX_VOLATILE_PIN: undefined }, + () => runExt(mk([userMsg("u0"), assistantMsg("a1"), userWithReminder("deep")]), + { dir, headers: { "x-session-id": "off-test" } }), + ); + const flippedBody = mk([userMsg("u0"), assistantMsg("a1"), + { role: "user", content: [{ type: "text", text: "deep" }] }]); + const before = JSON.stringify(flippedBody.messages); + const ctx = await withEnvAsync( + { CACHE_FIX_INSERTION_NORMALIZE: "1", CACHE_FIX_VOLATILE_PIN: undefined }, + () => runExt(flippedBody, { dir, headers: { "x-session-id": "off-test" } }), + ); + assert.equal(ctx.meta.insertionNormalizeStats.action, "reset"); + assert.equal(JSON.stringify(ctx.body.messages), before, "no mutation without the flag"); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +// --- Pins survive a reset (threat-matrix row 22) --- +// +// Measured 2026-07-28, capture s-538c0aef: CC honestly replaced message 196, +// so reset(edit-shaped) was right and the cost belonged to 196+. But every +// reset returned without a `messages` field, so the caller forwarded the raw +// array and message 177 lost the first-seen this extension +// had been restoring — our bytes changed at 177 where CC's were identical, +// starting the bust 19 messages early. +// +// The order model is what a reset abandons. The pins are not. +test("classifyPinned: a reset still forwards PINNED bytes for surviving identities", () => { + const volatileBlock = { type: "text", text: "\nhook note\n" }; + const u0 = { role: "user", content: [{ type: "text", text: "turn 0" }, volatileBlock] }; + const a0 = assistantMsg("reply 0"); + const u1 = userMsg("turn 1"); + const a1 = assistantMsg("reply 1"); + + // First request pins u0's first-seen form. + const first = classifyPinned([u0, a0, u1, a1], null); + assert.equal(first.resetReason, "no-prior-canonical"); + const canon = first.canonicalEntries; + + // CC drops the volatile block from u0 AND splices an assistant message + // mid-history — the latter forces a reset that has nothing to do with u0. + const u0NoBlock = userMsg("turn 0"); + const res = classifyPinned([u0NoBlock, a0, assistantMsg("SPLICED"), u1, a1], canon); + + assert.equal(res.action, "reset"); + assert.equal(res.resetReason, "assistant-interleaved"); + assert.ok(res.messages, "a reset must still carry the pinned array"); + assert.deepEqual( + res.messages[0], + u0, + "u0 keeps its first-seen form — the reset is about ORDER, not decoration", + ); + // Safety: substitution only — never a count, role or order change. + assert.equal(res.messages.length, 5); + assert.deepEqual( + res.messages.map((m) => m.role), + ["user", "assistant", "assistant", "user", "assistant"], + ); +}); + +test("BITE — without the carry-over the reset would un-pin the surviving message", () => { + // Same setup, but assert the property that actually costs cache: the bytes + // we forward for an UNCHANGED message must not move because some OTHER + // message was edited. + const volatileBlock = { type: "text", text: "\nnote\n" }; + const u0 = { role: "user", content: [{ type: "text", text: "u0" }, volatileBlock] }; + const a0 = { role: "assistant", content: [{ type: "text", text: "a0" }] }; + const canon = classifyPinned([u0, a0], null).canonicalEntries; + + const stripped = { role: "user", content: [{ type: "text", text: "u0" }] }; + const res = classifyPinned([stripped, { role: "assistant", content: [{ type: "text", text: "EDITED" }] }], canon); + assert.notDeepEqual( + res.messages[0], + stripped, + "forwarding CC's stripped form here is exactly the row-22 defect", + ); +}); diff --git a/test/insertion-suppression-on-reset.test.mjs b/test/insertion-suppression-on-reset.test.mjs new file mode 100644 index 00000000..4467af1f --- /dev/null +++ b/test/insertion-suppression-on-reset.test.mjs @@ -0,0 +1,147 @@ +// insertion-suppression-on-reset — the migrated-duplicate suppression must +// also run when the canonical model RESETS. +// +// The defect this closes, measured live 2026-07-31 (session 77fe2779, request +// 11:41:05.778Z): `classifyPinned` took the +// `resetKeepingPins("not-subsequence")` path — the telemetry names that reason +// verbatim. WHAT made the survivors non-subsequence on that request is NOT +// established here and is deliberately not claimed: `not-subsequence` requires +// matched entries to invert in order, which a plain pruning does not produce +// (that yields `dropped`). The fix does not depend on the trigger — suppression +// must run on the reset path whatever caused the reset — so the tests below +// force the path with an explicit reorder rather than resting on an +// unverified story about the live one. That path restored the pins — the telemetry recorded `pinned: 2` — and +// then returned BEFORE the migrated-duplicate pass, so the same event recorded +// `suppressed: 0`. CC's standalone copy of an already-pinned reminder went out +// on the wire beside the restored inline form, the prefix broke at the host, +// and everything after it re-billed: `edit@98 of 123`, transcript +// `cache_miss_reason messages_changed / cache_missed_input_tokens 105006`, +// ~104 kB. +// +// Why it mattered more than one event: the suppression was built for exactly +// this shape (#76606, decision B) and was silently disabled by ANY reset — +// and this extension's own measurement puts resets at 125 across 350 requests, +// roughly one request in three. It read as shipped and behaved as absent. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { classifyPinned } from "../proxy/extensions/insertion-normalization.mjs"; + +const REMINDER_INNER = "PreToolUse:Agent hook additional context: Dispatch starting"; +const REMINDER = `\n${REMINDER_INNER}\n`; + +const userMsg = (text) => ({ role: "user", content: [{ type: "text", text }] }); +const assistantMsg = (text) => ({ role: "assistant", content: [{ type: "text", text }] }); +const withReminderMsg = (text) => ({ + role: "user", + content: [{ type: "text", text }, { type: "text", text: REMINDER }], +}); +// CC's migrated form: the reminder alone, wrapper stripped, as its own message. +const migratedStandalone = () => ({ role: "system", content: [{ type: "text", text: REMINDER_INNER }] }); + +const pinCanon = (messages) => classifyPinned(messages, null).canonicalEntries; + +// canonical order: host, a1, u2, a2 — incoming puts u2 BEFORE a1, so the +// matched indices invert and classifyPinned resets with "not-subsequence". +const resetPair = () => { + const canon = pinCanon([withReminderMsg("host"), assistantMsg("a1"), userMsg("u2"), assistantMsg("a2")]); + const incoming = [ + { role: "user", content: [{ type: "text", text: "host" }] }, // reminder migrated out + migratedStandalone(), + userMsg("u2"), // <- reordered ahead of a1 + assistantMsg("a1"), + assistantMsg("a2"), + userMsg("tail"), + ]; + return { canon, incoming }; +}; + +test("REGRESSION: a reset still suppresses the migrated duplicate", () => { + const { canon, incoming } = resetPair(); + const r = classifyPinned(incoming, canon); + + assert.equal(r.action, "reset", "precondition: this pair must take the reset path"); + assert.equal(r.resetReason, "not-subsequence", "precondition: the live reason"); + assert.ok(r.pinned >= 1, "precondition: the reset must still restore the pin"); + assert.equal(r.suppressed, 1, "the migrated duplicate must be suppressed ON THE RESET PATH"); + + // Counted is not enough — it must be off the wire. + assert.ok(Array.isArray(r.messages), "a suppressing reset must rewrite the forwarded array"); + const standaloneOnWire = r.messages.filter( + (m) => m.role === "system" && JSON.stringify(m.content ?? "").includes(REMINDER_INNER)); + assert.equal(standaloneOnWire.length, 0, "the standalone copy must not be forwarded"); + + // And the reminder must still reach the model once, via the restored pin — + // suppression may never mean the text is lost. + const carried = JSON.stringify(r.messages).split(REMINDER_INNER).length - 1; + assert.equal(carried, 1, "the reminder must be carried exactly once, by the pinned inline form"); +}); + +test("the canonical after a suppressing reset never stores the suppressed entry", () => { + // The success path states "the canonical describes the wire we JUST + // FORWARDED"; the reset path must hold it too, or the next request diverges + // against a baseline that was never sent. Asserted on CONTENT, not length — + // canonicalEntries legitimately retains dropped entries (marked `.d`), and an + // earlier draft of this test compared lengths and failed against correct + // behaviour. + const { canon, incoming } = resetPair(); + const r = classifyPinned(incoming, canon); + assert.equal(r.action, "reset"); + assert.equal(r.suppressed, 1); + const asStandalone = JSON.stringify(r.canonicalEntries) + .split(`"${REMINDER_INNER}"`).length - 1; + assert.equal(asStandalone, 0, + "the suppressed standalone must not be stored as its own canonical entry"); +}); + +test("a reset with NO migrated duplicate is unchanged (no false suppression)", () => { + // The guard against the opposite failure: a reset that has nothing to + // suppress must behave exactly as before, or this fix becomes a new source + // of dropped messages. + const canon = pinCanon([ + userMsg("m1"), assistantMsg("a1"), + userMsg("ephemeral"), assistantMsg("e2"), + userMsg("u2"), assistantMsg("a2"), + ]); + const incoming = [ + userMsg("m1"), assistantMsg("a1"), + userMsg("u2"), assistantMsg("a2"), userMsg("tail"), + ]; + const r = classifyPinned(incoming, canon); + assert.equal(r.suppressed ?? 0, 0, "nothing to suppress must suppress nothing"); +}); + +test("a standalone matching NOTHING pinned is forwarded untouched on a reset", () => { + const canon = pinCanon([ + withReminderMsg("host"), assistantMsg("a1"), + userMsg("ephemeral"), assistantMsg("e2"), + userMsg("u2"), assistantMsg("a2"), + ]); + const unrelated = { role: "system", content: [{ type: "text", text: "something else entirely" }] }; + const incoming = [ + withReminderMsg("host"), unrelated, + assistantMsg("a1"), userMsg("u2"), assistantMsg("a2"), userMsg("tail"), + ]; + const r = classifyPinned(incoming, canon); + assert.equal(r.suppressed ?? 0, 0, "an unrelated standalone must not be suppressed"); + const wire = JSON.stringify(r.messages ?? incoming); + assert.ok(wire.includes("something else entirely"), "and must still be forwarded"); +}); + +test("the TAIL standalone is never suppressed, even on a reset", () => { + // Tail growth is ordinary appending, not a stray migration — the success + // path guards this positionally and the reset path must guard it the same + // way, or genuine new turns get eaten. + const canon = pinCanon([ + withReminderMsg("host"), assistantMsg("a1"), + userMsg("ephemeral"), assistantMsg("e2"), + userMsg("u2"), assistantMsg("a2"), + ]); + const incoming = [ + withReminderMsg("host"), assistantMsg("a1"), + userMsg("u2"), assistantMsg("a2"), + migratedStandalone(), // LAST index + ]; + const r = classifyPinned(incoming, canon); + assert.equal(r.suppressed ?? 0, 0, "a tail-position duplicate must be left alone"); +}); diff --git a/test/insertion-suppression.test.mjs b/test/insertion-suppression.test.mjs new file mode 100644 index 00000000..3274f779 --- /dev/null +++ b/test/insertion-suppression.test.mjs @@ -0,0 +1,510 @@ +// insertion-suppression — pin-and-suppress (#76606, decision B; BACKLOG.md +// entry "Reminder-swap (#76606): DECIDED — pin-and-suppress", part (c)). +// +// The defect this closes: insertion-normalization's positional rebuild +// restores a pinned message's first-seen bytes (reminder included) AND +// forwards CC's migrated standalone duplicate of that same reminder as a +// new entry — measured directly on capture s-633915a8, pair n=26->28: +// message[30]'s -wrapped block, absent from CC's own +// message[30] on the n=28 side, reappears wrapper-stripped as the entire +// content of CC's new message[31] (role system). The pin restores it +// inline at 30; the extension ALSO forwards the standalone copy at 31 — +// carrying the reminder twice and splicing the array, which moves the +// cache's longest-identical-prefix boundary to right before 31 and +// re-bills everything after it (outcome record: cacheRead 15424 / +// cacheCreation 124025). +// +// The fix: when a NEW entry is standalone (single block after the same +// string->one-block fold canonicalMessageShape already applies) and its +// wrapper-stripped bytes equal a block inside a message this extension is +// currently pinning, suppress it from the forwarded array — the pinned +// inline form already carries those bytes. A standalone message whose +// normalized bytes differ from every pinned block is untouched: existing +// rules (append/splice/edit-shaped reset) apply exactly as before. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { existsSync, readFileSync, readdirSync } from "node:fs"; +import { mkdtemp } from "node:fs/promises"; +import { tmpdir, homedir } from "node:os"; +import { join, dirname } from "node:path"; +import { fileURLToPath, pathToFileURL } from "node:url"; + +import { + classifyPinned, + pinnedBlockHashes, + findSuppressibleDuplicate, +} from "../proxy/extensions/insertion-normalization.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const REPO = join(__dirname, ".."); +const EXT_DIR = join(REPO, "proxy", "extensions"); +const EXT_CONFIG = join(REPO, "proxy", "extensions.json"); + +// --- Helpers (mirrors test/insertion-normalization.test.mjs's idiom) --- + +function userMsg(text) { + return { role: "user", content: [{ type: "text", text }] }; +} +function assistantMsg(text) { + return { role: "assistant", content: [{ type: "text", text }] }; +} + +const REMINDER_INNER = "PreToolUse:Edit hook additional context: file changed"; +const REMINDER = `\n${REMINDER_INNER}\n`; + +function withReminderMsg(text) { + return { + role: "user", + content: [ + { type: "text", text }, + { type: "text", text: REMINDER }, + ], + }; +} + +function pinCanon(messages) { + return classifyPinned(messages, null).canonicalEntries; +} + +// ===================================================================== +// (iii) Unit bites — the identity match itself (wrapper-stripped equality) +// ===================================================================== + +test("pinnedBlockHashes: a live pinned entry's volatile block is present, wrapper stripped", () => { + const canon = pinCanon([withReminderMsg("tool result"), assistantMsg("a1")]); + const hashes = pinnedBlockHashes(canon); + assert.equal(hashes.size, 1); +}); + +test("pinnedBlockHashes: a DROPPED entry's block is excluded — its content is not being served anywhere", () => { + // Build canonical with the reminder-bearing message, then a request that + // prunes it (context-management removal) so it becomes a dropped entry. + const canon1 = pinCanon([withReminderMsg("tool result"), assistantMsg("a1"), userMsg("u2"), assistantMsg("a3")]); + const pruned = classifyPinned( + [assistantMsg("a1"), userMsg("u2"), assistantMsg("a3"), userMsg("tail")], + canon1, + ); + assert.equal(pruned.dropped, 1); + const hashes = pinnedBlockHashes(pruned.canonicalEntries); + assert.equal(hashes.size, 0, "a dropped pin must not be treated as currently live"); +}); + +test("findSuppressibleDuplicate: matches a standalone message whose UNWRAPPED bytes equal a pinned block — the wrapper difference is exactly what wrapper-normalization exists to absorb", () => { + const canon = pinCanon([withReminderMsg("tool result"), assistantMsg("a1")]); + const hashes = pinnedBlockHashes(canon); + const standalone = { role: "system", content: [{ type: "text", text: REMINDER_INNER }] }; + const h = findSuppressibleDuplicate(standalone, hashes); + assert.notEqual(h, null); +}); + +test("findSuppressibleDuplicate: returns null for a non-standalone (multi-block) message even when one block matches — the definition is STANDALONE only", () => { + const canon = pinCanon([withReminderMsg("tool result"), assistantMsg("a1")]); + const hashes = pinnedBlockHashes(canon); + const inline = { + role: "system", + content: [{ type: "text", text: "other" }, { type: "text", text: REMINDER_INNER }], + }; + assert.equal(findSuppressibleDuplicate(inline, hashes), null); +}); + +test("findSuppressibleDuplicate: returns null when the normalized bytes genuinely differ — never a fuzzy match", () => { + const canon = pinCanon([withReminderMsg("tool result"), assistantMsg("a1")]); + const hashes = pinnedBlockHashes(canon); + const standalone = { role: "system", content: [{ type: "text", text: "an unrelated system note" }] }; + assert.equal(findSuppressibleDuplicate(standalone, hashes), null); +}); + +test("findSuppressibleDuplicate: still-wrapped standalone bytes match too (identity is on the UNWRAPPED form on both sides)", () => { + const canon = pinCanon([withReminderMsg("tool result"), assistantMsg("a1")]); + const hashes = pinnedBlockHashes(canon); + const standaloneStillWrapped = { role: "system", content: [{ type: "text", text: REMINDER }] }; + assert.notEqual(findSuppressibleDuplicate(standaloneStillWrapped, hashes), null); +}); + +// ===================================================================== +// (ii) classifyPinned — suppression behavior, and the genuine-change guard +// ===================================================================== + +test("classifyPinned: a standalone duplicate of a pinned block is suppressed; the pinned inline form still forwards", () => { + const orig = [withReminderMsg("tool result"), assistantMsg("a1")]; + const canon = pinCanon(orig); + + // CC's next request: the reminder is gone from the tool_result message + // and reappears, wrapper stripped, as a new standalone message. + const strippedTail = { role: "user", content: [{ type: "text", text: "tool result" }] }; + const standaloneDuplicate = { role: "system", content: [{ type: "text", text: REMINDER_INNER }] }; + const next = [strippedTail, assistantMsg("a1"), standaloneDuplicate, userMsg("continue")]; + + const result = classifyPinned(next, canon); + assert.equal(result.action, "normalized"); + // Pinned inline form restored at position 0 — reminder included. + assert.deepEqual(result.messages[0], orig[0]); + // The standalone duplicate never appears in the forwarded array. + assert.ok( + !result.messages.some((m) => JSON.stringify(m) === JSON.stringify(standaloneDuplicate)), + "the migrated duplicate must not be forwarded a second time", + ); + assert.equal(result.messages.length, next.length - 1, "the array is one shorter — the duplicate, not a substitution"); + assert.equal(result.suppressed, 1); + assert.equal(result.suppressions.length, 1); + assert.equal(result.suppressions[0].index, 2, "the suppressed entry's index in the INCOMING array"); + // "continue" (tail growth after the duplicate) still forwards, at its + // shifted position — suppression removes only the duplicate, nothing else. + assert.deepEqual(result.messages[result.messages.length - 1], userMsg("continue")); +}); + +// ===================================================================== +// TAIL GUARD (BACKLOG.md, "suppression can strip a request's FINAL +// message", 2026-07-30). Three real 400s ("must end with a user +// message"): report-enforcer injects identical instruction bytes at +// every SubagentStop; the first occurrence is pinned, and when the SAME +// bytes arrive again as a resume request's ONLY/new final message, +// suppressing it left the forwarded array ending on the prior assistant +// turn. A tail-position duplicate is CC's live payload for THIS request, +// not a migration copy of already-pinned content, regardless of role or +// which hash set (single-block or join) matched it. +// ===================================================================== + +test("TAIL GUARD: a standalone duplicate at the FINAL index is never suppressed — it is live payload, not a migration", () => { + const orig = [withReminderMsg("tool result"), assistantMsg("a1")]; + const canon = pinCanon(orig); + + const strippedTail = { role: "user", content: [{ type: "text", text: "tool result" }] }; + const standaloneDuplicate = { role: "system", content: [{ type: "text", text: REMINDER_INNER }] }; + // No trailing entry after the duplicate — it IS the array's final + // message, mirroring the real resume-request shape. + const next = [strippedTail, assistantMsg("a1"), standaloneDuplicate]; + + const result = classifyPinned(next, canon); + assert.equal(result.suppressed, 0, "a final-position duplicate must never be suppressed"); + assert.equal(result.suppressions.length, 0); + assert.deepEqual( + result.messages[result.messages.length - 1], + standaloneDuplicate, + "the final message must be forwarded intact — this is exactly what would otherwise strip a resume's last turn", + ); +}); + +test("REGRESSION: the same standalone duplicate, mid-history (not final), is still suppressed", () => { + const orig = [withReminderMsg("tool result"), assistantMsg("a1")]; + const canon = pinCanon(orig); + + const strippedTail = { role: "user", content: [{ type: "text", text: "tool result" }] }; + const standaloneDuplicate = { role: "system", content: [{ type: "text", text: REMINDER_INNER }] }; + // Same duplicate, same position (index 2) as the tail-guard test above, + // but with a trailing turn after it — no longer the final index. + const next = [strippedTail, assistantMsg("a1"), standaloneDuplicate, userMsg("continue")]; + + const result = classifyPinned(next, canon); + assert.equal(result.suppressed, 1, "mid-history duplicates are suppressed exactly as before the tail guard"); + assert.equal(result.suppressions[0].index, 2); +}); + +test("classifyPinned: suppression is stable across a THIRD request — CC keeps resending the duplicate, it keeps getting suppressed, with no persisted marker needed", () => { + const orig = [withReminderMsg("tool result"), assistantMsg("a1")]; + let canon = pinCanon(orig); + + const strippedTail = { role: "user", content: [{ type: "text", text: "tool result" }] }; + const standaloneDuplicate = { role: "system", content: [{ type: "text", text: REMINDER_INNER }] }; + const r2 = [strippedTail, assistantMsg("a1"), standaloneDuplicate, userMsg("continue")]; + const res2 = classifyPinned(r2, canon); + assert.equal(res2.suppressed, 1); + canon = res2.canonicalEntries; + + // CC believes the duplicate is part of history now and keeps sending it, + // plus new tail growth. + const r3 = [strippedTail, assistantMsg("a1"), standaloneDuplicate, userMsg("continue"), assistantMsg("a2")]; + const res3 = classifyPinned(r3, canon); + assert.equal(res3.suppressed, 1, "re-detected and re-suppressed on every later request that still carries it"); + assert.ok(!res3.messages.some((m) => JSON.stringify(m) === JSON.stringify(standaloneDuplicate))); +}); + +// Genuine change: the brief's own scenario for this is the EXISTING +// drop+co-located-splice "edit-shaped" reset (test/insertion-normalization +// .test.mjs already covers the discriminator itself) — the load-bearing +// property here is that a standalone message whose bytes genuinely differ +// from every pinned block does not get silently swallowed by the +// suppression path; the pre-existing reset rule still applies unchanged. +test("classifyPinned: a standalone message that does NOT match any pinned block still resets when the underlying change is edit-shaped — suppression does not mask a genuine edit (fires-on-non-defect guard)", () => { + const orig = [withReminderMsg("tool result"), assistantMsg("a1"), userMsg("original"), assistantMsg("a3")]; + const canon = pinCanon(orig); + // "original" is dropped; "REPLACEMENT" — standalone in SHAPE but + // textually unrelated to the pinned reminder — lands in the gap it left. + // Co-location makes this an edit (not an unrelated splice), and its + // normalized bytes differ from every pinned block. + const edited = [orig[0], assistantMsg("a1"), userMsg("REPLACEMENT"), assistantMsg("a3")]; + const result = classifyPinned(edited, canon); + assert.equal(result.action, "reset"); + assert.equal(result.resetReason, "edit-shaped"); + assert.equal(result.suppressed ?? 0, 0, "a genuine edit must not be swallowed as a suppression"); +}); + +test("classifyPinned: a standalone message with unrelated content is simply forwarded — no suppression, no special-cased reset", () => { + const orig = [withReminderMsg("tool result"), assistantMsg("a1")]; + const canon = pinCanon(orig); + const differentStandalone = { role: "system", content: [{ type: "text", text: "an unrelated system note" }] }; + const next = [orig[0], assistantMsg("a1"), differentStandalone, userMsg("continue")]; + const result = classifyPinned(next, canon); + assert.notEqual(result.action, "reset"); + assert.equal(result.suppressed, 0); + assert.ok(result.messages.some((m) => JSON.stringify(m) === JSON.stringify(differentStandalone))); +}); + +test("classifyPinned: an assistant-role standalone entry is never suppressed, even if it coincidentally matches a pinned block's bytes", () => { + const orig = [withReminderMsg("tool result"), assistantMsg("a1")]; + const canon = pinCanon(orig); + // Constructed only to exercise the exclusion — an assistant message never + // legitimately duplicates a hook reminder this way in practice. + const assistantDuplicate = { role: "assistant", content: [{ type: "text", text: REMINDER_INNER }] }; + const next = [orig[0], assistantMsg("a1"), assistantDuplicate]; + const result = classifyPinned(next, canon); + assert.equal(result.suppressed, 0); + assert.ok(result.messages.some((m) => JSON.stringify(m) === JSON.stringify(assistantDuplicate))); +}); + +// ===================================================================== +// (i) RED-GREEN on the real pair — capture s-633915a8, n=26->28 +// ===================================================================== +// +// Mirrors test/mitigation-output-form.test.mjs's real-capture harness +// exactly (same loadExtensions/runOnRequest machinery, same boot-record +// gate set, same scratch CLAUDE_CONFIG_DIR, replayed from the start of the +// file so insertion-normalization's per-conversation canonical state is +// genuine) — not a re-derivation of it. That file's own real-pair test +// asserts the PRE-fix values (outputForm==="edit@31") and is NOT in this +// change's write boundary; running it after this fix is expected to fail, +// and that is surfaced in the closing report rather than fixed here. +// +// Fixture-fallback (BACKLOG.md "READY — harvest --pin freezes evidence +// ranges as fixtures"): capture rotated away -> fall back to the pinned +// fixture at test/fixtures/harvested/pinned-s-4b6a435234bf-26-28.json (`node +// tools/harvest.mjs --pin n..m`); both absent -> skip. Both paths are +// overridable via env for the fallback's own red-green test +// (test/harvest-pin.test.mjs) — never by editing the real capture, which is +// read-only evidence shared with other work. +const PINNED_FIXTURE = + process.env.CACHE_FIX_TEST_FIXTURE_OVERRIDE ?? + join(__dirname, "fixtures", "harvested", "pinned-s-4b6a435234bf-26-28.json"); + +// The capture is NAMED WITHOUT BEING NAMED (BACKLOG.md g2: "test +// REAL_CAPTURE defaults carry a live session UUID and an absolute /home +// path" — this repo is public, and a capture UUID plus a home path is a live +// identifier). The pinned fixture's header already carries `s-` = +// sidToken(conversation key) for the capture it was frozen from, and every +// capture on disk is named `-requests.jsonl`, so the right file is +// recoverable by hashing the candidates rather than by hardcoding one. The +// per-machine capture directory itself comes from homedir(), never a literal +// path. `sidToken` ships in the tools slice, so it is passed in by the test +// (which loads tools/harvest.mjs dynamically); no tools/ -> no capture +// resolution -> the fixture fallback, then the designed skip. +function resolveRealCapture(fixturePath, sidToken) { + if (process.env.CACHE_FIX_TEST_CAPTURE_OVERRIDE) return process.env.CACHE_FIX_TEST_CAPTURE_OVERRIDE; + if (!sidToken) return null; + let wanted; + try { + wanted = JSON.parse(readFileSync(fixturePath, "utf-8")).header?.key; + } catch { + return null; + } + if (!wanted) return null; + const dir = join(homedir(), ".claude", "cache-fix-captures"); + let names; + try { + names = readdirSync(dir); + } catch { + return null; + } + const SUFFIX = "-requests.jsonl"; + for (const name of names) { + if (!name.endsWith(SUFFIX)) continue; + if (sidToken(name.slice(0, -SUFFIX.length)) === wanted) return join(dir, name); + } + return null; +} +const GATES = { + CACHE_FIX_FORWARD_PROXY: "on", + CACHE_FIX_SESSION_MIRROR: "on", + CACHE_FIX_PREFIXDIFF: "1", + CACHE_FIX_INSERTION_NORMALIZE: "1", + CACHE_FIX_VOLATILE_PIN: "1", + CACHE_FIX_TOOL_REWRITE: "1", + CACHE_FIX_UPSTREAM_DETECTION: "1", + CACHE_FIX_REQUEST_CAPTURE: "1", + CACHE_FIX_CAPTURE_MAX_MB: "8192", + CACHE_FIX_OUTPUT_GUARD: "1", +}; +const TARGET_N = 28; + +const entry = (n, inMsgs, outMsgs, extra = {}) => ({ + n, + ts: `2026-07-28T00:00:${String(n).padStart(2, "0")}Z`, + key: "k", + inMsgs, + outMsgs, + action: null, + resetReason: null, + ...extra, +}); + +test( + "real capture n=26->28: pin-and-suppress turns the input-mitigated/output-spliced pair into a clean append, safety gate 0 violations", + async (t) => { + // Fixture-fallback: capture present -> unchanged live-capture path; + // capture absent -> pinned fixture if present; else skip. Both readers + // yield the same [n, line] tuple shape, so the replay loop below is + // identical either way. The fixture reader ships in the tools slice + // (like replayTools below), so it loads dynamically — a tree without + // tools/ skips instead of failing at module load. + // + // ORDINALS. The fixture is MINIMIZED (directive, "Fixture strategy"): it + // holds capture ordinals replayFrom..m rather than 0..m, since the + // dropped prefix only ever established pin state. Numbering the replayed + // entries from `header.replayFrom` instead of from 0 is what keeps + // "n=26->28" (and the suppressed index 31) the same facts on both paths — + // the assertions below are untouched by the cut. The live capture starts + // at 0 by definition. + let readPinnedFixture; + let sidToken; + try { + ({ readPinnedFixture, sidToken } = await import("../tools/harvest.mjs")); + } catch { + readPinnedFixture = null; + sidToken = null; + } + const REAL_CAPTURE = resolveRealCapture(PINNED_FIXTURE, sidToken); + let source; + let replayFrom = 0; + if (REAL_CAPTURE && existsSync(REAL_CAPTURE)) { + source = null; // resolved below, once readCapture is loaded from tools/replay.mjs + } else if (existsSync(PINNED_FIXTURE) && readPinnedFixture) { + source = readPinnedFixture(PINNED_FIXTURE); + replayFrom = JSON.parse(readFileSync(PINNED_FIXTURE, "utf-8")).header?.replayFrom ?? 0; + } else { + t.skip( + `capture rotated away (no capture on disk hashing to the fixture's key) and no pinned fixture at ${PINNED_FIXTURE} — COULD NOT VERIFY`, + ); + return; + } + + // The census/gate helpers ship in the tools slice; in a tree carrying + // only the extension (upstream PR #272) this check rides #276 instead. + let replayTools; + try { + replayTools = await import("../tools/replay.mjs"); + } catch { + t.skip("tools/replay.mjs not in this tree — the real-pair check runs where the tools land"); + return; + } + const { findMitigationGaps, findSafetyViolations, safetyViolation, readCapture } = replayTools; + if (source === null) source = readCapture(REAL_CAPTURE); + + const scratch = await mkdtemp(join(tmpdir(), "insertion-suppression-")); + const saved = {}; + const overrides = { CLAUDE_CONFIG_DIR: scratch, ...GATES }; + for (const k of Object.keys(overrides)) { + saved[k] = process.env[k]; + process.env[k] = overrides[k]; + } + + const origStderr = process.stderr.write.bind(process.stderr); + process.stderr.write = () => true; + try { + const { loadExtensions, runOnRequest } = await import( + pathToFileURL(join(REPO, "proxy", "pipeline.mjs")).href + ); + const extensions = await loadExtensions(EXT_DIR, EXT_CONFIG); + + const entries = []; + let reqN = replayFrom - 1; + for await (const [, line] of source) { + let rec; + try { + rec = JSON.parse(line); + } catch { + continue; + } + if (rec.type === "outcome" || rec.type === "boot") continue; + const n = ++reqN; + const body = structuredClone(rec.body); + const headers = { + "anthropic-beta": rec.headers?.["anthropic-beta"] ?? undefined, + "x-session-id": rec.headers?.["session-id"] ?? rec.sid ?? undefined, + }; + const ctx = { body, headers, meta: { route: "messages" } }; + await runOnRequest(ctx, extensions); + entries.push( + entry( + n, + Array.isArray(rec.body?.messages) ? rec.body.messages : [], + Array.isArray(ctx.body?.messages) ? ctx.body.messages : [], + { + key: rec.key, + ts: rec.ts, + action: ctx.meta.insertionNormalizeStats?.action ?? null, + resetReason: ctx.meta.insertionNormalizeStats?.resetReason ?? null, + stats: ctx.meta.insertionNormalizeStats ?? null, + }, + ), + ); + if (n === TARGET_N) break; + } + + const rows = findMitigationGaps(entries); + const row = rows.find((r) => r.n === 28 && r.prevN === 26); + assert.ok(row, "expected a mitigation row for pair n=26->28"); + + // Input-side self-report is untouched by this change. + assert.equal(row.mitigated, true); + assert.equal(row.rebilledBytes, 0); + // Output-side: PARTIALLY fixed, and the residual is independently + // explained, not left as an unexplained gap. Before this change: + // outputForm==="edit@31", ~61 kB rebilled (test/mitigation-output-form + // .test.mjs's real-pair test, unmodified, pins that prior state). + // After: the suppressed duplicate closes the divergence through index + // 47 (bytes 31-47 identical to n=26's own output for the first time), + // but a SECOND, unrelated divergence surfaces at 48 — ttl-management + // (order 500, a different extension, not touched by this change) + // relocates the ephemeral cache_control marker to the live tail on + // every growing turn; n=26's tail (its last message) carried the + // marker at 48, n=28's tail has grown past it, so the marker is + // simply gone from that position — a real byte difference this + // change was never going to close, verified by diffing the two + // messages directly (identical apart from the `cache_control` key). + // Residual bytes dropped from ~61 kB to ~5 kB (full-corpus census, + // both runs pasted in the closing report) — this change's actual, + // bounded contribution, not the BACKLOG entry's stated "outputForm + // === append" criterion, which this pair cannot reach while + // ttl-management's marker relocation exists. Surfaced as a gap. + // The only remaining delta is ttl-management's cache_control marker + // relocating off the old tail — since the outputForm metric strips + // cache_control (903a2be: a moved marker is not a content splice), + // the suppressed pair now reads fully preserved. A regression that + // reintroduces CONTENT divergence flips this to a non-append form. + assert.equal(row.outputForm, "append", "suppression + marker-blind metric: nothing but the marker moved"); + assert.equal(row.outputPreserved, true); + assert.equal(row.rebilledOutBytes, 0); + + // The n=28 entry itself: exactly one suppression, at the index the + // fidelity probe named (message[31] in the pre-fix pipeline). + const e28 = entries.find((e) => e.n === 28); + assert.equal(e28.stats?.suppressed, 1); + assert.equal(e28.stats?.suppressions?.[0]?.index, 31); + + // Safety gate: the declared exemption in tools/replay.mjs's + // safetyViolation must not count this suppression as a length + // corruption. Checked directly (not just via the aggregate zero) so + // a false negative elsewhere in findSafetyViolations can't hide a + // problem here. + assert.equal(safetyViolation(e28), null, "the exemption must fire on this exact suppression"); + const safety = findSafetyViolations(entries); + assert.equal(safety.length, 0, "declared exemption applied across the whole replayed prefix"); + } finally { + process.stderr.write = origStderr; + for (const k of Object.keys(saved)) { + if (saved[k] === undefined) delete process.env[k]; + else process.env[k] = saved[k]; + } + } + }, +); diff --git a/test/mitigation-output-form.test.mjs b/test/mitigation-output-form.test.mjs new file mode 100644 index 00000000..40d40e3b --- /dev/null +++ b/test/mitigation-output-form.test.mjs @@ -0,0 +1,281 @@ +// mitigation-output-form — the OUTPUT-side companion to `mitigated`. +// +// `findMitigationGaps`'s `mitigated` field is an INPUT-side fact: it trusts +// insertion-normalization's own self-report that it re-serialised CC's +// splice into an append, and prices the miss from CC's own input divergence +// index. It has no opinion on where the result actually landed once +// forwarded. Measured 2026-07-29 (capture s-633915a8, pair n=26->28): +// `mitigated: true`, `rebilledBytes: 0` — while the forwarded array kept a +// byte-stable prefix through index 30 and then SPLICED a standalone system +// message in at index 31, re-billing everything from there (outcome record: +// cacheRead 15424 / cacheCreation 124025). `mitigated` alone cannot see +// this; `outputForm`/`outputPreserved`/`rebilledOutBytes` can, because they +// compare `outHash`/`outBytes` — what we actually forwarded — instead of +// `inHash`/`inBytes` — what CC sent. +// +// Full evidence trail: the fidelity probe report, `fidelity-probe-report.md`, +// in the authoring session's scratchpad. Its absolute path is not repeated +// here — it carried the live session UUID, and this repo is public (same +// class as the REAL_CAPTURE default below, BACKLOG.md g2). +// +// Since this file was written, two further fixes landed on the SAME pair: +// insertion-normalization's pin-and-suppress (c5d870d) removed the 61 kB +// reminder splice at index 31, leaving a marker-sized residual at index 48 +// (ttl-management relocating its cache_control breakpoint to the new +// tail); then outHashSem (tools/replay.mjs, BACKLOG's "census outputForm +// hashes must strip cache_control") stopped counting a cache_control-only +// relocation as a splice at all. n=26->28 now reads outputForm:"append" — +// the real-pair test below asserts the CURRENT state, not the original +// 2026-07-29 measurement quoted above, which is kept for the mechanism it +// documents. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { existsSync, readFileSync, readdirSync } from "node:fs"; +import { mkdtemp } from "node:fs/promises"; +import { tmpdir, homedir } from "node:os"; +import { join, dirname } from "node:path"; +import { fileURLToPath, pathToFileURL } from "node:url"; + +import { findMitigationGaps, readCapture } from "../tools/replay.mjs"; +import { readPinnedFixture, sidToken } from "../tools/harvest.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const REPO = join(__dirname, ".."); +const EXT_DIR = join(REPO, "proxy", "extensions"); +const EXT_CONFIG = join(REPO, "proxy", "extensions.json"); + +const user = (t) => ({ role: "user", content: [{ type: "text", text: t }] }); +const asst = (t) => ({ role: "assistant", content: [{ type: "text", text: t }] }); +const sys = (t) => ({ role: "system", content: t }); + +// One capture entry as replay.mjs's own main() loop builds it, before +// compactEntry converts it (same shape used by test/replay-gate-selfcheck). +const entry = (n, inMsgs, outMsgs, extra = {}) => ({ + n, + ts: `2026-07-28T00:00:${String(n).padStart(2, "0")}Z`, + key: "k", + inMsgs, + outMsgs, + action: null, + resetReason: null, + ...extra, +}); + +// --- (ii) fires-on-non-defect guard: a GENUINE tail append is not flagged --- +// +// Same input-side shape as the existing "normalized splice counts as +// absorbed" test in replay-gate-selfcheck (input splices SPLICED mid-array, +// action: "normalized"), but here the reconstruction actually does what +// `mitigated: true` claims: the forwarded array keeps prev's output as a +// strict prefix and appends the new content at the TAIL. This must NOT be +// flagged — a checker that fires on a correct append is broken the same way +// as one that misses a real splice. +test("mitigation output-form: a genuine tail-append reconstruction reports append/preserved/0", () => { + const prevIn = [user("u0"), asst("a1"), user("u2")]; + const curIn = [user("u0"), asst("a1"), user("SPLICED"), user("u2")]; + // The extension correctly stabilises the shared prefix AND appends the + // new content at the tail instead of splicing it mid-array. + const prevOut = [user("u0"), asst("a1"), user("u2")]; + const curOut = [user("u0"), asst("a1"), user("u2"), user("SPLICED")]; + + const rows = findMitigationGaps([ + entry(0, prevIn, prevOut, { action: "append-only" }), + entry(1, curIn, curOut, { action: "normalized" }), + ]); + + assert.equal(rows.length, 1); + assert.equal(rows[0].kind, "splice/insert-mid", "input-side classification is unchanged"); + assert.equal(rows[0].mitigated, true); + assert.equal(rows[0].outputForm, "append"); + assert.equal(rows[0].outputPreserved, true); + assert.equal(rows[0].rebilledOutBytes, 0); +}); + +// --- (i) the real defect: capture s-633915a8, pair n=26->28 --- +// +// Replays the ACTUAL extension pipeline over the ACTUAL capture, from the +// start of the file through request 28, under the same gate set the +// fidelity probe used (the boot record's gates, capture file line 1) — the +// same machinery tools/replay.mjs's main() drives (loadExtensions + +// runOnRequest, scratch CLAUDE_CONFIG_DIR), not a re-derivation of it. +// insertion-normalization is stateful (canonical persisted per conversation +// under CLAUDE_CONFIG_DIR), so every request from 0 must be replayed in +// order for n=28's reconstruction to match what actually shipped. +// +// The capture lives outside the repo, in the per-machine capture directory +// that rotates on a quadratic clock (docs/dev-loop.md, "Corpus hygiene") — +// it is not a committed fixture. If it has rotated away, this test falls +// back to a PINNED fixture (BACKLOG.md "READY — harvest --pin freezes +// evidence ranges as fixtures"): `node tools/harvest.mjs --pin n..m` +// freezes the sanitized range as test/fixtures/harvested/pinned--n-m +// .json, committed and therefore immune to capture rotation. Only if BOTH +// the live capture and the pinned fixture are unavailable does the test +// SKIP with a stated reason, rather than reporting a false pass or a false +// fail (docs/dev-loop.md, "A checker has THREE answers"). +// +// Both paths are overridable via env for the fallback's own red-green test +// (test/harvest-pin.test.mjs) — never by editing the real capture, which is +// read-only evidence shared with other work. +const PINNED_FIXTURE = + process.env.CACHE_FIX_TEST_FIXTURE_OVERRIDE ?? + join(__dirname, "fixtures", "harvested", "pinned-s-4b6a435234bf-26-28.json"); + +// The capture is NAMED WITHOUT BEING NAMED (BACKLOG.md g2: "test +// REAL_CAPTURE defaults carry a live session UUID and an absolute /home +// path" — this repo is public, and a capture UUID plus a home path is a live +// identifier). The pinned fixture's header already carries `s-` = +// sidToken(conversation key) for the capture it was frozen from, and every +// capture on disk is named `-requests.jsonl`, so the right file is +// recoverable by hashing the candidates rather than by hardcoding one. The +// per-machine capture directory itself comes from homedir(), never a literal +// path. Nothing on disk that matches -> null -> the fixture fallback, then +// the designed skip. +function resolveRealCapture(fixturePath) { + if (process.env.CACHE_FIX_TEST_CAPTURE_OVERRIDE) return process.env.CACHE_FIX_TEST_CAPTURE_OVERRIDE; + let wanted; + try { + wanted = JSON.parse(readFileSync(fixturePath, "utf-8")).header?.key; + } catch { + return null; + } + if (!wanted) return null; + const dir = join(homedir(), ".claude", "cache-fix-captures"); + let names; + try { + names = readdirSync(dir); + } catch { + return null; + } + const SUFFIX = "-requests.jsonl"; + for (const name of names) { + if (!name.endsWith(SUFFIX)) continue; + if (sidToken(name.slice(0, -SUFFIX.length)) === wanted) return join(dir, name); + } + return null; +} +const REAL_CAPTURE = resolveRealCapture(PINNED_FIXTURE); +const GATES = { + CACHE_FIX_FORWARD_PROXY: "on", + CACHE_FIX_SESSION_MIRROR: "on", + CACHE_FIX_PREFIXDIFF: "1", + CACHE_FIX_INSERTION_NORMALIZE: "1", + CACHE_FIX_VOLATILE_PIN: "1", + CACHE_FIX_TOOL_REWRITE: "1", + CACHE_FIX_UPSTREAM_DETECTION: "1", + CACHE_FIX_REQUEST_CAPTURE: "1", + CACHE_FIX_CAPTURE_MAX_MB: "8192", + CACHE_FIX_OUTPUT_GUARD: "1", +}; +const TARGET_N = 28; + +test( + "mitigation output-form: real capture n=26->28 reports append/preserved once suppression and the cache_control strip both apply", + async (t) => { + // Fixture-fallback: capture present -> unchanged live-capture path; + // capture absent -> pinned fixture if present; else skip. Both readers + // yield the same [n, line] tuple shape, so the replay loop below is + // identical either way. + // + // ORDINALS. The fixture is MINIMIZED (directive, "Fixture strategy"): it + // holds capture ordinals replayFrom..m rather than 0..m, since the + // dropped prefix only ever established pin state. Numbering the replayed + // entries from `header.replayFrom` instead of from 0 is what keeps + // "n=26->28" the same pair on both paths — the assertions below are + // untouched by the cut. The live capture starts at 0 by definition. + let source; + let replayFrom = 0; + if (REAL_CAPTURE && existsSync(REAL_CAPTURE)) { + source = readCapture(REAL_CAPTURE); + } else if (existsSync(PINNED_FIXTURE)) { + source = readPinnedFixture(PINNED_FIXTURE); + replayFrom = JSON.parse(readFileSync(PINNED_FIXTURE, "utf-8")).header?.replayFrom ?? 0; + } else { + t.skip( + `capture rotated away (no capture on disk hashing to the fixture's key) and no pinned fixture at ${PINNED_FIXTURE} — COULD NOT VERIFY`, + ); + return; + } + + const scratch = await mkdtemp(join(tmpdir(), "mitigation-output-form-")); + const saved = {}; + const overrides = { CLAUDE_CONFIG_DIR: scratch, ...GATES }; + for (const k of Object.keys(overrides)) { + saved[k] = process.env[k]; + process.env[k] = overrides[k]; + } + + const origStderr = process.stderr.write.bind(process.stderr); + process.stderr.write = () => true; + try { + const { loadExtensions, runOnRequest } = await import( + pathToFileURL(join(REPO, "proxy", "pipeline.mjs")).href + ); + const extensions = await loadExtensions(EXT_DIR, EXT_CONFIG); + + const entries = []; + let reqN = replayFrom - 1; + for await (const [, line] of source) { + let rec; + try { + rec = JSON.parse(line); + } catch { + continue; + } + if (rec.type === "outcome" || rec.type === "boot") continue; + const n = ++reqN; + const body = structuredClone(rec.body); + const headers = { + "anthropic-beta": rec.headers?.["anthropic-beta"] ?? undefined, + "x-session-id": rec.headers?.["session-id"] ?? rec.sid ?? undefined, + }; + const ctx = { body, headers, meta: { route: "messages" } }; + await runOnRequest(ctx, extensions); + entries.push( + entry( + n, + Array.isArray(rec.body?.messages) ? rec.body.messages : [], + Array.isArray(ctx.body?.messages) ? ctx.body.messages : [], + { + key: rec.key, + ts: rec.ts, + action: ctx.meta.insertionNormalizeStats?.action ?? null, + resetReason: ctx.meta.insertionNormalizeStats?.resetReason ?? null, + }, + ), + ); + if (n === TARGET_N) break; + } + + const rows = findMitigationGaps(entries); + const row = rows.find((r) => r.n === 28 && r.prevN === 26); + + assert.ok(row, "expected a mitigation row for pair n=26->28"); + // Established facts from the fidelity probe (not re-derived here): + // input-side self-report claims full mitigation. + assert.equal(row.mitigated, true, "input-side self-report: normalized, 0 rebilled"); + assert.equal(row.rebilledBytes, 0); + // Output-side reality with BOTH fixes active (c5d870d's suppression, + // then the cache_control strip this test now asserts): suppression + // removed the 61 kB reminder splice, leaving the forwarded arrays + // byte-identical through index 47 and diverging at 48 — n=26's + // message[48] carries ttl-management's cache_control marker (it was + // the tail then), n=28's does not (the conversation grew past it). + // The two messages differ ONLY in that key (direct diff, suppression + // build report (c)4). A relocated cache_control marker is not + // conversation content (outputContentHash's definitional comment, + // tools/replay.mjs) — it is invisible to this content metric BY + // DESIGN, so the pair now reads as a clean tail append with nothing + // re-billed. + assert.equal(row.outputForm, "append", "a relocated cache_control marker is not a splice"); + assert.equal(row.outputPreserved, true); + assert.equal(row.rebilledOutBytes, 0); + } finally { + process.stderr.write = origStderr; + for (const k of Object.keys(saved)) { + if (saved[k] === undefined) delete process.env[k]; + else process.env[k] = saved[k]; + } + } + }, +); diff --git a/test/proxy-fresh-session-sort.test.mjs b/test/proxy-fresh-session-sort.test.mjs index 8597e4ca..e3b7f213 100644 --- a/test/proxy-fresh-session-sort.test.mjs +++ b/test/proxy-fresh-session-sort.test.mjs @@ -227,6 +227,95 @@ test("onRequest: strips cache_control from relocated blocks", async () => { assert.equal(relocated.cache_control, undefined, "cache_control should be stripped from relocated blocks"); }); +// --- onRequest: freshSessionSortStats telemetry (relocate branch only) --- +// +// The extension reports what it did; replay's stability exemption reads +// this instead of re-deriving "was this relocation a first appearance" from +// output shape (dev-loop's "never a re-derived guess" — mirrors +// suppressedIndices in tools/replay.mjs). Two shapes matter: a type +// relocated because it is genuinely new to the array (firstAppearance: +// true) vs. a type that already existed elsewhere in the array and is now +// recurring (firstAppearance: false) — the checker must be able to tell +// them apart, not treat every relocation event alike. + +test("onRequest: relocate branch reports freshSessionSortStats with firstAppearance:true for a genuinely new type", async () => { + const skills = SR + "The following skills are available\n\n- alpha: a\n"; + const ctx = { + body: { + messages: [ + { role: "user", content: [{ type: "text", text: "first prompt" }] }, + { role: "assistant", content: [{ type: "text", text: "reply" }] }, + { + role: "user", + content: [ + { type: "text", text: skills }, + { type: "text", text: "second prompt" }, + ], + }, + ], + }, + headers: {}, + meta: {}, + }; + + await ext.onRequest(ctx); + + assert.ok(ctx.meta.freshSessionSortStats, "relocate branch must report telemetry"); + assert.equal(ctx.meta.freshSessionSortStats.targetIndex, 0, "targetIndex is the message index content was prepended to"); + assert.deepEqual(ctx.meta.freshSessionSortStats.relocated, [{ type: "skills", firstAppearance: true }]); +}); + +test("onRequest: freshSessionSortStats reports firstAppearance:false when the type already appeared earlier in the array", async () => { + const skillsA = SR + "The following skills are available\n\n- alpha: a\n"; + const skillsB = SR + "The following skills are available\n\n- beta: b\n"; + const deferred = SR + "The following deferred tools are now available:\ntool1\n"; + const ctx = { + body: { + messages: [ + // skills already present at messages[0] — this type is NOT new. + { role: "user", content: [{ type: "text", text: skillsA }, { type: "text", text: "first prompt" }] }, + { role: "assistant", content: [{ type: "text", text: "reply" }] }, + { + // A scattered block elsewhere is required to enter the relocate + // branch at all (hasScatteredBlocks); "deferred" is genuinely new + // here, "skills" recurs. + role: "user", + content: [ + { type: "text", text: skillsB }, + { type: "text", text: deferred }, + { type: "text", text: "second prompt" }, + ], + }, + ], + }, + headers: {}, + meta: {}, + }; + + await ext.onRequest(ctx); + + const byType = Object.fromEntries(ctx.meta.freshSessionSortStats.relocated.map((r) => [r.type, r.firstAppearance])); + assert.equal(byType.deferred, true, "deferred appears exactly once in the array — first appearance"); + assert.equal(byType.skills, false, "skills appeared twice (messages[0] and scattered) — not a first appearance"); +}); + +test("onRequest: no freshSessionSortStats when the in-place branch runs (nothing scattered)", async () => { + const skillsText = SR + "The following skills are available\n\n- zephyr: z\n- alpha: a\n"; + const ctx = { + body: { + messages: [ + { role: "user", content: [{ type: "text", text: skillsText }, { type: "text", text: "prompt" }] }, + ], + }, + headers: {}, + meta: {}, + }; + + await ext.onRequest(ctx); + + assert.equal(ctx.meta.freshSessionSortStats, undefined, "in-place branch must not emit relocate telemetry"); +}); + test("onRequest: no-op when no user messages", async () => { const ctx = { body: { messages: [{ role: "assistant", content: [{ type: "text", text: "hi" }] }] }, diff --git a/test/read-lines.test.mjs b/test/read-lines.test.mjs new file mode 100644 index 00000000..74c185a6 --- /dev/null +++ b/test/read-lines.test.mjs @@ -0,0 +1,109 @@ +// read-lines — the pull-based JSONL reader all capture-walking tools share. +// +// The load-bearing test here is backpressure. The readline shape this module +// replaced passed every functional test while buffering the entire remaining +// file the moment its consumer awaited (2.3 GB queued by line 75 on a live +// 1.5 GB capture, 2026-07-29). The functional tests below could never catch +// that; only watching the file position can. During development the +// backpressure test was run against the readline shape and failed with +// bytesRead === file size after ONE consumed line — that red run is what +// makes it a bite test rather than a hope. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { writeFile, mkdtemp, rm } from "node:fs/promises"; +import { createReadStream } from "node:fs"; +import { tmpdir } from "node:os"; +import { join } from "node:path"; + +import { readLines, READ_CHUNK_SIZE } from "../tools/read-lines.mjs"; + +const sleep = (ms) => new Promise((r) => setTimeout(r, ms)); + +async function withTempFile(content, fn) { + const dir = await mkdtemp(join(tmpdir(), "read-lines-")); + const path = join(dir, "f.jsonl"); + await writeFile(path, content); + try { + return await fn(path); + } finally { + await rm(dir, { recursive: true, force: true }); + } +} + +async function collect(iter) { + const out = []; + for await (const line of iter) out.push(line); + return out; +} + +test("splits lines; final unterminated line included; trailing newline adds none", async () => { + await withTempFile("a\nb\nc", async (p) => { + assert.deepEqual(await collect(readLines(p)), ["a", "b", "c"]); + }); + await withTempFile("a\nb\n", async (p) => { + assert.deepEqual(await collect(readLines(p)), ["a", "b"]); + }); +}); + +test("CRLF behaves like readline crlfDelay:Infinity; blank lines survive as empty strings", async () => { + await withTempFile("a\r\nb\r\n\r\nc", async (p) => { + assert.deepEqual(await collect(readLines(p)), ["a", "b", "", "c"]); + }); +}); + +test("UTF-8 sequence split across chunk boundaries stays intact", async () => { + // A line of umlauts long enough that a 2-byte sequence is guaranteed to + // straddle at least one chunk boundary at any chunk size. + const line = "ü".repeat(READ_CHUNK_SIZE); + await withTempFile(`${line}\nend`, async (p) => { + const got = await collect(readLines(p)); + assert.equal(got[0], line); + assert.equal(got[1], "end"); + }); +}); + +test("a line larger than the chunk size is delivered whole", async () => { + const big = "x".repeat(READ_CHUNK_SIZE * 2 + 17); + await withTempFile(`${big}\nsmall`, async (p) => { + const got = await collect(readLines(p)); + assert.equal(got[0].length, big.length); + assert.equal(got[1], "small"); + }); +}); + +// --- BITE: backpressure --- +// +// The mechanism, not a memory statistic: while the consumer sits in awaits +// between lines, the underlying stream's file position must stand still. +// bytesRead may exceed the consumed bytes only by the read-ahead bound +// (buffered chunks), never run to EOF. Run against the readline shape this +// asserts 20 MB read after one line and fails; against the pull-based reader +// it stays within the bound. +test("BITE — an awaiting consumer must not let the reader run ahead of the bound", async () => { + const line = "y".repeat(64 * 1024); + const lines = 300; // ~19 MB + const content = Array(lines).fill(line).join("\n") + "\n"; + await withTempFile(content, async (p) => { + const chunk = 256 * 1024; + const stream = createReadStream(p, { encoding: "utf8", highWaterMark: chunk }); + // Generous bound: consumed bytes + internal read-ahead (a few chunks). + // The defect this guards against overshoots by the WHOLE remaining file, + // so the margin between bound and defect is ~18 MB — not a close call. + const slack = 8 * chunk; + let consumed = 0; + let n = 0; + for await (const l of readLines(stream)) { + n++; + consumed += Buffer.byteLength(l) + 1; + await sleep(1); // park the consumer; a push-based reader runs to EOF here + assert.ok( + stream.bytesRead <= consumed + slack, + `reader ran ahead: consumed=${consumed} bytesRead=${stream.bytesRead} after line ${n}`, + ); + if (n >= 20) break; + } + assert.equal(n, 20); + assert.ok(stream.bytesRead < content.length / 2, "reader must not have slurped the file"); + }); +}); diff --git a/test/replay-class-matrix.test.mjs b/test/replay-class-matrix.test.mjs new file mode 100644 index 00000000..57f19a9a --- /dev/null +++ b/test/replay-class-matrix.test.mjs @@ -0,0 +1,193 @@ +// The divergence-class matrix: every measured mid-history divergence +// class, replayed through the REAL pipeline (loadExtensions + runOnRequest, +// same as tools/replay.mjs) under phase-2 (pin OFF) and phase-3 (pin ON), +// asserting the directive's per-class contract end-to-end — not just the +// classifier in isolation, which is what the unit tests above it cover. +// The last shipped defect class (insertion-normalization index identity) +// lived in exactly this gap: classifier green, pipeline behavior wrong. +// +// Corpora: test/fixtures/replay-classes/corpus-.jsonl — synthetic +// reconstructions of the classes measured live 2026-07-26..28 (flip = +// the two attributed busts; prune = the 91 measured shrinks; splice = +// phase 2's original class; edit/compaction = must-never-normalize; +// toolpair = adjacency across a flip; sidecar = shared session-id, +// distinct system prompt; flipback = reminder reappearing). +// +// Contract per class, pin ON: +// flip/flipback/toolpair -> absorbed (normalized, pinned=1) +// prune -> tolerated (not reset, dropped>0) +// splice -> normalized (phase-2 behavior preserved) +// edit -> reset (edit-shaped), output byte-identical +// to pin OFF (passthrough, no mutation) +// compaction -> reset (dropped-majority), byte-identical +// sidecar -> sub-keys isolated (no cross-thrash) +// And for every class: pin OFF output bytes == the phase-2 baseline +// (flag off changes nothing it didn't already change). + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { mkdtemp, readFile, rm } from "node:fs/promises"; +import { tmpdir } from "node:os"; +import { dirname, join } from "node:path"; +import { fileURLToPath } from "node:url"; +import { createHash } from "node:crypto"; + +import { loadExtensions, runOnRequest } from "../proxy/pipeline.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const FIXTURES = join(__dirname, "fixtures", "replay-classes"); +const EXT_DIR = join(__dirname, "..", "proxy", "extensions"); +const EXT_CONFIG = join(__dirname, "..", "proxy", "extensions.json"); + +function sha(v) { + return createHash("sha256").update(JSON.stringify(v)).digest("hex").slice(0, 12); +} + +async function silenced(fn) { + const orig = process.stderr.write.bind(process.stderr); + process.stderr.write = () => true; + try { + return await fn(); + } finally { + process.stderr.write = orig; + } +} + +// Replay a fixture corpus under the given env flags against a scratch +// state dir. Returns [{ insertion, outHash }] per request. +async function replayCorpus(name, envFlags) { + const corpusPath = join(FIXTURES, `corpus-${name}.jsonl`); + const lines = (await readFile(corpusPath, "utf-8")).split("\n").filter((l) => l.trim()); + + const scratch = await mkdtemp(join(tmpdir(), "class-matrix-")); + const saved = {}; + const overrides = { CLAUDE_CONFIG_DIR: scratch, ...envFlags }; + for (const k of Object.keys(overrides)) { + saved[k] = process.env[k]; + if (overrides[k] === undefined) delete process.env[k]; + else process.env[k] = overrides[k]; + } + try { + return await silenced(async () => { + const extensions = await loadExtensions(EXT_DIR, EXT_CONFIG); + const out = []; + for (const line of lines) { + const rec = JSON.parse(line); + const ctx = { + body: structuredClone(rec.body), + headers: { + "anthropic-beta": rec.headers?.["anthropic-beta"], + // Under a key resolveSessionId actually reads (it ignores + // bare "session-id") — same reconstruction as tools/replay.mjs. + "x-session-id": rec.headers?.["session-id"] ?? rec.sid, + }, + meta: { route: "messages" }, + }; + await runOnRequest(ctx, extensions); + out.push({ insertion: ctx.meta.insertionNormalizeStats ?? null, outHash: sha(ctx.body) }); + } + return out; + }); + } finally { + for (const k of Object.keys(saved)) { + if (saved[k] === undefined) delete process.env[k]; + else process.env[k] = saved[k]; + } + await rm(scratch, { recursive: true, force: true }); + } +} + +const OFF = { CACHE_FIX_INSERTION_NORMALIZE: "1", CACHE_FIX_VOLATILE_PIN: undefined }; +const ON = { CACHE_FIX_INSERTION_NORMALIZE: "1", CACHE_FIX_VOLATILE_PIN: "1" }; + +test("class matrix: flip — absorbed under pin, reset under phase 2", async () => { + const off = await replayCorpus("flip", OFF); + const on = await replayCorpus("flip", ON); + const last = off.length - 1; + assert.equal(off[last].insertion.action, "reset"); + assert.equal(off[last].insertion.resetReason, "not-subsequence"); + assert.equal(on[last].insertion.action, "normalized"); + assert.equal(on[last].insertion.pinned, 1); +}); + +test("class matrix: flipback — reappearing reminder absorbed under pin", async () => { + const on = await replayCorpus("flipback", ON); + assert.equal(on[1].insertion.action, "normalized"); + assert.equal(on[1].insertion.pinned, 1); +}); + +test("class matrix: toolpair — flip absorbed with tool_use/tool_result adjacency intact", async () => { + const on = await replayCorpus("toolpair", ON); + assert.equal(on[1].insertion.action, "normalized"); + assert.equal(on[1].insertion.pinned, 1); +}); + +test("class matrix: prune — tolerated under pin (dropped, not reset); reset under phase 2", async () => { + const off = await replayCorpus("prune", OFF); + const on = await replayCorpus("prune", ON); + assert.equal(off[1].insertion.action, "reset"); + assert.notEqual(on[1].insertion.action, "reset"); + assert.equal(on[1].insertion.dropped, 2); +}); + +// Splice handling DIVERGES between modes by design as of 2026-07-28, and the +// divergence is the point: phase 2 moves a mid-history insertion to the tail +// so the prefix before it stays byte-identical, which saves the cache on THAT +// request and then costs a reset on every request after it — CC keeps sending +// the entry in its original position, so canonical order (entry at the tail) +// and wire order (entry mid-history) disagree forever. Demonstrated on a +// three-request sequence: +// +// phase 2 req2 normalized (u0,a1,u2,a3,INJECTED) req3 RESET/not-subsequence +// pin req2 normalized (u0,a1,INJECTED,u2,a3) req3 append-only +// +// So the "optimization" is a one-shot that pays for itself once and then +// bleeds. The pin keeps CC's order and stays stable. On real traffic this +// removed every not-subsequence reset in both capture corpora (3 -> 0) while +// genuine mid-history splices are rare — 2 of 545 same-conversation pairs. +test("class matrix: splice — pin keeps CC's order; phase 2 moves the entry to the tail", async () => { + const off = await replayCorpus("splice", OFF); + const on = await replayCorpus("splice", ON); + assert.equal(off[1].insertion.action, "normalized"); + assert.equal(on[1].insertion.action, "normalized"); + assert.notEqual(off[1].outHash, on[1].outHash, "modes serialize a splice differently"); +}); + +// The property that matters, and the reason the divergence above is accepted: +// under the pin a spliced entry stays put, so the NEXT request is a plain +// append rather than a reset. This is the regression guard for the canonical +// rebuild being positional rather than arrival-ordered. +test("class matrix: splice — the request AFTER a splice is append-only under pin", async () => { + const on = await replayCorpus("splice", ON); + // Corpus is two requests; the second must not have reset, and its canonical + // must carry the spliced entry in wire position (proved by the absence of a + // reset when the sequence continues — see insertion-normalization tests for + // the three-request form). + assert.notEqual(on[1].insertion.action, "reset"); + assert.equal(on[1].insertion.inserted, 1); +}); + +test("class matrix: edit — reset in both modes, byte-identical passthrough (never normalized)", async () => { + const off = await replayCorpus("edit", OFF); + const on = await replayCorpus("edit", ON); + assert.equal(off[1].insertion.action, "reset"); + assert.equal(on[1].insertion.action, "reset"); + assert.equal(on[1].insertion.resetReason, "edit-shaped"); + assert.equal(off[1].outHash, on[1].outHash, "an edit must pass through unmodified in both modes"); +}); + +test("class matrix: compaction — reset in both modes, byte-identical passthrough", async () => { + const off = await replayCorpus("compaction", OFF); + const on = await replayCorpus("compaction", ON); + assert.equal(off[1].insertion.action, "reset"); + assert.equal(on[1].insertion.action, "reset"); + assert.equal(on[1].insertion.resetReason, "dropped-majority"); + assert.equal(off[1].outHash, on[1].outHash); +}); + +test("class matrix: sidecar — distinct system prompts keep isolated canonicals under pin", async () => { + const on = await replayCorpus("sidecar", ON); + // Request 2 (main thread continuing) must be append-only: the sidecar + // in between must not have thrashed the main thread's canonical. + assert.equal(on[2].insertion.action, "append-only"); +}); diff --git a/test/replay-edit-anchor.test.mjs b/test/replay-edit-anchor.test.mjs new file mode 100644 index 00000000..c7c7837c --- /dev/null +++ b/test/replay-edit-anchor.test.mjs @@ -0,0 +1,129 @@ +// Edit positions carry their STRUCTURAL context — where the edit sits +// relative to the last human-typed message. +// +// Why this is load-bearing and not decoration: row 4 sat "re-opened" with 15 +// unexplained mid-history edits while the census could say WHAT changed and +// WHERE, but not WHY — the WHY required relating the position to conversation +// structure, and that relation lived in a throwaway matcher script until it +// produced the verdict (2026-07-29: 20 of 22 human-anchored mid-history edits +// within ±2 of the anchor — the CC#78660 reminder-anchoring mechanism). The +// throwaway probe is the tell that a check is missing; this is the check. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { isHumanTurn, findEditPositions } from "../tools/replay.mjs"; + +const text = (t) => ({ type: "text", text: t }); +const human = (t = "typed by a person") => ({ role: "user", content: [text(t)] }); +const reminderMsg = (t = "injected") => ({ + role: "user", + content: [text(t)], +}); +const toolResultMsg = () => ({ + role: "user", + content: [{ type: "tool_result", tool_use_id: "t1", content: "r" }], +}); +const asst = (t = "answer") => ({ role: "assistant", content: [text(t)] }); + +test("isHumanTurn: typed text yes; injections, tool_results, assistants no", () => { + assert.equal(isHumanTurn(human()), true); + assert.equal(isHumanTurn({ role: "user", content: "plain string" }), true); + assert.equal(isHumanTurn({ role: "user", content: "x" }), false); + assert.equal(isHumanTurn(reminderMsg()), false); + assert.equal(isHumanTurn(toolResultMsg()), false); + assert.equal(isHumanTurn(asst()), false); + // tool_result carrying an injected reminder block is still not a human turn + assert.equal( + isHumanTurn({ + role: "user", + content: [{ type: "tool_result", tool_use_id: "t1", content: "r" }, text("note")], + }), + false, + ); +}); + +test("BITE — a mid-history edit is annotated with its distance from the human anchor", () => { + // History: [human, asst, human, asst, reminder-carrier, asst] — last human + // turn at index 2. The reminder-carrier at index 4 gets re-stamped between + // requests: anchorDelta must read +2 (the injected-block zone). + const base = [human("q1"), asst("a1"), human("q2"), asst("a2"), reminderMsg("v1"), asst("a3")]; + const edited = base.slice(); + edited[4] = reminderMsg("v2 — re-stamped"); + const entry = (msgs, n) => ({ n, ts: "t", key: "k", inMsgs: msgs, outMsgs: msgs, inTools: [], outTools: [] }); + const rows = findEditPositions([entry(base, 0), entry(edited, 1)]); + assert.equal(rows.length, 1); + assert.equal(rows[0].at, 4); + assert.equal(rows[0].lastHumanAt, 2); + assert.equal(rows[0].anchorDelta, 2, "edit position relative to the anchor is the causal signal"); +}); + +test("a conversation with no human turn reports anchorDelta null, never a guess", () => { + // Subagent shape: briefing arrives as an injected block, so no human turn + // exists under the filter — 11 of 33 mid-history edits in the verifying + // corpus were this shape, and they must be reported as unanchored rather + // than matched against an invented index. + const base = [reminderMsg("do the thing"), asst("a1"), reminderMsg(), asst("a2")]; + const edited = base.slice(); + edited[2] = reminderMsg("changed"); + const entry = (msgs, n) => ({ n, ts: "t", key: "k", inMsgs: msgs, outMsgs: msgs, inTools: [], outTools: [] }); + const rows = findEditPositions([entry(base, 0), entry(edited, 1)]); + assert.equal(rows.length, 1); + assert.equal(rows[0].lastHumanAt, null); + assert.equal(rows[0].anchorDelta, null); +}); + +test("excerptMessage: local evidence line — text flattened, blocks named, capped", async () => { + const { excerptMessage } = await import("../tools/replay.mjs"); + assert.equal( + excerptMessage({ role: "user", content: [text("\nnote\n")] }), + "user: note ", + ); + assert.equal( + excerptMessage({ role: "user", content: [{ type: "tool_result", tool_use_id: "t", content: "r" }] }), + "user: [tool_result]", + ); + const long = excerptMessage({ role: "user", content: "x".repeat(500) }); + assert.ok(long.length < 200 && long.endsWith("…")); + assert.equal(excerptMessage(null), "(missing)"); +}); + +// --- Succession classification: the cross-conversation blind spot, closed --- +import { findSuccessions } from "../tools/replay.mjs"; + +test("successions: compaction, resume and fork shapes classified; pricing carried", () => { + const m = (t) => ({ role: "user", content: [text(t)] }); + const conv = (msgs, n) => ({ n, ts: "t", key: "k", inMsgs: msgs, outMsgs: msgs, inTools: [], outTools: [] }); + const a = [m("A0"), asst("a"), m("A2"), asst("b"), m("A4"), asst("c"), m("A6"), asst("d")]; + // resume-shaped: new head, deep opener, most bodies shared with predecessor + const resumed = [m("A0-changed-head"), ...a.slice(1)]; + const rows = findSuccessions([conv(a, 0), conv(resumed, 1)]); + assert.equal(rows.length, 1); + assert.equal(rows[0].kind, "resume-shaped"); + assert.ok(rows[0].shared >= 6); + assert.ok(rows[0].rebilledBytes > 0, "a succession re-bills its whole opener"); + // compaction: tiny opener + const compacted = [m("summary"), asst("ack")]; + assert.equal(findSuccessions([conv(a, 0), conv(compacted, 1)])[0].kind, "compaction/new-thread"); + // fork/other: deep opener, low overlap + const fork = [m("F0"), m("F1"), asst("x"), m("F3"), asst("y"), m("F5"), asst("z")]; + assert.equal(findSuccessions([conv(a, 0), conv(fork, 1)])[0].kind, "fork/other"); +}); + +test("BITE — sidecar interleaving is NOT a succession: a returning conversation reports nothing", () => { + // Hundreds of sidecar switches per busy capture are the co-tenant normal; + // classifying them as boundaries would fire on every switch and train the + // reader to ignore the class — the check-fires-on-non-defect failure. + const m = (t) => ({ role: "user", content: [text(t)] }); + const conv = (msgs, n) => ({ n, ts: "t", key: "k", inMsgs: msgs, outMsgs: msgs, inTools: [], outTools: [] }); + const mainA = [m("MAIN"), asst("a")]; + const side = [m("SIDECAR"), asst("s")]; + const mainB = [m("MAIN"), asst("a"), m("more"), asst("b")]; + const rows = findSuccessions([conv(mainA, 0), conv(side, 1), conv(mainB, 2)]); + // main -> side is not a succession (main returns at n=2), and side -> main + // is not one either: the sidecar ends but main CONTINUES — it opened at + // n=0, so nothing new starts at n=2. First drafts of this test asserted + // that handback as a succession; requiring the successor's FIRST + // appearance is what keeps one-shot sidecars from minting phantoms. + assert.equal(rows.length, 0); +}); diff --git a/test/replay-fidelity.test.mjs b/test/replay-fidelity.test.mjs new file mode 100644 index 00000000..50d6ef49 --- /dev/null +++ b/test/replay-fidelity.test.mjs @@ -0,0 +1,64 @@ +// classifyFidelity — the population boundaries of the replay-models-proxy +// check. Each population exists because collapsing it into a neighbour hid +// something real: +// - "0/0 comparable" printed exactly like "checked and clean" (the --cold +// lesson) — hence counts, never a bare ratio; +// - outcome records written before outSha existed sat inside noOutcome, +// which reads as "will fill in over time" when that population can only +// ever grow stale; +// - on busy sessions EVERY request is mutated, so the failing check's +// population is empty forever and the informational mutated pair is the +// only signal recorded. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { classifyFidelity } from "../tools/replay.mjs"; + +const entry = (n, over = {}) => ({ n, captureId: `id-${n}`, outBodySha: `body-${n}`, mutatedBy: [], ...over }); + +test("unmutated + outSha: matched or a gate-failing mismatch", () => { + const outcomes = new Map([ + ["id-0", { outSha: "body-0" }], + ["id-1", { outSha: "DIFFERENT" }], + ]); + const f = classifyFidelity([entry(0), entry(1)], outcomes); + assert.equal(f.comparable, 2); + assert.equal(f.matched, 1); + assert.deepEqual(f.mismatches, [{ n: 1, recorded: "DIFFERENT", replayed: "body-1" }]); +}); + +test("mutated requests are informational: counted both ways, never a mismatch", () => { + const outcomes = new Map([ + ["id-0", { outSha: "body-0" }], + ["id-1", { outSha: "DIFFERENT" }], + ]); + const f = classifyFidelity( + [entry(0, { mutatedBy: ["x"] }), entry(1, { mutatedBy: ["x"] })], + outcomes, + ); + assert.equal(f.comparable, 0); + assert.equal(f.mutatedComparable, 2); + assert.equal(f.mutatedMatched, 1); + assert.equal(f.notComparableMutated, 2, "legacy name gate-live reads must keep counting"); + assert.equal(f.mismatches.length, 0, "a mutated divergence is legitimate — never a mismatch"); +}); + +test("BITE — an outcome without outSha is its own population, not noOutcome", () => { + // The pre-outSha recorder produced 14 of these in one capture. Inside + // noOutcome they read as "records missing, will fill in"; they never will. + const outcomes = new Map([["id-0", { /* old writer: no outSha */ }]]); + const f = classifyFidelity([entry(0)], outcomes); + assert.equal(f.outcomeWithoutSha, 1); + assert.equal(f.noOutcome, 0, "must not be lumped into noOutcome"); + assert.equal(f.comparable, 0); +}); + +test("no outcome record at all, and unparseable entries, stay out of every ratio", () => { + const f = classifyFidelity( + [entry(0), { n: 1, error: "unparseable capture line" }], + new Map(), + ); + assert.equal(f.noOutcome, 1); + assert.equal(f.comparable + f.mutatedComparable + f.outcomeWithoutSha, 0); +}); diff --git a/test/replay-gate-selfcheck.test.mjs b/test/replay-gate-selfcheck.test.mjs new file mode 100644 index 00000000..222a7e0d --- /dev/null +++ b/test/replay-gate-selfcheck.test.mjs @@ -0,0 +1,1178 @@ +// replay gate self-check — mutation tests for the CHECKER, not the proxy. +// +// Why this file exists. During the 2026-07-28 session the cross-request +// stability gate shipped with TWO defects, both producing FALSE GREEN: +// +// 1. it compared only ADJACENT capture lines, so under interleaved +// multi-tenant traffic (main thread + subagents + sidecars sharing one +// session-id) most same-conversation pairs were never compared at all. +// A full 602-request capture reported 0 violations while a 40-request +// single-conversation slice of the SAME session reported 2. +// 2. attribution re-ran only the offending pair, which puts stateful +// extensions in a different state than the run that produced the +// violation — so it returned UNATTRIBUTED on precisely the extensions +// most worth attributing. +// +// Both were found by accident. A gate that is confidently wrong is worse +// than no gate: it converts "unverified" into "verified" without anyone +// noticing. The repo already had an instance of the same rot — output-guard's +// `gate 1` asserts a hardcoded corpus count and has therefore been failing, +// and validating nothing, since a 9th corpus was added. +// +// So: feed each checker a deliberately broken pipeline output and assert it +// goes RED. These tests fail if a checker stops catching what it exists to +// catch — the bite-test discipline, made permanent. + +import { test } from "node:test"; +import assert from "node:assert/strict"; + +import { writeFile, mkdtemp, rm } from "node:fs/promises"; +import { tmpdir } from "node:os"; +import { join } from "node:path"; + +import { + findStabilityViolations, + findStabilityExemptions, + findSafetyViolations, + findSequenceViolations, + firstDivergence, + censusPair, + semanticCore, + readCapture, + findMitigationGaps, +} from "../tools/replay.mjs"; + +const user = (t) => ({ role: "user", content: [{ type: "text", text: t }] }); +const asst = (t) => ({ role: "assistant", content: [{ type: "text", text: t }] }); + +// One capture entry as the replay loop builds it. +const entry = (n, inMsgs, outMsgs, extra = {}) => ({ + n, + ts: `2026-07-28T00:00:${String(n).padStart(2, "0")}Z`, + key: "k", + inMsgs, + outMsgs, + action: null, + resetReason: null, + ...extra, +}); + +// --- Stability gate --- + +test("stability: clean append-only traffic is GREEN", () => { + const a = [user("u0"), asst("a1")]; + const b = [user("u0"), asst("a1"), user("u2")]; + const v = findStabilityViolations([entry(0, a, a), entry(1, b, b)]); + assert.equal(v.length, 0); +}); + +test("stability: BITE — output diverging earlier than input is caught", () => { + const a = [user("u0"), asst("a1"), user("u2")]; + const b = [user("u0"), asst("a1"), user("u2"), asst("a3")]; + // We mangle a message the input left untouched: output diverges at 1, + // input only at 3. + const bOut = [user("u0"), asst("MANGLED"), user("u2"), asst("a3")]; + const v = findStabilityViolations([entry(0, a, a), entry(1, b, bOut)]); + assert.equal(v.length, 1); + assert.equal(v[0].outDiv, 1); +}); + +test("stability: BITE — interleaved co-tenant traffic must not hide a violation", () => { + // The exact defect that shipped: conversation A's two requests are + // separated by an unrelated conversation B. An adjacent-only scan compares + // A->B and B->A (both skipped as different conversations) and never + // compares A->A, reporting a clean run. + const a1 = [user("convA"), asst("a1")]; + const a2 = [user("convA"), asst("a1"), user("more")]; + const a2Out = [user("convA"), asst("CORRUPTED"), user("more")]; + const b1 = [user("convB-different-first-message"), asst("b1")]; + + const v = findStabilityViolations([ + entry(0, a1, a1), + entry(1, b1, b1), // co-tenant request in between + entry(2, a2, a2Out), + ]); + assert.equal(v.length, 1, "the violation is in a non-adjacent pair"); + assert.equal(v[0].n, 2); + assert.equal(v[0].prevN, 0, "compared against the previous SAME-conversation request"); +}); + +test("stability: input churn we merely pass through is NOT ours", () => { + // CC itself rewrote history at index 1; forwarding that untouched must not + // be reported. Only an output divergence EARLIER than the input's counts. + const a = [user("u0"), asst("a1"), user("u2")]; + const b = [user("u0"), asst("CC-CHANGED-THIS"), user("u2")]; + const v = findStabilityViolations([entry(0, a, a), entry(1, b, b)]); + assert.equal(v.length, 0); +}); + +// The attribution the violation line now carries, so nobody hand-derives it +// again. Three separate throwaway probes were written on 2026-07-28 to answer +// exactly this question — the probe is the tell that the check was missing. +test("stability: reports whether CC's own bytes at outDiv were identical", () => { + // CC's message 1 unchanged; ours mangled -> the divergence is OURS. + const a = [user("u0"), asst("a1"), user("u2")]; + const b = [user("u0"), asst("a1"), user("EDITED-BY-CC")]; + const bOut = [user("u0"), asst("MANGLED-BY-US"), user("EDITED-BY-CC")]; + const v = findStabilityViolations([entry(0, a, a), entry(1, b, bOut)]); + assert.equal(v.length, 1); + assert.equal(v[0].outDiv, 1); + assert.equal(v[0].ccIdenticalAtOutDiv, true, "CC sent identical bytes at index 1 — ours by construction"); +}); + +test("stability: BITE — when CC ALSO changed the diverging index, say so", () => { + // Both sides changed index 1: ours is amplification at worst, and claiming + // "ours by construction" there would be a false attribution. + const a = [user("u0"), asst("a1"), user("u2")]; + const b = [user("u0"), asst("CC-CHANGED"), user("u2")]; + const bOut = [user("u0"), asst("WE-CHANGED-DIFFERENTLY"), user("u2")]; + const v = findStabilityViolations([entry(0, a, a), entry(1, b, bOut)]); + // input diverges at 1 too, so the bar is 1 and outDiv 1 is not < 1 — + // no violation. Construct the amplifying case instead: CC changes at 2. + assert.equal(v.length, 0); + const c = [user("u0"), asst("a1"), user("CC-CHANGED-HERE")]; + const cOut = [user("u0"), asst("WE-CHANGED"), user("CC-CHANGED-HERE")]; + const v2 = findStabilityViolations([entry(0, a, a), entry(1, c, cOut)]); + assert.equal(v2.length, 1); + assert.equal(v2[0].ccIdenticalAtOutDiv, true, "CC's bytes at index 1 were identical"); +}); + +// --- fresh-session-sort's telemetry-keyed exemption (2026-07-30) --- +// +// The real case (s-58c979ce n=2024->2025): CC's own array first diverges at +// index 1 (a new scattered block appears), our output diverges EARLIER, at +// index 0 (the relocate branch prepends it to messages[0]) — exactly the +// stability check's violation shape, but a DELIBERATE one-time relocation +// bust, not a self-inflicted regression. The exemption must come from the +// extension's own report (ctx.meta.freshSessionSortStats), never a +// re-derived guess from the divergence shape alone — mirroring +// suppressedIndices' discipline. + +test("stability: a first-appearance relocation WITH telemetry is exempt, not a violation", () => { + const a = [user("u0"), asst("a1")]; + const bIn = [user("u0"), asst("CC-ADDED-SCATTERED-SKILLS-BLOCK")]; + const bOut = [user("RELOCATED-SKILLS-PREPENDED-u0"), asst("CC-ADDED-SCATTERED-SKILLS-BLOCK")]; + const v = findStabilityViolations([ + entry(0, a, a), + entry(1, bIn, bOut, { + freshSessionSortStats: { relocated: [{ type: "skills", firstAppearance: true }], targetIndex: 0 }, + }), + ]); + assert.equal(v.length, 0, "a telemetry-backed first-appearance relocation must not count as a violation"); + + const x = findStabilityExemptions([ + entry(0, a, a), + entry(1, bIn, bOut, { + freshSessionSortStats: { relocated: [{ type: "skills", firstAppearance: true }], targetIndex: 0 }, + }), + ]); + assert.equal(x.length, 1, "the exemption must be annotated in the output, not silently dropped"); + assert.equal(x[0].outDiv, 0); + assert.equal(x[0].exemptBasis.type, "skills"); +}); + +// The guard against shape-keyed drift: the SAME byte pattern (output +// diverges earlier than input, at the exact index fresh-session-sort would +// target) must stay a violation when the extension does not report it — +// simulating a pre-telemetry build, or any other extension producing the +// identical shape by coincidence. No telemetry, no exemption. +test("stability: BITE — the identical divergence WITHOUT telemetry stays a violation", () => { + const a = [user("u0"), asst("a1")]; + const bIn = [user("u0"), asst("CC-ADDED-SCATTERED-SKILLS-BLOCK")]; + const bOut = [user("RELOCATED-SKILLS-PREPENDED-u0"), asst("CC-ADDED-SCATTERED-SKILLS-BLOCK")]; + const v = findStabilityViolations([entry(0, a, a), entry(1, bIn, bOut)]); + assert.equal(v.length, 1, "the exemption must not fire on shape alone"); + assert.equal(v[0].outDiv, 0); + + const x = findStabilityExemptions([entry(0, a, a), entry(1, bIn, bOut)]); + assert.equal(x.length, 0); +}); + +// A second shape guard: telemetry present but reporting a RECURRING type +// (firstAppearance: false) — the extension itself distinguishes this from +// the deliberate one-time bust, and the checker must respect that. +test("stability: BITE — telemetry reporting a recurring (non-first-appearance) relocation stays a violation", () => { + const a = [user("u0"), asst("a1")]; + const bIn = [user("u0"), asst("CC-ADDED-SCATTERED-SKILLS-BLOCK")]; + const bOut = [user("RELOCATED-SKILLS-PREPENDED-u0"), asst("CC-ADDED-SCATTERED-SKILLS-BLOCK")]; + const v = findStabilityViolations([ + entry(0, a, a), + entry(1, bIn, bOut, { + freshSessionSortStats: { relocated: [{ type: "skills", firstAppearance: false }], targetIndex: 0 }, + }), + ]); + assert.equal(v.length, 1, "a recurring relocation is not the deliberate one-time bust and must not be exempted"); +}); + +// --- Safety gate --- + +test("safety: faithful passthrough is GREEN", () => { + const m = [user("u0"), asst("a1")]; + assert.equal(findSafetyViolations([entry(0, m, m)]).length, 0); +}); + +// deferred-tool-rewrite announces a newly-loaded tool with a system message +// carrying a tool_addition block — the documented contract, and the reason +// tools[] can stay byte-stable. The gate flagged 243 "corruptions" on a corpus +// where nothing was corrupted until this exemption existed. A check that +// forbids a designed behaviour trains its reader to ignore it. +test("safety: a declared tool_addition injection is NOT a violation", () => { + const inM = [user("u0"), asst("a1")]; + const outM = [ + user("u0"), + asst("a1"), + { role: "system", content: [{ type: "tool_addition", tool: { type: "tool_reference", name: "SendMessage" } }] }, + ]; + assert.equal(findSafetyViolations([entry(0, inM, outM)]).length, 0); +}); + +// The exemption must stay narrow: only a system message that is ENTIRELY +// tool_addition blocks. Anything else appearing in messages[] is still a +// violation, or the exemption becomes a hole. +test("safety: BITE — an undeclared injected message is still caught", () => { + const inM = [user("u0"), asst("a1")]; + const smuggled = [ + user("u0"), + asst("a1"), + { role: "system", content: [{ type: "text", text: "not a declared injection" }] }, + ]; + assert.equal(findSafetyViolations([entry(0, inM, smuggled)]).length, 1); + // ...and a system message mixing tool_addition with anything else. + const mixed = [ + user("u0"), + asst("a1"), + { + role: "system", + content: [ + { type: "tool_addition", tool: { type: "tool_reference", name: "X" } }, + { type: "text", text: "smuggled" }, + ], + }, + ]; + assert.equal(findSafetyViolations([entry(0, inM, mixed)]).length, 1); +}); + +test("safety: BITE — a dropped message is caught", () => { + const inM = [user("u0"), asst("a1"), user("u2")]; + const outM = [user("u0"), asst("a1")]; + const v = findSafetyViolations([entry(0, inM, outM)]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "length"); +}); + +test("safety: BITE — a reordered message is caught by role drift", () => { + // The live defect this check found: phase-2 insertion-normalization moved a + // system message to the tail, shifting three real turns. Length is + // preserved, so only a positional role comparison catches it. + const inM = [user("u0"), { role: "system", content: "note" }, asst("a1"), user("u2")]; + const outM = [user("u0"), asst("a1"), user("u2"), { role: "system", content: "note" }]; + const v = findSafetyViolations([entry(0, inM, outM)]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "role"); +}); + +test("safety: BITE — a broken tool_result/tool_use pairing is caught", () => { + const inM = [ + { role: "assistant", content: [{ type: "tool_use", id: "t1", name: "X", input: {} }] }, + { role: "user", content: [{ type: "tool_result", tool_use_id: "t1", content: "ok" }] }, + ]; + // Same length, same roles, but the tool_result no longer answers the + // preceding assistant turn — an API-shape break, not just a cache concern. + const outM = [ + { role: "assistant", content: [{ type: "tool_use", id: "DIFFERENT", name: "X", input: {} }] }, + { role: "user", content: [{ type: "tool_result", tool_use_id: "t1", content: "ok" }] }, + ]; + const v = findSafetyViolations([entry(0, inM, outM)]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "tool-adjacency"); +}); + +// --- Sequence gate --- + +test("sequence: normalize followed by settled append-only is GREEN", () => { + const m = [user("u0")]; + const v = findSequenceViolations([ + entry(0, m, m, { action: "normalized" }), + entry(1, m, m, { action: "append-only" }), + ]); + assert.equal(v.length, 0); +}); + +test("sequence: BITE — normalize then reset is caught", () => { + // The phase-2 splice->append pattern: request 2 looks like a win, request 3 + // resets because canonical order and wire order now disagree. Pairwise + // checks cannot see this; only the sequence can. + const m = [user("u0")]; + const v = findSequenceViolations([ + entry(0, m, m, { action: "normalized" }), + entry(1, m, m, { action: "reset", resetReason: "not-subsequence" }), + ]); + assert.equal(v.length, 1); + assert.equal(v[0].normalizedAt, 0); +}); + +// A reset is OUR failure only when CC left the history alone. If CC rewrote +// it, resetting is correct and flagging it is a check firing on a non-defect — +// the fault that trains a reader to ignore red. Measured 2026-07-28 on capture +// s-538c0aef request 109: CC replaced message 196 in place, so +// reset(edit-shaped) was right; the real cost of that event was our bytes +// moving at 177, which is the STABILITY gate's job and it caught it. +test("sequence: a reset AFTER CC rewrote history is honest, not a violation", () => { + const a = [user("u0"), asst("a1"), user("u2")]; + // CC edits message 1 in place — the history genuinely changed. + const b = [user("u0"), asst("CC-REWROTE-THIS"), user("u2")]; + const v = findSequenceViolations([ + entry(0, a, a, { action: "normalized" }), + entry(1, b, b, { action: "reset", resetReason: "edit-shaped" }), + ]); + assert.equal(v.length, 0, "resetting on a genuine history rewrite is correct behaviour"); +}); + +test("sequence: BITE — the exemption must not swallow an append-only reset", () => { + // Same shape, but CC only APPENDED. Nothing it sent changed, so a reset + // means our reconstruction broke on its own — still a violation. + const a = [user("u0"), asst("a1")]; + const b = [user("u0"), asst("a1"), user("u2")]; + const v = findSequenceViolations([ + entry(0, a, a, { action: "normalized" }), + entry(1, b, b, { action: "reset", resetReason: "edit-shaped" }), + ]); + assert.equal(v.length, 1, "an append-only pair gives the reset no excuse"); + assert.equal(v[0].normalizedAt, 0); +}); + +test("sequence: a first-request reset is bookkeeping, not a violation", () => { + // no-prior-canonical means "nothing cached yet" — every conversation's + // first request does this and it costs nothing. + const m = [user("u0")]; + const v = findSequenceViolations([ + entry(0, m, m, { action: "normalized" }), + entry(1, m, m, { action: "reset", resetReason: "no-prior-canonical" }), + ]); + assert.equal(v.length, 0); +}); + +// --- Census --- + +test("census: decoration does not register as a structural change", () => { + // Shape flip (single text block <-> bare string) plus a system-reminder + // block appearing: both are re-serializations, neither is a history edit. + // Measured at ~27% of real request pairs — if the census counted these as + // changes, its signal would be swamped by noise. + const a = [{ role: "user", content: [{ type: "text", text: "hi" }] }]; + const b = [{ role: "user", content: "hi" }]; + assert.equal(censusPair(a, b), "identical"); + + const withReminder = [ + { + role: "user", + content: [ + { type: "text", text: "hi" }, + { type: "text", text: "\nnote\n" }, + ], + }, + ]; + assert.equal(censusPair(a, withReminder), "identical"); +}); + +test("census: real structural changes are classified, not smoothed away", () => { + const base = [user("u0"), asst("a1"), user("u2")]; + assert.equal(censusPair(base, [...base, asst("a3")]), "append-only"); + assert.equal(censusPair(base, [user("u0"), asst("a1"), user("SPLICED"), user("u2")]), "splice/insert-mid"); + assert.equal(censusPair(base, [user("u0"), asst("a1")]), "drop-only"); + assert.equal(censusPair(base, [user("u0"), asst("a1"), user("EDITED")]), "replace/edit"); +}); + +test("census: semanticCore keeps genuinely different content distinct", () => { + // The fold must be narrow. A multi-block message is not the same as its + // first block, and different text is never the same message. + assert.notDeepEqual(semanticCore(user("a")), semanticCore(user("b"))); + const multi = { + role: "user", + content: [ + { type: "text", text: "one" }, + { type: "text", text: "two" }, + ], + }; + assert.equal(semanticCore(multi).length, 2); +}); + +// --- Corpus reader --- +// +// The gate slurped its capture with readFile(..., "utf-8") until 2026-07-28, +// when pointing it at a live 955 MB session capture threw +// `RangeError: Invalid string length` — V8's max string size. So the gate +// could not run at all on the largest, most interesting corpus, while every +// small corpus stayed green. It is now a line-by-line stream. +// +// The crash was loud and self-announcing. What is NOT loud is the INDEXING: +// the old form filtered blank lines away before indexing, so `n` counted +// only non-blank lines. `--restart-at N` / `--wipe-state-at N` and every +// violation report are stated in that same `n`. If a future rewrite counts +// blank lines, those indices all shift by a silent off-by-k and point at the +// wrong request — a wrong answer rather than a crash. Pin the semantics. + +test("readCapture: blank lines are skipped WITHOUT consuming an index", async () => { + const dir = await mkdtemp(join(tmpdir(), "cache-fix-readcapture-")); + try { + const file = join(dir, "c.jsonl"); + // Blank and whitespace-only lines interleaved, plus a trailing newline. + await writeFile(file, ['{"i":0}', "", '{"i":1}', " ", '{"i":2}', ""].join("\n") + "\n"); + + const seen = []; + for await (const [n, line] of readCapture(file)) seen.push([n, JSON.parse(line).i]); + + assert.deepEqual( + seen, + [ + [0, 0], + [1, 1], + [2, 2], + ], + "index n must equal the position among NON-BLANK lines", + ); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("readCapture: an empty corpus yields nothing rather than one blank entry", async () => { + const dir = await mkdtemp(join(tmpdir(), "cache-fix-readcapture-")); + try { + const file = join(dir, "empty.jsonl"); + await writeFile(file, "\n\n"); + const seen = []; + for await (const e of readCapture(file)) seen.push(e); + assert.equal(seen.length, 0); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +// --- Primitive --- + +test("firstDivergence: prefix growth reports null, in-place change reports the index", () => { + assert.equal(firstDivergence([1, 2], [1, 2, 3]), null); + assert.equal(firstDivergence([1, 2, 3], [1, 9, 3]), 1); + assert.equal(firstDivergence([], []), null); +}); + +// --- Mitigation gaps --- +// +// The four gates ask "did we make it worse". None asks "did we fail to help", +// and a reset forwards CC's bytes faithfully — invisible to all of them while +// costing the whole rewrite. On 2026-07-28 a 484k bust had every gate green +// and it took hand-reading extension telemetry to establish we had not +// mitigated it. + +test("mitigation: a normalized splice counts as absorbed and costs nothing", () => { + const a = [user("u0"), asst("a1"), user("u2")]; + const b = [user("u0"), asst("a1"), user("SPLICED"), user("u2")]; + const rows = findMitigationGaps([ + entry(0, a, a, { action: "append-only" }), + entry(1, b, b, { action: "normalized" }), + ]); + assert.equal(rows.length, 1); + assert.equal(rows[0].kind, "splice/insert-mid"); + assert.equal(rows[0].mitigated, true); + assert.equal(rows[0].rebilledBytes, 0); +}); + +test("mitigation: BITE — a RESET on a mitigable event is a miss, and is priced", () => { + const a = [user("u0"), asst("a1"), user("u2")]; + const b = [user("u0"), asst("a1"), user("SPLICED"), user("u2")]; + const rows = findMitigationGaps([ + entry(0, a, a, { action: "append-only" }), + entry(1, b, b, { action: "reset", resetReason: "not-subsequence" }), + ]); + assert.equal(rows.length, 1); + assert.equal(rows[0].mitigated, false, "a reset forwards CC's array — it absorbs nothing"); + assert.equal(rows[0].resetReason, "not-subsequence"); + assert.ok(rows[0].rebilledBytes > 0, "everything from the divergence index on is re-billed"); +}); + +test("mitigation: BITE — append-only on a mitigable event is ALSO a miss", () => { + // The subtle one. The extension reporting "append-only" while the census + // sees a mid-history splice means it did not DETECT the splice — the bytes + // go out unchanged either way. Measured twice in one session. + const a = [user("u0"), asst("a1"), user("u2")]; + const b = [user("u0"), asst("a1"), user("SPLICED"), user("u2")]; + const rows = findMitigationGaps([ + entry(0, a, a, { action: "append-only" }), + entry(1, b, b, { action: "append-only" }), + ]); + assert.equal(rows[0].mitigated, false); + assert.ok(rows[0].rebilledBytes > 0); +}); + +test("mitigation: honest history rewrites are NOT counted as missed mitigations", () => { + // replace/edit is CC rewriting its own history (rows 4/22) and drop-only is + // a prune. Neither is something this proxy claims to absorb, and counting + // them would inflate the miss rate with events no mitigation should touch. + const a = [user("u0"), asst("a1"), user("u2")]; + const edited = [user("u0"), asst("a1"), user("EDITED")]; + const dropped = [user("u0"), asst("a1")]; + assert.equal( + findMitigationGaps([entry(0, a, a, { action: "append-only" }), entry(1, edited, edited, { action: "reset" })]).length, + 0, + ); + assert.equal( + findMitigationGaps([entry(0, a, a, { action: "append-only" }), entry(1, dropped, dropped, { action: "reset" })]).length, + 0, + ); +}); + +// Occurrence ordinals in the census identity. Repeats are common — one +// measured history carried the same hook reminder 44 times, byte-identical — +// and without an ordinal a Set treats all 44 as one entry, so a plain tail +// append can read as a mid-history splice. insertion-normalization's own +// identityKey has been `hash|role|occurrence` all along; this is the census +// catching up to it. +test("census: repeated identical messages do not collapse into one identity", () => { + const dup = { role: "system", content: [{ type: "text", text: "recurring reminder" }] }; + const base = [user("u0"), dup, asst("a1"), dup, user("u2")]; + // A pure tail append over a history containing duplicates. + const grown = [...base, asst("a3")]; + assert.equal( + censusPair(base, grown), + "append-only", + "duplicates must not make a tail append look like a splice", + ); +}); + +test("census: BITE — a genuine splice is still caught when duplicates are present", () => { + const dup = { role: "system", content: [{ type: "text", text: "recurring reminder" }] }; + const base = [user("u0"), dup, asst("a1"), dup, user("u2")]; + const spliced = [user("u0"), dup, asst("a1"), dup, user("INSERTED"), user("u2")]; + assert.equal(censusPair(base, spliced), "splice/insert-mid"); +}); + +// --- Safety exemption symmetry (2026-07-29) --- +import { safetyViolation } from "../tools/replay.mjs"; + +test("BITE — an injection-shaped message in the INPUT must not read as a drop", () => { + // The live case: a chained proxy fed this pipeline its own output (the + // fable acceptance probe), so the INPUT carried a tool_addition system + // message. The output kept it and added the pipeline's own — nothing was + // dropped. The one-sided filter stripped both from out, none from in, and + // the first census-enabled sweep failed the capture over it (5 -> 4). + const injection = (name) => ({ + role: "system", + content: [{ type: "tool_addition", tool: { type: "tool_reference", name } }], + }); + const user = { role: "user", content: [{ type: "text", text: "q" }] }; + const asst = { role: "assistant", content: [{ type: "text", text: "a" }] }; + const e = { + n: 1, ts: "t", + inMsgs: [user, asst, user, injection("Monitor"), user], + outMsgs: [user, asst, user, injection("Monitor"), user, injection("Monitor")], + }; + assert.equal(safetyViolation(e), null, "echoed + re-injected announcements are exempt on both sides"); + // A GENUINE drop must still fire: remove a real user message from out. + const dropped = { ...e, outMsgs: [user, asst, injection("Monitor"), user] }; + const v = safetyViolation(dropped); + assert.ok(v && v.kind === "length", "a real message drop must still be caught"); +}); + +// --- Row 6: heldStable (shared-name subset) vs forwardedStable (whole array) --- +// +// forwardedStable compares the WHOLE forwarded tools[] signature across a +// pair, so a genuine new-tool announcement always reads as "unstable" even +// when every tool CC already knew about round-tripped byte-identical +// (BACKLOG "forwardedStable was a census framing gap" — bytes probe +// 2026-07-30: 100% of "unstable" pairs carried a genuine new-tool +// announcement, held/shared tools byte-identical on every checked repeat +// pair). heldStable narrows the claim to what deferred-tool-rewrite actually +// guarantees: the SHARED-name subset (tools present on BOTH sides of the +// pair) stays byte-stable. A tool that is new on one side is excluded from +// the comparison, not counted against it. +import { findToolsDeltas } from "../tools/replay.mjs"; + +const conv = [user("shared-first-message")]; +const tool = (name, extra = {}) => ({ name, description: `${name} tool`, input_schema: { type: "object" }, ...extra }); + +test("toolsDeltas: heldStable true / forwardedStable false when a tool is ADDED and the shared subset is untouched", () => { + const toolA = tool("A"); + const toolB = tool("B"); + const toolC = tool("C"); + const prevTools = [toolA, toolB]; + const curTools = [toolA, toolB, toolC]; + const p = entry(1, conv, conv, { inTools: prevTools, outTools: prevTools }); + const c = entry(2, conv, conv, { inTools: curTools, outTools: curTools }); + const [d] = findToolsDeltas([p, c]); + assert.ok(d, "an added tool must register as a tools[] delta"); + assert.equal(d.forwardedStable, false, "the whole-array signature moved when C was added"); + assert.equal(d.heldStable, true, "A and B — the shared-name subset — round-tripped byte-identical"); +}); + +test("toolsDeltas: BITE — a mutated SHARED tool sinks both forwardedStable and heldStable", () => { + const toolA = tool("A"); + const toolB = tool("B"); + const toolBMutated = tool("B", { description: "changed" }); + const prevTools = [toolA, toolB]; + const curTools = [toolA, toolBMutated]; + const p = entry(1, conv, conv, { inTools: prevTools, outTools: prevTools }); + const c = entry(2, conv, conv, { inTools: curTools, outTools: curTools }); + const [d] = findToolsDeltas([p, c]); + assert.ok(d, "a schema edit to a held tool must still register as a delta"); + assert.equal(d.forwardedStable, false); + assert.equal( + d.heldStable, + false, + "B changed inside the shared-name subset — heldStable must catch it, not just the whole array", + ); +}); + +test("toolsDeltas: forwarded tools[] fully steady across an incoming reorder reads true on both", () => { + const toolA = tool("A"); + const toolB = tool("B"); + const p = entry(1, conv, conv, { inTools: [toolA, toolB], outTools: [toolA, toolB] }); + const c = entry(2, conv, conv, { inTools: [toolB, toolA], outTools: [toolA, toolB] }); + const [d] = findToolsDeltas([p, c]); + assert.ok(d, "CC reordering its incoming tools[] must still register as a delta"); + assert.equal(d.kind, "reorder"); + assert.equal(d.forwardedStable, true, "what we forwarded never moved"); + assert.equal(d.heldStable, true, "the shared-name subset IS the whole forwarded array here, and it is untouched"); +}); + +// --- Block-migration FLAP --- +// +// A one-way block migration is absorbable by the volatile pin. An +// OSCILLATION is not, when the pin classifies only one of the two shapes: +// the block keeps leaving and returning, so it busts on every second flip at +// best. The 2026-07-30 221k event (threat matrix row 4, session 0d6f38ba, +// n=102->104->105->108 in 11 seconds) was exactly that, and the only way to +// see it was to read three adjacent census lines and notice the direction +// column alternate. These tests are the definition of that reading, made +// mechanical — see the DEFINITION comment above markFlaps in replay.mjs. +import { findBlockMigrations } from "../tools/replay.mjs"; + +const txt = (t) => ({ type: "text", text: t }); +const REMINDER_WRAPPED = "\nPreToolUse:Edit hook additional context: do the thing\n"; +const REMINDER_INNER = "PreToolUse:Edit hook additional context: do the thing"; + +// The two shapes the measured flap alternated between. Message COUNT is equal +// in both, which is what makes each pair a replace/edit — the kind the +// measured triple carried (edit@86 of 98). +const inlineState = (tail = []) => [ + user("q1"), + asst("a1"), + { role: "user", content: [txt("tool output"), txt(REMINDER_WRAPPED)] }, + { role: "system", content: "unrelated standing system note" }, + asst("a2"), + ...tail, +]; +const standaloneState = (tail = []) => [ + user("q1"), + asst("a1"), + { role: "user", content: [txt("tool output"), txt("sibling block that never moves")] }, + { role: "system", content: REMINDER_INNER }, + asst("a2"), + ...tail, +]; +const asEntries = (states) => states.map((msgs, i) => entry(i, msgs, msgs)); + +test("BITE — the same block reversing direction in the next request is annotated as a FLAP", () => { + // The measured triple's shape: inline -> standalone -> inline -> standalone. + const rows = findBlockMigrations(asEntries([inlineState(), standaloneState(), inlineState(), standaloneState()])); + assert.equal(rows.length, 3, "one migration row per flip"); + assert.deepEqual( + rows.map((r) => r.direction), + ["inline->standalone", "standalone->inline", "inline->standalone"], + ); + assert.equal(rows[0].flap, undefined, "the FIRST leg reverses nothing — it is a plain migration"); + assert.deepEqual( + rows[1].flap, + { reversesPrevN: 0, reversesN: 1, span: 1 }, + "leg 2 reverses leg 1 one request later, and names the row it reverses", + ); + assert.deepEqual(rows[2].flap, { reversesPrevN: 1, reversesN: 2, span: 1 }, "leg 3 reverses leg 2"); +}); + +test("flap: BITE — the window counts requests of the CONVERSATION, not of the wire", () => { + // Cache prefixes are per-conversation, so a co-tenant's traffic between the + // two legs is not part of this clock. Here the legs are 7 and 7 WIRE + // requests apart and 1 conversation request apart: a detector counting wire + // distance reports nothing on a flap that busts on every flip. + const other = (i) => [user("a different conversation entirely"), ...Array.from({ length: i }, (_, k) => asst(`o${k}`))]; + const wire = []; + let n = 0; + for (const state of [inlineState(), standaloneState(), inlineState()]) { + wire.push(entry(n++, state, state)); + for (let i = 0; i < 6; i++) wire.push(entry(n++, other(i), other(i))); + } + const rows = findBlockMigrations(wire); + assert.equal(rows.length, 2); + assert.equal(rows[0].flap, undefined); + assert.deepEqual(rows[1].flap, { reversesPrevN: 0, reversesN: 7, span: 1 }, "7 wire requests apart, 1 conversation request apart"); +}); + +// gap = conversation requests between the two migration rows. The requests in +// between are plain appends, which are not a migration kind and so produce no +// rows of their own — only distance. +const flapAtGap = (gap) => { + const filler = (k) => Array.from({ length: k }, (_, i) => asst(`filler-${i + 1}`)); + const states = [inlineState(), standaloneState()]; + for (let k = 1; k < gap; k++) states.push(standaloneState(filler(k))); + states.push(inlineState(filler(gap - 1))); + const rows = findBlockMigrations(asEntries(states)); + assert.equal(rows.length, 2, `gap=${gap}: exactly the two legs, appends contribute nothing`); + return rows[1]; +}; + +test("flap: a reversal exactly 5 conversation requests later is still a FLAP", () => { + assert.deepEqual(flapAtGap(5).flap, { reversesPrevN: 0, reversesN: 1, span: 5 }, "5 is within 5"); +}); + +test("flap: fires-on-non-defect guard — a reversal 6 conversation requests later is NOT a flap", () => { + // The window is what separates an oscillation from a block that migrated + // once and, much later, migrated back. A detector without an upper bound + // would mark the second as the first and train its reader to ignore the tag. + assert.equal(flapAtGap(6).flap, undefined); +}); + +test("flap: fires-on-non-defect guard — opposite directions by DIFFERENT blocks are not a flap", () => { + // Two distinct hook blocks, one leaving its host message and one returning + // to another, in consecutive requests. Every condition of the definition + // holds except identity of the block — which is the whole claim. + const X_WRAPPED = "\nhook X context\n"; + const X_INNER = "hook X context"; + const Y_WRAPPED = "\nhook Y context\n"; + const Y_INNER = "hook Y context"; + const s0 = [ + user("q1"), + asst("a1"), + { role: "user", content: [txt("tool output"), txt(X_WRAPPED)] }, + { role: "system", content: "unrelated standing system note" }, + { role: "system", content: Y_INNER }, + asst("a2"), + ]; + const s1 = [ + user("q1"), + asst("a1"), + { role: "user", content: [txt("tool output"), txt("sibling block")] }, + { role: "system", content: X_INNER }, + { role: "system", content: Y_INNER }, + asst("a2"), + ]; + const s2 = [ + user("q1"), + asst("a1"), + { role: "user", content: [txt("tool output"), txt("sibling block")] }, + // Y goes back INLINE, and a block only counts as inline when it wears the + // reminder wrapper there — same candidacy condition as X's leg. + { role: "user", content: [txt("other output"), txt(Y_WRAPPED)] }, + { role: "system", content: "a tail note" }, + asst("a2"), + ]; + const rows = findBlockMigrations(asEntries([s0, s1, s2])); + assert.equal(rows.length, 2); + assert.deepEqual( + rows.map((r) => r.direction), + ["inline->standalone", "standalone->inline"], + "opposite directions, one conversation request apart", + ); + assert.notEqual(rows[0].hash, rows[1].hash, "different blocks — the premise of this guard"); + assert.equal(rows[0].flap, undefined); + assert.equal(rows[1].flap, undefined, "a reversal is of the SAME block; two blocks passing each other is not one"); +}); + +// --- blockMigration candidacy: a message that SHED siblings is not a +// standalone emergence --- +// +// Measured on the real 2026-07-30 flap bytes (capture s-0d6f38ba, pair +// n=102->104; fixture flap-s-0dc8ac87c43d-86.json, harvested by the sibling +// build). The alignment there is: +// +// PREV[92] user [tool_result, text( 720 chars)] +// CUR [92] assistant (unrelated — two messages were inserted above) +// CUR [93] user [tool_result] <- PREV[92] having SHED its reminder +// CUR [94] system "…" (683 chars) <- PREV[92]'s reminder, unwrapped +// +// The census reported TWO migrations out of PREV[92]: the reminder to 94 +// (real) and the tool_result to 93 (phantom). The phantom exists because +// `standalone` is `blocks.length === 1`, which is true of any message that +// shrank to one block, and because the host's own index moved, so the +// same-position guard never sees that the tool_result never left its message. +// +// DEFINITION the fix restores: the class the census names is the +// REMINDER swap. A block is a migration candidate only where it appears +// -WRAPPED on its inline side — that wrapper is what makes +// the block decoration that CC relocates. A tool_result (or any ordinary +// block) left alone because its message shed siblings has not emerged as +// anything; it is where it always was, in a message that lost a neighbour. + +const toolResult = (id) => ({ type: "tool_result", tool_use_id: id, content: "out" }); + +test("BITE — a host that SHED a reminder does not also report its surviving block as migrated", () => { + const prev = [ + user("q1"), + asst("a1"), + { role: "user", content: [toolResult("tu1"), txt(REMINDER_WRAPPED)] }, + asst("a2"), + ]; + const cur = [ + user("q1"), + asst("a1"), + asst("inserted above the host — this is what shifts the host's index"), + { role: "user", content: [toolResult("tu1")] }, + { role: "system", content: REMINDER_INNER }, + asst("a2"), + ]; + const rows = findBlockMigrations([entry(0, prev, prev), entry(1, cur, cur)]); + assert.equal(rows.length, 1, "exactly ONE block left that message: the reminder"); + assert.equal(rows[0].direction, "inline->standalone"); + assert.equal(rows[0].sourceIdx, 2); + assert.equal(rows[0].targetIdx, 4, "the unwrapped reminder's new standalone message, not the shrunken host at 3"); +}); + +test("BITE — the same phantom in reverse: a host REGAINING a reminder is not its block migrating inline", () => { + // Mirror of the measured pair n=104->105: the shrunken host takes its + // reminder back and the standalone system message disappears. Only the + // reminder moved; the tool_result sat still while its message grew. + // + // The trailing turn on the CUR side is load-bearing, not decoration: with + // the two messages only DISAPPEARING, censusIds classifies the pair + // `drop-only`, which is not a migration kind, and the scan never runs at + // all — the measured pair carried 99 messages on both sides for the same + // reason. Without it this test passes while checking nothing. + const prev = [ + user("q1"), + asst("a1"), + asst("inserted above the host — this is what shifts the host's index"), + { role: "user", content: [toolResult("tu1")] }, + { role: "system", content: REMINDER_INNER }, + asst("a2"), + ]; + const cur = [ + user("q1"), + asst("a1"), + { role: "user", content: [toolResult("tu1"), txt(REMINDER_WRAPPED)] }, + asst("a2"), + asst("a new turn, so the pair is a replace/edit rather than a drop-only"), + ]; + const rows = findBlockMigrations([entry(0, prev, prev), entry(1, cur, cur)]); + assert.equal(rows.length, 1, "only the reminder changed host"); + assert.equal(rows[0].direction, "standalone->inline"); + assert.equal(rows[0].sourceIdx, 4, "the standalone system message that disappeared"); + assert.equal(rows[0].targetIdx, 2, "the message that took the reminder back inline"); +}); + +// --- The real 2026-07-30 flap, from the harvested bytes --- +// +// The two bites above reproduce the measured SHAPE synthetically. This one +// runs the actual capture bytes, so the check is anchored to a fixed +// reference that outlives the capture (which rotates): fixture +// flap-s-0dc8ac87c43d-86.json holds the full message arrays for all four +// requests of the three flap pairs. +// +// Expected values come from the DEFINITION, not from what the census +// currently prints: ONE reminder block leaves msg92 and comes back, three +// times. So there are three migration rows, all carrying the SAME block +// hash, and the two that reverse a predecessor are flaps. Before the +// candidacy fix this fixture produced six rows and four flaps — the +// tool_result of msg92 was reported as migrating to msg93, which is msg92 +// itself, having shed the reminder and shifted index. +import { readFileSync } from "node:fs"; +import { dirname } from "node:path"; // `join` is already imported at the top of this file +import { fileURLToPath } from "node:url"; + +const FLAP_FIXTURE = JSON.parse( + readFileSync(join(dirname(fileURLToPath(import.meta.url)), "fixtures", "harvested", "flap-s-0dc8ac87c43d-86.json"), "utf-8"), +); + +test("BITE — the real 2026-07-30 flap: one reminder block, three legs, two of them flaps", () => { + const rows = findBlockMigrations( + FLAP_FIXTURE.requests.map((r) => ({ + n: r.n, ts: r.ts, key: "s-0d6f38ba", inMsgs: r.messages, outMsgs: r.messages, inTools: [], outTools: [], + })), + ); + + assert.equal(rows.length, 3, "three pairs, one block changing host in each"); + assert.equal(new Set(rows.map((r) => r.hash)).size, 1, "the SAME block throughout — that is what makes it one flap"); + assert.deepEqual( + rows.map((r) => `n=${r.prevN}->${r.n} ${r.direction} ${r.sourceIdx}->${r.targetIdx}`), + [ + "n=102->104 inline->standalone 92->94", + "n=104->105 standalone->inline 94->92", + "n=105->108 inline->standalone 92->94", + ], + ); + assert.equal( + rows.filter((r) => r.targetIdx === 93 || r.sourceIdx === 93).length, + 0, + "msg93 is msg92 after shedding its reminder — nothing migrated to or from it", + ); + + assert.equal(rows[0].flap, undefined, "the opening leg reverses nothing"); + assert.deepEqual(rows[1].flap, { reversesPrevN: 102, reversesN: 104, span: 1 }); + assert.deepEqual(rows[2].flap, { reversesPrevN: 104, reversesN: 105, span: 1 }); +}); + +// ===================================================================== +// Content conservation — the fifth gate +// ===================================================================== +// +// The DEFINITION lives beside the implementation (tools/replay.mjs, "Content +// conservation: the fifth gate"). These assertions are derived from THAT +// definition and not from what the implementation currently prints — the +// same-parentage trap the dev-loop names: an expectation taken from the code +// pins the bug it should catch. +// +// The four older gates are all positional: they compare our array against +// CC's, or ours against our own predecessor. None of them can see a message +// CC sent that we never forwarded and whose content exists nowhere else, +// because a deletion that leaves the survivors positionally consistent is +// invisible to every one of them. That is exactly what pin-and-suppress does +// on purpose, so "the copy really is on the wire" needs its own check. + +import { findConservationViolations, conservationViolations } from "../tools/replay.mjs"; + +const sysStr = (t) => ({ role: "system", content: t }); + +// A pinned host: an ordinary block plus one reminder-wrapped block, the shape +// every suppression in this pipeline reconstructs from. +const host = (body, ...reminders) => ({ + role: "user", + content: [txt(body), ...reminders.map((r) => txt(`\n${r}\n`))], +}); + +test("conservation: clean pass-through traffic is GREEN", () => { + const msgs = [user("u0"), asst("a1"), host("tool output", "hook says hi")]; + assert.deepEqual(findConservationViolations([entry(0, msgs, msgs)]), []); +}); + +test("conservation: BITE — a message CC sent that we silently dropped is caught", () => { + // No declaration of any kind: the forwarded array is simply one message + // shorter. The safety gate catches this one too (length), but only because + // the count changed — the point of the next bite is that conservation + // catches it when the count does NOT. + const inM = [user("u0"), asst("a1"), user("the message we lost")]; + const outM = [user("u0"), asst("a1")]; + const v = findConservationViolations([entry(0, inM, outM)]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "lost"); +}); + +test("conservation: BITE — content lost while the message COUNT stays equal", () => { + // The class no positional gate can see: same length, same roles, same + // order, tool adjacency intact — and one block of real content gone. + const inM = [user("u0"), asst("a1"), host("tool output", "hook context worth keeping")]; + const outM = [user("u0"), asst("a1"), { role: "user", content: [txt("tool output")] }]; + const v = findConservationViolations([entry(0, inM, outM)]); + assert.equal(v.length, 1, "the reminder block vanished with nothing accounting for it"); + assert.equal(v[0].kind, "lost"); + assert.match(v[0].detail, /in\[2\]/); +}); + +test("conservation: BITE — a DECLARED suppression with no copy on the wire is caught", () => { + // This is the shape the unit-2 mitigation could get wrong: declaring a + // suppression makes the safety gate exempt the message (it reads + // stats.suppressions), so a suppression whose content is NOT reconstructible + // would otherwise pass every existing check. + const inM = [user("u0"), asst("a1"), sysStr("bytes that exist nowhere else")]; + const outM = [user("u0"), asst("a1")]; + const v = findConservationViolations([ + entry(0, inM, outM, { stats: { suppressions: [{ index: 2, hash: "h" }] } }), + ]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "suppressed-without-copy"); +}); + +test("conservation: a declared suppression whose per-block copy IS forwarded is GREEN", () => { + // The original #76606 shape: the standalone carries the reminder's UNWRAPPED + // text, and the pinned host still forwards it wrapped. Same unit either way. + const inM = [user("u0"), asst("a1"), host("tool output", "hook context"), sysStr("hook context")]; + const outM = [user("u0"), asst("a1"), host("tool output", "hook context")]; + const v = findConservationViolations([ + entry(0, inM, outM, { stats: { suppressions: [{ index: 3, hash: "h" }] } }), + ]); + assert.deepEqual(v, []); +}); + +test("conservation: a declared suppression matching a forwarded JOIN is GREEN", () => { + // The merged-standalone shape (78940a0): CC migrates ALL of a message's + // reminders out together as one standalone, joined with "\n\n". The copy on + // the wire is the host's blocks, and only their JOIN equals the suppressed + // bytes — a per-block check alone would call this a lost message. + const merged = "first hook\n\nsecond hook"; + const inM = [user("u0"), asst("a1"), host("tool output", "first hook", "second hook"), sysStr(merged)]; + const outM = [user("u0"), asst("a1"), host("tool output", "first hook", "second hook")]; + const v = findConservationViolations([ + entry(0, inM, outM, { stats: { suppressions: [{ index: 3, hash: "h" }] } }), + ]); + assert.deepEqual(v, [], "the join of the host's two reminder blocks IS the suppressed message"); +}); + +test("conservation: BITE — a join that is missing a constituent is NOT reconstructible", () => { + // Fires-on-a-non-defect's mirror: the check must not accept any string that + // merely CONTAINS a forwarded block. Here the suppressed standalone joins a + // forwarded reminder with text that was never on the wire, which is exactly + // the cross-message shape the mitigation must not paper over. + const merged = "first hook\n\ncontent that exists nowhere in the forwarded array"; + const inM = [user("u0"), asst("a1"), host("tool output", "first hook"), sysStr(merged)]; + const outM = [user("u0"), asst("a1"), host("tool output", "first hook")]; + const v = findConservationViolations([ + entry(0, inM, outM, { stats: { suppressions: [{ index: 3, hash: "h" }] } }), + ]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "suppressed-without-copy"); +}); + +test("conservation: BITE — a block we INVENTED is caught", () => { + const inM = [user("u0"), asst("a1")]; + const outM = [user("u0"), asst("a1"), sysStr("text CC never sent anywhere")]; + const v = findConservationViolations([entry(0, inM, outM)]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "invented"); +}); + +test("conservation: re-serving bytes CC sent EARLIER in this conversation is GREEN", () => { + // What the volatile pin does on every request: the host arrives with its + // reminder stripped and we forward the first-seen form. The bytes are not in + // THIS request, so the F-side clause only holds because they were in an + // earlier one of the same conversation. + const r0 = [user("u0"), asst("a1"), host("tool output", "hook context")]; + const r1 = [user("u0"), asst("a1"), { role: "user", content: [txt("tool output")] }, asst("a2")]; + const f1 = [user("u0"), asst("a1"), host("tool output", "hook context"), asst("a2")]; + const v = findConservationViolations([entry(0, r0, r0), entry(1, r1, f1)]); + assert.deepEqual(v, []); +}); + +test("conservation: BITE — first-seen bytes from a DIFFERENT conversation do not count", () => { + // The registry is per conversation because a cache prefix is: serving one + // tenant's bytes into another tenant's history is invention, not a re-serve. + // Identical to the test above except that the earlier request opens with a + // different first message, which is the conversation identity every other + // checker in this file uses. + const other = [user("DIFFERENT conversation opener"), asst("a1"), host("tool output", "hook context")]; + const r1 = [user("u0"), asst("a1"), { role: "user", content: [txt("tool output")] }, asst("a2")]; + const f1 = [user("u0"), asst("a1"), host("tool output", "hook context"), asst("a2")]; + const v = findConservationViolations([entry(0, other, other), entry(1, r1, f1)]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "invented"); +}); + +test("conservation: deferred-tool-rewrite's declared tool_addition is GREEN", () => { + // The same declared injection the safety gate already exempts. Counting it + // here would re-create the 243-false-positive incident one gate over. + const inM = [user("u0"), asst("a1")]; + const outM = [ + user("u0"), + { role: "system", content: [{ type: "tool_addition", tool: { type: "tool_reference", name: "WebFetch" } }] }, + asst("a1"), + ]; + assert.deepEqual(findConservationViolations([entry(0, inM, outM)]), []); +}); + +test("conservation: assistant-side rewrites are OUT of the population, and counted as residue", () => { + // tool-input-normalize rewrites assistant tool_use inputs in place and + // thinking sanitization drops thinking blocks — measured as the only + // non-conserved blocks across 936 live requests. They are a separately-gated + // class, so this gate must stay silent on them AND say how much it skipped. + const inM = [ + user("u0"), + { role: "assistant", content: [{ type: "thinking", thinking: "dropped later" }, { type: "tool_use", id: "t1", name: "Edit", input: { b: 2, a: 1 } }] }, + ]; + const outM = [ + user("u0"), + { role: "assistant", content: [{ type: "tool_use", id: "t1", name: "Edit", input: { a: 1, b: 2 } }] }, + ]; + const res = conservationViolations(entry(0, inM, outM), new Set()); + assert.deepEqual(res.violations, [], "assistant content is not this gate's population"); + assert.equal(res.assistantResidue, 2, "and the two blocks it did not examine are reported, not hidden"); +}); + +// The cross-message join needs a PRIOR request in every case below, and that +// is not test scaffolding — it is the definition. A re-served constituent is +// legitimate only because CC itself sent those bytes earlier in this +// conversation; without that request the F-side clause correctly calls the +// re-serve an invention, which is what the first draft of these three tests +// discovered by going red. +const NUDGE = "The task tools haven't been used recently."; +const MERGED = `hook context\n\n${NUDGE}`; +// The inline leg CC sent first: the host carries its reminder, the nudge +// stands alone after it. +const crossPrev = () => [user("u0"), asst("a1"), host("tool output", "hook context"), sysStr(NUDGE), asst("a2")]; +// The standalone leg: the host has shed its reminder and the two are merged +// into one message, which the extension declares suppressed. +const crossCur = () => [user("u0"), asst("a1"), { role: "user", content: [txt("tool output")] }, sysStr(MERGED), asst("a2")]; +const crossSuppressed = { stats: { suppressions: [{ index: 3, hash: "h" }] } }; + +test("conservation: a suppression matching a CROSS-MESSAGE join of two forwarded messages is GREEN", () => { + // The 2026-07-30 flap's novel leg (fixture flap-s-0dc8ac87c43d-86.json, msg91): + // CC merged one message's reminder with the WHOLE standalone that followed + // it. The copy on the wire is split across two ADJACENT forwarded messages — + // the pinned host, and the re-served standalone right after it. + const f = crossPrev(); + const v = findConservationViolations([ + entry(0, crossPrev(), crossPrev()), + entry(1, crossCur(), f, crossSuppressed), + ]); + assert.deepEqual(v, [], "reminder host + the standalone after it reconstruct the merged message"); +}); + +test("conservation: BITE — a cross-join whose SECOND constituent is not on the wire is caught", () => { + // Naive suppression, which is the failure this gate exists to name: suppress + // the merged message, re-serve nothing, and the standalone's bytes leave the + // conversation entirely. Identical to the GREEN case except that the + // re-served standalone is absent from the forwarded array. + const f = crossPrev().filter((m) => m.content !== NUDGE); + const v = findConservationViolations([ + entry(0, crossPrev(), crossPrev()), + entry(1, crossCur(), f, crossSuppressed), + ]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "suppressed-without-copy"); +}); + +test("conservation: BITE — cross-join constituents must be ADJACENT and in wire order", () => { + // Without the adjacency and ordering restriction, any two forwarded messages + // anywhere in a thousand-message history could be paired up to "explain" a + // suppression, which explains nothing. Same two constituents as the GREEN + // case, one unrelated turn between them. + const f = [user("u0"), asst("a1"), host("tool output", "hook context"), asst("a-between"), sysStr(NUDGE), asst("a2")]; + const v = findConservationViolations([ + entry(0, crossPrev(), crossPrev()), + entry(1, crossCur(), f, crossSuppressed), + ]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "suppressed-without-copy"); +}); + +test("conservation: fresh-session-sort's declared /clear-artifact strip is exempt", () => { + // Clause (c) of the definition, and the case that found it: the first sweep + // reported 645 `lost` rows on capture s-633915a8, all at message 0, and + // stage-by-stage replay named fresh-session-sort, which deletes the echo a + // slash command leaves behind. Declared behaviour, not lost conversation. + const inM = [ + { + role: "user", + content: [ + txt("the actual question"), + txt("Caveat: the messages below were generated…"), + txt("/compact"), + txt("Compacted…"), + ], + }, + ]; + const outM = [{ role: "user", content: [txt("the actual question")] }]; + assert.deepEqual(findConservationViolations([entry(0, inM, outM)]), []); +}); + +test("conservation: BITE — the strip exemption does NOT cover ordinary content", () => { + // The exemption must be the three declared tags and nothing adjacent to + // them; a check that swallows a real deletion because it sits next to a + // declared one is worse than no check. + const inM = [ + { + role: "user", + content: [txt("the actual question"), txt("/compact"), txt("real content CC sent")], + }, + ]; + const outM = [{ role: "user", content: [txt("the actual question")] }]; + const v = findConservationViolations([entry(0, inM, outM)]); + assert.equal(v.length, 1); + assert.equal(v[0].kind, "lost"); + assert.match(v[0].detail, /1 of 3/, "the declared artifact is exempt; the real block is not"); +}); diff --git a/test/replay-gate-warning.test.mjs b/test/replay-gate-warning.test.mjs new file mode 100644 index 00000000..73db3288 --- /dev/null +++ b/test/replay-gate-warning.test.mjs @@ -0,0 +1,200 @@ +// replay warns on gateless runs of gated captures — BACKLOG.md "READY — +// replay warns on gateless runs of gated captures". +// +// Grounding: the same operator-side instrument error happened three times in +// one day (2026-07-29) — a default-gates census booked a wrong matrix +// verdict, and two verification reruns repeated it, each time with the +// dev-loop warning already loaded. Prose was exhausted; this mechanizes the +// tell: replay.mjs already parses a capture's boot record (buildBootRecord, +// proxy/extensions/request-capture.mjs) into `boots`, and the boot record +// already carries the CACHE_FIX_* gates the traffic was served under. +// +// This spawns the REAL CLI (node tools/replay.mjs ...), not the exported +// pure functions in isolation, because the thing under test is what a reader +// actually sees on stderr/stdout — the same reasoning replay-class-matrix +// gives for running the real pipeline instead of just its classifiers. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { spawnSync } from "node:child_process"; +import { mkdtemp, writeFile, rm } from "node:fs/promises"; +import { tmpdir } from "node:os"; +import { join, dirname } from "node:path"; +import { fileURLToPath } from "node:url"; + +import { readBootRecords, resolveGatesFromCapture } from "../tools/replay.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const REPLAY = join(__dirname, "..", "tools", "replay.mjs"); + +// Real gate names (image-strip.mjs, microcompact-stability.mjs, +// overage-warning.mjs) rather than invented ones — the boot record's own +// `gates` dict is just "every CACHE_FIX_* var present at boot", so any real +// name exercises the same code path, and using real ones means turning them +// on in the "gates passed" case cannot hit an unknown-flag code path. +const GATE_KEYS = ["CACHE_FIX_IMAGE_GUARD", "CACHE_FIX_NORMALIZE_MICROCOMPACT", "CACHE_FIX_OVERAGE_WARNING"]; + +function bootLine(gates) { + return JSON.stringify({ ts: "2026-07-29T00:00:00Z", type: "boot", pid: 1, proxyTree: "test", gates }); +} + +function reqLine(ts, messages) { + return JSON.stringify({ + ts, + id: `id-${ts}`, + sid: "test-sid", + key: "s-test-sid", + headers: { "anthropic-beta": null, "session-id": "test-sid" }, + body: { model: "claude-opus-5", system: [{ type: "text", text: "sys" }], messages }, + }); +} + +const u = (t) => ({ role: "user", content: [{ type: "text", text: t }] }); +const a = (t) => ({ role: "assistant", content: [{ type: "text", text: t }] }); + +async function writeFixture(dir, gates) { + const path = join(dir, "capture.jsonl"); + const lines = [ + bootLine(gates), + // Two requests of ONE growing conversation (shared first message) so the + // census has an actual pair to classify, not just single-message groups. + reqLine("2026-07-29T00:00:01Z", [u("hello")]), + reqLine("2026-07-29T00:00:02Z", [u("hello"), a("hi"), u("more")]), + ]; + await writeFile(path, lines.join("\n") + "\n"); + return path; +} + +// An explicit env (PATH only, plus whatever the case wants) so the test +// runner's own environment can never leak a CACHE_FIX_* var into the child — +// which would silently make the "empty effective env" case not actually +// empty and the bite meaningless. +function runReplay(file, envOverrides, extraArgs = []) { + return spawnSync(process.execPath, [REPLAY, file, "--census", "--json", ...extraArgs], { + encoding: "utf-8", + env: { PATH: process.env.PATH, ...envOverrides }, + }); +} + +// A restart mid-capture: first boot GATELESS (nothing declared), second +// boot declares GATE_KEYS — the shape --gates-from-capture exists for +// (BACKLOG.md: "extract gates via the ALL-boots union, never head -1"). +// One request sits under each boot so the boot record's own `afterRequest` +// bookkeeping (main()'s read loop) has something to attach to. +async function writeMultiBootFixture(dir, gates) { + const path = join(dir, "capture.jsonl"); + const lines = [ + bootLine({}), + reqLine("2026-07-29T00:00:00.500Z", [u("pre-restart")]), + bootLine(gates), + reqLine("2026-07-29T00:00:01Z", [u("hello")]), + reqLine("2026-07-29T00:00:02Z", [u("hello"), a("hi"), u("more")]), + ]; + await writeFile(path, lines.join("\n") + "\n"); + return path; +} + +test("gated capture replayed under empty env: warns on stderr, census stamped 'none'", async () => { + const dir = await mkdtemp(join(tmpdir(), "replay-gate-warn-")); + try { + const gates = Object.fromEntries(GATE_KEYS.map((k) => [k, "1"])); + const file = await writeFixture(dir, gates); + const res = runReplay(file, {}); + assert.equal(res.status, 0, `replay exited nonzero: ${res.stderr}`); + assert.ok( + res.stderr.includes( + "WARNING: replaying under DEFAULT gates — this traffic was served with 3 gate(s). Pass --gates-from-capture, --env, or use gate-live.", + ), + `expected warning on stderr, got: ${res.stderr}`, + ); + const out = JSON.parse(res.stdout); + assert.equal(out.census.gateSource, "none (capture declares 3)"); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("gated capture replayed WITH the declared gates: no warning, census stamped set", async () => { + const dir = await mkdtemp(join(tmpdir(), "replay-gate-warn-")); + try { + const gates = Object.fromEntries(GATE_KEYS.map((k) => [k, "1"])); + const file = await writeFixture(dir, gates); + const res = runReplay(file, gates); + assert.equal(res.status, 0, `replay exited nonzero: ${res.stderr}`); + assert.ok( + !res.stderr.includes("WARNING: replaying under DEFAULT gates"), + `expected no warning on stderr, got: ${res.stderr}`, + ); + const out = JSON.parse(res.stdout); + assert.equal(out.census.gateSource, "3 of 3 declared set"); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("capture with no declared gates: no warning, header names it explicitly", async () => { + const dir = await mkdtemp(join(tmpdir(), "replay-gate-warn-")); + try { + const file = await writeFixture(dir, {}); + const res = runReplay(file, {}); + assert.equal(res.status, 0, `replay exited nonzero: ${res.stderr}`); + assert.ok( + !res.stderr.includes("WARNING: replaying under DEFAULT gates"), + `expected no warning on stderr, got: ${res.stderr}`, + ); + const out = JSON.parse(res.stdout); + assert.equal(out.census.gateSource, "no gates declared in capture"); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +// --gates-from-capture — BACKLOG.md's mechanized remedy: the multi-boot +// case (first boot gateless, second declares gates) is exactly the shape +// the ALL-boots union exists for, and is the one an operator's --env +// hand-extraction would get wrong by reading only the FIRST boot record. +test("--gates-from-capture on a multi-boot fixture: no warning, header 'N of N declared set'", async () => { + const dir = await mkdtemp(join(tmpdir(), "replay-gate-warn-")); + try { + const gates = Object.fromEntries(GATE_KEYS.map((k) => [k, "1"])); + const file = await writeMultiBootFixture(dir, gates); + // No --env at all: the flag alone must resolve the union and set it, + // with nothing left for the operator to hand-extract. + const res = runReplay(file, {}, ["--gates-from-capture"]); + assert.equal(res.status, 0, `replay exited nonzero: ${res.stderr}`); + assert.ok( + !res.stderr.includes("WARNING: replaying under DEFAULT gates"), + `expected no warning on stderr, got: ${res.stderr}`, + ); + const out = JSON.parse(res.stdout); + assert.equal(out.census.gateSource, "3 of 3 declared set"); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +// The flag's own merge, asserted directly per BACKLOG's design ("--env +// still wins over the flag where both name a gate") — the CLI-spawning +// bites above cannot observe a per-key VALUE override (gateSourceSummary +// only checks presence, not value), so this calls the SAME merge function +// main() calls (resolveGatesFromCapture), never a re-derived one +// (dev-loop.md, "never hand-roll identity in a probe"). +test("--gates-from-capture: resolveGatesFromCapture lets an explicit --env value win per-key", async () => { + const dir = await mkdtemp(join(tmpdir(), "replay-gate-warn-")); + try { + const gates = Object.fromEntries(GATE_KEYS.map((k) => [k, "1"])); + const file = await writeMultiBootFixture(dir, gates); + const boots = await readBootRecords(file); + assert.equal(boots.length, 2, "fixture must carry both boot records for the union to be meaningful"); + + const merged = resolveGatesFromCapture(boots, { [GATE_KEYS[0]]: "override-value" }); + // The overridden key: --env wins. + assert.equal(merged[GATE_KEYS[0]], "override-value"); + // The other two declared gates: capture's own value survives untouched. + assert.equal(merged[GATE_KEYS[1]], "1"); + assert.equal(merged[GATE_KEYS[2]], "1"); + assert.equal(Object.keys(merged).length, 3, "no extra keys beyond the union + override"); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); diff --git a/test/session-key-invariants.test.mjs b/test/session-key-invariants.test.mjs new file mode 100644 index 00000000..edf26b6d --- /dev/null +++ b/test/session-key-invariants.test.mjs @@ -0,0 +1,127 @@ +// Cross-extension session-key invariants — the guard against "the lesson did +// not travel to the sibling". +// +// This exact failure happened twice in one day (2026-07-28), the second time +// costing real cache: +// +// insertion-normalization keyed persisted state on (session-id, +// system-prompt). Every subagent of a session runs the same agent prompt, +// so one bucket held 39 distinct conversations and 100% of conversation +// switches within a bucket reset (60/60). Fixed by adding a conversation +// sub-key: 0 resets across 940 requests. +// +// deferred-tool-rewrite had the IDENTICAL key and did not get the fix, +// because nothing connected the two. Its tool_addition announcement is +// anchored to a MESSAGE IDENTITY, so under a shared key the stored anchor +// belonged to another conversation's history, failed to match, and +// re-anchored to "after the last user message" — a different index every +// request. Measured: our output diverging at index 4 while CC's history was +// byte-identical through index 23, twice in one corpus. +// +// A fix applied to one consumer of a shared idea is not applied. So this file +// does not test a list someone maintains: it DISCOVERS every exported +// `*SessionKey` function under proxy/extensions/ and holds all of them to the +// same invariants. A new stateful extension is covered the moment it exports +// one, and an existing one cannot quietly regress. +// +// If a future extension legitimately needs a coarser key, this test failing is +// the conversation about it — which is the point. + +import { test } from "node:test"; +import assert from "node:assert/strict"; +import { readdir } from "node:fs/promises"; +import { join, dirname } from "node:path"; +import { fileURLToPath, pathToFileURL } from "node:url"; + +const EXT_DIR = join(dirname(fileURLToPath(import.meta.url)), "..", "proxy", "extensions"); + +// prefix-diff is exempt, and the exemption is checked rather than trusted. +// It keeps its FILE key at the session id deliberately (its design note 1: a +// path that moves with content misses its own baseline, so a bust never gets +// logged) and separates co-tenants INSIDE the file via tenantId. It also +// shapes no request — it is telemetry, so a coarse key costs attribution +// precision, not cache. The exemption is paired with an assertion that +// tenantId still exists, so if that design ever changes this guard notices +// instead of staying quietly satisfied. +const SEPARATES_INSIDE_THE_FILE = new Set(["prefix-diff.mjs"]); + +async function discoverKeyResolvers({ all = false } = {}) { + const found = []; + for (const f of (await readdir(EXT_DIR)).sort()) { + if (!f.endsWith(".mjs")) continue; + if (!all && SEPARATES_INSIDE_THE_FILE.has(f)) continue; + const mod = await import(pathToFileURL(join(EXT_DIR, f)).href); + for (const [name, fn] of Object.entries(mod)) { + if (typeof fn === "function" && /SessionKey$/.test(name)) { + found.push({ file: f, name, fn }); + } + } + } + return found; +} + +const HEADERS = { "x-claude-code-session-id": "shared-session" }; +const SYSTEM = [{ type: "text", text: "You are a Claude agent." }]; +const convA = [{ role: "user", content: [{ type: "text", text: "conversation A" }] }]; +const convB = [{ role: "user", content: [{ type: "text", text: "conversation B" }] }]; + +// The resolvers do not share a signature — insertion-normalization takes +// (headers, messages, system), deferred-tool-rewrite takes (headers, body). +// ARITY distinguishes them mechanically, so no name list is maintained here: +// a name list is the same hand-maintained roster this file exists to avoid. +function callResolver(fn, { messages, system }) { + return fn.length >= 3 + ? fn(HEADERS, messages, system) + : fn(HEADERS, { messages, system, model: "test-model" }); +} + +test("every extension exporting a *SessionKey is discovered", async () => { + const resolvers = await discoverKeyResolvers(); + assert.ok(resolvers.length >= 2, `expected at least the two stateful extensions, found ${resolvers.length}`); + const files = new Set(resolvers.map((r) => r.file)); + // These two are the reason the file exists; losing either from discovery + // would silently empty the guard. + assert.ok(files.has("insertion-normalization.mjs"), [...files].join(",")); + assert.ok(files.has("deferred-tool-rewrite.mjs"), [...files].join(",")); +}); + +test("BITE — a session key must separate CONVERSATIONS, not just system prompts", async () => { + for (const { file, name, fn } of await discoverKeyResolvers()) { + const a = callResolver(fn, { messages: convA, system: SYSTEM }); + const b = callResolver(fn, { messages: convB, system: SYSTEM }); + assert.notEqual( + a, + b, + `${file}:${name} gives one key to two conversations under the same session-id and system prompt — ` + + `the collision that cost cache in deferred-tool-rewrite. Add conversationSubKey from message-hash.mjs.`, + ); + } +}); + +test("a session key must separate SYSTEM PROMPTS (sidecar classes)", async () => { + for (const { file, name, fn } of await discoverKeyResolvers()) { + const main = callResolver(fn, { messages: convA, system: SYSTEM }); + const sidecar = callResolver(fn, { + messages: convA, + system: [{ type: "text", text: "Generate a concise 5-word title." }], + }); + assert.notEqual(main, sidecar, `${file}:${name} shares a key across system-prompt classes`); + } +}); + +test("a session key is STABLE for the same conversation as it grows", async () => { + // The other half: a key that changes every turn is not an identity either, + // and would abandon state on every request rather than colliding. + for (const { file, name, fn } of await discoverKeyResolvers()) { + const first = callResolver(fn, { messages: convA, system: SYSTEM }); + const grown = callResolver(fn, { + messages: [...convA, { role: "assistant", content: [{ type: "text", text: "reply" }] }], + system: SYSTEM, + }); + assert.equal(first, grown, `${file}:${name} changes key as the conversation grows — state cannot persist`); + } +}); + +// (A further case verifying prefix-diff's exemption from this invariant -- +// its own tenantId separation -- ships with the prefix-diff changes, which +// export the function it inspects.) diff --git a/test/shape-verdicts.test.mjs b/test/shape-verdicts.test.mjs new file mode 100644 index 00000000..cbca2904 --- /dev/null +++ b/test/shape-verdicts.test.mjs @@ -0,0 +1,254 @@ +// shape-verdicts — the fork's own judgment over its shape/baseline telemetry. +// +// These cases are ported from the dotfiles doctor's selftests, where this +// judgment briefly lived: the port is the proof that moving the logic across +// repos changed nothing about what fires and what stays quiet. The deployment +// side now only invokes the CLI and books the verdicts. + +import { test, beforeEach, afterEach } from "node:test"; +import assert from "node:assert/strict"; +import { writeFile, mkdir, mkdtemp, rm, utimes } from "node:fs/promises"; +import { tmpdir } from "node:os"; +import { join } from "node:path"; + +import { shapeWatchVerdict, baselineStepVerdict, computeVerdicts } from "../tools/shape-verdicts.mjs"; + +const shape = (over = {}) => ({ pairs: 300, thinkingDropPairs: 2, thinkingTextCompleted: 0, ...over }); +const ledger = (s) => ({ keys: { "s-a": { shape: s } } }); + +// Every test below runs against a scratch CLAUDE_CONFIG_DIR: the telemetry +// verdicts read real paths under claudeHome() (cache-fix-snapshots/, +// upstream-changes.jsonl, session-mirrors/), and without this the earlier, +// ledger-only tests would silently read whatever happens to be in the real +// ~/.claude on the machine running the suite. +let configDir; +let savedConfigDir; +const TELEMETRY_GATE_VARS = [ + "CACHE_FIX_OUTPUT_GUARD", + "CACHE_FIX_UPSTREAM_DETECTION", + "CACHE_FIX_UPSTREAM_DIR", + "CACHE_FIX_INSERTION_NORMALIZE", + "CACHE_FIX_TOOL_REWRITE", + "CACHE_FIX_SESSION_MIRROR", + "CACHE_FIX_SESSION_MIRROR_EVENT_LOG", +]; + +beforeEach(async () => { + configDir = await mkdtemp(join(tmpdir(), "shape-verdicts-config-")); + savedConfigDir = process.env.CLAUDE_CONFIG_DIR; + process.env.CLAUDE_CONFIG_DIR = configDir; + for (const v of TELEMETRY_GATE_VARS) delete process.env[v]; +}); + +afterEach(async () => { + if (savedConfigDir === undefined) delete process.env.CLAUDE_CONFIG_DIR; + else process.env.CLAUDE_CONFIG_DIR = savedConfigDir; + for (const v of TELEMETRY_GATE_VARS) delete process.env[v]; + await rm(configDir, { recursive: true, force: true }); +}); + +test("shape-watch: could-not-verify is warn with the inability named, never green", () => { + assert.equal(shapeWatchVerdict(null).level, "warn"); + assert.match(shapeWatchVerdict(null).message, /NOT currently watched/); + assert.equal(shapeWatchVerdict({ keys: {} }).level, "warn"); + assert.match(shapeWatchVerdict({ keys: { "s-a": { requests: 5 } } }).message, /run harvest/); +}); + +test("shape-watch: dormant classes read ok with the counts on display", () => { + const v = shapeWatchVerdict(ledger(shape())); + assert.equal(v.level, "ok"); + assert.match(v.message, /2\/300/); +}); + +test("BITE — reappeared completed-turn thinking warns with count and CC#69568", () => { + const v = shapeWatchVerdict(ledger(shape({ pairs: 10, thinkingTextCompleted: 7 }))); + assert.equal(v.level, "warn"); + assert.match(v.message, /69568/); + assert.match(v.message, /7 blocks/); +}); + +test("BITE — drop rate over 5% warns on a real sample; the same rate on a tiny sample is noise", () => { + assert.equal(shapeWatchVerdict(ledger(shape({ pairs: 100, thinkingDropPairs: 9 }))).level, "warn"); + assert.equal(shapeWatchVerdict(ledger(shape({ pairs: 10, thinkingDropPairs: 1 }))).level, "ok"); +}); + +test("baseline: three answers — missing working ledger warns, missing committed state is a named ok", () => { + assert.equal(baselineStepVerdict(null, null).level, "warn"); + const base = ledger(shape({ systemBytes: 20000, toolsBytes: 40000 })); + assert.equal(baselineStepVerdict(null, base).level, "ok"); + assert.match(baselineStepVerdict(null, base).message, /no committed comparison/); + assert.equal(baselineStepVerdict(base, base).level, "ok"); +}); + +test("BITE — the +94% class fires with numbers; shrinkage and floor stay quiet", () => { + const base = ledger(shape({ systemBytes: 20000, toolsBytes: 40000 })); + const grown = ledger(shape({ systemBytes: 38800, toolsBytes: 40000 })); + const v = baselineStepVerdict(base, grown); + assert.equal(v.level, "warn"); + assert.match(v.message, /20000->38800/); + assert.match(v.message, /committing the ledger acknowledges/); + assert.equal(baselineStepVerdict(base, ledger(shape({ systemBytes: 9000, toolsBytes: 40000 }))).level, "ok"); + assert.equal( + baselineStepVerdict(ledger(shape({ systemBytes: 100 })), ledger(shape({ systemBytes: 400 }))).level, + "ok", + ); +}); + +test("computeVerdicts: a missing ledger file yields both verdicts as honest warns, exit path intact", async () => { + const dir = await mkdtemp(join(tmpdir(), "shape-verdicts-")); + try { + const verdicts = await computeVerdicts(join(dir, "no-such-ledger.json")); + // 3 ledger-shape verdicts + the telemetry-consumer table (Q4). The + // table length is asserted against the TABLE, not a literal — a row + // legitimately added must not redden this test (the hardcoded-count + // anti-pattern bit exactly once, 2026-07-30). + const { TELEMETRY_CONSUMERS } = await import("../tools/shape-verdicts.mjs"); + assert.equal(verdicts.length, 3 + TELEMETRY_CONSUMERS.length); + assert.ok(verdicts.every((v) => v.level === "warn" || v.name === "baseline")); + assert.equal(verdicts[0].level, "warn", "shape-watch cannot read as green without a ledger"); + const telemetryNames = verdicts.slice(3).map((v) => v.name); + assert.deepEqual(telemetryNames, TELEMETRY_CONSUMERS.map((e) => e.name)); + } finally { + await rm(dir, { recursive: true, force: true }); + } +}); + +test("BITE — a stalled harvest timer cannot print dormant forever: frozen numbers warn", async () => { + const { HARVEST_MAX_AGE_H } = await import("../tools/shape-verdicts.mjs"); + const old = { keys: { "s-a": { lastHarvest: "2026-07-01T00:00:00Z", shape: shape() } } }; + const now = Date.parse("2026-07-29T00:00:00Z"); + const v = shapeWatchVerdict(old, now); + assert.equal(v.level, "warn"); + assert.match(v.message, /frozen/); + const fresh = { keys: { "s-a": { lastHarvest: new Date(now - 3600_000).toISOString(), shape: shape() } } }; + assert.equal(shapeWatchVerdict(fresh, now).level, "ok", `within ${HARVEST_MAX_AGE_H}h stays ok`); +}); + +test("retention: a NEW expired capture warns until the ledger commit acknowledges it", async () => { + const { retentionVerdict } = await import("../tools/shape-verdicts.mjs"); + assert.equal(retentionVerdict(null, null).level, "warn"); + const committed = { keys: { "s-old": { gone: true }, "s-b": {} } }; + const sameGone = { keys: { "s-old": { gone: true }, "s-b": {} } }; + assert.equal(retentionVerdict(committed, sameGone).level, "ok", "already-acknowledged gone stays quiet"); + const newGone = { keys: { "s-old": { gone: true }, "s-b": { gone: true } } }; + const v = retentionVerdict(committed, newGone); + assert.equal(v.level, "warn"); + assert.match(v.message, /s-b/); + assert.match(v.message, /CAPTURE_MAX_MB/); +}); + +// --- Telemetry-consumer table (Q4: alarm-without-reader gap) --- +// +// Every case below writes fixtures at the EXACT relative paths the real +// writers use (output-guard.mjs, upstream-change-detection.mjs, +// insertion-normalization.mjs, deferred-tool-rewrite.mjs, +// session-mirror-writer.mjs), under the scratch CLAUDE_CONFIG_DIR set in +// beforeEach — so a path drift in either the writer or this table's +// resolution would be caught, not just a drift in shape-verdicts alone. + +const oldMs = () => Date.now() - 48 * 3600_000; // outside HARVEST_MAX_AGE_H (26h) +const recentMs = () => Date.now() - 3600_000; // 1h ago, inside the window + +async function writeFixture(path, mtimeMs) { + await mkdir(path.slice(0, path.lastIndexOf("/")), { recursive: true }); + await writeFile(path, JSON.stringify({ ts: new Date(mtimeMs).toISOString() }) + "\n"); + const t = mtimeMs / 1000; + await utimes(path, t, t); +} + +test("BITE — telemetry alarm kind: a recent guard-events entry fires; an old one stays quiet", async () => { + const { telemetryConsumerVerdict } = await import("../tools/shape-verdicts.mjs"); + process.env.CACHE_FIX_OUTPUT_GUARD = "1"; + const entry = { + name: "telemetry-guard-events", + kind: "alarm", + maxAgeH: 26, + gate: () => process.env.CACHE_FIX_OUTPUT_GUARD === "1", + dir: () => join(configDir, "cache-fix-snapshots"), + suffix: "-guard-events.jsonl", + }; + const path = join(configDir, "cache-fix-snapshots", "s-abc123-guard-events.jsonl"); + await writeFixture(path, recentMs()); + const recent = await telemetryConsumerVerdict(entry); + assert.equal(recent.level, "warn", "a recent alarm entry IS the finding"); + assert.match(recent.message, /needs a look/); + + await writeFixture(path, oldMs()); + const old = await telemetryConsumerVerdict(entry); + assert.equal(old.level, "ok", "an alarm entry outside the window is dormant, not live"); +}); + +test("BITE — telemetry log kind: an old-mtime insertion-events file warns; a fresh one stays quiet", async () => { + const { telemetryConsumerVerdict } = await import("../tools/shape-verdicts.mjs"); + process.env.CACHE_FIX_INSERTION_NORMALIZE = "1"; + const entry = { + name: "telemetry-insertion-events", + kind: "log", + maxAgeH: 26, + gate: () => process.env.CACHE_FIX_INSERTION_NORMALIZE === "1", + dir: () => join(configDir, "cache-fix-snapshots"), + suffix: "-insertion-events.jsonl", + }; + const path = join(configDir, "cache-fix-snapshots", "s-xyz789-insertion-events.jsonl"); + await writeFixture(path, oldMs()); + const stale = await telemetryConsumerVerdict(entry); + assert.equal(stale.level, "warn", "gate on, no writes within maxAgeH — silence is the defect"); + assert.match(stale.message, /last write/); + + await writeFixture(path, recentMs()); + const fresh = await telemetryConsumerVerdict(entry); + assert.equal(fresh.level, "ok"); +}); + +test("BITE — telemetry could-not-verify: absent file never reads as a bare warn without the gate named", async () => { + const { telemetryConsumerVerdict } = await import("../tools/shape-verdicts.mjs"); + // Gate off, file absent (both entries): could-not-verify, message names the inability. + const alarmOff = { + name: "telemetry-upstream-changes", + kind: "alarm", + maxAgeH: 26, + gate: () => false, + file: () => join(configDir, "upstream-changes.jsonl"), + }; + const vAlarmOff = await telemetryConsumerVerdict(alarmOff); + assert.equal(vAlarmOff.level, "warn"); + assert.match(vAlarmOff.message, /gate is off/); + + const logOff = { + name: "telemetry-session-mirror", + kind: "log", + maxAgeH: 26, + gate: () => false, + file: () => join(configDir, "session-mirrors", "session-mirror-events.jsonl"), + }; + const vLogOff = await telemetryConsumerVerdict(logOff); + assert.equal(vLogOff.level, "warn"); + assert.match(vLogOff.message, /gate is off/); + + // Gate ON, file absent: alarm reads ok (no alarm ever fired); log warns + // (writes were expected and never happened) — never silently "ok" either. + const alarmOn = { ...alarmOff, gate: () => true }; + assert.equal((await telemetryConsumerVerdict(alarmOn)).level, "ok"); + const logOn = { ...logOff, gate: () => true }; + const vLogOn = await telemetryConsumerVerdict(logOn); + assert.equal(vLogOn.level, "warn"); + assert.match(vLogOn.message, /never been written/); +}); + +test("computeTelemetryVerdicts: names and order match the declared table, real writer paths", async () => { + const { computeTelemetryVerdicts } = await import("../tools/shape-verdicts.mjs"); + const verdicts = await computeTelemetryVerdicts(); + assert.deepEqual( + verdicts.map((v) => v.name), + [ + "telemetry-guard-events", + "telemetry-upstream-changes", + "telemetry-insertion-events", + "telemetry-deferred-tool-events", + "telemetry-session-mirror", + "telemetry-upstream-errors", + ], + ); + // Nothing gated on, nothing written: every entry is could-not-verify (warn). + assert.ok(verdicts.every((v) => v.level === "warn")); +}); diff --git a/tools/absence-scan.mjs b/tools/absence-scan.mjs new file mode 100755 index 00000000..85e1c642 --- /dev/null +++ b/tools/absence-scan.mjs @@ -0,0 +1,402 @@ +#!/usr/bin/env node +// absence-scan — the fixture hygiene classes, as an importable scanner and a +// CLI, so they can run where the exposure actually is. +// +// WHY THIS EXISTS AT ALL. The classes below were written as assertions inside +// test/harvest-scrub-relations.test.mjs §6 and fire at TEST time. The cost +// they guard against is paid at PUSH time: a harvested fixture carrying +// capture identifiers reached a public PR, and public git history cannot be +// scrubbed afterwards (the remediation for a leaked origin IP in a sibling +// repo was recreating the host). A check that only runs when someone runs the +// suite is not in front of that boundary. This file is the same check, made +// runnable by the pre-push hook the dotfiles repo deploys — the manual +// finding is the prototype, the mechanism is the deliverable +// (docs/dev-loop.md, "Adding a check"). +// +// WHAT IT IS NOT. This is an EXTRACTION, not a redesign. Every predicate here +// is the one §6 encoded on 2026-07-31; nothing was tightened and nothing was +// loosened. The classes' DEFINITION is +// docs/directives/fixture-sanitization-directive.md ("Threat model" + settled +// designs 2 and 5), restated in §6 and restated again here — deliberately not +// read back out of tools/harvest.mjs, because an expectation with the same +// parentage as the code pins the bug it should catch. +// +// FINDINGS NEVER ECHO THE MATCH. A leak reporter that prints the leak into a +// terminal, a CI log or a hook transcript has moved the leak, not found it. A +// finding carries the class, the file, the JSON path that reaches the string, +// and lengths. Never the bytes. +// +// THE THIRD ANSWER (docs/dev-loop.md, "A checker has THREE answers"): a file +// that does not parse is neither silently skipped nor silently passed — it is +// scanned as raw bytes (so the two byte-level classes still apply) and named +// on a `degraded:` line, so a run that could not fully verify says so. + +import { readFileSync } from "node:fs"; +import { execFileSync } from "node:child_process"; +import { basename } from "node:path"; + +// --- Allowlist --------------------------------------------------------------- +// +// Lives here rather than in either caller, so the test and the push hook +// cannot drift apart on what is accepted. +// +// LEDGER-*.json is the per-machine harvest watermark ledger: fork-only, never +// part of an upstream slice, and keyed by raw capture key BY DESIGN. That is a +// real residual (operator ruling 2026-07-31) and is named rather than left +// implicit. +export const ALLOWLIST = [ + /(^|\/)test\/fixtures\/harvested\/LEDGER-[^/]*\.json$/, + // Upstream's own transcript-shape fixture: committed upstream with that + // machine's identifiers, public in the upstream tree before this scan + // existed. A NEW-branch push scans EMPTY..tip and would go red forever on + // content this repo cannot change — so the pre-existing third-party file + // is a declared exemption here (the pre-push guard's documented remedy), + // never a softened predicate. + /(^|\/)test\/fixtures\/cc-transcript-shape-snapshot\.json$/, +]; + +export function isAllowlisted(path) { + const p = String(path).replace(/\\/g, "/"); + return ALLOWLIST.some((re) => re.test(p)); +} + +// --- Scope ------------------------------------------------------------------- +// +// §6 states its scope in the same breath as its classes: "every committed +// fixture under test/fixtures/harvested". That scope is part of the +// DEFINITION, not an implementation detail of the test, and carrying it over +// is what keeps the classes honest — three of the five say what a SANITIZED +// HARVEST looks like, and a hand-authored proxy fixture is not one. +// +// Measured 2026-08-01, all five classes over every tracked *.json/*.jsonl in +// this repo (`node tools/absence-scan.mjs $(git ls-files '*.json' '*.jsonl')` +// before this scoping existed): 219 findings, of which ~205 were synthetic +// hand-authored test data — English prose in `text` fields, `ts` fields +// written by hand, a 4-character `source.data` placeholder. A guard that fires +// on those fires on every push and trains the --no-verify reflex that kills +// it (docs/dev-loop.md: "a check that fires on a non-defect is also broken"). +// +// The two BYTE-level classes are not scoped, because they need no corpus to be +// true: a 200-character base64 run and an 8-4-4-4-12 UUID are a payload and a +// live capture identifier wherever they sit. Their measured false-fire rate +// over the same sweep was zero, and their true positives were real. +export const CORPUS_SCOPE = /(^|\/)test\/fixtures\/harvested\//; +export const inCorpus = (file) => CORPUS_SCOPE.test(String(file).replace(/\\/g, "/")); + +// --- The class definitions --------------------------------------------------- + +// (a) An image payload, a thinking signature or an encoded blob looks like a +// long run of the base64 alphabet. 200 characters is the threshold §6 set. +export const B64_RUN = /[A-Za-z0-9+/]{201,}/; +// (d) A capture identifier. Session keys and sids appear only as `s-` +// tokens, which carry no dashes and so cannot satisfy this shape. +export const UUID = /[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/i; +// (d) …and a filename is as public as the content it names. The capture-derived +// name carries `s-`: 12 hex, never 8, so a name can never be matched +// back to a session by prefix. +export const NAME_UUID_PREFIX = /(^|[^0-9a-f])s-[0-9a-f]{8}(?![0-9a-f])/; +// (c) A whole-string ISO-8601 instant. Deliberately whole-string: a date inside +// authored prose (a fixture's own "measured on …" provenance note, a growth +// artifact's filename) is documentation the artifact exists to carry. +export const ISO_INSTANT = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}:\d{2})$/; +export const EPOCH_START = Date.parse("2000-01-01T00:00:00.000Z"); +export const EPOCH_END = Date.parse("2001-01-01T00:00:00.000Z"); +// (b) A nested wire payload, tokenized. +export const DATA_TOKEN = /^data_[0-9a-f]{10}$/; +// (e) A tokenized text: `t__` per "\n\n" segment, +// with a wrapper surviving verbatim around a tokenized +// inner text. +export const TOKEN = /^t_[0-9a-f]{12}_[0-9]+$/; +export const WRAP = /^\n([\s\S]*)\n<\/system-reminder>\s*$/; +export const CONTENT_KEYS = new Set(["text", "thinking", "content"]); + +export const wellFormed = (scrubbed) => + scrubbed.split("\n\n").every((seg) => seg === "" || TOKEN.test(seg)); + +// Every string VALUE in a document, with the path that reaches it, plus the +// object that owns it — the scan has to see structure (`source.data`) as well +// as bytes. +export function* strings(node, path = "$") { + if (typeof node === "string") return yield { path, value: node, owner: null }; + if (Array.isArray(node)) { + for (let i = 0; i < node.length; i++) yield* strings(node[i], `${path}[${i}]`); + return; + } + if (node && typeof node === "object") { + for (const [k, v] of Object.entries(node)) { + if (typeof v === "string") yield { path: `${path}.${k}`, value: v, owner: node, key: k }; + else yield* strings(v, `${path}.${k}`); + } + } +} + +// `applies` is the class's DOMAIN — how many strings it had an opinion about. +// A caller that wants to know the scan was not vacuous reads the per-class +// counter, which is why the domain is not folded into `violates`. +// `scope`: "any" = true of any committed JSON, "corpus" = defined over the +// sanitized harvested fixture corpus only (see CORPUS_SCOPE above). +export const CLASSES = [ + { + name: "b64-run", + scope: "any", + why: "a base64 run longer than 200 characters is an unsanitized payload", + applies: () => true, + violates: ({ value }) => { + const m = B64_RUN.exec(value); + return m ? { run: m[0].length } : null; + }, + }, + { + name: "nested-payload", + scope: "corpus", + why: "a raw source.data is the measured 2026-07-31 image gap", + applies: ({ key, owner, path }) => key === "data" && !!owner && path.endsWith(".source.data"), + violates: ({ value }) => (DATA_TOKEN.test(value) ? null : {}), + }, + { + name: "live-timestamp", + scope: "corpus", + why: "a live wall-clock timestamp survived the rebase onto the fixed epoch", + applies: ({ value }) => ISO_INSTANT.test(value), + violates: ({ value }) => { + const t = Date.parse(value); + return t >= EPOCH_START && t < EPOCH_END ? null : {}; + }, + }, + { + name: "capture-uuid", + scope: "any", + why: "a session UUID is a live capture identifier", + applies: () => true, + violates: ({ value }) => (UUID.test(value) ? {} : null), + }, + { + name: "raw-content", + scope: "corpus", + why: "raw capture prose in a public-repo fixture", + // Two accepted non-token literals, both content-free by construction: + // "REDACTED" (tool-input key shapes, and the pre-2026-07-30 fixed-constant + // reminder scrub still present in the legacy harvested-*.jsonl fixtures) + // and the empty string. + applies: ({ key, value }) => CONTENT_KEYS.has(key) && value !== "" && value !== "REDACTED", + violates: ({ value }) => { + const inner = WRAP.exec(value)?.[1] ?? value; + if (inner === "REDACTED") return null; + return wellFormed(inner) ? null : {}; + }, + }, +]; + +export const CLASS_NAMES = CLASSES.map((c) => c.name); +const zeroSeen = () => Object.fromEntries(CLASS_NAMES.map((n) => [n, 0])); + +/** The classes a given path is in scope for. */ +export const classesFor = (file) => (inCorpus(file) ? CLASSES : CLASSES.filter((c) => c.scope === "any")); + +/** + * Scan one parsed document (or a bare string, for the raw-byte fallback). + * Returns { findings, seen, scanned } — findings carry class, path and + * lengths, never the matched bytes. + * + * ALL classes by default: a caller holding a document already knows what it + * is. Path-driven scoping is the job of scanContent, which has a path. + */ +export function scanDocument(doc, { file = "", path = "$", classes = CLASSES } = {}) { + const findings = []; + const seen = zeroSeen(); + let scanned = 0; + for (const entry of strings(doc, path)) { + scanned++; + for (const cls of classes) { + if (!cls.applies(entry)) continue; + seen[cls.name]++; + const detail = cls.violates(entry); + if (detail) { + findings.push({ class: cls.name, file, path: entry.path, length: entry.value.length, ...detail }); + } + } + } + return { findings, seen, scanned }; +} + +/** The filename class (d, second half). Names, not contents. */ +export function scanName(file) { + const name = basename(String(file)); + if (UUID.test(name) || NAME_UUID_PREFIX.test(name)) { + return [{ class: "capture-uuid-filename", file, path: "", length: name.length }]; + } + return []; +} + +/** + * Scan file CONTENT already in hand (a blob out of git, a fixture read from + * disk). `.jsonl` is split per line; a unit that does not parse is scanned as + * raw bytes and named on the returned `degraded` list — never skipped. + */ +export function scanContent(text, file) { + const findings = [...scanName(file)]; + const seen = zeroSeen(); + const degraded = []; + const classes = classesFor(file); + let scanned = 0; + const isJsonl = /\.jsonl$/i.test(file); + const units = isJsonl ? text.split("\n").filter((l) => l.trim()) : [text]; + units.forEach((unit, i) => { + let doc; + try { + doc = JSON.parse(unit); + } catch { + // Fail closed: the bytes still get the two byte-level classes. + degraded.push(isJsonl ? `line ${i + 1} does not parse` : "does not parse"); + doc = unit; + } + const r = scanDocument(doc, { file, path: isJsonl ? `$[${i}]` : "$", classes }); + findings.push(...r.findings); + for (const n of CLASS_NAMES) seen[n] += r.seen[n]; + scanned += r.scanned; + }); + return { findings, seen, scanned, degraded, partial: !inCorpus(file) }; +} + +/** Scan a file from disk. */ +export function scanFile(file) { + return scanContent(readFileSync(file, "utf-8"), file); +} + +// --- git range mode ---------------------------------------------------------- + +const SCANNABLE = /\.jsonl?$/i; + +function git(args) { + return execFileSync("git", args, { encoding: "utf-8", maxBuffer: 1 << 28 }); +} + +function rangeFiles(oldRef, newRef) { + const out = + oldRef === "EMPTY" + ? git(["ls-tree", "-r", "--name-only", newRef]) + : git(["diff", "--name-only", "--diff-filter=ACMR", oldRef, newRef]); + return out.split("\n").map((l) => l.trim()).filter((l) => l && SCANNABLE.test(l)); +} + +/** + * Files added or modified between two refs, with their content at `newRef`. + * `oldRef === "EMPTY"` means every file reachable at `newRef` — the new-branch + * push, where there is no remote side to diff against. + * + * An `oldRef` git cannot resolve (a remote sha this clone never fetched) + * degrades to EMPTY rather than erroring: scanning everything is the + * fail-closed answer, and it is named on a `degraded:` line. + */ +export function scanGitRange(oldRef, newRef) { + const degraded = []; + let from = oldRef; + if (from !== "EMPTY") { + try { + git(["cat-file", "-e", `${from}^{commit}`]); + } catch { + degraded.push(`base ref ${from} is not resolvable here — scanning everything at ${newRef}`); + from = "EMPTY"; + } + } + const files = rangeFiles(from, newRef); + const findings = []; + const allowlisted = []; + const seen = zeroSeen(); + let scanned = 0; + let partial = 0; + for (const file of files) { + if (isAllowlisted(file)) { + allowlisted.push(file); + continue; + } + const text = git(["show", `${newRef}:${file}`]); + const r = scanContent(text, file); + findings.push(...r.findings); + for (const n of CLASS_NAMES) seen[n] += r.seen[n]; + scanned += r.scanned; + if (r.partial) partial++; + degraded.push(...r.degraded.map((d) => `${file}: ${d}`)); + } + return { findings, seen, scanned, degraded, allowlisted, files, partial }; +} + +// --- CLI --------------------------------------------------------------------- + +const USAGE = `usage: + node tools/absence-scan.mjs + node tools/absence-scan.mjs --git-range .. (from a repo root; may be EMPTY) + +exit 0 = clean, 2 = findings, 1 = internal error`; + +function report(out, { findings, allowlisted = [], degraded = [], partial = 0 }) { + for (const p of allowlisted) out(`allowlisted: ${p}`); + for (const d of degraded) out(`degraded: ${d}`); + // Never silence about what was only half-checked (docs/dev-loop.md, "A + // checker has THREE answers"). + if (partial) { + out(`scope: ${partial} file(s) outside test/fixtures/harvested/ — byte-level classes only ` + + `(${CLASSES.filter((c) => c.scope === "any").map((c) => c.name).join(", ")})`); + } + for (const f of findings) { + const extra = f.run ? ` run=${f.run}` : ""; + out(`FINDING ${f.class} ${f.file || ""} ${f.path} (${f.length} chars${extra})`); + } +} + +function main(argv) { + const args = argv.slice(2); + if (args.length === 0 || args.includes("--help") || args.includes("-h")) { + process.stdout.write(`${USAGE}\n`); + return args.length === 0 ? 1 : 0; + } + const out = (s) => process.stdout.write(`${s}\n`); + let result; + if (args[0] === "--git-range") { + const range = args[1]; + if (!range || !range.includes("..")) { + process.stderr.write(`absence-scan: --git-range needs ..\n${USAGE}\n`); + return 1; + } + const [oldRef, newRef] = range.split(".."); + if (!newRef) { + process.stderr.write("absence-scan: --git-range needs ..\n"); + return 1; + } + result = scanGitRange(oldRef, newRef); + } else { + const findings = []; + const allowlisted = []; + const degraded = []; + let partial = 0; + for (const file of args) { + if (isAllowlisted(file)) { + allowlisted.push(file); + continue; + } + const r = scanFile(file); + findings.push(...r.findings); + if (r.partial) partial++; + degraded.push(...r.degraded.map((d) => `${file}: ${d}`)); + } + result = { findings, allowlisted, degraded, partial }; + } + report(out, result); + if (result.findings.length) { + out(`absence-scan: ${result.findings.length} finding(s) — these bytes must not reach a public history.`); + return 2; + } + out("absence-scan: clean"); + return 0; +} + +if (import.meta.url === `file://${process.argv[1]}`) { + let code; + try { + code = main(process.argv); + } catch (err) { + process.stderr.write(`absence-scan: internal error — ${err?.message ?? err}\n`); + code = 1; + } + process.exit(code); +} diff --git a/tools/bust-triage.mjs b/tools/bust-triage.mjs new file mode 100755 index 00000000..10e4b8bc --- /dev/null +++ b/tools/bust-triage.mjs @@ -0,0 +1,362 @@ +#!/usr/bin/env node +// bust-triage — one command from an observed cache bust to a classified verdict. +// +// Why this exists: on 2026-07-31 a single bust took a six-step hand +// investigation — statusline, worktime ledger, CC transcript, proxy journal, +// capture pair, body diff — before `replay --census` could even be pointed at +// it. Two of the day's most valuable findings came out of steps nobody repeats +// under time pressure, and one of them (an entirely uncovered bust class) was +// found only because a diff happened to be read. The manual pass finds a defect +// once; the mechanism finds it at the moment it occurs, without the reasoning +// that produced it — and that reasoning is exactly what does not survive into +// the next session. +// +// It CHAINS existing tools rather than reimplementing them (dev-loop.md, +// "Never hand-roll identity in a probe"): classification comes from +// replay.mjs's censusPair, the migration byte-test from +// reminder-migration-census.mjs, conversation grouping from the shared +// identity. The only logic new here is the ledger/transcript reconciliation +// and the matrix lookup. +// +// Usage: +// node tools/bust-triage.mjs # newest bust in the ledger +// node tools/bust-triage.mjs --at 1785498086 # a specific one (epoch or ISO) +// node tools/bust-triage.mjs --list # recent ❄ events, newest first +// # (busts AND controlled costs) +// ... --json +// +// THREE answers, never two (dev-loop.md, "A checker has THREE answers"): +// MITIGATED known class, shipped extension, absorbed as designed +// KNOWN-OPEN known class, matrix row N, still open — prints the status +// UNCLASSIFIED no matrix row matches. THE payload of this tool: an +// unrecognised class is the one thing no existing check +// reports, and it is how a whole bust class stayed invisible. +// A step that cannot run says so and does not fold into a pass. + +import { readFileSync, existsSync, readdirSync } from "node:fs"; +import { homedir } from "node:os"; +import { join } from "node:path"; +import { censusPair } from "./replay.mjs"; +import { canonical, classify, reminderBlocks, textOf } from "./reminder-migration-census.mjs"; + +const LEDGER = join(homedir(), ".local/share/claude-worktime/activity.jsonl"); +const CAPTURES = join(homedir(), ".claude/cache-fix-captures"); +const PROJECTS = join(homedir(), ".claude/projects"); +const MATRIX = "docs/directives/robustness-threat-matrix.md"; + +const j = (line) => { try { return JSON.parse(line); } catch { return null; } }; +const lines = (p) => (existsSync(p) ? readFileSync(p, "utf8").split("\n").filter(Boolean) : []); + +// The ❄-visible cold classes, and the definition is the statusline's own. +// `claude-worktime` advances the ❄ token on two paths — `cold_hit` (k:"hit") +// and `cold_cost` (k:"cost", plus legacy k:"resume" records) — and its +// `--cold --all` filter is written exactly that way. This tool read only +// k:"hit", so on 2026-07-31 the statusline showed `❄ 55k compact (8m)` while +// `--list` showed nothing newer than 90 minutes earlier and the default run +// silently triaged an older, unrelated event. An event the operator can SEE +// must never be missing from the tool that explains events. +const CONTROLLED = new Set(["cost", "resume"]); + +/** + * Every ❄-visible cold event, newest first, retractions and cause upgrades + * applied. `cls` splits them: "bust" is a preventable cache loss, "controlled" + * is a cost the operator (or the auto-compact ceiling) caused — real, visible, + * and NOT triageable, which is an answer rather than a reason to hide it. + */ +export function coldEvents(ledgerPath = LEDGER) { + const recs = lines(ledgerPath).map(j).filter((r) => r && r.type === "cold"); + const retracted = new Set( + recs.filter((r) => r.k === "hit-retract").map((r) => `${r.s}#${r.hit_t}`)); + // A k:"hit-cause" marker carries the cause recovered after a raced read; + // honoring it here is why this tool and `--cold` cannot disagree. + const causeFix = new Map( + recs.filter((r) => r.k === "hit-cause").map((r) => [`${r.s}#${r.hit_t}`, r.cause])); + return recs + .filter((r) => (r.k === "hit" || CONTROLLED.has(r.k)) && !retracted.has(`${r.s}#${r.t}`)) + .map((r) => ({ ...r, cls: r.k === "hit" ? "bust" : "controlled", + cause: causeFix.get(`${r.s}#${r.t}`) ?? r.cause })) + .sort((x, y) => y.t - x.t); +} + +/** Cold HIT records only — the population that can actually be triaged. */ +export function busts(ledgerPath = LEDGER) { + return coldEvents(ledgerPath).filter((e) => e.cls === "bust"); +} + +/** The transcript's own diagnostic for a bust, or null when unreadable. */ +export function transcriptCause(sid, cc) { + if (!existsSync(PROJECTS)) return null; + for (const proj of readdirSync(PROJECTS)) { + const f = join(PROJECTS, proj, `${sid}.jsonl`); + if (!existsSync(f)) continue; + for (const line of lines(f)) { + const r = j(line); + const d = r?.message?.diagnostics?.cache_miss_reason; + if (!d) continue; + if ((r.message?.usage?.cache_creation_input_tokens ?? -1) === cc) { + return { type: d.type, missed: d.cache_missed_input_tokens ?? null }; + } + } + } + return null; +} + +/** The capture request pair straddling a bust, by conversation. */ +export function capturePair(sid, tsEpoch) { + const f = join(CAPTURES, `s-${sid}-requests.jsonl`); + if (!existsSync(f)) return null; + const recs = lines(f).map(j).filter((r) => r?.body?.messages && r?.ts); + if (recs.length < 2) return null; + // The busting request is the newest one at or before the ledger stamp; its + // predecessor IN THE SAME CONVERSATION is the comparison. Conversation, not + // adjacency — interleaved tenants sit several lines apart. + // STRICTLY at or before the ledger stamp: worktime books the hit from the + // statusline hook, which runs AFTER the response, so the busting request + // always precedes the stamp. An earlier version allowed +30s of slack and + // selected a request 35s LATER than the bust — an append-only pair that + // classified as UNCLASSIFIED and would have been reported as a new class. + // ...and it must be a request that could PRODUCE this bust. One session id + // covers several conversations (main thread, subagents, the 1-message + // bootstrap/sidecar calls), and the newest request before the stamp is + // frequently a sidecar. Selecting one made a 44k rewrite classify as + // "identical" on an n=1->n=1 pair and report a phantom new class. The + // context the bust re-wrote is the discriminator: require a body at least + // as large as the ledger's own ctx figure allows, floored at 2 messages + // since a single-message request has no prefix to bust. + const cutoff = tsEpoch * 1000; + const plausible = (r) => (r.body.messages?.length ?? 0) >= 2; + let after = null; + for (const r of recs) { + const t = Date.parse(r.ts); + if (t <= cutoff && plausible(r) && (!after || t > Date.parse(after.ts))) after = r; + } + if (!after) return null; + const cid = JSON.stringify(after.body.messages[0]); + let before = null; + for (const r of recs) { + if (r === after) continue; + if (JSON.stringify(r.body.messages[0]) !== cid) continue; + if (Date.parse(r.ts) >= Date.parse(after.ts)) continue; + if (!before || Date.parse(r.ts) > Date.parse(before.ts)) before = r; + } + return before ? { before, after } : null; +} + +/** Does the pair carry the row-4 reminder container migration? */ +export function migrationVerdict(pair) { + const b = pair.before.body.messages, a = pair.after.body.messages; + const inlineAfter = new Set(); + for (const m of a) for (const t of reminderBlocks(m)) inlineAfter.add(t); + const sysAfter = a.filter((m) => m?.role === "system").map(textOf); + for (let i = 0; i < b.length; i++) { + const blocks = reminderBlocks(b[i]); + if (!blocks.length || blocks.some((t) => inlineAfter.has(t))) continue; + const recon = canonical(blocks); + for (const t of sysAfter) { + const v = classify(recon, t); + if (v === "EXACT" || v === "EXTENDED") return { host: i, verdict: v }; + } + return { host: i, verdict: "DROPPED" }; + } + return null; +} + +/** Matrix rows whose status line we can quote, keyed by the classes we map to. */ +export function matrixRow(n) { + if (!existsSync(MATRIX)) return null; + for (const line of lines(MATRIX)) { + const m = /^\|\s*(\d+)\s*\|/.exec(line); + if (m && Number(m[1]) === n) { + const cells = line.split("|"); + const status = (cells[cells.length - 2] ?? "").trim(); + return { n, status: status.slice(0, 260), open: /\bOPEN\b|RE-OPENED/.test(status) }; + } + } + return null; +} + +/** + * Map an observed shape to a matrix row. Returns null for "no row matches", + * which is the UNCLASSIFIED verdict — deliberately NOT a default row. + */ +export function classToRow(censusClass, migration) { + if (migration) return 4; // container migration + if (censusClass === "splice/insert-mid") return 1; + if (censusClass === "replace/edit") return 4; + return null; +} + +export function triage(bust) { + const steps = []; + const tc = transcriptCause(bust.s, bust.cc); + steps.push(tc + ? { step: "transcript", ok: true, detail: `${tc.type}${tc.missed ? ` / ${tc.missed}` : ""}` } + : { step: "transcript", ok: false, detail: "no diagnostic found (older CC, or transcript rotated)" }); + + // Reconciliation: the ledger and the transcript must agree. They disagreed + // live on 2026-07-31 (display upgraded, record left "other") and the + // divergence was invisible until compared. + if (tc && bust.cause && bust.cause !== "other" && bust.cause !== tc.type) { + steps.push({ step: "reconcile", ok: false, + detail: `LEDGER says "${bust.cause}", TRANSCRIPT says "${tc.type}" — instrument disagreement` }); + } else if (tc && bust.cause === "other") { + steps.push({ step: "reconcile", ok: false, + detail: `ledger still "other" while transcript has "${tc.type}" — raced read never upgraded` }); + } else if (tc) { + steps.push({ step: "reconcile", ok: true, detail: "ledger and transcript agree" }); + } + + const pair = capturePair(bust.s, bust.t); + if (!pair) { + steps.push({ step: "capture", ok: false, detail: "no capture pair (capture off, or rotated)" }); + return { bust, steps, verdict: "UNVERIFIABLE", why: "no capture pair to classify" }; + } + steps.push({ step: "capture", ok: true, + detail: `${pair.before.ts} -> ${pair.after.ts}, n=${pair.before.body.messages.length}->${pair.after.body.messages.length}` }); + + const cls = censusPair(pair.before.body.messages, pair.after.body.messages); + steps.push({ step: "census", ok: true, detail: cls }); + + const mig = migrationVerdict(pair); + steps.push(mig + ? { step: "migration", ok: true, detail: `row-4 container migration at host ${mig.host} (${mig.verdict})` } + : { step: "migration", ok: true, detail: "no reminder container migration in this pair" }); + + const rowN = classToRow(cls, mig); + if (rowN === null) { + return { bust, steps, verdict: "UNCLASSIFIED", + why: `census class "${cls}" maps to no threat-matrix row — a class nothing currently covers` }; + } + const row = matrixRow(rowN); + if (!row) { + return { bust, steps, verdict: "UNCLASSIFIED", + why: `mapped to matrix row ${rowN}, but that row could not be read` }; + } + return { + bust, steps, + verdict: row.open ? "KNOWN-OPEN" : "MITIGATED", + why: `matrix row ${rowN}: ${row.status}`, + }; +} + +function fmt(t) { return new Date(t * 1000).toISOString().replace("T", " ").slice(0, 19); } + +/** `--list` rows: every ❄-visible event, controlled ones labelled as such. */ +export function listRows(events) { + return events.map((e) => { + const label = e.cls === "controlled" ? `CONTROLLED(${e.cause ?? "-"})` : (e.cause ?? "-"); + return ` ${fmt(e.t)} ${String(Math.round((e.cc ?? 0) / 1000)).padStart(4)}k ` + + `${label.padEnd(30)} ${e.s.slice(0, 8)}`; + }); +} + +/** + * What the default (no-args) run must say when the NEWEST cold event is not + * the one it is about to triage. Silence here is the defect: the operator sees + * a ❄ token, runs the tool, and gets a verdict about a different, older event + * with nothing marking the substitution. + */ +export function fallbackNote(events) { + const newest = events[0]; + if (!newest || newest.cls !== "controlled") return []; + const bust = events.find((e) => e.cls === "bust"); + const head = + ` NOTE the newest cold event is ${fmt(newest.t)} ` + + `CONTROLLED(${newest.cause ?? "-"}), ${Math.round((newest.cc ?? 0) / 1000)}k re-written.\n` + + " Cannot triage: a controlled cause (compact/resume) is a cost you\n" + + " caused, not a bust — there is no prevented-loss verdict to give."; + return [head, bust + ? ` Falling back to the newest BUST: ${fmt(bust.t)} (${(bust.cause ?? "-")}).` + : " No bust in the ledger to fall back to."]; +} + +function main(argv) { + const args = argv.slice(2); + const json = args.includes("--json"); + const events = coldEvents(); + const all = events.filter((e) => e.cls === "bust"); + if (args.includes("--list")) { + if (!events.length) { + process.stdout.write("no cold events in the worktime ledger.\n"); + return 0; + } + for (const row of listRows(events.slice(0, 15))) process.stdout.write(row + "\n"); + return 0; + } + const note = fallbackNote(events); + if (!all.length) { + // "no busts" and "nothing happened" are different statements, and the + // controlled events are exactly what distinguishes them. + for (const line of note) process.stdout.write(line + "\n"); + process.stdout.write("no cold-cache BUSTS in the worktime ledger.\n"); + return 0; + } + const atI = args.indexOf("--at"); + const explicit = atI >= 0; + let bust = all[0]; + if (explicit) { + const raw = args[atI + 1] ?? ""; + const want = /^\d+$/.test(raw) ? Number(raw) : Math.floor(Date.parse(raw) / 1000); + bust = all.reduce((best, b) => + Math.abs(b.t - want) < Math.abs(best.t - want) ? b : best, all[0]); + } + const r = triage(bust); + if (json) { + // `newest` rides the JSON so a consumer can see the substitution too — the + // whole failure was that it happened invisibly. + process.stdout.write(JSON.stringify( + { ...r, newest: events[0] ?? null, fellBack: !explicit && note.length > 0 }, null, 2) + "\n"); + return 0; + } + + if (!explicit && note.length) process.stdout.write("\n" + note.join("\n") + "\n"); + process.stdout.write(`\nbust-triage — ${fmt(bust.t)} ${Math.round(bust.cc / 1000)}k re-written session ${bust.s.slice(0, 8)}\n\n`); + for (const s of r.steps) { + process.stdout.write(` ${s.ok ? "OK " : "WARN"} ${s.step.padEnd(11)} ${s.detail}\n`); + } + process.stdout.write(`\n VERDICT: ${r.verdict}\n ${r.why}\n`); + if (r.verdict === "UNCLASSIFIED") { + process.stdout.write( + "\n An unclassified bust is a NEW CLASS until shown otherwise. Book it as a\n" + + " threat-matrix row before it is explained away — the matrix records, the\n" + + " gate enforces, and a class with no row is a class nothing watches.\n"); + } + process.stdout.write("\n"); + return 0; +} + +if (process.argv[1] && import.meta.url === `file://${process.argv[1]}`) { + if (process.argv.includes("--selftest")) { + const eq = (a, b, m) => { if (a !== b) throw new Error(`${m}: ${JSON.stringify(a)} != ${JSON.stringify(b)}`); }; + // classToRow must NOT invent a row — an unknown class stays unclassified, + // which is the whole point of the third answer. + eq(classToRow("append-only", null), null, "append-only maps nowhere"); + eq(classToRow("identical", null), null, "identical maps nowhere"); + eq(classToRow("reorder-only", null), null, "unknown class stays unclassified"); + eq(classToRow("splice/insert-mid", null), 1, "splice -> row 1"); + eq(classToRow("replace/edit", null), 4, "replace/edit -> row 4"); + eq(classToRow("append-only", { host: 3, verdict: "EXACT" }), 4, "migration wins -> row 4"); + // retraction + cause-upgrade handling, on a synthetic ledger + const { writeFileSync, mkdtempSync } = await import("node:fs"); + const { tmpdir } = await import("node:os"); + const d = mkdtempSync(join(tmpdir(), "bt-")); + const p = join(d, "a.jsonl"); + writeFileSync(p, [ + JSON.stringify({ type: "cold", k: "hit", t: 100, s: "S", cc: 1000, cause: "other" }), + JSON.stringify({ type: "cold", k: "hit-cause", hit_t: 100, s: "S", cause: "messages_changed" }), + JSON.stringify({ type: "cold", k: "hit", t: 200, s: "S", cc: 2000, cause: "idle" }), + JSON.stringify({ type: "cold", k: "hit-retract", hit_t: 200, s: "S" }), + ].join("\n") + "\n"); + const got = busts(p); + eq(got.length, 1, "retracted hit must not be listed"); + eq(got[0].t, 100, "surviving hit"); + eq(got[0].cause, "messages_changed", "hit-cause marker must upgrade the cause"); + // matrixRow reads a real row and detects OPEN + const r4 = matrixRow(4); + eq(r4 !== null, true, "row 4 readable"); + eq(r4.open, true, "row 4 is currently OPEN (re-opened 2026-07-31)"); + process.stdout.write("bust-triage: selftest passed\n"); + process.exit(0); + } + process.exit(main(process.argv)); +} diff --git a/tools/cache-sim.mjs b/tools/cache-sim.mjs new file mode 100644 index 00000000..2db521c9 --- /dev/null +++ b/tools/cache-sim.mjs @@ -0,0 +1,307 @@ +#!/usr/bin/env node +// cache-sim — model the API's prefix cache over a captured request +// corpus. Directive: docs/directives/proxy-request-capture-replay.md +// (stage 3). +// +// Usage: +// node tools/cache-sim.mjs [--json] +// +// For each consecutive same-key pair of requests, computes the longest +// byte-identical prefix (params/system/tools gate the whole prefix, then +// messages element-wise) and prices the request against the cache_control +// markers present in the PREVIOUS request: the hit is the highest marker +// whose covered prefix survived; everything past it is re-written at the +// write premium. +// +// Token counts are chars/4 approximations. The tool's job is RELATIVE +// comparison — same corpus, pipeline-variant A vs B — and flagging the +// same events the worktime cold ledger flags (its calibration check), +// not exact token accounting. +// +// --- Price what we SEND, not what CC wrote (--pipeline) --- +// +// Run against raw captures this tool answers a question nobody asked: what +// CC's own bytes would have cost with no proxy in front of them. The API sees +// the POST-pipeline body, so that is what has to be priced — and the gap is +// not cosmetic. Measured 2026-07-28 on raw captures: `bestMarker=-1` on every +// pair, because marker placement is a pipeline concern, so every pair scored +// as a full-context bust and the totals were meaningless. Two of today's +// findings (the ladder manufacturing busts, the pin removing them) are +// invisible without pricing the forwarded bytes. +// +// KNOWN MODEL LIMITATION — the bust COUNT is inflated; A/B deltas are sound. +// +// The model gives each request exactly one predecessor's markers to resume +// from. The real API keeps every cache entry written in the last TTL window, +// so a divergence at message 83 can still hit an entry written five requests +// ago at message 80. Modelling one-request memory, this tool calls that a full +// bust; the API charges almost nothing. +// +// The scale, measured 2026-07-28 on a 602-request capture: 382 of 545 pairs +// resolve to a marker hit, and of the 158 flagged busts 153 are mid-history +// divergences with bestMarker=-1 — i.e. a marker existed, just not in the +// single request this model consults. The same session's real transcript shows +// cache_read climbing steadily through most of them. +// +// So: use A/B DELTAS on one corpus (same bias both sides, it cancels), which +// is what the tool exists for. Do NOT quote the bust count or the absolute +// totals as fact. Fixing it means modelling multi-entry cache retention with a +// TTL — real work, not a patch, and deliberately not done here. +// +// The correctness verdict lives in replay.mjs's gates; cache-sim only ever +// prices what those gates let through. +// +// --pipeline loads the real extension pipeline exactly as replay.mjs does, +// against a scratch state dir, and prices the forwarded bodies. Combined with +// --env it answers "what did this flag change, in tokens" — the number the +// stability gate deliberately does NOT provide, because a green gate is a +// correctness verdict and tokens are the cost of whatever it lets through. +// +// Streamed, never readFile: a capture re-sends the whole conversation per +// request, so it grows quadratically and a single live session reached 555 MB +// here — past Node's ~512 MB max string length, which threw outright on the +// very traffic this tool exists to price. + +import { mkdtemp, rm } from "node:fs/promises"; +import { tmpdir } from "node:os"; +import { join, dirname } from "node:path"; +import { fileURLToPath } from "node:url"; +import { createHash } from "node:crypto"; + +import { readLines } from "./read-lines.mjs"; + +const CHARS_PER_TOKEN = 4; + +// A conversation is identified by its first message: co-tenant traffic shares +// the session-id header (and therefore the capture key) but never msgs[0]. +// +// FULL content hash, never a truncated prefix. The first version sliced +// msgs[0] to 200 chars, and short sidecar calls share their opening far past +// that — measured on a 602-request capture: 3 buckets held more than one +// conversation, the worst holding 7, so those pairs priced as full busts and +// the totals were unusable. The live path (insertion-normalization's +// conversationSubKey) hashes the whole first message and collides 0 times on +// the same corpus; this now matches it. +// +// Fourth instance of one root shape in a single day: an identity computed more +// cheaply than the thing it identifies WILL collide, and the collision +// presents as churn rather than as a bug. +function conversationId(msgs) { + if (!Array.isArray(msgs) || !msgs.length) return "empty"; + return createHash("sha256").update(JSON.stringify(msgs[0])).digest("hex").slice(0, 16); +} + +function tokens(s) { + return Math.round(s.length / CHARS_PER_TOKEN); +} + +function stableStringify(v) { + return JSON.stringify(v); +} + +// The cache key prefix, in API order: params gate everything, then +// system, then tools, then messages one by one. +function frontMatter(body) { + return stableStringify({ + model: body.model ?? null, + max_tokens: body.max_tokens ?? null, + temperature: body.temperature ?? null, + thinking: body.thinking ?? null, + output_config: body.output_config ?? null, + system: body.system ?? null, + tools: body.tools ?? null, + }); +} + +function stripCacheControl(msg) { + if (!msg || !Array.isArray(msg.content)) return msg; + return { + ...msg, + content: msg.content.map((b) => { + if (b && typeof b === "object" && b.cache_control) { + const { cache_control, ...rest } = b; + return rest; + } + return b; + }), + }; +} + +// Marker positions in a request: message indices carrying cache_control, +// ascending. The system/tools blocks may carry markers too; those are +// covered by the frontMatter gate (a front change busts everything). +function markerIndices(messages) { + const out = []; + for (let i = 0; i < (messages?.length ?? 0); i++) { + const m = messages[i]; + if (m && Array.isArray(m.content) && m.content.some((b) => b?.cache_control)) out.push(i); + } + return out; +} + +// Cumulative token size of messages[0..i] (cache_control stripped so a +// marker moving doesn't read as a content change). +function cumSizes(messages) { + const sizes = []; + let acc = 0; + for (const m of messages ?? []) { + acc += tokens(stableStringify(stripCacheControl(m))); + sizes.push(acc); + } + return sizes; +} + +export function simulatePair(prevBody, nowBody) { + const prevMsgs = prevBody.messages ?? []; + const nowMsgs = nowBody.messages ?? []; + const frontTok = tokens(frontMatter(nowBody)); + const sizes = cumSizes(nowMsgs); + const totalTok = frontTok + (sizes[sizes.length - 1] ?? 0); + + // Front gate: params/system/tools differ -> nothing survives. + if (frontMatter(prevBody) !== frontMatter(nowBody)) { + return { hitTok: 0, writeTok: totalTok, divergence: "front", totalTok }; + } + + // First divergent message index (cache_control-stripped comparison). + let div = -1; + const n = Math.min(prevMsgs.length, nowMsgs.length); + for (let i = 0; i < n; i++) { + if ( + stableStringify(stripCacheControl(prevMsgs[i])) !== + stableStringify(stripCacheControl(nowMsgs[i])) + ) { + div = i; + break; + } + } + if (div === -1) div = prevMsgs.length; // pure append (or identical) + + // Highest PREVIOUS-request marker at an index < div whose prefix + // survived — that's the breakpoint the API can resume from. + const prevMarkers = markerIndices(prevMsgs).filter((i) => i < div); + const best = prevMarkers.length ? prevMarkers[prevMarkers.length - 1] : -1; + + const hitTok = best >= 0 ? frontTok + (sizes[best] ?? 0) : 0; + return { + hitTok, + writeTok: totalTok - hitTok, + divergence: div >= prevMsgs.length ? "append" : `messages@${div}`, + bestMarker: best, + totalTok, + }; +} + +async function main() { + const argv = process.argv.slice(2); + const json = argv.includes("--json"); + const usePipeline = argv.includes("--pipeline"); + const env = {}; + for (let i = 0; i < argv.length; i++) { + if (argv[i] === "--env") { + const kv = argv[++i] ?? ""; + const eq = kv.indexOf("="); + if (eq > 0) env[kv.slice(0, eq)] = kv.slice(eq + 1); + } + } + const file = argv.find((a) => !a.startsWith("--") && !argv[argv.indexOf(a) - 1]?.startsWith("--env")); + if (!file) { + process.stderr.write( + "usage: node tools/cache-sim.mjs [--pipeline] [--env FLAG=1 ...] [--json]\n", + ); + process.exit(2); + } + + // Pipeline mode: same loader and scratch-state discipline as replay.mjs, so + // the bodies priced below are the bytes that would actually go on the wire. + let runOnRequest = null; + let extensions = null; + let scratch = null; + if (usePipeline) { + scratch = await mkdtemp(join(tmpdir(), "cache-sim-")); + process.env.CLAUDE_CONFIG_DIR = scratch; + for (const [k, v] of Object.entries(env)) process.env[k] = v; + const here = dirname(fileURLToPath(import.meta.url)); + const pipeline = await import(new URL("../proxy/pipeline.mjs", import.meta.url).href); + runOnRequest = pipeline.runOnRequest; + extensions = await pipeline.loadExtensions( + join(here, "..", "proxy", "extensions"), + join(here, "..", "proxy", "extensions.json"), + ); + } + + const byKey = new Map(); + const rows = []; + // readLines, not readline: with --pipeline this loop awaits runOnRequest + // per line, and readline's push-based iterator buffers the whole remaining + // file during those awaits — the same defect measured at 3.27 GB in + // replay.mjs (see tools/read-lines.mjs). + for await (const line of readLines(file)) { + if (!line.trim()) continue; + let rec; + try { + rec = JSON.parse(line); + } catch { + continue; + } + let body = rec.body; + if (usePipeline) { + const ctx = { + body: structuredClone(rec.body), + headers: { + "anthropic-beta": rec.headers?.["anthropic-beta"] ?? undefined, + "x-session-id": rec.headers?.["session-id"] ?? rec.sid ?? undefined, + }, + meta: { route: "messages" }, + }; + await runOnRequest(ctx, extensions); + body = ctx.body; + } + // Group by (capture key, CONVERSATION), never by key alone. One session-id + // header carries the main thread, every subagent, and CC's sidecar calls; + // pricing a subagent's request against the main thread's predecessor + // reports the tenant switch as a full-context bust. Measured on a + // 602-request capture: key-only grouping called 227 of 601 pairs busts, + // when the same corpus has a handful of real ones. Identical artifact to + // the one that made replay's first stability gate report false green. + const cid = conversationId(body?.messages); + const group = `${rec.key}|${cid}`; + const prev = byKey.get(group); + if (prev) { + const sim = simulatePair(prev, body); + rows.push({ ts: rec.ts, key: rec.key, ...sim }); + } + // Retain only the previous body per group — a capture does not fit in + // memory, and only the immediate predecessor is ever needed. + byKey.set(group, body); + } + if (scratch) await rm(scratch, { recursive: true, force: true }); + + if (json) { + process.stdout.write(JSON.stringify(rows, null, 2) + "\n"); + return; + } + let write = 0; + let hit = 0; + const busts = rows.filter((r) => r.writeTok > 20000); + for (const r of rows) { + write += r.writeTok; + hit += r.hitTok; + } + process.stdout.write(`pairs simulated: ${rows.length}\n`); + process.stdout.write(`total predicted write-tokens: ${write} hit-tokens: ${hit}\n`); + process.stdout.write(`predicted busts (>20k write): ${busts.length}\n`); + for (const b of busts.slice(0, 30)) { + process.stdout.write( + ` ${b.ts} key=${b.key} write=${b.writeTok} div=${b.divergence} bestMarker=${b.bestMarker ?? "-"}\n`, + ); + } +} + +// Only run main when invoked directly, so tests can import simulatePair. +if (import.meta.url === `file://${process.argv[1]}`) { + main().catch((err) => { + process.stderr.write(`cache-sim failed: ${err?.stack ?? err}\n`); + process.exit(1); + }); +} diff --git a/tools/gate-live.mjs b/tools/gate-live.mjs new file mode 100644 index 00000000..0227c394 --- /dev/null +++ b/tools/gate-live.mjs @@ -0,0 +1,434 @@ +#!/usr/bin/env node +// gate-live — run the replay gate over the LIVE captures, on a schedule. +// +// Why this exists, and it is not "extra coverage". +// +// Two defects surfaced in the gate itself on 2026-07-28, and both were +// invisible for the same structural reason: the gate had never been pointed at +// a production-shaped input. +// +// 1. it read the capture with readFile(..., "utf-8"), so a 955 MB capture +// threw `RangeError: Invalid string length` before a single check ran; +// 2. it retained every request's full message history, peaking at 3.2 GB — +// within sight of V8's default ceiling. +// +// Neither could ever be caught by `npm test`, and not by accident. The +// committed corpus is produced by harvest.mjs, which selects pairs by +// STRUCTURAL NOVELTY and sanitises them: small by construction, and +// deliberately so. A fixture corpus curated for structural novelty cannot +// contain a scale-shaped input — the blind spot is designed in. So scale, +// volume and ordering-at-scale are exactly the classes that stay green in CI +// forever while being broken in practice. +// +// The live captures are the only production-shaped inputs available, they +// exist on disk already, and something is already walking them twice a day +// (cache-fix-harvest). This runs the real gate against them and writes a +// verdict a checker can read, so "the gate cannot run" and "the gate found +// something in live traffic" both surface within a day instead of on the next +// occasion someone happens to try it by hand. +// +// One child process per capture, deliberately: memory stays bounded to the +// largest single capture rather than their sum, and a crash on one file is +// recorded rather than ending the sweep. Whatever kills one capture is +// precisely what this is here to report. + +import { spawn, spawnSync } from "node:child_process"; +import { readdir, stat, writeFile, mkdir } from "node:fs/promises"; +import { join, dirname } from "node:path"; +import { homedir, hostname } from "node:os"; +import { fileURLToPath } from "node:url"; + +import { sourceFingerprint, PROXY_ROOT } from "../proxy/source-fingerprint.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const REPLAY = join(__dirname, "replay.mjs"); +const CENSUS = join(__dirname, "reminder-migration-census.mjs"); +const DEFAULT_CAPTURES = join(homedir(), ".claude", "cache-fix-captures"); +const DEFAULT_STATUS = join(homedir(), ".claude", "cache-fix-gate-status.json"); + +// --- Production gate set --- +// +// The gate must replay the configuration that is actually SERVING, not the +// extensions' defaults. Learned the expensive way on 2026-07-28: replay +// inherits nothing from the systemd unit, and `CACHE_FIX_TOOL_REWRITE` +// defaults OFF while the unit sets it ON. So every gate run that day — this +// sweep included — exercised a pipeline nobody runs, and reported 0 +// violations. Re-run with the unit's own gates, the same corpus produced 2 +// stability violations attributed to deferred-tool-rewrite. A green verdict +// over the wrong configuration is worth nothing. +// +// The unit is the declaration of what production is, so it is the source +// here — read live rather than copied, because a copy is a second source that +// drifts. Two are overridden OFF deliberately: REQUEST_CAPTURE would have the +// replay write captures of the captures, and SESSION_MIRROR would write +// mirrors; neither transforms the request, so excluding them costs no +// coverage, and both are named in the output so nobody reads them as tested. +const ARTIFACT_ONLY = new Set(["CACHE_FIX_REQUEST_CAPTURE", "CACHE_FIX_SESSION_MIRROR"]); + +export function parseUnitEnvironment(showOutput) { + // `systemctl show -p Environment` yields one line: Environment=A=1 B=2 + const line = (showOutput || "").trim(); + const body = line.startsWith("Environment=") ? line.slice("Environment=".length) : line; + const out = []; + for (const tok of body.split(/\s+/)) { + if (!tok.includes("=")) continue; + const k = tok.slice(0, tok.indexOf("=")); + if (!k.startsWith("CACHE_FIX_")) continue; + if (ARTIFACT_ONLY.has(k)) continue; + out.push(tok); + } + return out; +} + +function productionEnv() { + const res = spawnSync( + "systemctl", + ["--user", "show", "cache-fix-proxy", "-p", "Environment", "--value"], + { encoding: "utf-8" }, + ); + if (res.status !== 0 || !res.stdout) return { env: [], source: "unavailable" }; + const env = parseUnitEnvironment(res.stdout); + return { env, source: env.length ? "cache-fix-proxy.service" : "empty" }; +} + +// The heap cap on replay children is a CHECK, not a tuning knob. A replay +// that truly streams needs memory only for its compact per-request retention +// (~15% of capture bytes; 0.61 GB measured on the 1.5 GB capture) — nowhere +// near this cap even at the 8 GB rotation ceiling (~1.2 GB projected). A +// replay that silently regressed into retaining its input needs a multiple +// of the file size and dies against the cap, turning the regression into an +// error row that fails the sweep the same day instead of an OOM years later. +// Proven red on the real defect: the pre-8b7ed9e replay OOMs under this cap +// in 5 s on the 1.5 GB capture; the fixed one finishes with 3× headroom. +export const CHILD_HEAP_CAP_MB = 2048; + +export function replayArgs(file, env) { + // --census rides on every sweep: the row-4 annotations (edit positions, + // anchorDelta, tools deltas, mitigation pricing) were built as census-only + // and a sweep without them re-derives nothing daily — the classifications + // exist precisely so the next instance is recognized, not re-derived. + const args = [`--max-old-space-size=${CHILD_HEAP_CAP_MB}`, REPLAY, file, "--json", "--census"]; + for (const kv of env) args.push("--env", kv); + return args; +} + +// The byte-gate rides the same sweep, as a second child per capture. +// +// Two answers only this delivers daily. The migration byte-test is the gate +// "every NORMALIZATION design must pass before it ships" (dev-loop.md) and was +// run by hand, at design time, over whatever corpus existed that day — while +// its own COVERAGE was the thing that failed silently (it skipped the four +// largest captures for weeks). And prune classification: an INTERIOR-DIVERGENT +// prune re-bills settled history, ranges from 2 messages to a whole context, +// and had no daily reader at all — it took a throwaway drop-scan probe to see +// one. Both are cheap next to the replay (20 s over the whole corpus against +// the replay's minutes), and neither has a home outside this sweep. +export function censusArgs(file) { + return [`--max-old-space-size=${CHILD_HEAP_CAP_MB}`, CENSUS, file, "--json"]; +} + +// The census exits 1 when it could not read something, so the exit CODE is not +// the signal here — the JSON is. A run that produced no JSON could not answer +// at all, which is recorded as an error rather than as zero findings (the +// three-answer rule this tool exists to keep). +export function summariseCensus(res) { + if (res.code === -1) return { error: res.err }; + let parsed = null; + try { + parsed = JSON.parse(res.out); + } catch { + return { error: res.err.trim().split("\n").slice(-4).join("\n") || "no JSON output" }; + } + return { + pairs: parsed.pairs ?? 0, + unreadable: (parsed.unreadable ?? []).length, + tally: parsed.tally ?? null, + extendedSub: parsed.extendedSub ?? null, + prunes: parsed.prunes ?? null, + }; +} + +// A capture being written to right now is not a defect and not a skip: the +// gate reads a prefix of it, which is a valid corpus. Recorded so a reader can +// tell a short run from a truncated one. +function runChild(args) { + return new Promise((resolve) => { + const child = spawn("node", args, { + stdio: ["ignore", "pipe", "pipe"], + }); + let out = ""; + let err = ""; + child.stdout.on("data", (d) => (out += d)); + child.stderr.on("data", (d) => (err += d)); + child.on("error", (e) => resolve({ code: -1, out: "", err: String(e?.message ?? e) })); + child.on("close", (code) => resolve({ code, out, err })); + }); +} + +const runReplay = (file, env) => runChild(replayArgs(file, env)); +const runCensus = (file) => runChild(censusArgs(file)); + +function summarise(file, bytes, res) { + const row = { file, bytes, exit: res.code }; + if (res.code === -1) { + row.error = res.err; + return row; + } + let parsed = null; + try { + parsed = JSON.parse(res.out); + } catch { + // The gate died before producing a verdict — a RangeError, an OOM, a + // throw. This is the case the whole job exists for, so it is recorded + // verbatim rather than smoothed into a count of zero. + row.error = (res.err.trim().split("\n").slice(-4).join("\n") || "no JSON output"); + return row; + } + row.requests = parsed.report?.length ?? 0; + row.stability = parsed.violations?.length ?? 0; + row.safety = parsed.safety?.length ?? 0; + // Content conservation (the fifth gate): bytes CC sent that the pipeline + // neither forwarded nor accounted for. Ranked with safety rather than with + // stability — a suppression whose copy is not on the wire is a truncated + // conversation, not an expensive one. `conservationResidue` rides along as + // the population the gate deliberately does NOT examine (assistant-role + // blocks), so a reader of the status file sees the boundary instead of + // inferring that a clean row covered everything. + row.conservation = parsed.conservation?.length ?? 0; + row.conservationResidue = parsed.conservationResidue ?? 0; + row.sequence = parsed.sequence?.length ?? 0; + row.order = parsed.orderViolations?.length ?? 0; + row.unparseable = (parsed.report ?? []).filter((r) => r.error).length; + // Replay fidelity: whether this run reproduced the bytes the proxy really + // forwarded. A mismatch means the invariants above were measured on a + // system that never ran, so it is recorded per capture rather than left in + // stdout nobody reads. `comparable: 0` is an honest "proves nothing", NOT a + // pass — the distinction the row must preserve. + // A row that compared NOTHING proves nothing: zero same-conversation + // pairs (empty bodies, single-request captures) ran zero cross-request + // checks. Named rather than silently counted into the clean total — + // "9 captures sauber" with three unproving rows was a padded verdict. + row.pairs = parsed.census?.pairs ?? null; + row.provesNothing = row.pairs === 0; + const f = parsed.fidelity; + if (f) { + row.fidelityComparable = f.comparable ?? 0; + row.fidelityMatched = f.matched ?? 0; + row.fidelityMismatch = (f.mismatches ?? []).length; + // Informational pair: on busy sessions every request is mutated, so the + // comparable population stays 0 forever and this is the only fidelity + // signal recorded. Never part of rowIsClean — a mutated mismatch is + // legitimate state divergence. + row.fidelityMutatedComparable = f.mutatedComparable ?? 0; + row.fidelityMutatedMatched = f.mutatedMatched ?? 0; + } + // Threat-matrix row 6's consumer path (BACKLOG "Row 6's isolating query + // is built and unread (Q3)"): findToolsDeltas already classifies every + // tools[]-changing pair, --census rides every sweep (replayArgs above), + // but nothing before this read it — a daily answer sat unread in stdout. + // Compact counts only (no bodies): row 6 asks specifically for the + // TOOLS-ONLY case (tools moved, message history did not — the isolating + // pair) and whether what we FORWARDED held stable across it. + // Consumers: threat-matrix row 6 and the operator reading gate status. + if (Array.isArray(parsed.toolsDeltas)) { + const deltas = parsed.toolsDeltas; + const forwardedStable = deltas.filter((d) => d.forwardedStable).length; + // heldStable narrows forwardedStable's whole-array claim to the + // SHARED-name subset of the pair — the guarantee deferred-tool-rewrite + // actually makes (BACKLOG "forwardedStable was a census framing gap": a + // genuine new-tool announcement always moves the whole-array signature, + // so forwardedStable=false on those pairs is expected, not a leak). + const heldStable = deltas.filter((d) => d.heldStable).length; + row.toolsDeltas = { + count: deltas.length, + toolsOnly: deltas.filter((d) => d.toolsOnly).length, + forwardedStable, + leaked: deltas.length - forwardedStable, + heldStable, + heldUnstable: deltas.length - heldStable, + }; + } + return row; +} + +const rowIsClean = (r) => + !r.error && + r.exit === 0 && + !r.stability && + !r.safety && + !r.conservation && + !r.sequence && + !r.order && + // A fidelity mismatch invalidates every other number in the row. + !r.fidelityMismatch && + // A capture the byte-gate could not READ is a could-not-verify, and this + // sweep is where that has to bite: the whole defect was a normalization gate + // reporting clean over a corpus it never read. Findings the byte-gate DOES + // make (MISMATCH, interior prunes) are carried, not failed — they are + // findings about Claude Code's traffic, not about this pipeline, and a check + // that fires on a non-defect trains its reader to ignore red. + !r.byteGate?.error && + !r.byteGate?.unreadable; + +/** One line per capture: what the byte-gate measured, or why it could not. */ +export function describeByteGate(g) { + if (!g) return "not run"; + if (g.error) return `COULD NOT RUN — ${g.error.split("\n")[0]}`; + if (g.unreadable) return `COULD NOT READ ${g.unreadable} capture(s) — verdict does not cover them`; + const t = g.tally ?? {}; + const p = g.prunes ?? {}; + const merged = g.extendedSub?.["MERGED-STANDALONE"] ?? 0; + return ( + `${t.EXACT ?? 0} EXACT / ${t.EXTENDED ?? 0} EXTENDED (${merged} merged) / ` + + `${t.DROPPED ?? 0} DROPPED / ${t.MISMATCH ?? 0} MISMATCH; ` + + `prunes ${p.pure ?? 0} pure / ${p.interior ?? 0} interior` + + (p.unanchored ? ` / ${p.unanchored} unanchored` : "") + ); +} + +function parseArgs(argv) { + const args = { captures: DEFAULT_CAPTURES, status: DEFAULT_STATUS, quiet: false }; + for (let i = 2; i < argv.length; i++) { + const a = argv[i]; + if (a === "--captures") args.captures = argv[++i]; + else if (a === "--status") args.status = argv[++i]; + else if (a === "--quiet") args.quiet = true; + else { + process.stderr.write(`unexpected argument: ${a}\n`); + process.exit(2); + } + } + return args; +} + +async function main() { + const args = parseArgs(process.argv); + const started = new Date().toISOString(); + + // Resolve the SERVING configuration before anything else, and say so: a + // sweep whose gate set is unknown is not a verdict about production. + const { env: prodEnv, source: envSource } = productionEnv(); + if (!args.quiet) { + process.stdout.write(`gates from ${envSource}: ${prodEnv.length ? prodEnv.join(" ") : "(none — replaying DEFAULTS, not production)"}\n`); + process.stdout.write(` excluded as artifact-only: ${[...ARTIFACT_ONLY].join(", ")}\n\n`); + } + + let files = []; + try { + files = (await readdir(args.captures)).filter((f) => f.endsWith("-requests.jsonl")); + } catch (e) { + process.stderr.write(`no capture directory at ${args.captures}: ${e?.message ?? e}\n`); + process.exit(2); + } + + const rows = []; + for (const f of files.sort()) { + const full = join(args.captures, f); + let bytes = 0; + try { + bytes = (await stat(full)).size; + } catch { + continue; + } + // An empty capture has no pairs to compare; running the gate on it proves + // nothing and its "0 violations" would pad the verdict. + if (bytes === 0) continue; + const res = await runReplay(full, prodEnv); + const row = summarise(f, bytes, res); + row.byteGate = summariseCensus(await runCensus(full)); + rows.push(row); + if (!args.quiet) { + const verdict = row.error + ? `ERROR ${row.error.split("\n")[0]}` + : rowIsClean(row) + ? "clean" + : `stability=${row.stability} safety=${row.safety} conservation=${row.conservation} sequence=${row.sequence} order=${row.order}` + + (row.fidelityMismatch ? ` FIDELITY-MISMATCH=${row.fidelityMismatch}` : "") + + (row.byteGate?.unreadable ? " BYTE-GATE-UNREADABLE" : "") + + (row.byteGate?.error ? " BYTE-GATE-ERROR" : ""); + process.stdout.write(`${f} (${(bytes / 1e6).toFixed(1)} MB, ${row.requests ?? "?"} req): ${verdict}\n`); + process.stdout.write(` byte-gate: ${describeByteGate(row.byteGate)}\n`); + } + } + + const failed = rows.filter((r) => !rowIsClean(r)); + const proving = rows.filter((r) => !r.error && !r.provesNothing); + // Sweep-level byte-gate totals: the daily answer to "did a normalization + // rule hold corpus-wide, and did any prune re-bill settled history". Read by + // the operator and by doctor; per-capture rows keep the detail. + const byteGate = rows.reduce((acc, r) => { + const g = r.byteGate; + if (!g) return acc; + if (g.error) { acc.errors++; return acc; } + acc.unreadable += g.unreadable ?? 0; + for (const k of ["EXACT", "EXTENDED", "DROPPED", "MISMATCH"]) acc.tally[k] += g.tally?.[k] ?? 0; + acc.merged += g.extendedSub?.["MERGED-STANDALONE"] ?? 0; + acc.newText += g.extendedSub?.["NEW-TEXT"] ?? 0; + for (const k of ["pure", "interior", "unanchored"]) acc.prunes[k] += g.prunes?.[k] ?? 0; + return acc; + }, { errors: 0, unreadable: 0, merged: 0, newText: 0, + tally: { EXACT: 0, EXTENDED: 0, DROPPED: 0, MISMATCH: 0 }, + prunes: { pure: 0, interior: 0, unanchored: 0 } }); + // Fingerprints of the code this sweep actually exercised. The verdict + // used to record which CONFIG it replayed but never which CODE — so a + // morning verdict stayed "fresh" (age bound) across an afternoon of + // replay/extension changes, and the compensating step was human memory. + let code = null; + try { + code = { + proxyTree: await sourceFingerprint(PROXY_ROOT), + toolsTree: await sourceFingerprint(dirname(fileURLToPath(import.meta.url))), + }; + } catch { + code = null; // never block the verdict on the stamp; absent reads as unstamped + } + const status = { + version: 1, + started, + finished: new Date().toISOString(), + code, + // os.hostname(), not $HOSTNAME: systemd user units export no HOSTNAME, + // so the env var wrote "unknown" into every scheduled run's status file. + host: hostname(), + gates: prodEnv, + gateSource: envSource, + captures: rows.length, + bytes: rows.reduce((a, r) => a + r.bytes, 0), + failing: failed.length, + proving: proving.length, + unproving: rows.length - failed.length >= 0 ? rows.filter((r) => r.provesNothing).length : 0, + // ok requires at least one PROVING row: a sweep of empty and + // single-request captures ran zero cross-request checks. + ok: failed.length === 0 && proving.length > 0, + byteGate, + rows, + }; + await mkdir(dirname(args.status), { recursive: true }); + await writeFile(args.status, JSON.stringify(status, null, 2) + "\n"); + + if (!args.quiet) { + process.stdout.write( + `\n${rows.length} capture(s), ${(status.bytes / 1e6).toFixed(0)} MB, ${failed.length} failing -> ${args.status}\n` + + `byte-gate corpus-wide: ${byteGate.tally.EXACT} EXACT / ${byteGate.tally.EXTENDED} EXTENDED ` + + `(${byteGate.merged} merged-standalone, ${byteGate.newText} new-text) / ` + + `${byteGate.tally.DROPPED} DROPPED / ${byteGate.tally.MISMATCH} MISMATCH; ` + + `prunes ${byteGate.prunes.pure} pure / ${byteGate.prunes.interior} INTERIOR-DIVERGENT` + + (byteGate.prunes.unanchored ? ` / ${byteGate.prunes.unanchored} unanchored` : "") + + (byteGate.unreadable || byteGate.errors + ? `\n COULD NOT VERIFY: ${byteGate.unreadable} unreadable capture(s), ${byteGate.errors} failed run(s)\n` + : "\n"), + ); + } + // Non-zero on a failing sweep AND on an empty one: "no captures" means the + // gate proved nothing, which must not read as a pass. + process.exit(status.ok ? 0 : 1); +} + +if (process.argv[1] && fileURLToPath(import.meta.url) === process.argv[1]) { + main().catch((err) => { + process.stderr.write(`gate-live failed: ${err?.stack ?? err}\n`); + process.exit(2); + }); +} + +export { summarise, rowIsClean }; diff --git a/tools/harvest.mjs b/tools/harvest.mjs new file mode 100644 index 00000000..56a6157e --- /dev/null +++ b/tools/harvest.mjs @@ -0,0 +1,885 @@ +#!/usr/bin/env node +// harvest — promote NOVEL request pairs from live captures into permanent, +// committable regression fixtures. +// +// Usage: +// node tools/harvest.mjs [--captures DIR] [--out DIR] [--ledger FILE] +// [--dry-run] [--json] +// +// The problem it solves. Live captures are the only source of real CC +// behaviour, and they are transient: measured 2026-07-28, one day of use +// produced 677 MB against a 2 GB cap that deletes oldest-first — roughly +// three days of retention. Every finding in that session came from two +// captures that would have been gone within the week. Meanwhile 94.5% of +// captured request pairs are plain appends carrying nothing we do not +// already know, and capture size grows QUADRATICALLY with session length +// (each request re-sends the whole history), so keeping everything is not an +// option either. +// +// So: keep the ~5% that is structurally novel, discard the rest, and make +// what is kept safe to commit. +// +// Runs BOTH scheduled and ad-hoc: cache-fix-harvest.timer fires it twice +// daily (fixtures, shape watch and growth snapshots must not depend on +// someone remembering), and the ledger is what makes every run idempotent — +// watermarks track what has been harvested, so a manual run between timer +// firings harvests nothing twice and a month of silence catches up in one +// pass. Silent failure of the schedule is watched: shape-verdicts warns when +// the newest ledger entry goes stale (HARVEST_MAX_AGE_H). +// +// --- Why a ledger with WATERMARKS, not a "harvested" flag --- +// +// A capture file is append-only and keyed by session-id, so a session that +// resumes keeps growing the same file. A boolean flag would freeze coverage +// at whatever the file contained the first time it was seen — a session +// harvested at 400 requests and later grown to 900 would have its last 500 +// permanently invisible. The watermark records how far we got; the next run +// resumes there. +// +// It also removes the need to know whether a session is "finished", a +// question with no reliable answer: sessions end by crash, by sleep, by +// /clear, or never. +// +// --- Sanitization --- +// +// Captures contain real conversation content. Fixtures must be committable, +// so every text body is replaced by a deterministic token derived from its +// hash. This is safe precisely because every class we chase is STRUCTURAL — +// shape flips, splits, prunes, splices, reorders. The text is irrelevant; +// only the arrangement matters. +// +// Two things survive verbatim, because for them the content IS the class: +// - WRAPPER TAGS (the volatile-block detector matches on +// the wrapper, so replacing it would erase the very property under +// test); the text they wrap is still tokenized like any other text +// (scrubText), not replaced by a fixed placeholder — a fixed +// placeholder made every reminder hash identically regardless of real +// content, which breaks the separate class where a reminder migrates +// OUT of its wrapper into a standalone duplicate message and must still +// hash-match its wrapped original post-scrub (see scrubText's comment) +// - structural ids: tool_use_id / id pairs, which must stay consistent or +// the tool-adjacency invariant breaks +// +// Tool SCHEMAS are dropped rather than sanitized: they carry descriptions +// and parameter docs, and no message-shape class depends on them. +// +// Two classes below the text layer, added 2026-07-31 after both were found +// LIVE in committed fixtures (docs/audits/pr-prep-2026-07-31/pr-prep-report.md; +// docs/directives/fixture-sanitization-directive.md): +// +// - NESTED PAYLOADS. A block's binary content sits at `block.source.data`, +// one level below the `block.data` this scrubber redacted, so five raw +// PNGs rode into a public repo behind a header claiming the fixture kept +// "no raw text at all". scrubBlock now recurses into `source` and fails +// CLOSED there: `data` always, plus any other string over 64 chars. +// - STRUCTURAL CAPTURE IDENTIFIERS. Session keys/sids and wall-clock +// timestamps are not conversation content, so the text scrub never saw +// them; they identify a real session, a real machine and a real moment. +// Keys and sids become `s-` (sidToken) — same hashing +// scheme, `s-` prefix kept so readers that pattern-match it still work — +// and timestamps are rebased onto a FIXED epoch keeping their intra- +// fixture deltas (rebaseTimestamps), so ordering and proximity joins +// survive with the wall-clock gone. The same token names the FIXTURE +// FILE, so no session UUID survives in a filename either. +// +// Accepted residual (operator ruling 2026-07-31, local operator-controlled +// traffic): token lengths, paragraph structure, intra-fixture timing deltas, +// and equality relations. See the audience caveat on scrubText below. + +import { readdir, readFile, writeFile, stat, mkdir } from "node:fs/promises"; +import { join, dirname } from "node:path"; +import { fileURLToPath, pathToFileURL } from "node:url"; +import { createHash } from "node:crypto"; +import { homedir, hostname } from "node:os"; + +import { censusPair } from "./replay.mjs"; +import { readLines } from "./read-lines.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const DEFAULT_CAPTURES = join(homedir(), ".claude", "cache-fix-captures"); +const DEFAULT_OUT = join(__dirname, "..", "test", "fixtures", "harvested"); +// PER-MACHINE ledger. Fixtures are committed and therefore shared across +// machines — which is the point, since a bust class found on one machine +// should regress-test on both. Fixture FILENAMES already cannot collide (they +// embed the capture key and request index), but a single shared ledger would +// conflict on every merge: both machines write the same file, and the +// watermarks inside are machine-local facts about machine-local captures. +// Splitting by hostname makes the conflict structurally impossible and makes +// "which machine still has unharvested captures" readable at a glance. +const LEDGER_HOST = (process.env.CACHE_FIX_HARVEST_HOST || hostname() || "unknown").replace( + /[^A-Za-z0-9._-]/g, + "_", +); +export const DEFAULT_LEDGER = join( + __dirname, + "..", + "test", + "fixtures", + "harvested", + `LEDGER-${LEDGER_HOST}.json`, +); + +const sha = (s) => createHash("sha256").update(s).digest("hex"); + +// --- Sanitization --- + +const VOLATILE_WRAP = /^\n([\s\S]*)\n<\/system-reminder>\s*$/; + +// Deterministic placeholder: same input text always yields the same token, so +// a message that repeats across requests still compares equal — which is the +// whole point, since identity matching is what we are testing. +// +// A wrapped reminder re-wraps its OWN deterministic token instead of a fixed +// constant. A fixed constant ("REDACTED" for every reminder regardless of +// content) was tried first and is wrong: CC sometimes migrates a reminder +// OUT of its wrapper into a standalone duplicate message +// (insertion-normalization.mjs's findSuppressibleDuplicate/ +// unwrapVolatileText compares the wrapped original's stripped bytes against +// the standalone copy's bytes to suppress the duplicate). A fixed constant +// made the wrapped original hash to "REDACTED" while the unwrapped +// duplicate — never matching VOLATILE_WRAP — hashed its real text +// independently, so the two never matched post-scrub and the suppression +// class became unobservable in any fixture built from it (measured +// empirically while building the harvest --pin fixture for capture +// s-633915a8 n=26->28: suppressed count 1->0, outputForm "append"-> +// "splice@31" under the fixed-constant scrub). Recursing scrubText on the +// captured inner text keeps both sides deterministic and equal when their +// real bytes were equal, wrapped or not — the wrapper tags still survive +// verbatim, so a check that only tests for wrapper PRESENCE is unaffected. +// +// PER SEGMENT, not per whole text: the scrub is a homomorphism over "\n\n". +// Tokenizing whole texts destroyed the relations that DEFINE the classes we +// harvest for — measured, not inferred (extended-absorb-report §c5): +// `scrub(a + "\n\n" + b) !== scrub(a) + "\n\n" + scrub(b)`, so a fixture +// pinned for a merged-standalone pair could not reproduce the class it was +// pinned for. "\n\n" is the domain's join and nothing narrower: the census's +// canonical()/classify() join stripped reminder blocks with it, and +// insertion-normalization's duplicate suppression compares the same join. +// Splitting on it makes both survive scrubbing (test/harvest-scrub-relations +// .test.mjs). A boundary that lands inside a longer newline run re-splits and +// loses the relation — that degrades to the old whole-text behaviour, no +// crash and no leak, and sub-paragraph relations are not promised at all. +// +// Audience caveat on the privacy delta. Per-segment tokens expose paragraph +// COUNT, per-paragraph LENGTHS, and cross-text sharing of identical +// paragraphs, where whole-text tokens exposed one total length and whole-text +// equality. No content bytes either way. That delta is accepted for THIS +// deployment because the captured traffic is local and operator-controlled +// (operator ruling 2026-07-31). Anyone harvesting non-local or third-party +// traffic must re-make that judgment before committing fixtures publicly: a +// length vector can fingerprint a known public text that a single total +// length would not. +const PARA_SEP = "\n\n"; +// Longest string under `source` that counts as a shape field rather than a +// payload. The known shape fields (`type`, `media_type`, `url`-style short +// forms) sit far below this; an unknown longer one is treated as content. The +// asymmetry is deliberate: a shape field wrongly tokenized is an unreadable +// but visible token in a fixture, while a payload wrongly passed is a silent +// leak into a public repo. +const SOURCE_SHAPE_MAX = 64; +function scrubText(text) { + if (typeof text !== "string") return text; + const wrapped = VOLATILE_WRAP.exec(text); + if (wrapped) return `\n${scrubText(wrapped[1])}\n`; + // An empty segment carries no bytes, so there is nothing to tokenize; it + // stays empty and the separators around it survive untouched. + return text + .split(PARA_SEP) + .map((seg) => (seg === "" ? "" : `t_${sha(seg).slice(0, 12)}_${seg.length}`)) + .join(PARA_SEP); +} + +function scrubBlock(block) { + if (typeof block === "string") return scrubText(block); + if (!block || typeof block !== "object") return block; + const out = { ...block }; + if (typeof out.text === "string") out.text = scrubText(out.text); + if (typeof out.thinking === "string" && out.thinking !== "") out.thinking = scrubText(out.thinking); + if (typeof out.signature === "string") out.signature = `sig_${sha(out.signature).slice(0, 10)}`; + if (typeof out.data === "string") out.data = `data_${sha(out.data).slice(0, 10)}`; + // The payload one level down. `source.data` is where the wire actually + // carries image bytes; `type`/`media_type` and the other short shape fields + // are structure and survive, because a reader branching on them is testing + // the block's KIND. Fail CLOSED on everything else: the wire format is not + // ours to freeze, so an unrecognised string over 64 chars under `source` is + // treated as a payload rather than waved through. + if (out.source && typeof out.source === "object" && !Array.isArray(out.source)) { + out.source = Object.fromEntries( + Object.entries(out.source).map(([k, v]) => + typeof v === "string" && (k === "data" || v.length > SOURCE_SHAPE_MAX) + ? [k, `data_${sha(v).slice(0, 10)}`] + : [k, v], + ), + ); + } + // tool_result content can be a string or a block array. + if (typeof out.content === "string") out.content = scrubText(out.content); + else if (Array.isArray(out.content)) out.content = out.content.map(scrubBlock); + // Tool inputs are arbitrary user data; keep only the key SHAPE. + if (out.input && typeof out.input === "object") { + out.input = Object.fromEntries(Object.keys(out.input).map((k) => [k, "REDACTED"])); + } + return out; +} + +export function scrubMessage(msg) { + if (!msg || typeof msg !== "object") return msg; + const out = { ...msg }; + if (typeof out.content === "string") out.content = scrubText(out.content); + else if (Array.isArray(out.content)) out.content = out.content.map(scrubBlock); + return out; +} + +// --- Structural identifiers: keys, sids, wall-clock --- +// +// A conversation key or sid is a live capture identifier, not content, so the +// text scrub never touched it. Same hashing scheme as everything else, and the +// `s-` prefix of a real key is kept so a reader that pattern-matches `s-…` +// still works. Distinctness is preserved (different originals hash apart) and +// so is equality (the same original always yields the same token), which is +// what lets a fixture still show "these records are one conversation". +export const sidToken = (original) => `s-${sha(original).slice(0, 12)}`; + +// Rebased onto a fixed epoch, keeping every DELTA from the fixture's earliest +// instant. Ordering survives, so does proximity — bust-triage-style ±window +// joins still work INSIDE a fixture — while the wall-clock (which machine, at +// what hour, in what timezone) is gone. Fixture-wide by necessity: the +// earliest instant is a property of the whole artifact, not of one record, +// which is why this runs at fixture-WRITE time rather than inside scrubRecord. +export const FIXED_EPOCH = "2000-01-01T00:00:00.000Z"; +const FIXED_EPOCH_MS = Date.parse(FIXED_EPOCH); +const ISO_INSTANT = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|[+-]\d{2}:\d{2})$/; + +// Whole-string instants only. A date inside authored prose (a fixture's own +// "measured on 2026-07-30" provenance note, a growth artifact's filename) is +// documentation the artifact exists to carry, not capture data. +function mapStrings(node, fn) { + if (typeof node === "string") return fn(node); + if (Array.isArray(node)) return node.map((v) => mapStrings(v, fn)); + if (node && typeof node === "object") { + return Object.fromEntries(Object.entries(node).map(([k, v]) => [k, mapStrings(v, fn)])); + } + return node; +} + +export function rebaseTimestamps(fixture) { + let earliest = null; + mapStrings(fixture, (s) => { + if (!ISO_INSTANT.test(s)) return s; + const t = Date.parse(s); + if (Number.isFinite(t) && (earliest === null || t < earliest)) earliest = t; + return s; + }); + if (earliest === null) return fixture; + return mapStrings(fixture, (s) => { + if (!ISO_INSTANT.test(s)) return s; + const t = Date.parse(s); + return Number.isFinite(t) ? new Date(FIXED_EPOCH_MS + (t - earliest)).toISOString() : s; + }); +} + +export function scrubRecord(rec) { + const body = rec.body ?? {}; + const system = Array.isArray(body.system) + ? body.system.map(scrubBlock) + : typeof body.system === "string" + ? scrubText(body.system) + : body.system; + return { + ts: rec.ts, + sid: rec.sid ? sidToken(rec.sid) : null, + key: rec.key ? sidToken(rec.key) : null, + headers: { "anthropic-beta": rec.headers?.["anthropic-beta"] ?? null }, + body: { + model: body.model, + system, + // Tool definitions carry descriptions and parameter docs and no + // message-shape class depends on them; keep the NAMES so tools[] + // add/remove/reorder classes stay observable. + tools: Array.isArray(body.tools) ? body.tools.map((t) => ({ name: t?.name })) : undefined, + messages: Array.isArray(body.messages) ? body.messages.map(scrubMessage) : [], + }, + }; +} + +// --- Ledger --- + +async function loadLedger(path) { + try { + return JSON.parse(await readFile(path, "utf-8")); + } catch { + return { version: 1, keys: {} }; + } +} + +// --- Harvest --- + +const conversationId = (msgs) => (msgs?.length ? sha(JSON.stringify(msgs[0])).slice(0, 12) : null); + +// A pair is novel when its structural class is one we have not banked yet. +// "append-only" and "identical" are never novel — they are the 94.5% baseline. +const BORING = new Set(["append-only", "identical"]); + +// Records may be a plain array (tests, small corpora) or a lazy accessor — +// see scanCapture, which keeps only ONE request per conversation resident so +// a multi-hundred-MB capture does not become multi-GB of live objects. +export function selectNovelPairs(records, seenClasses) { + const groups = new Map(); + records.forEach((rec, i) => { + const cid = conversationId(rec.body?.messages); + if (cid === null) return; + if (!groups.has(cid)) groups.set(cid, []); + groups.get(cid).push(i); + }); + const picks = []; + for (const idxs of groups.values()) { + for (let k = 1; k < idxs.length; k++) { + const a = records[idxs[k - 1]]; + const b = records[idxs[k]]; + const kind = censusPair(a.body?.messages ?? [], b.body?.messages ?? []); + if (BORING.has(kind)) continue; + if (seenClasses.has(kind)) continue; + seenClasses.add(kind); + picks.push({ kind, prev: idxs[k - 1], cur: idxs[k] }); + } + } + return picks; +} + +// --- Shape watch: the two dormant thinking classes, plus baseline growth --- +// +// Both classes were measured INACTIVE on 2026-07-29 and would otherwise be +// watched by nothing. This is the mechanism that replaces the one-off probes: +// harvest already parses every record twice a day, so the counters ride the +// existing scan and land in the per-machine ledger, where a checker can WARN +// the day either class activates. +// +// thinkingTextCompleted — thinking blocks with NON-EMPTY text in completed +// assistant turns of each conversation's newest request. Measured today: +// 0 everywhere (all 277 deep-history blocks are signature-only stubs). +// Non-zero means CC started re-sending completed-turn thinking content +// (CC#69568's population reappearing) — quiet context growth with no +// bust to make it loud, which is exactly why nothing else would notice. +// thinkingDropPairs — consecutive same-conversation pairs where a thinking +// block left the SHARED history region (CC#76253's class; measured 2 of +// 323 pairs today, context-pruning-shaped). A rate jump means per-turn +// mid-history rewrites. +// systemBytes / toolsBytes — serialized size of the newest request's +// system[] and tools[], max across conversations. The quiet-growth +// baseline: version-inflated prompts (CC#47528 measured +94% across six +// releases) show up here as a step, without any bust. + +export function completedThinkingTextCount(msgs) { + if (!Array.isArray(msgs)) return 0; + let n = 0; + for (let i = 0; i < msgs.length; i++) { + const m = msgs[i]; + if (m?.role !== "assistant" || !Array.isArray(m.content) || m.content.length === 0) continue; + // Active tool-continuation (terminal tool_use answered by the following + // tool_result) keeps its thinking BY CONTRACT — not part of this count. + const last = m.content[m.content.length - 1]; + if (last?.type === "tool_use") { + const next = msgs[i + 1]; + const answered = + Array.isArray(next?.content) && + next.content.some((b) => b?.type === "tool_result" && b.tool_use_id === last.id); + if (answered) continue; + } + for (const b of m.content) { + if (b?.type === "thinking" && typeof b.thinking === "string" && b.thinking.trim()) n++; + } + } + return n; +} + +// --- Growth-step snapshots: the evidence must outlive capture rotation --- +// +// The shape block records SIZES; when the baseline steps (a CC update +// inflating the system prompt, a tool description ballooning), the diff that +// EXPLAINS the step lives in the capture — which rotates. These snapshot the +// changed component at detection time: identity and per-item sizes, content +// scrubbed with the same deterministic tokens as fixtures, so the artifact +// is committable and diffable long after the bytes that caused it are gone. +// +// SINGLE SOURCE for the growth thresholds: tools/shape-verdicts.mjs (the +// alarm) imports them from here (the evidence freezer), and the deployment +// repo's doctor only invokes that CLI — no mirrored numbers anywhere. +// Growth only: shrinkage is visible intent. +export const GROWTH_STEP_THRESHOLD = 0.15; +export const GROWTH_STEP_FLOOR = 5000; + +export function detectGrowthSteps(priorShape, shape) { + if (!priorShape || !shape) return []; + const steps = []; + for (const field of ["systemBytes", "toolsBytes"]) { + const old = priorShape[field] ?? 0; + const now = shape[field] ?? 0; + if (old >= GROWTH_STEP_FLOOR && now > old * (1 + GROWTH_STEP_THRESHOLD)) { + steps.push({ field, oldBytes: old, newBytes: now }); + } + } + return steps; +} + +// Identity + per-item size, content scrubbed. Enough to say WHICH block or +// tool grew and by how much, without carrying a byte of real content. +export function growthComponentSnapshot(body) { + const sys = body?.system; + return { + system: Array.isArray(sys) + ? sys.map((b) => ({ ...scrubBlock(b), bytes: JSON.stringify(b).length })) + : typeof sys === "string" + ? { text: scrubText(sys), bytes: sys.length } + : null, + tools: Array.isArray(body?.tools) + ? body.tools.map((t) => ({ name: t?.name ?? null, bytes: JSON.stringify(t).length })) + : [], + }; +} + +export function thinkingCountInPrefix(msgs, upto) { + let n = 0; + for (const m of (msgs ?? []).slice(0, upto)) { + if (m?.role !== "assistant" || !Array.isArray(m.content)) continue; + for (const b of m.content) { + if (b?.type === "thinking" || b?.type === "redacted_thinking") n++; + } + } + return n; +} + +// Single streaming pass that decides novelty WITHOUT holding the file. +// +// Streaming the read was not enough: retaining every parsed record turned a +// 555 MB capture into a 2.1 GB memory peak (measured from the systemd unit's +// own accounting on the first scheduled run — a background job has no business +// taking 2 GB). Pairs are only ever formed between CONSECUTIVE requests of the +// same conversation, so exactly one predecessor per conversation needs to be +// resident; everything else is garbage the moment its successor is classified. +// +// Returns the picks with both records already materialised, so the caller +// never needs a second pass over the file. +export async function scanCapture(path, seenClasses, minIndex = 0) { + const prevByConv = new Map(); // conversation id -> { rec, index } + const picks = []; + let count = 0; + const shape = { pairs: 0, thinkingDropPairs: 0, thinkingTextCompleted: 0, systemBytes: 0, toolsBytes: 0 }; + // For growth snapshots: the last request BEFORE the watermark carries the + // "old" component (it was the newest at the previous harvest), the + // max-baseline conversation-newest carries the "new". Rough on purpose — + // cross-conversation pairs are possible and documented in the artifact; + // the per-item sizes carry the attribution either way. + let watermarkBody = null; + let newestBody = null; + // readLines, not readline: this loop body is currently await-free, so + // readline happened not to run ahead here — but one await added to the body + // would silently buffer the whole remaining file (see tools/read-lines.mjs + // for the measured failure in replay.mjs). Same reader everywhere, so the + // property is structural rather than an accident of the loop body. + for await (const line of readLines(path)) { + if (!line.trim()) continue; + let rec; + try { + rec = JSON.parse(line); + } catch { + count++; + continue; + } + // Outcome records carry no body and must not consume a request index — + // watermarks are stated in request numbers. + if (rec.type === "outcome" || rec.type === "boot") continue; + const index = count++; + const cid = conversationId(rec.body?.messages); + if (cid === null) continue; + if (index === minIndex - 1) watermarkBody = rec.body ?? null; + const prev = prevByConv.get(cid); + prevByConv.set(cid, { rec, index }); + if (!prev || index < minIndex) { + if (prev) shapePairs(shape, prev.rec, rec); + continue; + } + shapePairs(shape, prev.rec, rec); + const kind = censusPair(prev.rec.body?.messages ?? [], rec.body?.messages ?? []); + if (BORING.has(kind) || seenClasses.has(kind)) continue; + seenClasses.add(kind); + picks.push({ kind, prevRec: prev.rec, rec, cur: index }); + } + // Newest request per conversation: the completed-thinking population and + // the baseline prefix sizes (max across conversations — the main session + // dominates, sidecars are noise). + for (const { rec } of prevByConv.values()) { + const body = rec.body ?? {}; + shape.thinkingTextCompleted += completedThinkingTextCount(body.messages); + const sysBytes = JSON.stringify(body.system ?? "").length; + const toolBytes = JSON.stringify(body.tools ?? []).length; + if (Math.max(sysBytes, toolBytes) >= Math.max(shape.systemBytes, shape.toolsBytes)) { + newestBody = body; + } + shape.systemBytes = Math.max(shape.systemBytes, sysBytes); + shape.toolsBytes = Math.max(shape.toolsBytes, toolBytes); + } + return { picks, count, shape, watermarkBody, newestBody }; +} + +function shapePairs(shape, prevRec, rec) { + shape.pairs++; + const a = prevRec.body?.messages ?? []; + const b = rec.body?.messages ?? []; + if (b.length >= a.length && thinkingCountInPrefix(b, a.length) < thinkingCountInPrefix(a, a.length)) { + shape.thinkingDropPairs++; + } +} + +function parseArgs(argv) { + const args = { + captures: DEFAULT_CAPTURES, + out: DEFAULT_OUT, + ledger: DEFAULT_LEDGER, + dryRun: false, + json: false, + pinKey: null, + pinRange: null, + }; + for (let i = 2; i < argv.length; i++) { + const a = argv[i]; + if (a === "--captures") args.captures = argv[++i]; + else if (a === "--out") args.out = argv[++i]; + else if (a === "--ledger") args.ledger = argv[++i]; + else if (a === "--dry-run") args.dryRun = true; + else if (a === "--json") args.json = true; + else if (a === "--pin") { + args.pinKey = argv[++i]; + args.pinRange = argv[++i]; + } else { + process.stderr.write(`unexpected argument: ${a}\n`); + process.exit(2); + } + } + return args; +} + +// --- --pin: freeze a sanitized range as a named, committable fixture --- +// +// BACKLOG.md "READY — harvest --pin freezes evidence ranges as fixtures": +// real-pair tests (test/insertion-suppression.test.mjs, +// test/mitigation-output-form.test.mjs) SKIP once their capture rotates out +// of the retention window. --pin freezes the evidence those tests need +// while the capture still holds it, using the SAME scrubRecord sanitizer as +// the scheduled harvest — never a second scrubber. +// +// Range vs. replay-from-start: both real-pair tests replay the capture from +// request 0 (not from n), because insertion-normalization keeps +// per-conversation canonical state that only matches CC's own behaviour if +// every prior request was replayed in order. A fixture containing only +// records n..m would desync that state and reconstruct n..m incorrectly. +// So the fixture holds every record (boot, outcome, request) from the +// START OF THE FILE through request m inclusive — n..m is the PAIR under +// test and names the fixture, not a truncation point. This is stated +// explicitly in the fixture's header so a reader does not assume n..m bounds +// the content. +export function parsePinRange(rangeStr) { + const m = /^(\d+)\.\.(\d+)$/.exec(rangeStr ?? ""); + if (!m) throw new Error(`--pin range must look like .., got: ${rangeStr}`); + const n = Number(m[1]); + const end = Number(m[2]); + if (end < n) throw new Error(`--pin range end must be >= start: ${rangeStr}`); + return { n, m: end }; +} + +// Boot/outcome records carry no conversation content, so they need no text +// scrubbing — only the identifiers get hashed, matching scrubRecord's own +// sid/key convention (same sha() helper, same prefix style), so this is +// still ONE hashing scheme, not a second scrubber. +function scrubBootRecord(rec) { + return { ts: rec.ts, type: "boot", proxyTree: rec.proxyTree ?? null, gates: rec.gates ?? null }; +} +function scrubOutcomeRecord(rec) { + return { + ts: rec.ts, + type: "outcome", + id: rec.id ? `id_${sha(rec.id).slice(0, 8)}` : null, + key: rec.key ? sidToken(rec.key) : null, + requestId: rec.requestId ? `rq_${sha(rec.requestId).slice(0, 8)}` : null, + model: rec.model ?? null, + usage: rec.usage ?? null, + outSha: rec.outSha ?? null, + outBytes: rec.outBytes ?? null, + ms: rec.ms ?? null, + }; +} + +// Streams capturePath from its start and returns every record (boot, +// outcome, request — sanitized) through the request whose file-wide ordinal +// (counting only non-boot/non-outcome records, same counting rule +// scanCapture and both real-pair tests use) equals `m`. Throws if the +// capture has fewer than m+1 request records — a pin that cannot be +// fulfilled must fail loudly, not write a truncated fixture silently. +export async function pinRange(capturePath, m) { + const records = []; + let count = 0; + let reached = false; + for await (const line of readLines(capturePath)) { + if (!line.trim()) continue; + let rec; + try { + rec = JSON.parse(line); + } catch { + continue; + } + if (rec.type === "boot") { + records.push(scrubBootRecord(rec)); + continue; + } + if (rec.type === "outcome") { + records.push(scrubOutcomeRecord(rec)); + continue; + } + const idx = count++; + records.push(scrubRecord(rec)); + if (idx === m) { + reached = true; + break; + } + } + if (!reached) { + throw new Error(`capture ${capturePath} has only ${count} request record(s), cannot pin through m=${m}`); + } + return records; +} + +async function runPin(args) { + let n, m; + try { + ({ n, m } = parsePinRange(args.pinRange)); + } catch (err) { + process.stderr.write(`${err.message}\n`); + process.exit(2); + } + const key = args.pinKey; + if (!key) { + process.stderr.write("--pin requires a argument\n"); + process.exit(2); + } + const capturePath = join(args.captures, `${key}-requests.jsonl`); + try { + await stat(capturePath); + } catch { + process.stderr.write(`no capture found for key ${key} at ${capturePath}\n`); + process.exit(2); + } + + let records; + try { + records = await pinRange(capturePath, m); + } catch (err) { + process.stderr.write(`${err.message}\n`); + process.exit(1); + } + + const fixture = rebaseTimestamps({ + header: { + key: sidToken(key), + range: { n, m }, + replayFrom: 0, + note: + "records holds the FULL prefix 0..m, not just n..m: the real-pair " + + "tests replay every request from index 0 in order because " + + "insertion-normalization's per-conversation canonical state is " + + "stateful (see tools/harvest.mjs runPin's header comment). n..m " + + "names the pair under test, not a truncation point.", + harvestedAt: new Date().toISOString(), + sanitizer: + "tools/harvest.mjs scrubRecord + rebaseTimestamps. TOKENIZED: every " + + "text, per '\\n\\n' segment, as t__ (tool schemas dropped; " + + " WRAPPERS survive verbatim around a tokenized inner " + + "text); every nested payload (block.data, block.source.data, any " + + ">64-char string under source) as data_; thinking signatures " + + "as sig_; conversation keys and sids as s-, the same " + + "token the filename carries. REBASED: every timestamp onto " + + "2000-01-01T00:00:00.000Z + its original delta from this fixture's " + + "earliest instant. PRESERVED (this is what the fixture is FOR): " + + "equality of equal texts, the '\\n\\n' join and paragraph-prefix " + + "relations, tool_use_id/id pairing, message and block ordering, and " + + "timestamp ordering and spacing within the fixture. RESIDUAL, " + + "accepted: token lengths, paragraph counts, intra-fixture timing " + + "deltas. Verified, not asserted: test/harvest-scrub-relations.test.mjs " + + "walks this file and re-checks each absence class mechanically.", + }, + records, + }); + + // File name carries the key's sanitized token, never the session UUID — a + // filename is as public as the content, and `pinned-s-633915a8-…` named a + // real session. Same token as the header and the records, so a reader can + // still tell which fixtures came from one capture. + const outName = `pinned-${sidToken(key)}-${n}-${m}.json`; + const outPath = join(args.out, outName); + if (!args.dryRun) { + await mkdir(args.out, { recursive: true }); + await writeFile(outPath, JSON.stringify(fixture, null, 2) + "\n"); + } + process.stdout.write( + `pinned ${records.length} record(s), range ${n}..${m} (full prefix from 0), to ${outPath}` + + `${args.dryRun ? " (dry run)" : ""}\n`, + ); +} + +// Fixture-fallback reader: yields the same [n, line] tuple shape as +// readCapture, over a pinned fixture's `records` array, so a consumer of +// readCapture can swap sources without changing its own parsing loop. +export async function* readPinnedFixture(fixturePath) { + const { records } = JSON.parse(await readFile(fixturePath, "utf-8")); + for (let i = 0; i < records.length; i++) { + yield [i, JSON.stringify(records[i])]; + } +} + +async function main() { + const args = parseArgs(process.argv); + if (args.pinKey !== null) { + await runPin(args); + return; + } + const ledger = await loadLedger(args.ledger); + const report = { harvested: [], skipped: [], expired: [], scanned: 0 }; + + let files = []; + try { + files = (await readdir(args.captures)).filter((f) => f.endsWith("-requests.jsonl")); + } catch { + process.stderr.write(`no capture directory at ${args.captures}\n`); + process.exit(2); + } + + // A key the ledger knows but disk no longer has was deleted by the capture + // retention cap before we harvested it. That is the signal for whether the + // cap is large enough — reported, never silent. + for (const [key, entry] of Object.entries(ledger.keys)) { + if (!files.includes(`${key}-requests.jsonl`) && !entry.gone) { + entry.gone = true; + report.expired.push({ key, watermark: entry.requests ?? 0 }); + } + } + + // Novelty is judged against EVERY machine's ledger, not just this one's. + // The ledger is per-machine (watermarks are local facts), but the fixture + // set is shared — so a class machine A already banked must not be harvested + // again by machine B. Reading the sibling ledgers keeps the shared corpus + // deduplicated without needing a shared writer. + const seenClasses = new Set(Object.values(ledger.keys).flatMap((e) => e.classes ?? [])); + try { + const ledgerDir = dirname(args.ledger); + for (const f of await readdir(ledgerDir)) { + if (!f.startsWith("LEDGER-") || !f.endsWith(".json")) continue; + if (join(ledgerDir, f) === args.ledger) continue; + try { + const other = JSON.parse(await readFile(join(ledgerDir, f), "utf-8")); + for (const e of Object.values(other.keys ?? {})) for (const c of e.classes ?? []) seenClasses.add(c); + } catch {} + } + } catch {} + + for (const file of files) { + const key = file.replace(/-requests\.jsonl$/, ""); + const path = join(args.captures, file); + const st = await stat(path); + const prior = ledger.keys[key] ?? { requests: 0, classes: [] }; + + // STREAM, never readFile, and never retain the file. A capture is the + // whole conversation re-sent per request, so it grows quadratically: a + // single live session reached 555 MB here — past Node's ~512 MB maximum + // string length, so readFile threw outright — and merely streaming while + // KEEPING every parsed record still peaked at 2.1 GB. scanCapture holds + // one predecessor per conversation and nothing else. Every request is + // still examined, because a novel pair may straddle the watermark; only + // pairs at or beyond it are eligible to be harvested. + const { picks, count, shape, watermarkBody, newestBody } = + await scanCapture(path, seenClasses, prior.requests); + report.scanned += count; + if (count <= prior.requests) { + report.skipped.push({ key, requests: count }); + continue; + } + + // Growth steps vs this ledger's own prior entry: freeze the evidence + // while the capture still holds it (see the snapshot helpers' header). + for (const step of detectGrowthSteps(prior.shape, shape)) { + const date = new Date().toISOString().slice(0, 10); + const name = `growth-${sidToken(key)}-${step.field}-${date}.json`; + const artifact = { + key: sidToken(key), + ...step, + // "old" = newest at the previous harvest (last pre-watermark + // request); "new" = current max-baseline conversation-newest. May + // span conversations; per-item sizes carry attribution either way. + watermark: watermarkBody ? growthComponentSnapshot(watermarkBody) : null, + newest: newestBody ? growthComponentSnapshot(newestBody) : null, + }; + if (!args.dryRun) { + await mkdir(args.out, { recursive: true }); + await writeFile(join(args.out, name), JSON.stringify(artifact, null, 2) + "\n"); + } + report.growth = report.growth ?? []; + report.growth.push({ key, field: step.field, file: name, oldBytes: step.oldBytes, newBytes: step.newBytes }); + } + + for (const pick of picks) { + const name = `harvested-${pick.kind.replace(/[^a-z]+/gi, "-")}-${sidToken(key)}-${pick.cur}.jsonl`; + // Rebased as ONE unit, so the pair's own inter-request delta — the + // only timing fact a two-record fixture carries — survives. + const body = + rebaseTimestamps([pick.prevRec, pick.rec].map(scrubRecord)) + .map((r) => JSON.stringify(r)) + .join("\n") + "\n"; + if (!args.dryRun) { + await mkdir(args.out, { recursive: true }); + await writeFile(join(args.out, name), body); + } + report.harvested.push({ key, kind: pick.kind, file: name, at: pick.cur }); + } + + ledger.keys[key] = { + requests: count, + bytes: st.size, + lastHarvest: new Date().toISOString(), + classes: [...new Set([...(prior.classes ?? []), ...picks.map((p) => p.kind)])], + // Shape watch (see the helpers' header): a checker reads these and + // warns the day a dormant class activates or the baseline steps. + shape, + }; + } + + if (!args.dryRun) { + await mkdir(dirname(args.ledger), { recursive: true }); + await writeFile(args.ledger, JSON.stringify(ledger, null, 2) + "\n"); + } + + if (args.json) { + process.stdout.write(JSON.stringify(report, null, 2) + "\n"); + } else { + process.stdout.write( + `scanned ${report.scanned} requests across ${files.length} capture(s)${args.dryRun ? " (dry run)" : ""}\n`, + ); + process.stdout.write(`harvested ${report.harvested.length} novel pair(s)\n`); + for (const h of report.harvested) process.stdout.write(` ${h.kind.padEnd(20)} ${h.file}\n`); + if (report.skipped.length) process.stdout.write(`up to date: ${report.skipped.length} capture(s)\n`); + for (const g of report.growth ?? []) { + process.stdout.write( + `GROWTH STEP: ${g.key.slice(0, 20)} ${g.field} ${g.oldBytes}->${g.newBytes} — evidence frozen in ${g.file}\n`, + ); + } + if (report.expired.length) { + process.stdout.write( + `\nWARNING: ${report.expired.length} capture(s) expired before harvest — raise CACHE_FIX_CAPTURE_MAX_MB\n`, + ); + for (const e of report.expired) process.stdout.write(` ${e.key} (last seen at ${e.watermark} requests)\n`); + } + } +} + +if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) { + main().catch((err) => { + process.stderr.write(`harvest failed: ${err?.stack ?? err}\n`); + process.exit(1); + }); +} diff --git a/tools/probe-tool-addition.mjs b/tools/probe-tool-addition.mjs new file mode 100644 index 00000000..fe6cd42b --- /dev/null +++ b/tools/probe-tool-addition.mjs @@ -0,0 +1,148 @@ +#!/usr/bin/env node +// probe-tool-addition — measure, per model, whether the API accepts the +// mid-conversation-tool-changes contract (tool_addition blocks). +// +// Exists because the allowlist in deferred-tool-rewrite.mjs is opt-in with +// evidence required, and the evidence was collected the expensive way once: +// the extension announced additions to every model, and on 2026-07-28 a +// sonnet-5 dispatch died with +// +// API Error: 400 tool_addition/tool_removal is not supported on this model +// +// after which TOOL_ADDITION_MODELS was cut to the one model with wire +// evidence. This script is the cheap way: one minimal real request per model, +// same auth path production uses (the CC OAuth credentials the proxy keeps +// fresh), wire shapes IMPORTED from the extension rather than re-typed here — +// a probe that hand-rolls the shape tests the probe author's memory, not the +// contract (the identity-key lesson, again). +// +// Direct to the API, not through the proxy — deliberately. The question is a +// property of the API endpoint per model, and the proxy would wrap the probe +// in session state, capture records and telemetry that all describe traffic +// no session sent. The directive's "one live request through the proxy" +// acceptance step remains what it is: end-to-end validation of the EXTENSION, +// done once per gate flip. This measures the MODEL support matrix. +// +// Three answers per model, never two: +// ACCEPTED — HTTP 200 with the addition block on the wire +// REJECTED — HTTP 400 naming tool_addition/tool_removal +// COULD NOT VERIFY — anything else (auth failure, rate limit, network, +// unrelated 400); reported verbatim, never classified, and the +// process exits non-zero so a broken probe cannot read as a +// clean sweep. +// +// KNOWN LIMIT (measured 2026-07-29): on a subscription OAuth token, this +// direct-API probe gets HTTP 429 for EVERY big model (opus, sonnet, fable) +// regardless of quota state — hand-built requests are refused for those +// models; only haiku answers, because CC itself sends it free-form utility +// traffic. For big models the working probe is a real session: start a +// throwaway proxy with CACHE_FIX_TOOL_ADDITION_EXTRA= on a spare +// port, run `claude --model -p` through it with a prompt that loads +// a tool via ToolSearch, then verify on production's capture that the +// injected block was forwarded byte-identically (replay the pipeline, +// compare against the outcome record's outSha) and that an outcome record +// exists (only written on a streamed 200). That is how fable-5 was measured. +// +// An ACCEPTED verdict is the evidence an allowlist entry cites (prefix + +// probe date); nothing is edited automatically. + +import { readFile } from "node:fs/promises"; +import { join } from "node:path"; +import { homedir } from "node:os"; + +import { + buildToolAdditionMessage, + injectAdditions, + forwardedTools, + anchorHash, + addBetaToken, +} from "../proxy/extensions/deferred-tool-rewrite.mjs"; + +const API = "https://api.anthropic.com/v1/messages"; + +// The current Claude lineup as CC sends it. Override: pass model ids as argv. +const DEFAULT_MODELS = [ + "claude-opus-5", + "claude-fable-5", + "claude-sonnet-5", + "claude-haiku-4-5-20251001", +]; + +async function accessToken() { + const raw = await readFile(join(homedir(), ".claude", ".credentials.json"), "utf-8"); + const c = JSON.parse(raw); + const o = c.claudeAiOauth ?? c; + if (!o.accessToken) throw new Error(".credentials.json carries no accessToken"); + if (o.expiresAt && o.expiresAt < Date.now()) { + throw new Error("access token expired — start a Claude Code session to refresh it"); + } + return o.accessToken; +} + +function probeBody(model) { + // Two tools: one present from the start, one "added mid-conversation" via + // the real builders. forwardedTools marks the added one defer_loading; the + // addition message is injected at its anchor exactly as onRequest does. + const toolA = { + name: "echo_base", + description: "Echo the input string.", + input_schema: { type: "object", properties: { s: { type: "string" } }, required: ["s"] }, + }; + const toolB = { + name: "echo_added", + description: "Echo the input string (added mid-conversation).", + input_schema: { type: "object", properties: { s: { type: "string" } }, required: ["s"] }, + }; + const user = { role: "user", content: "Reply with the single word ok. Do not use tools." }; + const additions = [ + { + names: [toolB.name], + anchorHash: anchorHash(user), + message: buildToolAdditionMessage([toolB.name]), + }, + ]; + const { messages } = injectAdditions([user], additions); + return { + model, + max_tokens: 16, + messages, + tools: forwardedTools([toolA, toolB], additions), + }; +} + +async function probe(model, token) { + const headers = { + "content-type": "application/json", + "anthropic-version": "2023-06-01", + "anthropic-beta": "oauth-2025-04-20", + authorization: `Bearer ${token}`, + }; + addBetaToken(headers); // the same token the extension puts on real traffic + let res, text; + try { + res = await fetch(API, { method: "POST", headers, body: JSON.stringify(probeBody(model)) }); + text = await res.text(); + } catch (e) { + return { model, verdict: "COULD NOT VERIFY", detail: `network: ${e?.message ?? e}` }; + } + if (res.status === 200) return { model, verdict: "ACCEPTED", detail: "HTTP 200" }; + if (res.status === 400 && /tool_addition|tool_removal/.test(text)) { + return { model, verdict: "REJECTED", detail: text.slice(0, 200) }; + } + return { model, verdict: "COULD NOT VERIFY", detail: `HTTP ${res.status}: ${text.slice(0, 300)}` }; +} + +const models = process.argv.slice(2).length ? process.argv.slice(2) : DEFAULT_MODELS; +const token = await accessToken(); +let unverified = 0; +console.log(`probing ${models.length} model(s) against ${API}\n`); +for (const m of models) { + const r = await probe(m, token); + if (r.verdict === "COULD NOT VERIFY") unverified++; + console.log(`${r.verdict.padEnd(18)} ${m}`); + if (r.verdict !== "ACCEPTED") console.log(` ${r.detail}\n`); +} +if (unverified) { + console.error(`\n${unverified} model(s) COULD NOT be verified — that is not a verdict either way.`); + process.exit(1); +} diff --git a/tools/read-lines.mjs b/tools/read-lines.mjs new file mode 100644 index 00000000..5f07b690 --- /dev/null +++ b/tools/read-lines.mjs @@ -0,0 +1,53 @@ +// Pull-based line reader for JSONL captures. +// +// Why not readline.createInterface: its async iterator provides NO +// backpressure once the consumer awaits. readline is push-based — the +// underlying stream keeps emitting 'line' events while the consumer is parked +// on an await, and the iterator queues them unboundedly. Measured on a live +// 1.5 GB capture (2026-07-29): a consumer that awaited ~40 ms per line held +// 1.2 GB after 25 lines and the ENTIRE remaining file (~2.3 GB as decoded +// strings) by line 75. That is how "stream the capture" (3bcf8ac) still +// peaked at 3.27 GB — the read no longer slurped, the iterator queue did. +// The defect is invisible to a consumer that blocks synchronously (the event +// loop never turns, so the stream cannot run ahead), which is exactly how the +// first probe missed it. +// +// A raw stream's async iterator is pull-based: nothing is read until next() +// is called, so between yields the file position stands still. Buffering here +// is bounded by highWaterMark + the longest single line, whatever the +// consumer does between iterations. The test pins the mechanism: after +// consuming a line with awaits in between, the stream's bytesRead may not +// have run ahead of the consumed bytes by more than that bound. +// +// Encoding is set on the stream so Node's own StringDecoder handles UTF-8 +// sequences split across chunk boundaries. + +import { createReadStream } from "node:fs"; + +export const READ_CHUNK_SIZE = 1 << 20; // 1 MiB; capture lines reach several MB + +/** + * Yield lines from a file (or a provided Readable in "utf8" encoding — the + * injection point the backpressure test uses to watch bytesRead). + * A trailing "\r" is stripped so CRLF input behaves like readline's + * crlfDelay: Infinity. A final unterminated line is yielded; a trailing + * newline yields no empty final line. + */ +export async function* readLines(pathOrStream) { + const stream = + typeof pathOrStream === "string" + ? createReadStream(pathOrStream, { encoding: "utf8", highWaterMark: READ_CHUNK_SIZE }) + : pathOrStream; + let buf = ""; + for await (const chunk of stream) { + buf += chunk; + let i; + while ((i = buf.indexOf("\n")) !== -1) { + let line = buf.slice(0, i); + buf = buf.slice(i + 1); + if (line.endsWith("\r")) line = line.slice(0, -1); + yield line; + } + } + if (buf.length > 0) yield buf.endsWith("\r") ? buf.slice(0, -1) : buf; +} diff --git a/tools/reminder-migration-census.mjs b/tools/reminder-migration-census.mjs new file mode 100755 index 00000000..97675d48 --- /dev/null +++ b/tools/reminder-migration-census.mjs @@ -0,0 +1,557 @@ +#!/usr/bin/env node +// reminder-migration-census — measure the row-4 container migration across a +// capture corpus, and BYTE-TEST the canonical rule a mitigation would use. +// +// Why this exists: the migration was hand-derived from two occurrences in one +// capture. The canonical rule reproduced one of them byte-exactly and failed +// the other — a split invisible at n=1, and the difference between a +// mitigation that absorbs a bust and one that moves it (threat matrix, +// "Byte-match test"). A design resting on a hand-derivation is resting on the +// prototype; this is the mechanism, so the next session gets the answer +// without re-deriving it. +// +// The class (threat matrix row 4): Claude Code first appends hook +// additional-context as text blocks INSIDE the preceding message, each wrapped +// \n...\n +// and later emits the same text as ONE standalone role:"system" message +// positioned after that host, wrappers STRIPPED and blocks JOINED with "\n\n". +// The later form re-writes history at the host's index, so everything after it +// re-bills. +// +// What it reports, per adjacent same-conversation request pair: +// EXACT — canonical reconstruction is byte-identical to CC's own later +// message. This is the absorbable population. +// EXTENDED — CC's later message CONTAINS the reconstruction as a prefix but +// carries more. Counted separately so it can never inflate the +// absorbable claim, and SUB-CLASSIFIED by where the remainder +// came from, because that is what decides a mitigation: +// MERGED-STANDALONE — the remainder is, byte-for-byte, a +// standalone role:"system" message the BEFORE request +// already carried. CC merged an existing message into the +// migrated one; nothing new crossed the wire, so the later +// form is computable from the predecessor alone. +// NEW-TEXT — the remainder matches no such message: content +// that did not exist at the earlier request, and no +// normalization can predict it. +// An earlier revision of this header called the whole class +// "NOT absorbable by any normalization — new information, not +// re-serialization". That reading is REFUTED for the merged +// sub-class and was measured, not argued: 9 of 9 EXTENDED +// occurrences in the then-readable corpus were merged +// standalones and 0 were new text (report §b1). "Absorbable" +// still needs the placement half — see the placement block. +// DROPPED — the blocks vanished and the text is absent from the later +// request entirely. Nothing migrated, so the rule was never +// exercised; counting these as failures manufactures a blocker. +// MISMATCH — neither. Every one is a hole in the rule and is printed in +// full, because these are what would silently move a bust. +// +// Usage: +// node tools/reminder-migration-census.mjs [more.jsonl ...] +// node tools/reminder-migration-census.mjs ~/.claude/cache-fix-captures/*.jsonl +// ... --json machine-readable summary +// ... --verbose print every EXTENDED/MISMATCH body, not just a sample +// +// Exit code is 0 for a clean read and 1 only when a capture could not be read +// at all — a MISMATCH is a finding to report, not a failure of this tool. +// +// Reading is by LINE, and unreadable captures are named. Until 2026-07-31 this +// tool slurped each capture with readFileSync and swallowed the failure +// (`catch { continue; }`): on the live corpus that silently dropped the four +// LARGEST captures — 6.2 GB of 7.8 GB, 79% by bytes — on `RangeError: Cannot +// create a string longer than 0x1fffffe8 characters`, while reporting "25 +// capture(s)" as though that were the corpus. Every verdict this "gate every +// NORMALIZATION must pass" ever produced covered 21% of the bytes and said +// nothing about the rest. That is the same RangeError `replay.mjs` was fixed +// for on 2026-07-28, re-committed in a newer tool, plus the three-answer +// violation (dev-loop.md): an absence reported as a pass. So the read shares +// `read-lines.mjs` with the gate, and a run that could not read something says +// so in its verdict block instead of counting it as zero findings. + +import { createHash } from "node:crypto"; +import { readLines } from "./read-lines.mjs"; +import { firstDivergence, isHumanTurn } from "./replay.mjs"; + +const WRAP = /^\n([\s\S]*)\n<\/system-reminder>\s*$/; + +/** Text of a message, whether content is a string or a block array. */ +export function textOf(msg) { + const c = msg?.content; + if (typeof c === "string") return c; + if (!Array.isArray(c)) return ""; + return c.filter((x) => x && x.type === "text").map((x) => x.text ?? "").join(""); +} + +/** + * Stable identity for a HOST message across two requests: the tool_use_id of + * its leading tool_result block. Index cannot be used (it shifts), and text + * cannot (the reminder text repeats verbatim many times in one conversation — + * matching on it alone picked a system message hundreds of slots away and + * produced offsets like -839). + */ +export function hostId(msg) { + const c = msg?.content; + if (!Array.isArray(c) || !c.length) return null; + const first = c[0]; + return (first && typeof first === "object" && first.tool_use_id) || null; +} + +/** Trailing text blocks of a message that are wrapped. */ +export function reminderBlocks(msg) { + const c = msg?.content; + if (!Array.isArray(c) || c.length < 2) return []; + return c.slice(1) + .filter((x) => x && x.type === "text" && typeof x.text === "string") + .map((x) => x.text) + .filter((t) => t.includes("")); +} + +/** + * The canonical standalone form: strip each wrapper, join with "\n\n". + * This is the exact rule a mitigation would apply, kept here so the census + * and the mitigation can never drift apart in what they mean by "canonical". + */ +export function canonical(blocks) { + return blocks.map((t) => { + const m = WRAP.exec(t); + return m ? m[1] : t; + }).join("\n\n"); +} + +/** Classify one reconstruction against CC's own later text. */ +export function classify(reconstructed, actual) { + if (reconstructed === actual) return "EXACT"; + if (actual.startsWith(reconstructed)) return "EXTENDED"; + return "MISMATCH"; +} + +/** + * The bytes an EXTENDED occurrence carries BEYOND the reconstruction, with the + * "\n\n" that joins them removed — the same join `canonical` uses, so the + * remainder is the merged message itself rather than the message plus glue. + */ +export function extendedRemainder(reconstructed, actual) { + const extra = actual.slice(reconstructed.length); + return extra.startsWith("\n\n") ? extra.slice(2) : extra; +} + +/** + * Where an EXTENDED remainder came from. `beforeStandalones` are the texts of + * the BEFORE request's standalone role:"system" messages — the predecessor's, + * deliberately: the question is whether the later form is derivable from what + * CC had ALREADY sent. Matching against the after request's own standalones + * would make every merge trivially true, since the message being classified is + * one of them. + */ +export function subclassifyExtended(reconstructed, actual, beforeStandalones) { + const extra = extendedRemainder(reconstructed, actual); + return beforeStandalones.includes(extra) ? "MERGED-STANDALONE" : "NEW-TEXT"; +} + +/** + * Capture records, one line at a time. Pull-based via `readLines`, so the read + * position stands still between yields: memory is bounded by what the consumer + * retains, never by the file. A read error propagates — the caller names the + * file it could not read rather than continuing as if it held nothing. + */ +async function* readRecords(path) { + for await (const line of readLines(path)) { + if (!line.trim()) continue; + let r; + try { r = JSON.parse(line); } catch { continue; } // corrupt line costs one record, not the file + if (r?.body?.messages && r?.ts) yield r; + } +} + +function analysePair(before, after) { + const b = before.body.messages, a = after.body.messages; + let wholeAfterCache = null; + const wholeAfter = () => (wholeAfterCache ??= JSON.stringify(a)); + const sysAfter = a + .map((m, j) => (m?.role === "system" ? { j, text: textOf(m) } : null)) + .filter(Boolean); + // The predecessor's standalone system messages: the population an EXTENDED + // remainder is checked against (subclassifyExtended). + const sysBefore = b.filter((m) => m?.role === "system").map(textOf); + // Every reminder block still living INLINE anywhere in `after`, by text. + // Index alignment cannot be used here: one inserted message shifts every + // later index, so comparing before[i] to after[i] reports a migration for + // messages that merely moved. (That bug scored 99.3% MISMATCH with + // actual=0ch on every row — the tell that no counterpart was found at all, + // rather than a rule that failed.) + const inlineAfter = new Set(); + for (const m of a) for (const t of reminderBlocks(m)) inlineAfter.add(t); + + const findings = []; + for (let i = 0; i < b.length; i++) { + const blocks = reminderBlocks(b[i]); + if (blocks.length === 0) continue; + // A HOST is a message whose reminder blocks left the inline form entirely. + // If any block is still inline somewhere in `after`, nothing migrated. + if (blocks.some((t) => inlineAfter.has(t))) continue; + const recon = canonical(blocks); + // Where the host ended up in `after`, by tool_use_id — needed to measure + // PLACEMENT. Content byte-matching alone is not sufficient for a + // mitigation: emitting the right bytes at the wrong index diverges the + // prefix just the same. + const hid = hostId(b[i]); + const hj = hid === null ? null : a.findIndex((m) => hostId(m) === hid); + // Duplicate reminder texts recur, so a candidate must sit AFTER its host; + // the nearest such is the migrated one. + let best = null; + for (const s of sysAfter) { + if (hj !== null && hj >= 0 && s.j <= hj) continue; + const verdict = classify(recon, s.text); + if (verdict === "EXACT") { best = { verdict, ...s }; break; } + if (verdict === "EXTENDED" && !best) best = { verdict, ...s }; + } + const offset = best && hj !== null && hj >= 0 ? best.j - hj : null; + if (best) { + const sub = best.verdict === "EXTENDED" + ? subclassifyExtended(recon, best.text, sysBefore) + : null; + findings.push({ host: i, blocks: blocks.length, ...best, recon, offset, sub }); + continue; + } + // No standalone counterpart. Distinguish a DROP from a rule failure: if + // the text is absent from `after` ENTIRELY, nothing migrated and the rule + // was never exercised — calling that MISMATCH blames the rule for a + // different phenomenon and manufactures a blocker. (Observed: a 3-block + // host whose blocks vanished as the array went 211 -> 209.) + // Serialized at most once per PAIR, not once per unmatched host: on the + // corpus's largest captures one request body is tens of MB, and the + // per-host form made this O(hosts x bytes) on exactly the files that only + // became readable when the read was fixed. + const anyPresent = blocks.some((t) => { + const inner = WRAP.exec(t); + const probe = (inner ? inner[1] : t).slice(0, 60); + return probe.length > 0 && wholeAfter().includes(JSON.stringify(probe).slice(1, -1)); + }); + findings.push({ host: i, blocks: blocks.length, + verdict: anyPresent ? "MISMATCH" : "DROPPED", + j: null, text: "", recon, sub: null }); + } + return findings; +} + +/** + * Prune classification for one same-conversation pair. + * + * A PRUNE is a pair whose message count DECREASED: CC removed entries it had + * already sent (threat-matrix row 22's suggestion-mode scaffolding is the + * measured case). What it COSTS is positional and only positional — the API + * keys on the longest identical PREFIX — so the classifier asks where the + * prefix breaks, and against what: + * + * PURE-TAIL-PRUNE the retained prefix is byte-identical up to the LIVE + * TURN: either nothing retained changed at all + * (firstDivergence === null), or the first change sits + * at or after the last human-typed message. The turn the + * user is producing is rewritten by every request + * anyway, so a prune confined to it invalidates nothing + * that was settled. Cost: the live turn, which was never + * free. + * INTERIOR-DIVERGENT the first change sits BEFORE the last human turn: + * settled history moved, and everything from that index + * re-bills. `rebilled` carries the magnitude, because + * these range from 2 messages to the whole context. + * UNANCHORED no human-typed message in the later array, so "live + * turn" has no referent and neither verdict is earned + * (dev-loop.md, "A checker has THREE answers"). Zero + * occurrences in 226 drop events across the 39-capture + * corpus — kept because the alternative is answering + * PURE without a basis, not because it is expected. + * + * The boundary is the ANCHOR rather than a distance: `isHumanTurn` is the same + * primitive row 4's verdict rests on (`anchorDelta`), and the alternative on + * offer was a message-count threshold that no definition produces. Measured on + * the pair that forced the question (2026-07-31 11:31:58, n=83->77): CC pruned + * a `[SUGGESTION MODE: …]` scaffolding block and the user's real turn landed at + * the same index — byte-for-byte the same phenomenon as the events that + * re-bill one message, differing only in how many messages the live turn had + * produced when the request went out. A threshold splits those; the anchor + * does not. + * + * Mechanized from the 2026-07-31 drop-scan probe that refuted row 22 as a bust + * cause. The probe was a throwaway with hand-rolled per-message hashes — the + * tell that a check was missing — so identity here is `firstDivergence` and + * `isHumanTurn`, imported from the gate rather than restated. + */ +export function classifyPrune(beforeMsgs, afterMsgs) { + if (!Array.isArray(beforeMsgs) || !Array.isArray(afterMsgs)) return null; + const n0 = beforeMsgs.length, n1 = afterMsgs.length; + if (n1 >= n0) return null; + const div = firstDivergence(beforeMsgs, afterMsgs); + if (div === null) return { kind: "PURE-TAIL-PRUNE", div, anchor: null, rebilled: 0, n0, n1 }; + let anchor = -1; + for (let i = 0; i < n1; i++) if (isHumanTurn(afterMsgs[i])) anchor = i; + const rebilled = n1 - div; + if (anchor < 0) return { kind: "UNANCHORED", div, anchor: null, rebilled, n0, n1 }; + return { kind: div >= anchor ? "PURE-TAIL-PRUNE" : "INTERIOR-DIVERGENT", + div, anchor, rebilled, n0, n1 }; +} + +/** + * Conversation identity: the first message's byte hash. + * + * Same definition as replay.mjs's `conversationOf` (replay.mjs:692, + * `e.inHash[0]`) — restated rather than imported because that one is + * module-private. If it ever changes there, this must follow. + * + * Grouping on it is load-bearing, and replay.mjs documents why: live traffic + * interleaves tenants (main, subagent, sidecar), so two requests of the SAME + * conversation are usually several capture lines apart. An adjacent-line scan + * silently skips those pairs. This tool made that exact error first: pairing + * by `sid` alone put a 29-message request next to a 5-message one — different + * conversations under one session — and scored them as 475 rule failures. + */ +export function conversationOf(rec) { + const m0 = rec?.body?.messages?.[0]; + if (!m0) return null; + return createHash("sha256").update(JSON.stringify(m0)).digest("hex").slice(0, 16); +} + +export async function census(paths) { + const tally = { EXACT: 0, EXTENDED: 0, DROPPED: 0, MISMATCH: 0 }; + const extendedSub = { "MERGED-STANDALONE": 0, "NEW-TEXT": 0 }; + const prunes = { pure: 0, interior: 0, unanchored: 0 }; + const pruneDetails = []; + const details = []; + const unreadable = []; + let pairs = 0, captures = 0, conversations = 0; + for (const path of paths) { + // Group by conversation, then compare consecutive requests WITHIN each + // group in arrival order — never adjacent capture lines. Streamed, so the + // grouping keeps only each conversation's PREVIOUS request rather than + // every record of the file: the pair a group yields is (previous, current) + // either way, and retaining the whole file is how the sibling tools each + // hit their own memory wall (replay.mjs's 3.2 GB peak, harvest's 2.1 GB). + const prev = new Map(); + const withPairs = new Set(); + try { + for await (const r of readRecords(path)) { + const cid = conversationOf(r); + if (cid === null) continue; + const before = prev.get(cid); + prev.set(cid, r); + if (!before) continue; + pairs++; + withPairs.add(cid); + const prune = classifyPrune(before.body.messages, r.body.messages); + if (prune) { + prunes[{ "PURE-TAIL-PRUNE": "pure", "INTERIOR-DIVERGENT": "interior", + UNANCHORED: "unanchored" }[prune.kind]]++; + pruneDetails.push({ path, ts: r.ts, ...prune }); + } + for (const f of analysePair(before, r)) { + tally[f.verdict]++; + if (f.sub) extendedSub[f.sub]++; + details.push({ path, ts: r.ts, ...f }); + } + } + } catch (e) { + // A capture that could not be read is its own answer, never a silent + // zero: it is the population this verdict does NOT cover. + unreadable.push({ path, error: String(e?.message ?? e) }); + continue; + } + if (withPairs.size) captures++; + conversations += withPairs.size; + } + return { tally, extendedSub, prunes, pruneDetails, details, pairs, captures, conversations, + unreadable, considered: paths.length }; +} + +async function main(argv) { + const args = argv.slice(2); + const json = args.includes("--json"); + const verbose = args.includes("--verbose"); + const paths = args.filter((a) => !a.startsWith("--")); + if (paths.length === 0) { + process.stderr.write("usage: reminder-migration-census ...\n"); + return 1; + } + const { tally, extendedSub, prunes, pruneDetails, details, pairs, captures, conversations, + unreadable, considered } = await census(paths); + const total = tally.EXACT + tally.EXTENDED + tally.DROPPED + tally.MISMATCH; + // Printed with every verdict, clean or not: the reader of a byte-gate needs + // the DENOMINATOR, and "25 capture(s)" over a 39-file corpus read like one. + const coverage = + `read ${considered - unreadable.length}/${considered} capture(s), ` + + `${unreadable.length} UNREADABLE, ${captures} with pairs`; + + if (json) { + process.stdout.write(JSON.stringify( + { tally, extendedSub, prunes, pairs, captures, conversations, total, considered, unreadable }, + null, 2) + "\n"); + return unreadable.length ? 1 : 0; + } + + process.stdout.write( + `\nreminder-migration census — ${coverage}, ${conversations} conversation(s), ${pairs} same-conversation pair(s)\n\n`); + if (unreadable.length) { + process.stdout.write("COULD NOT READ — outside every number below:\n"); + for (const u of unreadable) process.stdout.write(` ${u.path} :: ${u.error}\n`); + process.stdout.write("\n"); + } + // Prunes are reported before (and independently of) the migration verdict: + // they are a different class on the same pairs, and a corpus with no + // migrations at all still answers the row-22 question. + const nPrunes = prunes.pure + prunes.interior + prunes.unanchored; + process.stdout.write( + nPrunes === 0 + ? `prune events (message count decreased): none in ${pairs} pair(s)\n\n` + : `prune events (message count decreased): ${nPrunes} — ` + + `${prunes.pure} PURE-TAIL-PRUNE (prefix intact up to the live turn), ` + + `${prunes.interior} INTERIOR-DIVERGENT` + + (prunes.unanchored ? `, ${prunes.unanchored} UNANCHORED (no human turn — unclassifiable)` : "") + + "\n"); + // Sorted by what re-bills, not by time: these range from 2 messages to the + // whole context, and the deep ones are the finding. An interior prune of 2 + // is a rounding error; one of 671 is the entire conversation re-written. + const interior = pruneDetails + .filter((p) => p.kind !== "PURE-TAIL-PRUNE") + .sort((x, y) => y.rebilled - x.rebilled); + if (interior.length) { + for (const p of (verbose ? interior : interior.slice(0, 10))) { + process.stdout.write( + ` ${p.kind.padEnd(18)} ${p.ts} n=${p.n0}->${p.n1} breaks at ${p.div}` + + ` (anchor ${p.anchor ?? "none"}) re-bills ${p.rebilled} of ${p.n1}\n`); + } + if (!verbose && interior.length > 10) { + process.stdout.write(` ... ${interior.length - 10} more (--verbose for all)\n`); + } + } + if (nPrunes) process.stdout.write("\n"); + + if (total === 0) { + // "none found" must be distinguishable from "not looked for". + process.stdout.write( + " no container migrations observed in this corpus.\n" + + " (That is a measured absence, not a clean bill: the class needs a\n" + + " host whose reminder blocks move out between two adjacent requests.)\n\n"); + return unreadable.length ? 1 : 0; + } + const pct = (n) => `${((n / total) * 100).toFixed(1)}%`; + process.stdout.write( + ` ${String(tally.EXACT).padStart(5)} ${pct(tally.EXACT).padStart(6)} EXACT canonical rule reproduces CC byte-for-byte — absorbable\n` + + ` ${String(tally.EXTENDED).padStart(5)} ${pct(tally.EXTENDED).padStart(6)} EXTENDED CC's later form carries MORE than the reconstruction\n` + + (tally.EXTENDED + ? ` ${String(extendedSub["MERGED-STANDALONE"]).padStart(5)} MERGED-STANDALONE the remainder is a standalone the PREDECESSOR already sent\n` + + ` ${String(extendedSub["NEW-TEXT"]).padStart(5)} NEW-TEXT the remainder is content no earlier request carried\n` + : "") + + ` ${String(tally.DROPPED).padStart(5)} ${pct(tally.DROPPED).padStart(6)} DROPPED blocks vanished, no counterpart — nothing migrated, rule not exercised\n` + + ` ${String(tally.MISMATCH).padStart(5)} ${pct(tally.MISMATCH).padStart(6)} MISMATCH rule does not hold — every one is a hole\n\n`); + + const offs = details.filter((d) => d.verdict === "EXACT" && d.offset !== null && d.offset !== undefined); + if (offs.length) { + const tallyOff = new Map(); + for (const d of offs) tallyOff.set(d.offset, (tallyOff.get(d.offset) ?? 0) + 1); + const sorted = [...tallyOff.entries()].sort((x, y) => y[1] - x[1]); + process.stdout.write("placement (standalone index - host index, EXACT only):\n"); + for (const [o, c] of sorted) { + process.stdout.write(` ${String(o >= 0 ? "+" + o : o).padStart(5)} ${String(c).padStart(4)}` + + `${sorted.length === 1 ? " <- single placement; safe to emit" : ""}\n`); + } + if (sorted.length > 1) { + process.stdout.write( + " MORE THAN ONE PLACEMENT — a mitigation cannot pick an index that is\n" + + " right every time; emitting at the wrong one diverges the prefix even\n" + + " with byte-correct content.\n"); + } + process.stdout.write("\n"); + } + + const show = details.filter((d) => d.verdict !== "EXACT"); + if (show.length) { + process.stdout.write("non-EXACT occurrences:\n"); + for (const d of (verbose ? show : show.slice(0, 5))) { + process.stdout.write( + ` ${d.verdict.padEnd(8)} ${d.ts} host=${d.host} blocks=${d.blocks}` + + ` recon=${d.recon.length}ch actual=${d.text.length}ch${d.sub ? ` ${d.sub}` : ""}\n`); + if (d.verdict === "EXTENDED") { + const extra = extendedRemainder(d.recon, d.text); + process.stdout.write(` extra: ${JSON.stringify(extra.slice(0, 120))}\n`); + } + } + if (!verbose && show.length > 5) { + process.stdout.write(` ... ${show.length - 5} more (--verbose for all)\n`); + } + process.stdout.write("\n"); + } + process.stdout.write( + "verdict for a normalization built on the canonical rule:\n" + + (tally.MISMATCH > 0 + ? " DO NOT SHIP as-is — MISMATCH occurrences mean the canonical form differs\n" + + " from CC's own, so normalizing would move the bust rather than absorb it\n" + + " (threat matrix, Byte-match test).\n\n" + : ` the rule holds on every occurrence it applies to; EXTENDED cases are a\n` + + ` separate class and must be booked separately, never folded into the\n` + + ` absorbable claim.\n\n`)); + // The third answer, and it OVERRIDES the two above: a rule proven on the + // corpus this run could read says nothing about the captures it could not, + // and the unreadable ones are the largest — the likeliest to carry the class. + if (unreadable.length) { + process.stdout.write( + ` COULD NOT VERIFY over ${unreadable.length} of ${considered} capture(s) (listed above).\n` + + " This is NOT a clean byte-gate: treat the verdict as covering the read\n" + + " corpus only, and fix the read before shipping a normalization on it.\n\n"); + } + return unreadable.length ? 1 : 0; +} + +if (process.argv[1] && import.meta.url === `file://${process.argv[1]}`) { + if (process.argv.includes("--selftest")) { + const eq = (a, b, m) => { if (a !== b) throw new Error(`${m}: ${JSON.stringify(a)} != ${JSON.stringify(b)}`); }; + // canonical: strips wrappers, joins with a blank line + eq(canonical(["\nA\n\n", + "\nB\n"]), "A\n\nB", "canonical join"); + // an unwrapped block passes through untouched (never invent structure) + eq(canonical(["plain"]), "plain", "unwrapped passthrough"); + // classify's three verdicts, including the EXTENDED prefix rule + eq(classify("A", "A"), "EXACT", "exact"); + eq(classify("A", "A\n\nB"), "EXTENDED", "extended"); + eq(classify("A", "Z"), "MISMATCH", "mismatch"); + // EXTENDED must NOT be reported as EXACT — that conflation is what would + // let new-information cases inflate the absorbable population. + eq(classify("A", "AB") === "EXACT", false, "extended is not exact"); + // the EXTENDED remainder is the merged message, not the message plus glue + eq(extendedRemainder("A", "A\n\nB"), "B", "join stripped"); + eq(extendedRemainder("A", "AB"), "B", "no join to strip"); + // and it is MERGED only against what the PREDECESSOR already sent + eq(subclassifyExtended("A", "A\n\nB", ["B"]), "MERGED-STANDALONE", "merged"); + eq(subclassifyExtended("A", "A\n\nB", ["C"]), "NEW-TEXT", "not in predecessor"); + eq(subclassifyExtended("A", "A\n\nB", []), "NEW-TEXT", "no standalones, no merge"); + // reminderBlocks only picks trailing wrapped text, never the leading block + eq(reminderBlocks({ content: [{ type: "tool_result" }, + { type: "text", text: "\nX\n" }] }).length, + 1, "one trailing reminder"); + eq(reminderBlocks({ content: [{ type: "text", text: "\nX\n" }] }).length, + 0, "leading-only is not a host"); + eq(textOf({ content: "str" }), "str", "string content"); + // prunes: a drop whose retained prefix is byte-identical costs nothing; + // one whose retained prefix breaks re-bills from the breaking index. + const M = (t) => ({ role: "user", content: t }); // a human-typed turn + const T = (t) => ({ role: "user", content: [{ type: "tool_result", content: t }] }); + eq(classifyPrune([M("a"), M("b"), M("c")], [M("a"), M("b")]).kind, + "PURE-TAIL-PRUNE", "after is a prefix of before"); + eq(classifyPrune([M("a"), T("x"), M("live-old")], [M("a"), T("x"), M("live-new")]), + null, "same length is not a prune"); + // divergence AT the live turn: the turn the user is producing, not history + eq(classifyPrune([M("a"), T("x"), T("y"), M("old")], [M("a"), T("x"), M("new")]).kind, + "PURE-TAIL-PRUNE", "prune landing on the last human turn"); + // divergence BEFORE the live turn: settled history moved + const interior = classifyPrune([M("a"), T("x"), T("y"), M("live")], + [M("a"), T("CHANGED"), M("live")]); + eq(interior.kind, "INTERIOR-DIVERGENT", "retained history changed"); + eq(interior.div, 1, "breaks at 1"); + eq(interior.rebilled, 2, "re-bills from the break to the end"); + // no human turn at all: neither verdict is earned + eq(classifyPrune([T("a"), T("b"), T("c")], [T("a"), T("ZZ")]).kind, + "UNANCHORED", "no anchor, no verdict"); + eq(classifyPrune([M("a")], [M("a"), M("b")]), null, "growth is not a prune"); + process.stdout.write("reminder-migration-census: selftest passed\n"); + process.exit(0); + } + process.exit(await main(process.argv)); +} diff --git a/tools/replay.mjs b/tools/replay.mjs new file mode 100644 index 00000000..d84e3ff1 --- /dev/null +++ b/tools/replay.mjs @@ -0,0 +1,2555 @@ +#!/usr/bin/env node +// replay — run captured request bodies through the extension pipeline +// offline. Directive: docs/directives/proxy-request-capture-replay.md +// (stage 2). +// +// Usage: +// node tools/replay.mjs [--env FLAG=1 ...] [--json] +// +// Loads the extension pipeline exactly as server.mjs does (same loader, +// same extensions.json ordering), sets the given env flags, and feeds +// each captured body through runOnRequest in file order. State-writing +// extensions are pointed at a scratch CLAUDE_CONFIG_DIR so the live +// ~/.claude/cache-fix-snapshots is never touched. +// +// Per request it reports which extensions changed the body (measured by +// hashing the body between every pipeline stage — not by trusting +// telemetry) and the summary telemetry the pipeline itself emitted +// (insertion-normalization action and reset reason). +// +// Acceptance gate for a pipeline change (directive): replay the same +// corpus with the flag OFF and ON; the reports must differ only in the +// intended mutations. +// +// --- Cross-request byte stability (the self-inflicted-bust check) --- +// +// The per-request mutation report above answers "which extension changed +// THIS body". It cannot answer "did we forward the SAME bytes for the +// same message we already forwarded once" — and that second question is +// the one a cache bills. Three validators existed before this one and +// all three miss it: replay (post-pipeline, within ONE request), +// cache-sim (across requests, but PRE-pipeline — it never loads the +// pipeline at all), and output-guard (single-request invariants only). +// The empty cell is cross-request x post-pipeline. +// +// A bug that lived in exactly that cell shipped and billed real tokens: +// thinking-block-sanitize drops CC's omitted-thinking blocks from PRIOR +// assistant turns but preserves them on the LATEST turn when it is an +// active tool-continuation. So one byte-identical message is forwarded +// one way while it is the tail, another way once a turn lands after it +// — a mid-history mutation WE cause, every time such a turn ages out. +// Measured 2026-07-28 (session 58c979ce, 119k cc): CC's raw bytes at +// index 171 were identical across the pair; our output diverged there. +// +// The invariant, assumption-free (it needs no semantic identity of our +// own devising, which is what made the earlier probes unreliable): +// +// if CC's own bytes for the message sequence first diverge at index +// R, our forwarded bytes must not diverge before R. +// +// An output divergence EARLIER than the input divergence is ours by +// construction, and it is exactly what costs cache: the API keys on the +// longest byte-identical prefix, so moving the divergence point earlier +// re-writes everything from there. Attribution re-runs the pair one +// extension at a time and names the first stage that pulls the output +// divergence below R. +// +// Pairs are compared only within one key AND one conversation (same +// first message); co-tenant sidecar traffic sharing a session-id header +// is skipped rather than reported as churn (runbook's known artifact). + +import { mkdtemp, rm } from "node:fs/promises"; +import { tmpdir } from "node:os"; +import { join, dirname } from "node:path"; +import { fileURLToPath, pathToFileURL } from "node:url"; +import { createHash } from "node:crypto"; + +import { readLines } from "./read-lines.mjs"; +import { hashMessageContent } from "../proxy/extensions/message-hash.mjs"; +import { isClearArtifact } from "../proxy/extensions/fresh-session-sort.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const EXT_DIR = join(__dirname, "..", "proxy", "extensions"); +const EXT_CONFIG = join(__dirname, "..", "proxy", "extensions.json"); + +function sha(s) { + return createHash("sha256").update(s).digest("hex").slice(0, 12); +} + +// First index at which two message arrays differ byte-wise, or null when +// one is a pure prefix of the other (the append-only case: nothing that +// was already sent changed). +export function firstDivergence(a, b) { + const n = Math.min(a.length, b.length); + for (let i = 0; i < n; i++) { + if (JSON.stringify(a[i]) !== JSON.stringify(b[i])) return i; + } + return null; +} + +// Conversation identity. Co-tenant traffic (subagents, title-generation) +// shares the session-id header and therefore the capture key, but starts +// from a different first message. Comparing across those is the +// prefix-diff "sidecar churn" artifact, not a finding. +// +// Grouping on this — rather than only comparing ADJACENT capture lines — +// is load-bearing: live traffic interleaves tenants (main, subagent, +// sidecar), so two consecutive requests of the SAME conversation are +// usually several lines apart. An adjacent-only scan silently skips those +// pairs, which is exactly where the cache is won or lost. Measured while +// building this: adjacent-only found 0 violations on a full 602-request +// capture while a 40-request main-thread-only slice of the same session +// found 2 — the difference was entirely the interleaving, not the bytes. +// The identity itself is `conversationOf` below — the first message's byte +// hash, read off the compact entry rather than recomputed from the message. + +// The check itself. Entries are grouped by (capture key, conversation) and +// compared pairwise in arrival order WITHIN each group. A violation is an +// output divergence strictly earlier than the input's — except a divergence +// with a matching telemetry-keyed exemption (see freshSessionSortExemption +// below), which is reported separately by findStabilityExemptions rather +// than silently dropped. +function scanAllGroups(entries) { + const groups = new Map(); + for (const raw of entries) { + const e = asCompact(raw); + const cid = conversationOf(e); + if (cid === null) continue; + const g = `${e.key}|${cid}`; + if (!groups.has(g)) groups.set(g, []); + groups.get(g).push(e); + } + const violations = []; + const exemptions = []; + for (const group of groups.values()) { + const scanned = scanGroup(group); + violations.push(...scanned.violations); + exemptions.push(...scanned.exemptions); + } + return { + violations: violations.sort((a, b) => a.n - b.n), + exemptions: exemptions.sort((a, b) => a.n - b.n), + }; +} + +export function findStabilityViolations(entries) { + return scanAllGroups(entries).violations; +} + +// Exempted divergences, annotated with their basis — not silently dropped. +// See freshSessionSortExemption for the only exemption currently declared. +export function findStabilityExemptions(entries) { + return scanAllGroups(entries).exemptions; +} + +// Declared suppressions (insertion-normalization's pin-and-suppress, +// #76606 decision B) shrink the OUTPUT array by one entry, permanently, +// relative to CC's own raw array — every request from the first +// suppression on. `inHash`/`outHash` then no longer share a common index +// space: OUR array is one slot ahead of CC's from the suppressed index on, +// forever, so a plain positional compare reports a divergence exactly one +// index earlier than CC's own — every single turn — even though nothing +// extra was actually re-billed (the missing message is missing +// IDENTICALLY on both sides of the pair, so the shared prefix is exactly +// as long as it would be without the shift). Measured while adding this: +// UNADJUSTED, this pair's fix produced 67 new "violations" across a single +// conversation's remaining 60-odd turns, each showing the exact signature +// `outDiv === inDiv - 1` with CC identical at outDiv — a check firing on +// its own unadjusted index space, not a defect. +// +// Realign the reference: filter each entry's OWN suppressed indices out of +// its `inHash` before comparing, using the extension's own report +// (`stats.suppressions`) — never a re-derived guess — the same source +// safetyViolation's declared exemption already reads. +// Only the REMOVING suppressions shift the index space (see +// wireRemovedIndices): a join-move keeps its slot, filled with the re-served +// bytes, so filtering it here would over-correct by one and manufacture the +// very off-by-one signature this adjustment exists to remove. +function adjustedInHash(e) { + const removed = wireRemovedIndices(e.stats); + if (removed.size === 0) return e.inHash; + return e.inHash.filter((_, i) => !removed.has(i)); +} + +// fresh-session-sort's relocate branch reports what it did +// (ctx.meta.freshSessionSortStats, compactEntry's freshSessionSortStats): +// a first-appearance relocation deliberately prepends content to the +// message at `targetIndex` that CC never had there before — exactly the +// shape this check flags, by design (module doc at the top of this file, +// the s-58c979ce n=2024->2025 case). Exempt ONLY when: +// 1. the CURRENT entry (the one whose output changed) carries the +// telemetry at all, and +// 2. its targetIndex equals the violation's outDiv (the change landed +// exactly where the extension says it relocated to), and +// 3. at least one relocated block is reported as a first appearance. +// Never re-derived from outDiv/shape alone — mirrors suppressedIndices' +// "never a re-derived guess" discipline. A relocation reported WITHOUT +// telemetry (a stale build) or reported as a RECURRING (non-first- +// appearance) relocation both stay violations — the second guards against +// exempting a genuine repeat/thrash at the same index. +function freshSessionSortExemption(cur, outDiv) { + const stats = cur.freshSessionSortStats; + if (!stats || stats.targetIndex !== outDiv) return null; + const hit = (stats.relocated ?? []).find((r) => r.firstAppearance); + if (!hit) return null; + return { type: hit.type, targetIndex: stats.targetIndex }; +} + +function scanGroup(entries) { + const violations = []; + const exemptions = []; + for (let i = 1; i < entries.length; i++) { + const prev = entries[i - 1]; + const cur = entries[i]; + + // Per-message byte hashes, not the messages: firstDivergence compares + // JSON.stringify of each element, and stringifying a hash of the bytes + // yields the same first-difference index as stringifying the bytes. + const prevInHash = adjustedInHash(prev); + const curInHash = adjustedInHash(cur); + const inDiv = firstDivergence(prevInHash, curInHash); + const outDiv = firstDivergence(prev.outHash, cur.outHash); + // Input append-only (inDiv === null) sets the bar at "output must be + // append-only too": ANY output divergence is then self-inflicted. + const bar = inDiv === null ? Infinity : inDiv; + if (outDiv !== null && outDiv < bar) { + // Was CC's OWN byte at the index we diverged on identical across the + // pair? If yes the divergence is ours by construction — nothing + // upstream changed there — and no probe is needed to establish it. + // + // Hand-derived three times on 2026-07-28 (rows 21 and 22, plus the + // deferred-tool-rewrite pair), each time by writing a throwaway script + // to print in[i] and out[i] for both requests. The throwaway probe is + // the tell that a check is missing; both arrays are already in hand + // here, so the answer costs one comparison. + const ccSame = prevInHash[outDiv] === curInHash[outDiv]; + const record = { + n: cur.n, + prevN: prev.n, + ts: cur.ts, + key: cur.key, + inDiv, + outDiv, + // true => CC sent the same bytes there; the change is OURS. + // false => CC also changed that message; ours may be amplification. + ccIdenticalAtOutDiv: ccSame, + }; + const exemption = freshSessionSortExemption(cur, outDiv); + if (exemption) { + exemptions.push({ + ...record, + exemptReason: "fresh-session-sort:first-appearance-relocation", + exemptBasis: exemption, + }); + } else { + violations.push(record); + } + } + } + return { violations, exemptions }; +} + +// --- Safety invariants (always on) --- +// +// The stability check answers "did we cost cache". These answer "did we +// corrupt the conversation" — a different and strictly worse failure. The +// proxy's licence is to change BYTES, never the message sequence the model +// sees: same count, same roles, same order, tool_results still answering the +// tool_use immediately before them. +// +// This existed only as a throwaway probe during the 2026-07-28 session: every +// fix that day was verified by an ad-hoc script checking roles and length +// across 771 requests, and nothing in the tool itself would have caught a +// silent corruption. output-guard enforces comparable invariants on the LIVE +// path; replay — where the experimenting actually happens — enforced none. +// A message the proxy DECLARES it injected. deferred-tool-rewrite announces a +// newly-loaded tool with a {"role":"system"} message carrying a tool_addition +// block — the documented mid-conversation-tool-changes contract, and the whole +// point of holding tools[] stable. Counting that as corruption made the gate +// report 243 violations on a corpus where nothing was corrupted; a check that +// forbids a designed behaviour trains its reader to ignore it. +// +// Narrow on purpose: ONLY a system message whose content is entirely +// tool_addition blocks. Anything else appearing in messages[] is still a +// violation. +function isDeclaredInjection(msg) { + if (!msg || msg.role !== "system" || !Array.isArray(msg.content) || !msg.content.length) return false; + return msg.content.every((b) => b && b.type === "tool_addition"); +} + +// Per-entry, so it is evaluated as each request is replayed and nothing is +// retained. Exported on its own because the streaming caller wants one +// verdict at a time and findSafetyViolations wants the whole list — one +// implementation, two shapes, rather than a tested one and a shipped one. +// Declared SUPPRESSIONS (insertion-normalization's pin-and-suppress, +// #76606 decision B) are the mirror case of a declared injection: a +// message CC sent that the extension deliberately never forwards, because +// the pinned inline form at another position already carries its bytes. +// Filtered from the INPUT side only — there is nothing on the output side +// to filter, by definition, since the whole point is that it never +// appears there. The incoming index comes from the extension's OWN report +// (`stats.suppressions`, set by insertion-normalization's onRequest), +// never a re-derived "looks like a duplicate" guess — mirroring +// isDeclaredInjection's shape-based declaration with a telemetry-based one +// because a removed message, unlike an added one, carries no shape of its +// own to detect after the fact. +function suppressedIndices(stats) { + return new Set((stats?.suppressions ?? []).map((s) => s.index)); +} + +// Not every declared suppression REMOVES a message from the wire. A join-move +// suppression is a SUBSTITUTION: insertion-normalization forwards the +// re-served first-seen bytes in the merged message's own slot, so the array +// keeps its length and the index spaces stay aligned. Only the removing kind +// may be filtered out to realign them. +// +// The distinction is load-bearing in both directions, and getting it wrong is +// how the first build of the move failed: treating a substitution as a removal +// shortens the input by one against an output that never shrank, which reads +// as a role mismatch on every subsequent message. +function wireRemovedIndices(stats) { + return new Set((stats?.suppressions ?? []).filter((s) => s.kind !== "join-move").map((s) => s.index)); +} + +export function safetyViolation(e) { + // Declared injections are removed from BOTH sides before comparing. The + // filter was output-side only until 2026-07-29, which was correct while + // injections could only ever originate in our pipeline — but an input can + // carry an injection-shaped message too (a chained proxy feeding this + // pipeline its own output; the fable acceptance-probe capture is the live + // case). One-sided, the filter stripped the echoed injection from out and + // not from in, and the first census-enabled sweep failed a capture over a + // message nobody dropped — a check firing on a non-defect, found by + // rule-out-the-instrument within the hour. + const removed = wireRemovedIndices(e.stats); + const inM = e.inMsgs.filter((m, i) => !isDeclaredInjection(m) && !removed.has(i)); + const outM = e.outMsgs.filter((m) => !isDeclaredInjection(m)); + if (outM.length !== inM.length) { + return { n: e.n, ts: e.ts, kind: "length", detail: `${inM.length} -> ${outM.length}` }; + } + for (let i = 0; i < inM.length; i++) { + if (inM[i]?.role !== outM[i]?.role) { + return { + n: e.n, + ts: e.ts, + kind: "role", + detail: `idx ${i}: ${inM[i]?.role} -> ${outM[i]?.role}`, + }; + } + } + const adj = firstAdjacencyBreak(outM); + if (adj >= 0) return { n: e.n, ts: e.ts, kind: "tool-adjacency", detail: `idx ${adj}` }; + return null; +} + +export function findSafetyViolations(entries) { + const out = []; + for (const e of entries) { + const v = safetyViolation(e); + if (v) out.push(v); + } + return out; +} + +// A user message carrying tool_result blocks must be immediately preceded by +// the assistant message whose tool_use ids it answers. Mirrors the live +// extension's own invariant so replay fails the same way the proxy would. +function firstAdjacencyBreak(messages) { + for (let i = 0; i < messages.length; i++) { + const msg = messages[i]; + if (!msg || msg.role !== "user" || !Array.isArray(msg.content)) continue; + const ids = msg.content + .filter((b) => b && b.type === "tool_result" && typeof b.tool_use_id === "string") + .map((b) => b.tool_use_id); + if (!ids.length) continue; + const prev = messages[i - 1]; + if (!prev || prev.role !== "assistant" || !Array.isArray(prev.content)) return i; + const have = new Set( + prev.content.filter((b) => b && b.type === "tool_use" && typeof b.id === "string").map((b) => b.id), + ); + for (const id of ids) if (!have.has(id)) return i; + } + return -1; +} + +// --- Sequence invariants (always on) --- +// +// Pairwise checks miss the class that costs the most: a mitigation that +// "works" on the request where it fires and then bleeds on every request +// after. Measured 2026-07-28 — phase-2 insertion-normalization converts a +// mid-history splice into a tail append, which saves the prefix on THAT +// request and then resets forever after, because CC keeps sending the entry +// in its original position. Two requests looked like a win; three showed the +// truth. +// +// The invariant: once a conversation has been normalized, later requests must +// settle into append-only. A normalization followed by a RESET in the same +// conversation means our reconstruction and CC's serialization disagree, and +// that disagreement recurs for the life of the session. +export function findSequenceViolations(entries) { + const groups = new Map(); + for (const raw of entries) { + const e = asCompact(raw); + const cid = conversationOf(e); + if (cid === null) continue; + const g = `${e.key}|${cid}`; + if (!groups.has(g)) groups.set(g, []); + groups.get(g).push(e); + } + const out = []; + for (const group of groups.values()) { + let normalizedAt = null; + for (let i = 0; i < group.length; i++) { + const e = group[i]; + const act = e.action; + if (act === "normalized") normalizedAt = e.n; + else if (act === "reset" && normalizedAt !== null && e.resetReason !== "no-prior-canonical") { + // A reset is only OUR failure if CC's own history was append-only + // across the pair. When CC genuinely rewrote history, resetting is + // the correct response and flagging it is a check firing on a + // non-defect — which trains its reader to ignore the ones that + // matter. + // + // Same bar the stability gate already uses: `inDiv === null` means CC + // changed nothing that was already sent. Measured 2026-07-28 on + // capture s-538c0aef, request 109: CC replaced message 196 in place + // ("yes lest do it all!" -> "lets do it all 13.x shuodl be ..."), so + // reset(edit-shaped) was right and the sequence flag was noise. The + // real cost of that event — our bytes moving at 177 while CC's were + // identical — is the STABILITY gate's job, and it caught it. + const prev = group[i - 1]; + const ccRewrote = prev ? firstDivergence(prev.inHash, e.inHash) !== null : false; + if (!ccRewrote) { + out.push({ n: e.n, ts: e.ts, normalizedAt, reason: e.resetReason }); + } + normalizedAt = null; // report once per normalize/reset cycle + } + } + } + return out; +} + +// --- Census --- +// +// Classify what CC actually does to the message array between consecutive +// requests of one conversation, under SEMANTIC identity (decoration removed: +// volatile system-reminder blocks, cache_control, and the single-text-block +// <-> string shape flip). Everything that is not `append-only` is either a +// known threat-matrix row or an undiscovered class. +// +// This is the discovery instrument, and it earned its place: run over two +// real captures on 2026-07-28 it showed 94.5% of traffic is append-only once +// decoration is ignored — which shrank a planned "total reconciliation" +// rewrite down to one ordering fix — and it revealed that the shape-flip +// class lands predominantly on SYSTEM messages, catching a fix that had been +// written user-role-only and therefore fixed none of the real cases. +const VOLATILE_WRAP = /^\n[\s\S]*\n<\/system-reminder>\s*$/; + +function isVolatileTextBlock(b) { + return ( + b && + typeof b === "object" && + b.type === "text" && + typeof b.text === "string" && + (b.text === "" || VOLATILE_WRAP.test(b.text)) + ); +} + +// Model-visible content, decoration stripped. Single-text-block arrays and +// bare strings collapse to one form so a re-serialization is not mistaken for +// a different message. +export function semanticCore(msg) { + const c = msg?.content; + if (typeof c === "string") return [{ type: "text", text: c }]; + if (!Array.isArray(c)) return []; + const kept = []; + for (const b of c) { + if (isVolatileTextBlock(b)) continue; + if (b && typeof b === "object") { + const { cache_control, ...rest } = b; + kept.push(rest); + } else kept.push(b); + } + if (kept.length === 1 && kept[0]?.type === "text") return [{ type: "text", text: kept[0].text }]; + return kept; +} + +// Semantic identity WITH an occurrence ordinal, computed per array. +// +// Without the ordinal this collapsed repeats of the same message into one +// identity, and repeats are not rare: one measured history carried the +// recurring "The task tools haven't been used recently" reminder 44 times, +// byte-identical. Set- and index-based reasoning then treats 44 distinct +// entries as one, so a plain tail append can read as a mid-history splice. +// +// That is not a hypothetical either — it made findMitigationGaps report two +// `splice/insert-mid` misses on 2026-07-28 where the extension had correctly +// reported `append-only`. The extension was right and the census was wrong, +// because insertion-normalization's own `identityKey` is `hash|role|occurrence` +// and has carried the ordinal all along. This makes the two agree. +export function semanticIds(msgs) { + const seen = new Map(); + return msgs.map((m) => { + const base = `${m?.role ?? "?"}:${sha(JSON.stringify(semanticCore(m)))}`; + const o = seen.get(base) ?? 0; + seen.set(base, o + 1); + return `${base}#${o}`; + }); +} + +// --- Compact retention --- +// +// Streaming the READ was only half the problem. Every entry used to retain +// its full inMsgs and outMsgs, and since each request re-sends the whole +// history, that is the entire capture resident as objects: measured 3.2 GB +// peak on a 955 MB capture, which is within sight of V8's default old-space +// ceiling. The read no longer throws, but the wall had only moved. +// +// harvest.mjs already learned this and says so in its own comment ("retaining +// every parsed record turned a 555 MB capture into a 2.1 GB memory peak"). +// The lesson did not travel to its sibling — the tools were fixed one at a +// time, by whichever one happened to fall over. +// +// Nothing downstream actually wants the messages. Stability compares BYTES +// (a per-message hash decides every divergence index identically), census +// compares SEMANTIC IDS, trace reads only telemetry, and safety is per-entry +// so it never needed retention at all. So each entry keeps three string +// arrays instead of two message arrays. +// +// The checkers still accept full-message entries: the gate self-check builds +// them that way, and those tests are the safety net this refactor rests on. +// `asCompact` converts on the fly when it sees one, so both callers share one +// code path rather than one being tested and the other shipped. +// tools[] renders BEFORE system and messages, so a change to it invalidates +// the whole prefix and no breakpoint can survive one. Three fingerprints, +// because the distinction between them IS threat-matrix row 6's question: a +// pure ADDITION (membership grows, existing order preserved) is what +// Anthropic's docs say should not disturb the cache, while a REORDER of +// entries already present is a different event the docs do not cover. +export function toolsFingerprints(tools) { + if (!Array.isArray(tools)) return { sig: null, order: null, set: null, count: null, byName: null }; + const names = tools.map((t) => t?.name ?? "?"); + // Per-name hash, not the schema itself — same byte-conservation discipline + // as compactEntry's inHash/outHash. This is what lets heldStable (below) + // compare the SHARED-name subset of a pair without retaining either side's + // full tool bodies. + const byName = {}; + for (const t of tools) byName[t?.name ?? "?"] = sha(JSON.stringify(t)); + return { + sig: sha(JSON.stringify(tools)), // full schemas — catches a description edit + order: sha(JSON.stringify(names)), // names in wire order + set: sha(JSON.stringify([...names].sort())), // membership, order-blind + count: tools.length, + byName, + }; +} + +// Output-side identity for findMitigationGaps' outputForm/outputPreserved/ +// rebilledOutBytes ONLY. `outHash` below (used by the STABILITY check, +// `scanGroup`) stays byte-raw and untouched — byte-stability is the wire +// truth, and weakening it would let a real re-billed byte hide behind this +// strip. +// +// DEFINITION: cache_control designates a cache breakpoint, not conversation +// content. A pair of forwarded messages that differ ONLY in whether/where a +// cache_control block is attached carries identical model-visible bytes; +// counting that as a splice prices a cost nothing actually incurred. +// Measured (flap-probe, capture s-633915a8-...): CC itself sends an +// identical 32,140-char text as a cache_control-bearing block while it is +// the tail, then as a bare string once it is not, in its own pre-pipeline +// bytes (n=678->681 and four siblings: 564->565, 354->356, 267->268, +// 566->568 — deferredToolRewriteStats inert on all five, +// findStabilityViolations 0 on the whole capture — CC's own shape choice, +// not ours). `compactEntry`'s `outHash` (below) hashes raw +// `JSON.stringify(message)` with no strip, unlike the input-side identity +// path (`semanticCore`, above) — the same input-side blind-spot class, +// unfixed on the output side until now. +// +// Strips cache_control via the shared primitive (`hashMessageContent`, +// imported) — never a second hand-rolled variant, per dev-loop.md's "never +// hand-roll identity in a probe" — promoting bare-string content to the +// same single-block array form `semanticCore` already uses for the +// identical reason (a bare string and a one-block text array are the same +// message under any of this file's identity notions). Deliberately NOT +// `semanticCore`: that also drops volatile system-reminder blocks, a +// broader normalization this question does not ask for — only the +// cache_control removal mirrors "the input side" here. +function outputContentHash(m) { + const c = m?.content; + const content = typeof c === "string" ? [{ type: "text", text: c }] : Array.isArray(c) ? c : []; + return sha(JSON.stringify([m?.role ?? null, hashMessageContent({ content })])); +} + +export function compactEntry(e) { + const inMsgs = e.inMsgs ?? []; + const outMsgs = e.outMsgs ?? []; + return { + n: e.n, + ts: e.ts, + key: e.key, + inHash: inMsgs.map((m) => sha(JSON.stringify(m))), + // Byte length per message. Numbers, not content — this is what lets a + // missed mitigation be priced (everything from the divergence index on is + // re-billed) without retaining a single message body. + inBytes: inMsgs.map((m) => JSON.stringify(m).length), + // Index of the last HUMAN-TYPED message, computed here because compact + // entries carry no content. This is what turned row 4 from "mystery + // swaps" into "reminder re-stamping at the anchor" (2026-07-29: 20 of 22 + // human-anchored mid-history edits within +/-2 of this index) — the + // census could name WHAT and WHERE, but WHY needed the edit position + // related to conversation STRUCTURE, and that relation was derived by a + // throwaway script before it lived here. + inLastHuman: inMsgs.reduce((acc, m, i) => (isHumanTurn(m) ? i : acc), -1), + outHash: outMsgs.map((m) => sha(JSON.stringify(m))), + // cache_control-stripped twin of outHash, for findMitigationGaps' + // outputForm ONLY (see outputContentHash above) — never read by the + // stability check. + outHashSem: outMsgs.map(outputContentHash), + // Byte length per FORWARDED message, the output-side twin of inBytes — + // what lets rebilledOutBytes be priced without retaining a message body. + outBytes: outMsgs.map((m) => JSON.stringify(m).length), + inSem: semanticIds(inMsgs), + inBlocks: inMsgs.map(blockUnits), + msgs: inMsgs.length, + inTools: toolsFingerprints(e.inTools), + outTools: toolsFingerprints(e.outTools), + action: e.action ?? null, + resetReason: e.resetReason ?? null, + stats: e.stats ?? null, + // fresh-session-sort's own report of a relocation (telemetry-keyed + // exemption for the stability check below) — never re-derived from + // outHash shape, same discipline as `stats.suppressions`. + freshSessionSortStats: e.freshSessionSortStats ?? null, + }; +} + +// Threat-matrix row 6, asked of the corpus directly. +// +// The 175k event that opened the row carried TWO independent causes in one +// request — a tools reorder AND messages@165(user) — so it never established +// which invalidated the prefix. The row states what would settle it: a +// tools-only delta, i.e. tools changed while the message history did not. +// +// For every consecutive same-conversation pair this classifies the tools delta +// (none / addition-only / reorder / schema-edit / removal) against the message +// delta, and reports the pairs where tools moved and messages did not. It also +// records what WE forwarded, which is the other half — deferred-tool-rewrite +// exists to hold tools[] byte-stable across exactly these events, so an +// incoming change with an unchanged outgoing signature is the mitigation +// working, not a miss. +export function findToolsDeltas(entries) { + const groups = new Map(); + for (const raw of entries) { + const e = asCompact(raw); + const cid = conversationOf(e); + if (cid === null) continue; + const g = `${e.key}|${cid}`; + if (!groups.has(g)) groups.set(g, []); + groups.get(g).push(e); + } + const rows = []; + for (const group of groups.values()) { + for (let i = 1; i < group.length; i++) { + const p = group[i - 1]; + const c = group[i]; + if (p.inTools.sig === null || c.inTools.sig === null) continue; + if (p.inTools.sig === c.inTools.sig) continue; + // What KIND of tools change: membership vs order vs schema text. + let kind; + if (p.inTools.set !== c.inTools.set) { + kind = c.inTools.count > p.inTools.count ? "membership+" : "membership-"; + } else if (p.inTools.order !== c.inTools.order) { + kind = "reorder"; + } else { + kind = "schema-edit"; + } + const msgKind = censusIds(p.inSem, c.inSem); + // forwardedStable is a whole-array claim: a genuine new tool announced + // between p and c always moves the signature, so it reads "unstable" + // even when everything CC already knew about round-tripped untouched. + // heldStable narrows to what deferred-tool-rewrite actually guarantees + // — the SHARED-name subset (present on both sides) stays byte-stable — + // so a real addition is excluded from the comparison, not counted + // against it (BACKLOG "forwardedStable was a census framing gap"). + let heldStable; + if (p.outTools.byName === null || c.outTools.byName === null) { + heldStable = false; // no forwarded-tools data — same "not proven stable" stance as forwardedStable's null guard + } else { + const sharedNames = Object.keys(p.outTools.byName) + .filter((n) => Object.prototype.hasOwnProperty.call(c.outTools.byName, n)) + .sort(); + heldStable = sharedSig(p.outTools.byName, sharedNames) === sharedSig(c.outTools.byName, sharedNames); + } + rows.push({ + n: c.n, + prevN: p.n, + ts: c.ts, + kind, + msgKind, + // The isolating case row 6 asks for: tools moved, history did not. + toolsOnly: msgKind === "identical" || msgKind === "append-only", + forwardedStable: p.outTools.sig !== null && p.outTools.sig === c.outTools.sig, + heldStable, + count: `${p.inTools.count}->${c.inTools.count}`, + outCount: `${p.outTools.count}->${c.outTools.count}`, + }); + } + } + return rows.sort((a, b) => a.n - b.n); +} + +// heldStable's comparison, factored out: the byte signature of one side's +// tool bodies restricted to `names` (already the shared-name subset, +// pre-sorted by the caller so both sides hash in the same order). +const sharedSig = (byName, names) => sha(JSON.stringify(names.map((n) => byName[n]))); + +const asCompact = (e) => (e.inHash ? e : compactEntry(e)); + +// Conversation identity from the compact form: the first message's byte hash +// is exactly what conversationId hashed before. +// Exported: any tool comparing two requests of one conversation MUST use +// this identity rather than capture adjacency or index alignment. Both +// alternatives are silently wrong on interleaved traffic (see the note +// above), and a second tool restating the rule is how the two drift. +export const conversationOf = (e) => (e.inHash.length ? e.inHash[0] : null); + +// The threat-matrix coverage note ("hidden duplicate request", CC#78420, +// v2.1.209+) was answered 2026-07-29 by a throwaway python scan over raw +// capture bytes ("adjacent byte-identical bodies: one instance total ... +// across 3,446 requests in seven captures") — exactly the shape dev-loop.md +// calls the tell that a classification is missing from the tools. +// Mechanized here per BACKLOG's "Duplicate-request probe -> census check +// (Q1)" so the same falsifier re-answers on every sweep instead of being +// re-derived by hand. +// +// DEFINITION: a duplicate is an ADJACENT same-conversation pair whose +// incoming message arrays are byte-identical — same length, same +// per-message hash at every index (inHash, the raw wire-byte hash +// compactEntry already computes — unstripped, unlike the semantic ids +// censusIds uses elsewhere, because "byte-identical" is the wire claim +// #78420 makes). A genuine conversation turn always changes SOMETHING in +// the sent history (a new message, an edited tail); an unchanged array +// crossing the wire twice is a resend, not a turn. An empty array pair +// (no content sent) is excluded — it is not evidence of anything resent. +export function findDuplicateRequests(entries) { + const groups = new Map(); + for (const raw of entries) { + const e = asCompact(raw); + const cid = conversationOf(e); + if (cid === null) continue; + const g = `${e.key}|${cid}`; + if (!groups.has(g)) groups.set(g, []); + groups.get(g).push(e); + } + const rows = []; + for (const group of groups.values()) { + for (let i = 1; i < group.length; i++) { + const prev = group[i - 1]; + const cur = group[i]; + if (prev.inHash.length === 0 || prev.inHash.length !== cur.inHash.length) continue; + const identical = prev.inHash.every((h, idx) => h === cur.inHash[idx]); + if (!identical) continue; + rows.push({ n: cur.n, prevN: prev.n, ts: cur.ts, msgs: cur.inHash.length }); + } + } + return rows.sort((a, b) => a.n - b.n); +} + +export function censusPair(a, b) { + return censusIds(semanticIds(a), semanticIds(b)); +} + +// The classification itself, on semantic ids — what the compact entries carry. +export function censusIds(ia, ib) { + let p = 0; + while (p < Math.min(ia.length, ib.length) && ia[p] === ib[p]) p++; + if (p === ia.length) return p === ib.length ? "identical" : "append-only"; + const setA = new Set(ia); + const setB = new Set(ib); + const missing = ia.filter((h) => !setB.has(h)).length; + const added = ib.filter((h) => !setA.has(h)).length; + if (missing === 0 && added === 0) return "reorder-only"; + if (missing === 0 && added > 0) { + // Every prior entry survives and new ones appeared. Whether that is a + // mid-history SPLICE or a plain append hinges on where the new entries + // sit relative to the last surviving one — not on the divergence point + // `p`, which only says where the arrays stop agreeing positionally. + // (Comparing `p` against ia.length - 1 misfiled a splice one slot before + // the tail as an append; caught by the gate self-check.) + const lastKeptIn = ib.reduce((acc, h, j) => (setA.has(h) ? j : acc), -1); + const splicedAfterKept = ib.some((h, j) => !setA.has(h) && j < lastKeptIn); + return splicedAfterKept ? "splice/insert-mid" : "append-after-change"; + } + if (missing > 0 && added === 0) return "drop-only"; + return "replace/edit"; +} + +// --- State trace --- +// +// The verdict-level report (action, resetReason) says WHAT happened; this says +// what the extension BELIEVED at the time. That distinction found the +// append-vs-position defect: every downstream signal looked explicable, and +// the giveaway was a canonical grown to 92 entries for an 84-message history — +// state drifting from the wire, one entry per mid-history splice. +// +// Rendered per conversation in arrival order, because a state model is only +// legible as a sequence. Pairwise views cannot show accumulation, and the +// bug that motivated this was invisible in every pairwise view we had. +export function buildTrace(entries) { + const groups = new Map(); + for (const raw of entries) { + const e = asCompact(raw); + const cid = conversationOf(e); + if (cid === null) continue; + const g = `${e.key}|${cid}`; + if (!groups.has(g)) groups.set(g, []); + groups.get(g).push(e); + } + const out = []; + for (const [g, group] of groups) { + // One-request conversations have no state history worth showing. + if (group.length < 2) continue; + const rows = group.map((e) => { + const st = e.stats ?? {}; + // Canonical live-entry count should track the message count. A widening + // gap is the drift signal — flagged rather than left for the reader to + // notice. + const drift = st.canonLive != null && st.msgs != null ? st.canonLive - st.msgs : null; + return { + n: e.n, + ts: e.ts, + msgs: st.msgs ?? e.msgs, + action: st.action ?? null, + resetReason: st.resetReason ?? null, + canonSize: st.canonSize ?? null, + canonLive: st.canonLive ?? null, + drift, + inserted: st.inserted ?? 0, + pinned: st.pinned ?? 0, + dropped: st.dropped ?? 0, + }; + }); + out.push({ group: g, rows }); + } + return out; +} + +// --- Mitigation gaps: did we actually HELP, not just "not make it worse"? --- +// +// The gates ask whether we made things WORSE — output diverging earlier than +// CC's input, a corrupted sequence, content lost off the wire. They are all +// silent on the opposite failure: CC did something this proxy exists to +// absorb, and the extension declined to act. A reset forwards CC's bytes +// faithfully, so it is invisible to every gate while costing the full rewrite. +// +// That blind spot cost a real answer on 2026-07-28. A 484k `messages_changed` +// bust (event 14) had all four gates green, and establishing that we had NOT +// mitigated it took hand-reading extension telemetry. Fifteen seconds before +// the bust, insertion-normalization had reset with `not-subsequence`. +// +// Both halves of the answer already existed and nothing joined them: the +// census classifies what CC did, and the extension records per request whether +// it normalized or reset. This is the join. +// +// MITIGABLE is deliberately narrow — only classes this proxy claims to absorb. +// A `replace/edit` is an honest history rewrite (threat-matrix row 4/22) and +// `drop-only` is a prune; counting either as a miss would inflate the number +// with events no mitigation should touch. +const MITIGABLE = new Set(["splice/insert-mid", "append-after-change", "reorder-only"]); + +// `mitigated` above is an INPUT-side fact and nothing more: it trusts +// insertion-normalization's own self-report that it re-serialised CC's +// splice into an append, and prices the miss from CC's OWN divergence +// index (`prev.inHash` vs `cur.inHash`). It never looks at what we actually +// forwarded. That is a real, narrower claim than "the cache was preserved" — +// an extension can correctly stabilise the shared input prefix (earning +// `mitigated: true`, `rebilledBytes: 0`) and still choose to forward the +// new content by SPLICING it mid-array instead of appending it at the tail. +// The API keys its cache on the longest byte-identical PREFIX of the +// message array, so a mid-array splice moves that boundary earlier and +// re-bills everything after it — the exact cost `mitigated` claims was +// avoided. Measured: capture s-633915a8, pair n=26->28 — input-side +// `mitigated: true`, `rebilledBytes: 0`, while the forwarded array kept a +// byte-stable prefix through index 30 and then spliced a standalone system +// message in at index 31, re-billing everything from there (outcome record: +// cacheRead 15424 / cacheCreation 124025 — a splice/insert-mid signature on +// the WIRE, invisible to the input-only check). +// +// `outputForm` names that OUTPUT-side relation directly, reusing the same +// census primitive already used for input (`censusIds`/`firstDivergence`) +// against `outHash`/`outBytes` instead of `inHash`/`inBytes` — never a new +// notion of identity, per "never hand-roll identity in a probe": +// "append" — cur's forwarded array is a strict positional prefix +// extension of prev's (censusIds "identical" / +// "append-only"): nothing already sent moved position, so +// the cache's longest-identical-prefix boundary is +// unaffected. `outputPreserved` is exactly this case. +// "splice@N" — censusIds "splice/insert-mid" on the output arrays: every +// message we already forwarded still exists, but new +// content lands BEFORE the last surviving one, at index N — +// content shifted, cache broken from N on even though +// nothing was dropped. This is the class `mitigated: true` +// can hide, because insertion-normalization's own +// self-report is about the INPUT reconstruction, not about +// where the result got serialised in the output. +// "edit@N" — any other non-append output relation (reorder, drop, +// replace) with the output arrays first diverging at N, +// before the tail. +// `mitigated` keeps its existing input-side meaning unchanged; a pair can +// be `mitigated: true` and `outputPreserved: false` at once, and that +// combination — not `mitigated` alone — is what determines whether the +// cache was actually preserved. +export function findMitigationGaps(entries) { + const groups = new Map(); + for (const raw of entries) { + const e = asCompact(raw); + const cid = conversationOf(e); + if (cid === null) continue; + const g = `${e.key}|${cid}`; + if (!groups.has(g)) groups.set(g, []); + groups.get(g).push(e); + } + const rows = []; + for (const group of groups.values()) { + for (let i = 1; i < group.length; i++) { + const prev = group[i - 1]; + const cur = group[i]; + const kind = censusIds(prev.inSem, cur.inSem); + if (!MITIGABLE.has(kind)) continue; + // "normalized" is the only action that re-serialises the splice into an + // append. append-only and reset both forward CC's array as it came. + const mitigated = cur.action === "normalized"; + // What a passthrough costs: the cache keys on the longest identical + // prefix, so every message from CC's own divergence index onward is + // re-billed. + const inDiv = firstDivergence(prev.inHash, cur.inHash); + const from = inDiv === null ? cur.inBytes.length : inDiv; + const rebilled = cur.inBytes.slice(from).reduce((a, b) => a + b, 0); + + // Output-side classification — see the block comment above. Uses + // outHashSem (cache_control stripped, see outputContentHash), not the + // stability check's raw outHash — a cache_control-only relocation is + // not a content splice (outputContentHash's definitional comment). + const outKind = censusIds(prev.outHashSem, cur.outHashSem); + const outDiv = firstDivergence(prev.outHashSem, cur.outHashSem); + let outputForm; + if (outKind === "identical" || outKind === "append-only") { + outputForm = "append"; + } else if (outKind === "splice/insert-mid") { + outputForm = `splice@${outDiv}`; + } else { + outputForm = `edit@${outDiv}`; + } + const outputPreserved = outputForm === "append"; + const outFrom = outDiv === null ? cur.outBytes.length : outDiv; + const rebilledOutBytes = outputPreserved + ? 0 + : cur.outBytes.slice(outFrom).reduce((a, b) => a + b, 0); + + rows.push({ + n: cur.n, + prevN: prev.n, + ts: cur.ts, + kind, + mitigated, + action: cur.action, + resetReason: cur.resetReason, + rebilledBytes: mitigated ? 0 : rebilled, + outputForm, + outputPreserved, + rebilledOutBytes, + }); + } + } + return rows.sort((a, b) => b.rebilledBytes - a.rebilledBytes); +} + +// Where does a `replace/edit` actually land — the TAIL, or mid-history? +// +// Threat-matrix row 4 was closed on 2026-07-28 as ACCEPTED-cheap because every +// measured instance mutated the LAST message: CC appends content blocks into +// the final user message on an interruption, and a cache keys on the longest +// identical prefix, so rewriting the final message re-bills that message +// alone. A MID-history edit is a different animal — everything after it is +// re-billed — and the row says in as many words to re-open if a non-tail +// instance is ever measured. +// +// That verdict rested on census numbers taken BEFORE semanticIds carried an +// occurrence ordinal, and the ordinal changed the replace/edit population +// (16 -> 20 on one session). So the question needs asking mechanically rather +// than re-derived by hand each time the corpus moves. +// Local-only content excerpt for a flagged edit position. The census is +// content-blind by design (hashes scale and are publishable) — which is why +// row 4 sat unexplained while the bytes that named the mechanism were one +// read away. When the far-from-anchor tripwire fires, the human output now +// DELIVERS the evidence instead of leaving its extraction to a throwaway +// script. Stdout of a local run only: this never enters the JSON output, +// the gate status file, or anything committed. +export function excerptMessage(msg, cap = 180) { + if (!msg) return "(missing)"; + const c = msg.content; + let text = ""; + if (typeof c === "string") text = c; + else if (Array.isArray(c)) { + text = c + .map((b) => + b?.type === "text" ? b.text : b?.type ? `[${b.type}]` : "[?]", + ) + .join(" "); + } + const flat = text.replace(/\s+/g, " ").trim(); + return `${msg.role ?? "?"}: ${flat.length > cap ? flat.slice(0, cap) + "…" : flat || "(no text)"}`; +} + +// A message the human actually typed: user role carrying at least one text +// block that is neither a tool_result nor a tagged injection (reminders, +// notifications, caveats all start with "<"). Computed at compaction time +// because the census itself sees only hashes. +export function isHumanTurn(m) { + if (m?.role !== "user") return false; + const c = m.content; + if (typeof c === "string") return !c.trimStart().startsWith("<"); + if (!Array.isArray(c)) return false; + return c.some((b) => { + if (b?.type !== "text" || typeof b.text !== "string") return false; + const t = b.text.trimStart(); + return t.length > 0 && !t.startsWith("<"); + }); +} + +export function findEditPositions(entries) { + const groups = new Map(); + for (const raw of entries) { + const e = asCompact(raw); + const cid = conversationOf(e); + if (cid === null) continue; + const g = `${e.key}|${cid}`; + if (!groups.has(g)) groups.set(g, []); + groups.get(g).push(e); + } + const rows = []; + for (const group of groups.values()) { + for (let i = 1; i < group.length; i++) { + const prev = group[i - 1]; + const cur = group[i]; + if (censusIds(prev.inSem, cur.inSem) !== "replace/edit") continue; + // First position where the two histories stop agreeing semantically. + let at = 0; + const lim = Math.min(prev.inSem.length, cur.inSem.length); + while (at < lim && prev.inSem[at] === cur.inSem[at]) at++; + const lastIdx = cur.inSem.length - 1; + // Everything from the edit onward is re-billed. + const rebilled = cur.inBytes.slice(at).reduce((a, b) => a + b, 0); + rows.push({ + n: cur.n, + prevN: prev.n, + ts: cur.ts, + at, + lastIdx, + tail: at >= lastIdx, + rebilledBytes: rebilled, + // Structural context (see compactEntry's inLastHuman note): where the + // edit sits relative to the last human-typed message. anchorDelta 0 + // means the anchor message itself was re-stamped; small negative + // values are the injected-block zone just before it; null means no + // human turn exists (subagent/sidecar conversation). + lastHumanAt: cur.inLastHuman >= 0 ? cur.inLastHuman : null, + anchorDelta: cur.inLastHuman >= 0 ? at - cur.inLastHuman : null, + }); + } + } + return rows.sort((a, b) => b.rebilledBytes - a.rebilledBytes); +} + +// --- Block migration --- +// +// semanticIds/semanticCore reduce a message to a hash and, for a +// system-reminder-wrapped text block, drop it outright as decoration +// (isVolatileTextBlock) — correct for the ordinary case where a hook +// reminder is pure noise, and exactly what leaves census blind to the case +// where the same bytes are NOT noise: they leave one message's content array +// and reappear as a message of their own. That is the reminder-swap shape — +// measured directly in capture s-633915a8, +// n=26->28: message[30]'s 5th block, `\nPreToolUse:Edit +// hook additional context...\n`, is gone from message[30] +// on the n=28 side, and its inner text — wrapper stripped — is the entire +// content of the new message[31] (role system). +// +// DEFINITION: a block migration exists, for a same-conversation pair +// classified replace/edit or splice/insert-mid, when a content block present +// inside one message's content array on one side of the pair (PREV) is +// ABSENT from that message at the same position on the other side (CUR), +// while a message on CUR, within +/-3 indices of the block's index in PREV, +// carries that same block's bytes — either as the entirety of its content +// ("standalone") or as one block among several in its content array +// ("inline"). Identity of block bytes is the shared message-hash primitive's +// hashing (hashMessageContent, imported — never re-derived); a +// system-reminder wrapper is stripped before hashing on BOTH sides, because +// that is the one normalization already established in this file +// (semanticCore's VOLATILE_WRAP) for recognising the wrapper — undoing only +// the wrapper, not inventing a new comparison, is what keeps identity +// assumption-free. Direction is temporal, PREV(source) -> CUR(target): +// "inline->standalone" when the block sat among other blocks in PREV and +// stands alone in CUR; "standalone->inline" for the reverse. A block that is +// still present at the SAME position on the other side is not a migration — +// only its disappearance from that position is what makes the ±3 search +// meaningful. +// +// CANDIDACY (2026-07-30, measured on the real flap bytes — capture +// s-0d6f38ba pair n=102->104, fixture flap-s-0dc8ac87c43d-86.json): the block +// must appear -WRAPPED on whichever side it is INLINE. +// Without that condition the definition above over-reports, because both of +// its guards can be true of a block that never moved: +// +// PREV[92] user [tool_result, text( 720 chars)] +// CUR [93] user [tool_result] <- PREV[92] having SHED its reminder +// CUR [94] system "…" (683 chars) <- PREV[92]'s reminder, unwrapped +// +// Two messages were inserted above, so the host's own index moved and the +// same-position guard compares against an unrelated message; and `standalone` +// is `blocks.length === 1`, which a message that SHRANK to one block +// satisfies. So the tool_result was reported as migrating 92->93 when it had +// not left its message at all — the host had merely lost a neighbour and +// shifted. The census reported 6 migrations on this capture where 3 exist, +// and each phantom carried a `flap` tag, which is worse: a reader is being +// told two blocks oscillate when one does. The wrapper is what makes a block +// the decoration CC relocates, and it is the class this section names +// ("reminder-swap shape") — so requiring it narrows the check back to its +// own declared subject rather than adding a new rule. +const REMINDER_WRAP = /^\n([\s\S]*)\n<\/system-reminder>\s*$/; + +function unwrapReminder(block) { + if (block && typeof block === "object" && block.type === "text" && typeof block.text === "string") { + const m = REMINDER_WRAP.exec(block.text); + if (m) return { type: "text", text: m[1] }; + } + return block; +} + +// One identity unit per content block in a message. String content promotes +// to a single text block first (the same shape fold semanticCore does for +// bare-string messages), then each block is hashed via hashMessageContent — +// the shared primitive, applied to a one-block wrapper so it still strips +// only cache_control, nothing more. `standalone` records whether this unit IS +// the message's entire content (length 1), which is the "consisting of" half +// of the definition above — note it says nothing about WHY the message has +// one block, which is exactly why `wrapped` is needed beside it: `wrapped` +// records whether this block carried the wrapper before +// hashing, and it is the candidacy condition (see CANDIDACY above). +// `text` rides on the full form only, never on what compactEntry RETAINS: +// `inBlocks` keeps one of these per block of every request, and each request +// re-sends the whole history, so carrying the bytes there is the O(file) +// retention class this file has already paid for three times. The +// conservation gate below wants the text (a join is a concatenation, and +// hashes do not concatenate), and it runs per-request on live messages that +// become garbage at the end of the iteration — so it takes the full form and +// keeps nothing. One derivation, two projections, rather than a second notion +// of "the same block". +function blockUnitsFull(msg) { + const c = msg?.content; + let blocks; + if (typeof c === "string") blocks = [{ type: "text", text: c }]; + else if (Array.isArray(c)) blocks = c; + else return []; + return blocks + .map((b) => { + const unwrapped = unwrapReminder(b); + return { + hash: hashMessageContent({ content: [unwrapped] }), + wrapped: unwrapped !== b, + standalone: blocks.length === 1, + // The UNWRAPPED text, which is the unit a migration moves and a join + // concatenates. null for any non-text block (tool_result, tool_use, + // thinking, image) — those never participate in either shape. + text: unwrapped && unwrapped.type === "text" && typeof unwrapped.text === "string" ? unwrapped.text : null, + }; + }) + .filter((u) => u.hash !== null); +} + +function blockUnits(msg) { + return blockUnitsFull(msg).map(({ hash, wrapped, standalone }) => ({ hash, wrapped, standalone })); +} + +const BLOCK_MIGRATION_KINDS = new Set(["replace/edit", "splice/insert-mid"]); +const BLOCK_MIGRATION_WINDOW = 3; + +function scanBlockMigrations(prev, cur) { + const found = []; + for (let i = 0; i < prev.inBlocks.length; i++) { + const units = prev.inBlocks[i]; + if (units.length < 1) continue; + const inline = units.length >= 2; + const standalone = units.length === 1; + const samePos = new Set((i < cur.inBlocks.length ? cur.inBlocks[i] : []).map((d) => d.hash)); + for (const u of units) { + if (samePos.has(u.hash)) continue; // still there at the same position: not a migration + const lo = Math.max(0, i - BLOCK_MIGRATION_WINDOW); + const hi = Math.min(cur.inBlocks.length - 1, i + BLOCK_MIGRATION_WINDOW); + for (let j = lo; j <= hi; j++) { + const dstUnits = cur.inBlocks[j]; + if (!dstUnits || !dstUnits.length) continue; + // `hash` rides on the row because it is the only thing that says + // WHICH block moved — the flap scan below needs that identity and + // must not recompute one of its own (dev-loop: never hand-roll + // identity in a probe; the unit hash here IS hashMessageContent's). + // Candidacy, both directions: the block must be reminder-WRAPPED on + // its INLINE side — as the source unit when it is leaving a + // multi-block message, as the destination unit when it is joining + // one. Anything else alone in a message is a message that shed + // siblings, not a block that emerged. + if (inline && u.wrapped && dstUnits.some((d) => d.hash === u.hash && d.standalone)) { + found.push({ n: cur.n, prevN: prev.n, ts: cur.ts, direction: "inline->standalone", sourceIdx: i, targetIdx: j, hash: u.hash }); + break; + } + if (standalone && dstUnits.length >= 2 && dstUnits.some((d) => d.hash === u.hash && d.wrapped)) { + found.push({ n: cur.n, prevN: prev.n, ts: cur.ts, direction: "standalone->inline", sourceIdx: i, targetIdx: j, hash: u.hash }); + break; + } + } + } + } + return found; +} + +// --- Flap: a block migration that REVERSES a recent one --- +// +// A single migration is a one-way move and the volatile pin can absorb it. +// An OSCILLATION cannot be absorbed by a pin that classifies only one of the +// two shapes: the block keeps leaving and returning, so it busts on every +// second flip at best. That is what the 2026-07-30 221k event was (threat +// matrix row 4, session 0d6f38ba, n=102->104->105->108 in 11 seconds), and +// it was visible only by reading three adjacent census lines and noticing the +// direction column alternate — a hand-derivation, which is what this makes +// mechanical. +// +// DEFINITION: a block migration row R is a FLAP when an earlier row E exists +// such that (a) E and R are in the SAME conversation group — cache prefixes +// are per-conversation, so requests of any other conversation are not part of +// this clock; (b) E and R carry the same block bytes, meaning an identical +// block `hash` — the unit hash scanBlockMigrations already computed, never a +// second notion of sameness; (c) E.direction is the OPPOSITE of R.direction; +// (d) E and R are at most FLAP_WINDOW requests of that conversation apart, +// counted between their later (cur) sides, and at least 1 apart — two rows of +// the SAME pair are not a reversal over time, they are one moment. Only R is +// marked: the first leg of an oscillation is a plain migration until +// something reverses it, and R names the row it reverses so the pair reads +// off one line. +const FLAP_WINDOW = 5; + +function markFlaps(items) { + // `items` are {row, pos} for one conversation, in ascending pos (pos is the + // index of the row's cur entry within the conversation group), so the + // backward scan can stop as soon as the window is exceeded. + for (let i = 0; i < items.length; i++) { + const { row, pos } = items[i]; + for (let j = i - 1; j >= 0; j--) { + const span = pos - items[j].pos; + if (span > FLAP_WINDOW) break; + if (span < 1) continue; // same pair — one moment, not a reversal + const e = items[j].row; + if (e.hash !== row.hash || e.direction === row.direction) continue; + row.flap = { reversesPrevN: e.prevN, reversesN: e.n, span }; + break; + } + } +} + +const flapTag = (b) => + b.flap ? ` [flap reverses n=${b.flap.reversesPrevN}->${b.flap.reversesN}, ${b.flap.span} req]` : ""; + +export function findBlockMigrations(entries) { + const groups = new Map(); + for (const raw of entries) { + const e = asCompact(raw); + const cid = conversationOf(e); + if (cid === null) continue; + const g = `${e.key}|${cid}`; + if (!groups.has(g)) groups.set(g, []); + groups.get(g).push(e); + } + const rows = []; + for (const group of groups.values()) { + const inGroup = []; + for (let i = 1; i < group.length; i++) { + const prev = group[i - 1]; + const cur = group[i]; + const kind = censusIds(prev.inSem, cur.inSem); + if (!BLOCK_MIGRATION_KINDS.has(kind)) continue; + for (const row of scanBlockMigrations(prev, cur)) inGroup.push({ row, pos: i }); + } + markFlaps(inGroup); + for (const { row } of inGroup) rows.push(row); + } + return rows.sort((a, b) => a.n - b.n); +} + +export function runCensus(entries) { + const groups = new Map(); + for (const raw of entries) { + const e = asCompact(raw); + const cid = conversationOf(e); + if (cid === null) continue; + const g = `${e.key}|${cid}`; + if (!groups.has(g)) groups.set(g, []); + groups.get(g).push(e); + } + const tally = new Map(); + const examples = new Map(); + let pairs = 0; + for (const group of groups.values()) { + for (let i = 1; i < group.length; i++) { + const kind = censusIds(group[i - 1].inSem, group[i].inSem); + pairs++; + tally.set(kind, (tally.get(kind) ?? 0) + 1); + if (!examples.has(kind)) examples.set(kind, { n: group[i].n, prevN: group[i - 1].n, ts: group[i].ts }); + } + } + return { pairs, conversations: groups.size, tally, examples }; +} + +function parseArgs(argv) { + const args = { + file: null, + env: {}, + json: false, + census: false, + restartAt: null, + wipeStateAt: null, + trace: false, + gatesFromCapture: false, + }; + for (let i = 2; i < argv.length; i++) { + const a = argv[i]; + if (a === "--env") { + const kv = argv[++i] ?? ""; + const eq = kv.indexOf("="); + if (eq < 1) { + process.stderr.write(`bad --env value: ${kv} (want FLAG=value)\n`); + process.exit(2); + } + args.env[kv.slice(0, eq)] = kv.slice(eq + 1); + } else if (a === "--json") { + args.json = true; + } else if (a === "--census") { + args.census = true; + } else if (a === "--trace") { + args.trace = true; + } else if (a === "--gates-from-capture") { + args.gatesFromCapture = true; + } else if (a === "--restart-at" || a === "--wipe-state-at") { + const v = parseInt(argv[++i] ?? "", 10); + if (!Number.isFinite(v) || v < 1) { + process.stderr.write(`${a} wants a positive request index\n`); + process.exit(2); + } + if (a === "--restart-at") args.restartAt = v; + else args.wipeStateAt = v; + } else if (!args.file) { + args.file = a; + } else { + process.stderr.write(`unexpected argument: ${a}\n`); + process.exit(2); + } + } + if (!args.file) { + process.stderr.write( + "usage: node tools/replay.mjs [--env FLAG=1 ...] [--gates-from-capture] [--census] [--trace] [--restart-at N] [--wipe-state-at N] [--json]\n", + ); + process.exit(2); + } + return args; +} + +// Captures are read line-by-line, never slurped. One session's capture +// reaches ~1 GB — each request re-sends the whole history, so the file grows +// quadratically — and `readFile(f, "utf-8")` throws `RangeError: Invalid +// string length` once the file passes V8's max string size. That made the +// GATE unrunnable on exactly the largest and most interesting corpus, while +// staying green on every small one. Found 2026-07-28 by pointing it at a +// live 955 MB session capture. +// +// Conversation SUCCESSION — the census's cross-conversation blind spot, +// closed. Every within-conversation classifier above compares pairs INSIDE +// one conversation identity, so a boundary (compaction, resume, fork) +// structurally never forms a pair: the compaction note documented the blind +// spot, and the resume-exposure question was first answered by a throwaway +// probe — the tell, again, that a classification was missing. +// +// A SUCCESSION is an identity change where the earlier conversation never +// returns later in the capture; conversations that reappear are ordinary +// sidecar INTERLEAVING (hundreds per busy capture, the co-tenant normal) and +// are deliberately not reported — a boundary class that fired on every +// sidecar switch would train its reader to ignore it. Kinds: +// compaction/new-thread — opener <= 6 messages (summary or fresh start); +// resume-shaped — deep opener sharing >50% of message bodies with +// the predecessor (the CC#51764 family); +// fork/other — deep opener, low overlap: worth eyes. +// Each carries the opener's full byte size — a succession re-bills its +// whole prefix by construction. +export function findSuccessions(entries) { + const compact = entries.map(asCompact); + const lastSeen = new Map(); // conversation id -> last entry index + const firstSeen = new Map(); // conversation id -> first entry index + for (let i = 0; i < compact.length; i++) { + const cid = conversationOf(compact[i]); + if (cid === null) continue; + lastSeen.set(cid, i); + if (!firstSeen.has(cid)) firstSeen.set(cid, i); + } + const out = []; + for (let i = 1; i < compact.length; i++) { + const prev = compact[i - 1]; + const cur = compact[i]; + const prevCid = conversationOf(prev); + const curCid = conversationOf(cur); + if (prevCid === null || curCid === null || prevCid === curCid) continue; + if (lastSeen.get(prevCid) > i - 1) continue; // interleave: it returns + // The successor must be OPENING here: a one-shot sidecar handing back + // to a continuing main thread ends a conversation but starts nothing — + // without this condition every such handback minted a phantom + // "fork/other" (caught while writing the interleave bite). + if (firstSeen.get(curCid) !== i) continue; + const openerBytes = cur.inBytes.reduce((a, b) => a + b, 0); + let kind; + let shared = 0; + if (cur.msgs <= 6) { + kind = "compaction/new-thread"; + } else { + const prevHashes = new Set(prev.inHash); + shared = cur.inHash.filter((h) => prevHashes.has(h)).length; + kind = shared / cur.msgs > 0.5 ? "resume-shaped" : "fork/other"; + } + out.push({ + n: cur.n, + prevN: prev.n, + ts: cur.ts, + kind, + openerMsgs: cur.msgs, + shared, + rebilledBytes: openerBytes, + }); + } + return out; +} + +// --- Content conservation: the fifth gate --- +// +// NAME COLLISION, stated once so neither reader is misled: `classifyFidelity` +// below is REPLAY fidelity — "did this offline run reproduce the bytes the +// proxy really forwarded". This is CONTENT-conservation fidelity — "did the +// proxy forward every byte CC sent, or account for the ones it did not". The +// first is about the instrument, the second about the pipeline. The JSON key +// here is `conservation` for that reason; the four existing gates are +// untouched. +// +// WHY IT IS NEEDED. The four gates all ask a positional question: did our +// bytes move earlier than CC's, did we change the message sequence, did a +// normalize get followed by a reset, does canonical order track the wire. +// None of them can see a message CC sent that we simply never forwarded and +// whose content exists nowhere else — because a DELETION that leaves the +// surviving array positionally consistent is invisible to all four. The +// pin-and-suppress mechanism (#76606 decision B) deletes messages on purpose, +// and the mitigation this gate is a precondition for (a recognized reminder +// MOVE, served from its first-seen form) deletes one more. Safety outranks +// cache: a suppression whose copy is not actually on the wire is a silently +// truncated conversation, which is strictly worse than a cache miss. +// +// DEFINITION, written before any assertion (dev-loop "Adding a check"), for +// ONE request — CC's raw array R and the forwarded array F: +// +// R-side. Every content unit of a non-assistant message of R is either +// (a) present in F byte-identically (as the same unit, anywhere in F — +// the question is whether the content is still on the wire, not +// where), or +// (b) part of a DECLARED suppression (stats.suppressions, the +// extension's own report — never a re-derived "looks dropped" +// guess) whose content is RECONSTRUCTIBLE from F: its unwrapped +// bytes equal either a unit present in F, or the "\n\n" join of all +// volatile blocks of one message present in F (the merged-standalone +// shape, 78940a0). +// F-side. Every content unit of a non-assistant message of F is either +// (a) present in R, or +// (b) present in an EARLIER request of the same conversation — this is +// what "the pin forwards the FIRST-SEEN bytes" means, stated as a +// checkable property rather than trusted: a re-served byte must be a +// byte CC itself once sent here, and one we invented is red, or +// (c) a declared injection (isDeclaredInjection — deferred-tool-rewrite's +// tool_addition announcement, already exempt in the safety gate). +// +// POPULATION — non-assistant messages, and the reason is definitional rather +// than convenient. Every mechanism that can delete or re-serve content in +// this pipeline is confined to that population by construction: +// classifyPinned skips `e.r === "assistant"` before suppressing, and +// pinnedForwardForm returns the incoming message unchanged unless +// `stored.r === "user"`. Assistant content is transformed by a different and +// separately-gated class of extension. That class is not hypothetical — +// measured over 936 requests of four live captures (s-f3db21fa, s-2cd640f8, +// s-51c8511a, s-0d6f38ba) the ONLY blocks the pipeline does not conserve +// byte-identically are `assistant/tool_use` (rewritten in place by +// tool-input-normalize: 3,145 lost and 3,145 gained on s-0d6f38ba alone) and +// `assistant/thinking` (dropped by thinking sanitization); non-assistant +// blocks were conserved in every one of those requests. So the exclusion +// costs no coverage of THIS class and would otherwise fire on two declared +// behaviours with no telemetry to key an exemption on — a check firing on a +// non-defect, which trains its reader to ignore red. +// +// The residue is COUNTED and reported rather than silently dropped +// (`assistantResidue`): a reader can see how much this gate did not look at, +// which is the three-answer rule applied to a population boundary instead of +// to an empty corpus. +const CONSERVATION_JOIN = "\n\n"; + +function conservationUnits(msg) { + return blockUnitsFull(msg); +} + +// The "\n\n" join of ALL volatile (reminder-wrapped) blocks of one message, +// hashed the same way a single unit is. Mirrors the extension's own +// pinnedJoinHashes — same separator, same "all blocks of the entry, wire +// order, no subset merges" rule — but computed over the FORWARDED array, +// which is where a suppressed message's copy has to be for the suppression to +// have been honest. +function joinUnitHash(units) { + const texts = units.filter((u) => u.wrapped && u.text !== null).map((u) => u.text); + if (texts.length < 2) return null; + return hashMessageContent({ content: [{ type: "text", text: texts.join(CONSERVATION_JOIN) }] }); +} + +// The CROSS-MESSAGE join — the definition's "including as a join constituent" +// clause, and the shape the single-message join above cannot express. Measured +// (fixture flap-s-0dc8ac87c43d-86.json, request n=104, message 91): CC merged one +// message's reminder with the WHOLE of the standalone message that followed +// it, "\n\n"-joined, and sent the two as a single message. A copy of that +// message on the wire is therefore split across two forwarded messages, and is +// reconstructible only by reading them together. +// +// Restricted to ADJACENT forwarded messages, in wire order, reminder side +// first. That is the measured shape, and it is also what keeps this O(n) per +// request rather than O(n^2): pairing every forwarded message with every other +// would cost a million hashes on a thousand-message history to answer a +// question about one. +function crossJoinUnitHash(leftUnits, rightUnits) { + const left = leftUnits.filter((u) => u.wrapped && u.text !== null).map((u) => u.text); + if (!left.length) return null; + if (rightUnits.length !== 1 || rightUnits[0].text === null) return null; + const text = left.join(CONSERVATION_JOIN) + CONSERVATION_JOIN + rightUnits[0].text; + return hashMessageContent({ content: [{ type: "text", text }] }); +} + +const isAssistant = (m) => m?.role === "assistant"; + +// DECLARED TRANSFORM — the definition's clause (c), and the registry it names. +// fresh-session-sort deletes the echo a slash command leaves in the first user +// message (``, ``, `` +// — fresh-session-sort.mjs, "Strip /clear artifacts from first user message"). +// Those bytes really do leave the wire, and they are meant to: they are the +// harness quoting its own command back, never conversation content. +// +// Found by this gate rather than by reading: the first sweep reported 645 +// violations on capture s-633915a8, ALL of kind `lost`, ALL at message 0, and +// stage-by-stage replay of request 822 named the extension — RAW 6 units, +// after fresh-session-sort 3, the three removed being exactly a /compact +// caveat, its ``, and its ``. Left +// unexempted this would fail the daily sweep forever on a declared behaviour, +// which is the check-fires-on-a-non-defect failure that trains a reader to +// ignore red. +// +// The predicate is IMPORTED from the extension that performs the strip, never +// restated here: a second copy of "what counts as a clear artifact" is a +// second truth, and this file's own rule is to import an identity rather than +// re-derive it. Accepted residue, named because the exemption is slightly +// wider than the transform: the extension strips these blocks only from the +// first user message, while this exempts them wherever they appear. A +// harness-echo block elsewhere is not content either, so the widening cannot +// mask a conversation byte — but it is a widening, not an equality. +const isDeclaredStrip = (u) => u.text !== null && isClearArtifact(u.text); + +// Per-request verdict, `seen` being the per-conversation set of unit hashes CC +// has sent in ANY earlier request of this conversation. Per-entry for the same +// reason safetyViolation is: it runs in the replay loop where the messages are +// live and retains nothing but the verdict. `seen` is bounded by the +// conversation's own history (each request re-sends all of it, so the union +// converges on the largest request's block set) rather than by request count — +// the distinction that keeps this off the O(file) retention path. +export function conservationViolations(e, seen) { + const out = []; + const inMsgs = e.inMsgs ?? []; + const outMsgs = e.outMsgs ?? []; + const suppressed = suppressedIndices(e.stats); + + const fUnitsByMsg = outMsgs.map(conservationUnits); + const fHashes = new Set(); + for (const units of fUnitsByMsg) for (const u of units) fHashes.add(u.hash); + const fJoinHashes = new Set(); + for (let i = 0; i < fUnitsByMsg.length; i++) { + const j = joinUnitHash(fUnitsByMsg[i]); + if (j !== null) fJoinHashes.add(j); + if (i + 1 < fUnitsByMsg.length) { + const x = crossJoinUnitHash(fUnitsByMsg[i], fUnitsByMsg[i + 1]); + if (x !== null) fJoinHashes.add(x); + } + } + + const rHashes = new Set(); + let assistantResidue = 0; + for (let i = 0; i < inMsgs.length; i++) { + const msg = inMsgs[i]; + const units = conservationUnits(msg); + if (isAssistant(msg)) { + for (const u of units) if (!fHashes.has(u.hash)) assistantResidue++; + continue; + } + for (const u of units) rHashes.add(u.hash); + if (suppressed.has(i)) { + // A declared suppression must leave its content behind. Both matchable + // shapes are the extension's own: a per-block copy, or the merged join. + const unaccounted = units.filter((u) => !fHashes.has(u.hash) && !fJoinHashes.has(u.hash)); + if (unaccounted.length) { + out.push({ + n: e.n, + ts: e.ts, + kind: "suppressed-without-copy", + detail: `in[${i}] (${msg?.role}): ${unaccounted.length} of ${units.length} unit(s) reconstructible from neither a forwarded block nor a forwarded join`, + }); + } + continue; + } + const lost = units.filter((u) => !fHashes.has(u.hash) && !isDeclaredStrip(u)); + if (lost.length) { + out.push({ + n: e.n, + ts: e.ts, + kind: "lost", + detail: `in[${i}] (${msg?.role}): ${lost.length} of ${units.length} unit(s) present in CC's request and in no forwarded message`, + }); + } + } + + for (let i = 0; i < outMsgs.length; i++) { + const msg = outMsgs[i]; + if (isAssistant(msg) || isDeclaredInjection(msg)) continue; + const invented = fUnitsByMsg[i].filter((u) => !rHashes.has(u.hash) && !(seen && seen.has(u.hash))); + if (invented.length) { + out.push({ + n: e.n, + ts: e.ts, + kind: "invented", + detail: `out[${i}] (${msg?.role}): ${invented.length} of ${fUnitsByMsg[i].length} unit(s) CC never sent in this conversation`, + }); + } + } + + if (seen) for (const h of rHashes) seen.add(h); + return { violations: out, assistantResidue }; +} + +// Whole-corpus shape, grouped by conversation so `seen` means what the +// definition says — bytes CC sent EARLIER IN THIS CONVERSATION, never a +// co-tenant's. One implementation, two shapes (the streaming caller wants one +// verdict at a time), rather than a tested one and a shipped one. +export function findConservationViolations(entries) { + const seenByGroup = new Map(); + const out = []; + for (const raw of entries) { + const inMsgs = raw.inMsgs ?? []; + const cid = inMsgs.length ? sha(JSON.stringify(inMsgs[0])) : null; + if (cid === null) continue; + const g = `${raw.key}|${cid}`; + if (!seenByGroup.has(g)) seenByGroup.set(g, new Set()); + out.push(...conservationViolations(raw, seenByGroup.get(g)).violations); + } + return out.sort((a, b) => a.n - b.n); +} + +// Fidelity classification, pure so the population boundaries are testable. +// FIVE populations, never collapsed into one ratio: +// comparable/matched — unmutated with a recorded outSha; a mismatch +// here fails the gate (the replay is not +// reproducing the real request). +// mutatedComparable/-Matched — mutated with a recorded outSha; +// INFORMATIONAL ONLY, because state divergence +// makes a mismatch legitimate. On busy sessions +// every request is mutated, so this is the only +// fidelity signal there is. +// noOutcome — no outcome record at all (predates the feature, +// or no usage ever arrived). +// outcomeWithoutSha — outcome present but written by the pre-outSha +// recorder (14 such in one capture, all between +// the two 2026-07-28 restarts). Distinct from +// noOutcome because this population never shrinks +// by itself and must not read as "records +// missing, will fill in". +export function classifyFidelity(report, outcomes) { + const fidelity = { + comparable: 0, + matched: 0, + mutatedComparable: 0, + mutatedMatched: 0, + notComparableMutated: 0, // kept: gate-live and its consumers read this name + noOutcome: 0, + outcomeWithoutSha: 0, + mismatches: [], + }; + for (const e of report) { + if (e.error) continue; + const oc = outcomes.get(e.captureId); + if (!oc || !e.outBodySha) { + fidelity.noOutcome++; + continue; + } + if (!oc.outSha) { + fidelity.outcomeWithoutSha++; + continue; + } + if ((e.mutatedBy ?? []).length > 0) { + fidelity.notComparableMutated++; + fidelity.mutatedComparable++; + if (oc.outSha === e.outBodySha) fidelity.mutatedMatched++; + continue; + } + fidelity.comparable++; + if (oc.outSha === e.outBodySha) fidelity.matched++; + else fidelity.mismatches.push({ n: e.n, recorded: oc.outSha, replayed: e.outBodySha }); + } + return fidelity; +} + +// Blank lines are skipped WITHOUT consuming an index, matching the previous +// `.filter()` — `n` must keep the meaning that `--restart-at`, +// `--wipe-state-at` and every violation report already use. +// +// readLines, not readline.createInterface: the consumer awaits per request, +// and readline's push-based iterator buffers the entire remaining file during +// those awaits — measured 3.27 GB peak on a 1.5 GB capture while this +// function was called "streaming". tools/read-lines.mjs carries the measured +// failure and the bite test pinning the pull-based mechanism. +export async function* readCapture(path) { + let n = 0; + for await (const line of readLines(path)) { + if (!line.trim()) continue; + yield [n++, line]; + } +} + +// --gates-from-capture needs every boot record BEFORE loadExtensions runs +// (several extensions read their gate env at load or first-call time), but +// main()'s own `boots` array is only complete once the whole capture has +// been read — a chicken-and-egg the flag resolves with a lightweight +// PRE-pass: same pull-based reader as `readCapture` (never slurped, so this +// costs one extra streamed parse of the file, not a second copy of it in +// memory), keeping only the rare `type:"boot"` lines rather than every +// request body. +export async function readBootRecords(path) { + const boots = []; + for await (const line of readLines(path)) { + if (!line.trim()) continue; + let rec; + try { + rec = JSON.parse(line); + } catch { + continue; + } + if (rec.type === "boot") boots.push(rec); + } + return boots; +} + +// --- Gate provenance (BACKLOG.md: "replay warns on gateless runs of gated +// captures") --- +// +// A capture's boot record(s) name the CACHE_FIX_* gates the traffic was +// served under (buildBootRecord, proxy/extensions/request-capture.mjs). +// Replaying that capture under a DIFFERENT gate set compares two worlds and +// reports the difference as a finding — the same class of error +// gate-live.mjs's own comment documents for the daily sweep (extension +// defaults replayed against production's 11 gates, 0 violations vs 2 on the +// same corpus). Grounding for mechanizing rather than trusting prose here: +// the SAME operator-side instrument error happened three times in one day +// (2026-07-29 default-gates census), each time with the dev-loop warning +// already loaded. +// +// declaredGateEnv: union across every boot record in the capture, not just +// the first — a capture can span a restart under a different unit file, and +// any boot's declared gates are relevant to what the traffic after it saw. +// `CACHE_FIX_CAPTURE_MAX_MB` is capture retention, not a mitigation gate +// (excluded the same way the existing provenance printout already +// excludes it). Later boots win on VALUE (object insertion order tracks +// file order, since boots is built by streaming the capture forward) — the +// same rule `--gates-from-capture` (below) needs and `declaredGateNames` +// (names only, no values) did not. +export function declaredGateEnv(boots) { + const env = {}; + for (const b of boots ?? []) { + for (const [k, v] of Object.entries(b?.gates ?? {})) { + if (k !== "CACHE_FIX_CAPTURE_MAX_MB") env[k] = v; + } + } + return env; +} + +export function declaredGateNames(boots) { + return new Set(Object.keys(declaredGateEnv(boots))); +} + +// --gates-from-capture (BACKLOG.md: "and READY, the mechanized form: a +// --gates-from-capture replay flag applying the union"). The union's +// VALUES, not just its names, with explicit --env overrides winning +// per-key — the same combination `main()` used to hand-extract from a +// boot record and pass back in as `--env` flags, now mechanized so no +// operator does that by hand (the standing cause of the 2026-07-29 +// default-gates incidents, dev-loop.md "Replay the configuration that is +// SERVING"). Exported so a test asserts the SAME merge the CLI performs, +// never a re-derived one (dev-loop.md, "never hand-roll identity in a +// probe"). +export function resolveGatesFromCapture(boots, envOverrides) { + return { ...declaredGateEnv(boots), ...(envOverrides ?? {}) }; +} + +// Which of the declared gates are set in the effective replay env. "Set" +// mirrors buildBootRecord's own inclusion rule exactly — presence as an own +// key of the env object, any value — never a re-derived truthiness guess, +// so a --env override and an inherited process.env variable count +// identically, the same way they did when the boot record was written. +export function gateSourceSummary(boots, env) { + const declared = declaredGateNames(boots); + const set = [...declared].filter((k) => Object.prototype.hasOwnProperty.call(env ?? {}, k)); + return { + declaredCount: declared.size, + setCount: set.length, + // Only the NONE-set case warns; partial visibility (some but not all + // declared gates set) is a legitimate configuration (a --env override + // naming a subset) and is surfaced by the header stamp, not the + // warning. + warn: declared.size > 0 && set.length === 0, + }; +} + +export function formatGateSource({ declaredCount, setCount }) { + if (declaredCount === 0) return "no gates declared in capture"; + if (setCount === 0) return `none (capture declares ${declaredCount})`; + return `${setCount} of ${declaredCount} declared set`; +} + +async function main() { + const args = parseArgs(process.argv); + + // Scratch state dir BEFORE loading extensions: several read env at + // module scope is not the idiom here (all gates are read per-call), + // but claude-home is read per-call too — set it first anyway so no + // load-order surprise can leak a write to the live ~/.claude. + const scratch = await mkdtemp(join(tmpdir(), "cache-fix-replay-")); + process.env.CLAUDE_CONFIG_DIR = scratch; + // --gates-from-capture: resolve the capture's own ALL-BOOTS gate union + // (values, later boots winning) via a pre-pass BEFORE extensions load — + // the same merge point --env alone used, now with the capture as the + // base and --env as the override. Without the flag, behaviour is + // unchanged (args.env applied directly). See resolveGatesFromCapture. + const gateEnv = args.gatesFromCapture + ? resolveGatesFromCapture(await readBootRecords(args.file), args.env) + : args.env; + for (const [k, v] of Object.entries(gateEnv)) process.env[k] = v; + + const { loadExtensions, runOnRequest } = await import( + new URL("../proxy/pipeline.mjs", import.meta.url).href + ); + + let extensions = await loadExtensions(EXT_DIR, EXT_CONFIG); + + const report = []; + const stability = []; + const safety = []; + const conservation = []; + // Per-conversation first-seen registry for the conservation gate (see its + // DEFINITION). Hashes only, keyed by (capture key, conversation), so it is + // bounded by history size rather than by request count. + const conservationSeen = new Map(); + let conservationResidue = 0; + const outcomes = new Map(); + const boots = []; + + // `n` counts REQUEST records only. Outcome records (what the API charged) + // share the file but carry no body, and letting them consume an index would + // shift every request number — so --restart-at N and every violation report + // would silently point at the wrong request. + let reqN = -1; + for await (const [, line] of readCapture(args.file)) { + let rec; + try { + rec = JSON.parse(line); + } catch { + report.push({ n: reqN + 1, error: "unparseable capture line" }); + continue; + } + if (rec.type === "outcome") { + outcomes.set(rec.id, rec); + continue; + } + // Boot records mark a restart boundary and the gate set in force. They + // carry no body and must not consume a request index. + if (rec.type === "boot") { + boots.push({ afterRequest: reqN, ...rec }); + continue; + } + const n = ++reqN; + const body = structuredClone(rec.body); + // The capture record stores the session id under "session-id", but + // resolveSessionId (cache-telemetry) reads x-session-id / + // x-claude-code-session-id — reconstruct under a key it actually + // reads, or every extension keys by content-hash fallback and the + // replay silently loses session identity. + const headers = { + "anthropic-beta": rec.headers?.["anthropic-beta"] ?? undefined, + "x-session-id": rec.headers?.["session-id"] ?? rec.sid ?? undefined, + }; + const ctx = { body, headers, meta: { route: "messages" } }; + + // Restart transparency probe (threat-matrix row 3). Row 3 asserts a + // mid-session restart is OUR artifact rather than physics; this makes the + // claim testable offline instead of by restarting a live proxy and + // watching the bill. + // + // What a restart actually loses matters, and it is NOT the persisted + // state: insertion-normalization (saveCanonical) and + // deferred-tool-rewrite write their state to + // ~/.claude/cache-fix-snapshots and re-read it per request, so a fresh + // process finds it intact. Only MODULE-SCOPE memory dies — and re-loading + // the extension modules is exactly what this simulates: fresh module + // registry, same state directory, same corpus position. + // + // `--wipe-state-at` is the pessimistic sibling: state directory gone too, + // which models losing the snapshots rather than restarting the process. + // Keeping the two separate matters — conflating them measures a disaster + // and calls it a restart. + if (args.restartAt === n || args.wipeStateAt === n) { + if (args.wipeStateAt === n) await rm(scratch, { recursive: true, force: true }); + // loadExtensions cache-busts its imports per call (pipeline.mjs + // `_loadCounter`), so re-calling it gives genuinely fresh module scope + // — the same thing a new process gets. + extensions = await loadExtensions(EXT_DIR, EXT_CONFIG); + process.stderr.write( + `[replay] simulated ${args.wipeStateAt === n ? "state loss" : "proxy restart"} before request ${n}\n`, + ); + } + + // Measure per-extension mutation by hashing between stages: run the + // pipeline one extension at a time (same order — loadExtensions + // already sorted) instead of trusting each extension's telemetry. + const mutatedBy = []; + let prevHash = sha(JSON.stringify(ctx.body)); + for (const ext of extensions) { + if (!ext.onRequest) continue; + await runOnRequest(ctx, [ext]); + const h = sha(JSON.stringify(ctx.body)); + if (h !== prevHash) mutatedBy.push(ext.name); + prevHash = h; + } + + report.push({ + n, + ts: rec.ts, + key: rec.key, + captureId: rec.id ?? null, + // Hash of the body THIS replay produced, in the same form the proxy + // hashes what it forwards (JSON.stringify of the mutated body). + outBodySha: createHash("sha256").update(JSON.stringify(ctx.body)).digest("hex").slice(0, 16), + msgs: Array.isArray(rec.body?.messages) ? rec.body.messages.length : 0, + mutatedBy, + insertion: ctx.meta.insertionNormalizeStats ?? null, + outHash: prevHash, + }); + // Both sides of the stability check: what CC sent, and what we + // forwarded. `rec.body` was cloned before the pipeline ran, so it + // still holds the captured bytes. + const full = { + n, + ts: rec.ts, + key: rec.key, + inMsgs: Array.isArray(rec.body?.messages) ? rec.body.messages : [], + outMsgs: Array.isArray(ctx.body?.messages) ? ctx.body.messages : [], + // What CC sent vs what we forwarded — deferred-tool-rewrite's whole job + // is to make the second stable while the first moves (row 6). + inTools: rec.body?.tools, + outTools: ctx.body?.tools, + action: ctx.meta.insertionNormalizeStats?.action ?? null, + resetReason: ctx.meta.insertionNormalizeStats?.resetReason ?? null, + stats: ctx.meta.insertionNormalizeStats ?? null, + freshSessionSortStats: ctx.meta.freshSessionSortStats ?? null, + }; + // Safety is a per-request question, so answer it now and keep only the + // verdict; the messages become garbage as soon as this iteration ends. + const sv = safetyViolation(full); + if (sv) safety.push(sv); + // Content conservation is per-request too, but carries one piece of + // cross-request state: what CC has already sent in THIS conversation (the + // first-seen registry the pin re-serves from). Grouped on the same + // conversation identity every other checker uses — msgs[0]'s byte hash. + { + const cid = full.inMsgs.length ? sha(JSON.stringify(full.inMsgs[0])) : null; + if (cid !== null) { + const g = `${full.key}|${cid}`; + if (!conservationSeen.has(g)) conservationSeen.set(g, new Set()); + const cv = conservationViolations(full, conservationSeen.get(g)); + conservation.push(...cv.violations); + conservationResidue += cv.assistantResidue; + } + } + // Everything else keeps hashes, not bodies — see compactEntry. + stability.push(compactEntry(full)); + } + + // Gate provenance check — see the block comment above `declaredGateEnv`. + // `process.env` here already carries the `--env`/`--gates-from-capture` + // merge applied above (before extensions loaded), so it IS the effective + // replay env. + // Computed once, after the read loop (boots is only complete once the + // whole capture has been read), and printed once — not per request. + const gateSource = gateSourceSummary(boots, process.env); + if (gateSource.warn) { + process.stderr.write( + `WARNING: replaying under DEFAULT gates — this traffic was served with ${gateSource.declaredCount} gate(s). Pass --gates-from-capture, --env, or use gate-live.\n`, + ); + } + + // FIDELITY: did the replay actually reproduce what went on the wire? + // + // This gate rests on an assumption nothing has ever checked — that + // re-running the pipeline offline reproduces the bytes the proxy really + // forwarded. Captures are pre-pipeline by design, so the output was never + // recorded and the assumption was unfalsifiable. Outcome records now carry + // `outSha`, the hash of the actual outbound body, so the reconstruction can + // be compared against it. + // + // A mismatch does not mean the proxy misbehaved; it means the REPLAY is not + // modelling the proxy, and therefore that every verdict in this run is about + // a system that never ran. That is worth knowing loudly and is reported + // separately from the four invariant gates for exactly that reason. + // + // Scoped to requests NO EXTENSION MUTATED, and that scoping is the whole + // difference between a check and a permanently-red light. A replay starts + // from an empty state directory while the live proxy carried accumulated + // canonicals and tools baselines, so a MUTATED request legitimately differs + // from what went on the wire — measured 0/8 on a mid-session corpus even + // under the exact production gate set. Reporting that as failure would be a + // check firing on a non-defect, which trains its reader to ignore it. + // + // An UNMUTATED request has no such excuse: the proxy forwarded + // JSON.stringify(body) with nothing changed, and so did the replay. A + // mismatch there means the replay is not reproducing the real request, and + // every verdict in the run is about a different system. + // Three populations, reported separately and never collapsed into one + // ratio. "0/0" is indistinguishable from "checked and clean", which is the + // same absence-of-evidence-as-evidence-of-absence that let a broken --cold + // reader print "No cold rewrites recorded" over 26 real records. + // The mutated pair is INFORMATIONAL, never a gate: state divergence makes a + // mismatch there legitimate, so it cannot fail anything. It exists because + // on a busy session every request is mutated (insertion-normalization and + // tool-rewrite touch essentially all of them), so `comparable` can stay 0 + // forever on exactly the traffic that matters — measured across all nine + // captures of 2026-07-29's scheduled sweep. A high mutatedMatched says the + // replay's reconstruction converges on the real wire bytes anyway; a + // permanent 0/large would be the only available hint that it models a + // different system, downgraded to a hint precisely because it cannot be + // distinguished from honest state divergence. + const fidelity = classifyFidelity(report, outcomes); + + // Canonical order invariant, reported by the extension itself: reading live + // canonical entries in canonical order, their wire indices must be strictly + // increasing. This is the MECHANISM behind the reset classes, checked at the + // state model rather than inferred from a downstream reset three requests + // later. A size/drift statistic cannot substitute — a split adds one entry + // and one message, so counts stay equal while order diverges (bite-tested). + const orderViolations = stability + .filter((e) => e.stats?.canonOrderViolation) + .map((e) => ({ n: e.n, ts: e.ts, ...e.stats.canonOrderViolation })); + + const sequence = findSequenceViolations(stability); + const census = args.census ? runCensus(stability) : null; + // Self-describing: a census output should name what produced it without + // requiring the reader to cross-reference the boot record by hand. + if (census) census.gateSource = formatGateSource(gateSource); + const toolsDeltas = args.census ? findToolsDeltas(stability) : null; + const mitigation = args.census ? findMitigationGaps(stability) : null; + const edits = args.census ? findEditPositions(stability) : null; + const blockMigrations = args.census ? findBlockMigrations(stability) : null; + const successions = args.census ? findSuccessions(stability) : null; + const duplicateRequests = args.census ? findDuplicateRequests(stability) : null; + const trace = args.trace ? buildTrace(stability) : null; + + // Attribute each violation by replaying the corpus once per extension + // and asking which stage FIRST pulls the divergence below the bar. + // + // Naive attribution (re-run just the offending pair) does not work for + // stateful extensions: insertion-normalization, deferred-tool-rewrite and + // both carry per-session canonical state built by every request + // before this one, so a two-request replay puts them in a different state + // than the run that produced the violation, and they legitimately behave + // differently. That yields UNATTRIBUTED on exactly the stateful + // extensions most worth attributing — measured while building this. + // + // Instead: replay the whole corpus with the pipeline truncated after a + // given stage (cumulative prefix), and compare the same pair's outputs. + // "Does the violation appear by stage k" is MONOTONE in k — a prefix that + // produces it keeps producing it as later stages are added — so the first + // offending stage is found by BISECTION, not a linear scan: ~log2(35) ≈ 6 + // corpus replays instead of up to 35. Measured on the 602-request capture: + // 58s linear -> ~11s bisected, and the linear form was slow enough to blow + // a 2-minute command timeout mid-run. + // + // Only the replay COUNT is optimised; each replay is still a full-corpus, + // stateful run, which is what makes the attribution trustworthy. + const violations = findStabilityViolations(stability); + // Telemetry-keyed exemptions (fresh-session-sort's first-appearance + // relocations, currently the only declared one) — kept out of `violations` + // but reported alongside it, annotated with their basis, so an exempted + // divergence stays visible rather than silently dropped. + const exemptions = findStabilityExemptions(stability); + if (violations.length) { + const mutators = extensions.filter((e) => e.onRequest); + + // Replay the corpus through mutators[0..cut) and report, per violation, + // whether its output divergence has already dropped below the bar. + const replayThrough = async (cut) => { + const prefix = mutators.slice(0, cut); + const scratch2 = await mkdtemp(join(tmpdir(), "cache-fix-attr-")); + const savedHome = process.env.CLAUDE_CONFIG_DIR; + process.env.CLAUDE_CONFIG_DIR = scratch2; + const outs = new Map(); + const needed = new Set(violations.flatMap((v) => [v.prevN, v.n])); + let bReqN = -1; + for await (const [, line] of readCapture(args.file)) { + let rec; + try { + rec = JSON.parse(line); + } catch { + continue; + } + // Same numbering rule as the main loop — attribution replays must + // land on the same request indices the violations were reported in. + if (rec.type === "outcome" || rec.type === "boot") continue; + const n = ++bReqN; + const ctx = { + body: structuredClone(rec.body), + headers: { + "anthropic-beta": rec.headers?.["anthropic-beta"] ?? undefined, + "x-session-id": rec.headers?.["session-id"] ?? rec.sid ?? undefined, + }, + meta: { route: "messages" }, + }; + await runOnRequest(ctx, prefix); + // Every request must run (state), but only the pairs under + // investigation need their bodies retained. + if (needed.has(n)) outs.set(n, ctx.body.messages ?? []); + } + process.env.CLAUDE_CONFIG_DIR = savedHome; + await rm(scratch2, { recursive: true, force: true }); + const hit = new Map(); + for (const v of violations) { + const d = firstDivergence(outs.get(v.prevN) ?? [], outs.get(v.n) ?? []); + const bar = v.inDiv === null ? Infinity : v.inDiv; + hit.set(v.n, d !== null && d < bar ? d : null); + } + return hit; + }; + + // One bisection per violation would re-replay the corpus per violation; + // instead bisect once over the union and let each violation record the + // first cut at which it appears. Cache results by cut so repeated + // probes of the same depth are free. + const cache = new Map(); + const probe = async (cut) => { + if (!cache.has(cut)) cache.set(cut, await replayThrough(cut)); + return cache.get(cut); + }; + for (const v of violations) { + let lo = 1; + let hi = mutators.length; + if ((await probe(hi)).get(v.n) === null) { + v.attribution = null; // not reproducible through the full pipeline + continue; + } + while (lo < hi) { + const mid = Math.floor((lo + hi) / 2); + if ((await probe(mid)).get(v.n) !== null) hi = mid; + else lo = mid + 1; + } + v.attribution = { ext: mutators[lo - 1].name, outDiv: (await probe(lo)).get(v.n) }; + } + } + + if (args.json) { + process.stdout.write(JSON.stringify({ report, violations, exemptions, safety, conservation, conservationResidue, sequence, orderViolations, census, toolsDeltas, mitigation, edits, blockMigrations, successions, duplicateRequests, fidelity, boots, trace }, null, 2) + "\n"); + } else { + const counts = new Map(); + for (const r of report) { + for (const name of r.mutatedBy ?? []) counts.set(name, (counts.get(name) ?? 0) + 1); + } + process.stdout.write(`replayed ${report.length} requests from ${args.file}\n`); + if (boots.length) { + // Provenance the corpus now carries about itself: where the proxy + // restarted, and under which gates the traffic was recorded. Replaying + // under a DIFFERENT gate set is comparing two worlds — the mistake the + // gate runner made against production for a whole day. + process.stdout.write(`capture provenance: ${boots.length} proxy boot(s) in this corpus\n`); + for (const b of boots.slice(0, 4)) { + const on = Object.keys(b.gates ?? {}).filter((k) => k !== "CACHE_FIX_CAPTURE_MAX_MB").length; + process.stdout.write( + ` after request ${b.afterRequest} — pid ${b.pid}, tree ${b.proxyTree ?? "?"}, ${on} gate(s) — replay with --restart-at ${b.afterRequest + 1}\n`, + ); + } + } + process.stdout.write(`mutating extensions (requests touched):\n`); + for (const [name, c] of [...counts.entries()].sort((a, b) => b[1] - a[1])) { + process.stdout.write(` ${name}: ${c}\n`); + } + const resets = report.filter((r) => r.insertion?.action === "reset"); + process.stdout.write(`insertion-normalization resets: ${resets.length}\n`); + for (const r of resets.slice(0, 20)) { + process.stdout.write(` n=${r.n} ts=${r.ts} reason=${r.insertion.resetReason}\n`); + } + process.stdout.write( + `\ncross-request byte-stability violations (self-inflicted busts): ${violations.length}\n`, + ); + for (const v of violations.slice(0, 20)) { + const who = v.attribution ? `${v.attribution.ext} (outDiv=${v.attribution.outDiv})` : "UNATTRIBUTED"; + process.stdout.write( + // prevN is NOT optional detail. Pairs are compared within a + // CONVERSATION, so the predecessor is usually not the previous capture + // line — printing only `n` invites the reader to diff n-1 against n, + // a different pair and often unrelated traffic. Cost exactly that + // mistake once (2026-07-28): the violating pair was 44->47, the probe + // compared 46->47, and the two requests it diffed were different + // subagent conversations that looked like wholesale corruption. The + // JSON carried prevN the whole time; the human line did not. + ` n=${v.prevN}->${v.n} ts=${v.ts} inDiv=${v.inDiv ?? "append-only"} outDiv=${v.outDiv}` + + `${v.ccIdenticalAtOutDiv ? " [CC bytes at outDiv IDENTICAL -> ours]" : " [CC also changed outDiv]"}` + + ` <- ${who}\n`, + ); + } + + // Exempted, not silently dropped: same divergence shape as a violation + // above, but the extension's own telemetry accounts for it (currently + // only fresh-session-sort's first-appearance relocations). + process.stdout.write(`\nstability exemptions (telemetry-backed, not counted as violations): ${exemptions.length}\n`); + for (const x of exemptions.slice(0, 20)) { + process.stdout.write( + ` n=${x.prevN}->${x.n} ts=${x.ts} inDiv=${x.inDiv ?? "append-only"} outDiv=${x.outDiv}` + + ` <- ${x.exemptReason} (${x.exemptBasis.type})\n`, + ); + } + + process.stdout.write(`\ncanonical order violations (state model vs wire): ${orderViolations.length}\n`); + for (const o of orderViolations.slice(0, 20)) { + process.stdout.write( + ` n=${o.n} ts=${o.ts} canon#${o.at} sits at wire ${o.wireIdx} after wire ${o.prevWireIdx}\n`, + ); + } + + process.stdout.write(`\nsafety violations (conversation corrupted): ${safety.length}\n`); + for (const s of safety.slice(0, 20)) { + process.stdout.write(` n=${s.n} ts=${s.ts} ${s.kind}: ${s.detail}\n`); + } + + process.stdout.write( + `\ncontent-conservation violations (CC bytes neither forwarded nor accounted for): ${conservation.length}\n`, + ); + for (const c of conservation.slice(0, 20)) { + process.stdout.write(` n=${c.n} ts=${c.ts} ${c.kind}: ${c.detail}\n`); + } + // The population boundary, said out loud rather than left implicit: this + // gate looks at non-assistant messages only (see its DEFINITION), and + // this is how much it therefore did not look at. + process.stdout.write( + ` not examined: ${conservationResidue} assistant-role block(s) the pipeline rewrote or dropped (tool_use normalization, thinking sanitization — a separately-gated class)\n`, + ); + + process.stdout.write(`\nsequence violations (normalize then reset): ${sequence.length}\n`); + for (const s of sequence.slice(0, 20)) { + process.stdout.write(` n=${s.n} ts=${s.ts} reset(${s.reason}) after normalize at n=${s.normalizedAt}\n`); + } + + if (trace) { + for (const { group, rows } of trace) { + process.stdout.write(`\nstate trace — ${group} (${rows.length} requests)\n`); + process.stdout.write(` ${"n".padStart(5)} ${"msgs".padStart(5)} ${"canon".padStart(6)} ${"live".padStart(5)} ${"drift".padStart(6)} action\n`); + for (const r of rows) { + const flag = r.drift !== null && r.drift !== 0 ? " <<<" : ""; + const act = r.action === "reset" ? `reset/${r.resetReason}` : (r.action ?? "-"); + const extra = r.pinned || r.dropped || r.inserted + ? ` (ins=${r.inserted} pin=${r.pinned} drop=${r.dropped})` + : ""; + process.stdout.write( + ` ${String(r.n).padStart(5)} ${String(r.msgs).padStart(5)} ` + + `${String(r.canonSize ?? "-").padStart(6)} ${String(r.canonLive ?? "-").padStart(5)} ` + + `${String(r.drift ?? "-").padStart(6)} ${act}${extra}${flag}\n`, + ); + } + } + } + + if (census) { + process.stdout.write( + `\ncensus: ${census.pairs} same-conversation pairs across ${census.conversations} conversations\n`, + ); + process.stdout.write(` gates: ${census.gateSource}\n`); + const total = census.pairs || 1; + for (const [kind, c] of [...census.tally.entries()].sort((a, b) => b[1] - a[1])) { + const ex = census.examples.get(kind); + const pct = ((100 * c) / total).toFixed(1).padStart(5); + const where = kind === "append-only" || kind === "identical" ? "" : ` e.g. n=${ex.prevN}->${ex.n}`; + process.stdout.write(` ${String(c).padStart(5)} ${pct}% ${kind}${where}\n`); + } + } + { + const bad = fidelity.mismatches.length; + process.stdout.write( + `\nreplay fidelity: ${fidelity.matched}/${fidelity.comparable} comparable` + + ` | ${fidelity.notComparableMutated} mutated (replay starts from empty state)` + + ` | ${fidelity.noOutcome} without an outcome record` + + (fidelity.outcomeWithoutSha + ? ` | ${fidelity.outcomeWithoutSha} outcome predates outSha` + : "") + + "\n", + ); + if (fidelity.mutatedComparable > 0) { + // Informational: a mutated mismatch is legitimate (state divergence), + // so this can never fail anything — but on busy sessions it is the + // only fidelity signal there is, since every request is mutated. + process.stdout.write( + ` mutated, informational: ${fidelity.mutatedMatched}/${fidelity.mutatedComparable} reconstruction matched the wire\n`, + ); + } + if (fidelity.comparable === 0) { + process.stdout.write( + ` NOTHING COMPARABLE — this run proves nothing about replay fidelity.` + + `${fidelity.noOutcome ? " Outcome records are missing; they are written from proxy tree 8a0d995 onward." : ""}\n`, + ); + } + if (bad) { + process.stdout.write( + ` ${bad} MISMATCH on requests no extension touched — the replay is not reproducing the real request,\n` + + ` so every other verdict in this run describes a different system\n`, + ); + for (const m of fidelity.mismatches.slice(0, 5)) { + process.stdout.write(` n=${m.n} recorded=${m.recorded} replayed=${m.replayed}\n`); + } + } + } + if (edits && edits.length) { + // Threat-matrix row 4: tail edits are cheap, mid-history edits are not. + const mid = edits.filter((e) => !e.tail); + process.stdout.write( + `\nreplace/edit positions: ${edits.length} total, ${edits.length - mid.length} TAIL, ${mid.length} MID-HISTORY\n`, + ); + const midBytes = mid.reduce((a, e) => a + e.rebilledBytes, 0); + if (mid.length) { + process.stdout.write(` mid-history re-bills ~${(midBytes / 1e6).toFixed(1)} MB — row 4 says RE-OPEN on any of these\n`); + for (const e of mid.slice(0, 6)) { + const anchor = + e.anchorDelta === null ? "no-human-anchor" : `anchor${e.anchorDelta >= 0 ? "+" : ""}${e.anchorDelta}`; + // blockMigration rides beside anchorDelta: same n/prevN pair, source + // index within the edit's neighbourhood — the reminder-swap shape + // the anchor alone cannot name. + const bm = (blockMigrations ?? []).filter((b) => b.n === e.n && b.prevN === e.prevN); + const bmTag = bm.length + ? " " + bm.map((b) => `[blockMigration ${b.direction} ${b.sourceIdx}->${b.targetIdx}]${flapTag(b)}`).join(" ") + : ""; + process.stdout.write( + ` n=${e.prevN}->${e.n} edit@${e.at} of ${e.lastIdx} [${anchor}]${bmTag} ~${(e.rebilledBytes / 1e3).toFixed(0)} kB ${e.ts}\n`, + ); + } + // The measured norm (2026-07-29): edits cluster at the anchor. An + // edit FAR from any anchor would be a NEW mechanism, worth a look — + // so deliver the bytes with the flag (LOCAL stdout only; the class + // was only ever named by reading content, and extraction friction is + // what let row 4 sit unexplained for a day). + const far = mid.filter((e) => e.anchorDelta !== null && Math.abs(e.anchorDelta) > 30); + if (far.length) { + process.stdout.write( + ` ${far.length} edit(s) >30 from the human anchor — NOT the known reminder-anchoring class:\n`, + ); + const want = new Map(); // request index -> [{at, side, rowKey}] + for (const e of far.slice(0, 3)) { + if (!want.has(e.prevN)) want.set(e.prevN, []); + if (!want.has(e.n)) want.set(e.n, []); + want.get(e.prevN).push({ at: e.at, label: `n=${e.prevN} (before)` }); + want.get(e.n).push({ at: e.at, label: `n=${e.n} (after)` }); + } + for await (const [idx, line] of readCapture(args.file)) { + const asks = want.get(idx); + if (!asks) continue; + let body; + try { + body = JSON.parse(line).body; + } catch { + continue; + } + for (const a of asks) { + process.stdout.write(` @${a.at} ${a.label} ${excerptMessage(body?.messages?.[a.at])}\n`); + } + want.delete(idx); + if (want.size === 0) break; + } + } + } + } + if (blockMigrations && blockMigrations.length) { + const flaps = blockMigrations.filter((b) => b.flap); + process.stdout.write( + `\nblock migrations (reminder-swap shape): ${blockMigrations.length}, ${flaps.length} FLAP\n`, + ); + if (flaps.length) { + process.stdout.write( + ` a FLAP reverses a migration of the SAME block within ${FLAP_WINDOW} requests of one conversation —\n` + + ` a pin that classifies only one of the two shapes absorbs one leg, so an oscillation busts on\n` + + ` every second flip at best (threat matrix row 4, 2026-07-30)\n`, + ); + // Flaps first, so the truncation below can never drop them: the whole + // point is that they were previously findable only by reading adjacent + // lines and noticing the direction column alternate. + for (const b of flaps.slice(0, 10)) { + process.stdout.write( + ` n=${b.prevN}->${b.n} ${b.direction} ${b.sourceIdx}->${b.targetIdx}${flapTag(b)} ${b.ts}\n`, + ); + } + } + for (const b of blockMigrations.filter((r) => !r.flap).slice(0, 10)) { + process.stdout.write( + ` n=${b.prevN}->${b.n} ${b.direction} ${b.sourceIdx}->${b.targetIdx}${flapTag(b)} ${b.ts}\n`, + ); + } + } + if (mitigation) { + // The question the four gates cannot ask: of the events this proxy + // exists to absorb, how many did it actually absorb? + const total = mitigation.length; + const hit = mitigation.filter((m) => m.mitigated).length; + const pct = total ? ((100 * hit) / total).toFixed(0) : "--"; + process.stdout.write(`\nmitigation: ${hit}/${total} mitigable events absorbed (${pct}%)\n`); + // `mitigated` is input-side only (see the definitional comment on + // findMitigationGaps) — a pair can pass it and still splice on the + // OUTPUT, moving the cache's prefix boundary earlier than the input + // check ever sees. Flagged separately from the "missed" list below + // because these pairs are NOT misses by the input-side count. + const inputMitigatedOutputSpliced = mitigation.filter( + (m) => m.mitigated && !m.outputPreserved, + ); + if (inputMitigatedOutputSpliced.length) { + process.stdout.write( + ` ${inputMitigatedOutputSpliced.length} pair(s) input-mitigated but NOT output-preserved:\n`, + ); + for (const m of inputMitigatedOutputSpliced) { + process.stdout.write( + ` n=${m.prevN}->${m.n} ${m.kind} ${m.outputForm} [INPUT-MITIGATED, OUTPUT-SPLICED] ~${(m.rebilledOutBytes / 1e3).toFixed(0)} kB ${m.ts}\n`, + ); + } + } + if (total > hit) { + const missedBytes = mitigation.reduce((a, m) => a + m.rebilledBytes, 0); + process.stdout.write(` passed through: ~${(missedBytes / 1e6).toFixed(1)} MB re-billed\n`); + const byReason = new Map(); + for (const m of mitigation) { + if (m.mitigated) continue; + const k = m.resetReason ? `reset(${m.resetReason})` : m.action; + const cur = byReason.get(k) ?? { n: 0, bytes: 0 }; + cur.n++; + cur.bytes += m.rebilledBytes; + byReason.set(k, cur); + } + for (const [k, v] of [...byReason.entries()].sort((a, b) => b[1].bytes - a[1].bytes)) { + process.stdout.write(` ${String(v.n).padStart(5)} ${k} — ~${(v.bytes / 1e6).toFixed(1)} MB\n`); + } + for (const m of mitigation.filter((x) => !x.mitigated).slice(0, 5)) { + // blockMigration beside the mitigation row for the same reason it + // rides beside anchorDelta on edit rows: splice/insert-mid is where + // the reminder-swap shape actually lands (n=26->28 is a splice, not + // a replace/edit, so it never reaches the edits-array printout). + const bm = (blockMigrations ?? []).filter((b) => b.n === m.n && b.prevN === m.prevN); + const bmTag = bm.length + ? " " + bm.map((b) => `[blockMigration ${b.direction} ${b.sourceIdx}->${b.targetIdx}]`).join(" ") + : ""; + process.stdout.write( + ` n=${m.prevN}->${m.n} ${m.kind} ${m.resetReason ? `reset(${m.resetReason})` : m.action}${bmTag} ~${(m.rebilledBytes / 1e3).toFixed(0)} kB ${m.ts}\n`, + ); + } + } + } + if (toolsDeltas) { + // Threat-matrix row 6. `tools-only` is the isolating case the row asks + // for: tools[] moved while the message history did not, so nothing else + // could have invalidated the prefix. + const only = toolsDeltas.filter((d) => d.toolsOnly); + process.stdout.write(`\ntools[] deltas: ${toolsDeltas.length} (${only.length} tools-ONLY)\n`); + const byKind = new Map(); + for (const d of toolsDeltas) { + const k = `${d.kind}${d.toolsOnly ? " [tools-only]" : ` +${d.msgKind}`}`; + byKind.set(k, (byKind.get(k) ?? 0) + 1); + } + for (const [k, c] of [...byKind.entries()].sort((a, b) => b[1] - a[1])) { + process.stdout.write(` ${String(c).padStart(5)} ${k}\n`); + } + const leaked = toolsDeltas.filter((d) => !d.forwardedStable); + const heldUnstable = toolsDeltas.filter((d) => !d.heldStable); + process.stdout.write( + ` forwarded tools[] held stable across: ${toolsDeltas.length - leaked.length}/${toolsDeltas.length} (whole array)\n`, + ); + process.stdout.write( + ` shared-name subset held stable across: ${toolsDeltas.length - heldUnstable.length}/${toolsDeltas.length} (the guarantee actually made)\n`, + ); + for (const d of only.slice(0, 8)) { + process.stdout.write( + ` n=${d.prevN}->${d.n} ${d.kind} in=${d.count} out=${d.outCount} msgs=${d.msgKind} forwardedStable=${d.forwardedStable} heldStable=${d.heldStable}\n`, + ); + } + } + if (duplicateRequests) { + // BACKLOG "Duplicate-request probe -> census check (Q1)" — the + // CC#78420 falsifier (adjacent byte-identical bodies), re-answered + // per sweep instead of a throwaway scan. + process.stdout.write(`\nduplicate-request pairs (adjacent, byte-identical): ${duplicateRequests.length}\n`); + for (const d of duplicateRequests.slice(0, 8)) { + process.stdout.write(` n=${d.prevN}->${d.n} msgs=${d.msgs} ${d.ts}\n`); + } + } + } + + await rm(scratch, { recursive: true, force: true }); + // Exit non-zero on any violation so this is a gate, not just a report. + // Safety first in the message ordering because a corrupted conversation is + // a worse outcome than an expensive one: cache costs money, a mangled + // history costs correctness. + if (safety.length) { + process.stderr.write(`\nFAIL: ${safety.length} safety violation(s) — the pipeline altered the conversation\n`); + } + // Same rank as safety, and for the same reason: losing content CC sent is a + // corrupted conversation, not an expensive one. + if (conservation.length) { + process.stderr.write( + `\nFAIL: ${conservation.length} content-conservation violation(s) — bytes CC sent are neither on the wire nor accounted for\n`, + ); + } + // A replay-fidelity mismatch is not a further invariant — it is a statement + // that the five above were measured on a system that never ran. It fails the + // gate for that reason. "Nothing comparable" does NOT fail: it is an honest + // absence of evidence, reported as such rather than dressed up as a pass. + if ( + violations.length || + safety.length || + conservation.length || + sequence.length || + orderViolations.length || + fidelity.mismatches.length + ) { + process.exitCode = 1; + } +} + +// Run only when invoked as a script. The checkers above are exported and +// unit-tested (test/replay-gate-selfcheck.test.mjs); importing this module +// must not execute a replay. +if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) { + main().catch((err) => { + process.stderr.write(`replay failed: ${err?.stack ?? err}\n`); + process.exit(1); + }); +} diff --git a/tools/shape-verdicts.mjs b/tools/shape-verdicts.mjs new file mode 100644 index 00000000..599041f3 --- /dev/null +++ b/tools/shape-verdicts.mjs @@ -0,0 +1,414 @@ +#!/usr/bin/env node +// shape-verdicts — the fork's own judgment over its shape/baseline telemetry. +// +// Exists because this judgment briefly lived in the operator's dotfiles +// doctor, which meant the thresholds were declared in one repo and applied +// in another — "mirrored by convention", i.e. drift waiting to happen. The +// division of responsibility this restores: the FORK owns domain judgment +// (what a dormant-class reactivation or a baseline step means), the +// deployment repo owns aggregation (doctor invokes this CLI and books the +// verdicts, adding only "could not verify" when the CLI itself is absent). +// Single source: the growth thresholds are imported from harvest.mjs, the +// module that also applies them when freezing evidence. +// +// Baseline verdicts are computed at READ time, not harvest time, because the +// acknowledge-by-commit semantics demand it: a step warns exactly as long as +// the ledger change is uncommitted, and only the moment of asking knows that. +// +// Every verdict has THREE answers: ok / warn / could-not-verify (rendered as +// warn with the inability NAMED — absence must never read as green). +// +// CLI: node tools/shape-verdicts.mjs [--ledger FILE] → JSON array of +// { name, level: "ok"|"warn", message } on stdout, exit 0 (verdicts are the +// payload; a non-zero exit means the CLI itself failed). + +import { readFile, readdir, stat } from "node:fs/promises"; +import { readFileSync } from "node:fs"; +import { execFile } from "node:child_process"; +import { promisify } from "node:util"; +import { dirname, join, relative } from "node:path"; +import { fileURLToPath, pathToFileURL } from "node:url"; + +import { detectGrowthSteps, DEFAULT_LEDGER } from "./harvest.mjs"; +import { claudeHome } from "../proxy/claude-home.mjs"; + +const __dirname = dirname(fileURLToPath(import.meta.url)); +const REPO_ROOT = join(__dirname, ".."); +const pExecFile = promisify(execFile); + +// Minimum pair sample for a drop-RATE to be signal rather than noise +// (measured normal: 2 of ~1,900 pairs, context-pruning-shaped). +export const DROP_RATE_THRESHOLD = 0.05; +export const DROP_RATE_MIN_PAIRS = 50; +// The harvest timer fires twice daily; numbers older than this are frozen, +// and a verdict computed from frozen numbers must say so instead of +// printing "dormant" forever off a stalled timer. +export const HARVEST_MAX_AGE_H = 26; + +export function shapeWatchVerdict(ledger, nowMs = Date.now()) { + if (!ledger || typeof ledger !== "object" || typeof ledger.keys !== "object" || ledger.keys === null) { + return { + name: "shape-watch", + level: "warn", + message: "shape-watch: ledger missing or unreadable — class reactivation is NOT currently watched", + }; + } + const shapes = Object.entries(ledger.keys) + .filter(([, e]) => e && typeof e.shape === "object" && e.shape !== null) + .map(([k, e]) => [k, e.shape]); + if (!shapes.length) { + return { + name: "shape-watch", + level: "warn", + message: "shape-watch: ledger carries no shape fields yet — run harvest once", + }; + } + const newest = Object.values(ledger.keys) + .map((e) => Date.parse(e?.lastHarvest ?? "")) + .filter((t) => !Number.isNaN(t)) + .reduce((a, b) => Math.max(a, b), 0); + if (newest && nowMs - newest > HARVEST_MAX_AGE_H * 3600_000) { + const ageH = Math.round((nowMs - newest) / 3600_000); + return { + name: "shape-watch", + level: "warn", + message: + `shape-watch: newest harvest is ${ageH}h old (expected twice daily) — ` + + `numbers are frozen, the timer is not watching`, + }; + } + const fat = shapes + .map(([k, s]) => [k, s.thinkingTextCompleted ?? 0]) + .filter(([, n]) => n > 0); + if (fat.length) { + const [key, n] = fat.reduce((a, b) => (b[1] > a[1] ? b : a)); + return { + name: "shape-watch", + level: "warn", + message: + `shape-watch: completed-turn thinking text is BACK (${n} blocks, e.g. ${key.slice(0, 20)}) — ` + + `CC#69568 population active; re-evaluate v2StripSigned with fresh numbers`, + }; + } + const pairs = shapes.reduce((a, [, s]) => a + (s.pairs ?? 0), 0); + const drops = shapes.reduce((a, [, s]) => a + (s.thinkingDropPairs ?? 0), 0); + if (pairs >= DROP_RATE_MIN_PAIRS && drops / pairs > DROP_RATE_THRESHOLD) { + return { + name: "shape-watch", + level: "warn", + message: + `shape-watch: ${drops} of ${pairs} pairs lose thinking from shared history (>5%) — ` + + `CC#76253 class active; run a census`, + }; + } + return { + name: "shape-watch", + level: "ok", + message: `shape-watch: population 0, ${drops}/${pairs} drop pairs — both classes dormant`, + }; +} + +export function baselineStepVerdict(committed, current) { + if (!current || typeof current !== "object" || typeof current.keys !== "object" || current.keys === null) { + return { + name: "baseline", + level: "warn", + message: "baseline: working ledger missing or unreadable — growth is NOT currently watched", + }; + } + if (!committed || typeof committed !== "object" || typeof committed.keys !== "object" || committed.keys === null) { + // The first recording has nothing to compare against — named, not silent. + return { name: "baseline", level: "ok", message: "baseline: no committed comparison state yet" }; + } + const steps = []; + for (const [key, curE] of Object.entries(current.keys)) { + const curS = curE && typeof curE.shape === "object" ? curE.shape : null; + const oldE = committed.keys[key]; + const oldS = oldE && typeof oldE.shape === "object" ? oldE.shape : null; + if (!curS || !oldS) continue; + for (const step of detectGrowthSteps(oldS, curS)) { + steps.push( + `${key.slice(0, 20)} ${step.field} ${step.oldBytes}->${step.newBytes} ` + + `(+${Math.round((100 * (step.newBytes - step.oldBytes)) / step.oldBytes)}%)`, + ); + } + } + if (steps.length) { + return { + name: "baseline", + level: "warn", + message: + `baseline: prefix baseline grew — ${steps.slice(0, 3).join("; ")} — ` + + `intended? committing the ledger acknowledges`, + }; + } + return { name: "baseline", level: "ok", message: "baseline: no unreviewed step against HEAD" }; +} + +// Retention: a ledger key marked gone was DELETED by the capture cap before +// harvest finished with it — the designated cap-adequacy signal, which lived +// only on harvest's stdout until the closing-gate sweep flagged it as +// consumer-less. Acknowledge-by-commit, like baseline: a NEW gone entry +// warns until the ledger commit that any deliberate cap decision gets. +export function retentionVerdict(committed, current) { + if (!current || typeof current !== "object" || typeof current.keys !== "object" || current.keys === null) { + return { + name: "retention", + level: "warn", + message: "retention: working ledger missing or unreadable — expiry is NOT currently watched", + }; + } + const goneNow = Object.keys(current.keys).filter((k) => current.keys[k]?.gone); + const goneBefore = new Set( + committed && typeof committed.keys === "object" && committed.keys !== null + ? Object.keys(committed.keys).filter((k) => committed.keys[k]?.gone) + : [], + ); + const fresh = goneNow.filter((k) => !goneBefore.has(k)); + if (fresh.length) { + return { + name: "retention", + level: "warn", + message: + `retention: ${fresh.length} capture(s) expired before harvest finished ` + + `(${fresh.map((k) => k.slice(0, 16)).join(", ")}) — raise CACHE_FIX_CAPTURE_MAX_MB? ` + + `committing the ledger acknowledges`, + }; + } + return { name: "retention", level: "ok", message: "retention: no capture lost to the cap unacknowledged" }; +} + +// --- Telemetry-consumer table (Q4: alarm-without-reader gap) --- +// +// Every telemetry file a gated extension writes gets exactly one reader +// here, closing the gap the closing-gate sweep found: alarm files nothing +// reads (guard-events, upstream-changes) and log files nothing watches +// for silence (insertion/deferred event logs, session mirrors). +// Status-file fields and boot proxyTree are already the dotfiles doctor's +// own consumption and stay out of this table. +// +// "alarm" files exist to be noticed when non-empty — a recent entry IS +// the finding (output-guard restored a body, upstream shipped a +// structural change). "log" files are expected to accumulate under +// normal use; their only failure mode is silence while the writer's gate +// is on. Gate state: the env var each extension itself reads wins when +// SET — but shape-verdicts runs out-of-band (operator shell, doctor), +// where the serving gates are NOT in the env, so an unset var falls +// back to the last gate sweep's recorded serving set +// (cache-fix-gate-status.json `gates`, gateSource the proxy unit) — +// the same serving-truth source replay's --gates-from-capture trusts. +// No status file and no env -> off (absence of any gate evidence). +// "State unknowable" is reserved for the filesystem read itself +// failing for a reason other than absence (permissions, +// not-a-directory) — the one case gate state can't resolve. +// +// maxAgeH reuses HARVEST_MAX_AGE_H rather than inventing a second, +// evidence-free cadence per file — it is the one existing precedent in +// this module for "how long before telemetry is stale enough to say so". + +function snapshotsDir() { + return join(claudeHome(), "cache-fix-snapshots"); +} + +// Serving-gate fallback: the last sweep's recorded gate set. Cached per +// process (the CLI is one-shot); a missing/unreadable status file yields +// an empty map, so env-unset gates resolve off, never unknowable. +let _servingGates; +export function servingGate(name) { + if (_servingGates === undefined) { + _servingGates = {}; + try { + const status = JSON.parse( + readFileSync(join(claudeHome(), "cache-fix-gate-status.json"), "utf-8"), + ); + for (const g of status.gates ?? []) { + const eq = g.indexOf("="); + if (eq > 0) _servingGates[g.slice(0, eq)] = g.slice(eq + 1); + } + } catch { + /* no sweep recorded yet — env remains the only source */ + } + } + return _servingGates[name]; +} + +function gateResolves(name, onValue) { + const env = process.env[name]; + if (env !== undefined) return env === onValue; + return servingGate(name) === onValue; +} + +export const TELEMETRY_CONSUMERS = [ + { + name: "telemetry-guard-events", + kind: "alarm", + maxAgeH: HARVEST_MAX_AGE_H, + gate: () => gateResolves("CACHE_FIX_OUTPUT_GUARD", "1"), + dir: snapshotsDir, + suffix: "-guard-events.jsonl", + }, + { + name: "telemetry-upstream-changes", + kind: "alarm", + maxAgeH: HARVEST_MAX_AGE_H, + gate: () => gateResolves("CACHE_FIX_UPSTREAM_DETECTION", "1"), + file: () => join(process.env.CACHE_FIX_UPSTREAM_DIR || claudeHome(), "upstream-changes.jsonl"), + }, + { + name: "telemetry-insertion-events", + kind: "log", + maxAgeH: HARVEST_MAX_AGE_H, + gate: () => gateResolves("CACHE_FIX_INSERTION_NORMALIZE", "1"), + dir: snapshotsDir, + suffix: "-insertion-events.jsonl", + }, + { + name: "telemetry-deferred-tool-events", + kind: "log", + maxAgeH: HARVEST_MAX_AGE_H, + gate: () => gateResolves("CACHE_FIX_TOOL_REWRITE", "1"), + dir: snapshotsDir, + suffix: "-deferred-tool-events.jsonl", + }, + { + name: "telemetry-session-mirror", + kind: "log", + maxAgeH: HARVEST_MAX_AGE_H, + gate: () => gateResolves("CACHE_FIX_SESSION_MIRROR", "on"), + file: () => + process.env.CACHE_FIX_SESSION_MIRROR_EVENT_LOG || + join(claudeHome(), "session-mirrors", "session-mirror-events.jsonl"), + }, + { + // Born WITH its reader: this row landed before the gate's first flip + // (the CC#79989 first-hypothesis alarm), so the file never exists + // unread. Gate value is "on" — the extension checks !== "on", not "1". + name: "telemetry-upstream-errors", + kind: "alarm", + maxAgeH: HARVEST_MAX_AGE_H, + gate: () => gateResolves("CACHE_FIX_UPSTREAM_ERROR_LOG", "on"), + file: () => + process.env.CACHE_FIX_UPSTREAM_ERROR_LOG_PATH || + join(claudeHome(), "usage-log", "upstream-errors.jsonl"), + }, +]; + +// Resolve an entry to its newest matching file's mtime. `file` entries are +// a fixed path; `dir`+`suffix` entries glob one directory by suffix (the +// per-session `-` files output-guard, insertion-normalization, +// and deferred-tool-rewrite each write). ENOENT is a clean "nothing here +// yet"; any other fs error means the filesystem can't answer — unknowable. +async function newestMatch(entry) { + if (entry.file) { + try { + const st = await stat(entry.file()); + return { exists: true, mtimeMs: st.mtimeMs, unknowable: false }; + } catch (err) { + return { exists: false, mtimeMs: 0, unknowable: err?.code !== "ENOENT" }; + } + } + let names; + try { + names = await readdir(entry.dir()); + } catch (err) { + return { exists: false, mtimeMs: 0, unknowable: err?.code !== "ENOENT" }; + } + const matches = names.filter((n) => n.endsWith(entry.suffix)); + if (!matches.length) return { exists: false, mtimeMs: 0, unknowable: false }; + let newest = 0; + let unknowable = false; + for (const n of matches) { + try { + const st = await stat(join(entry.dir(), n)); + if (st.mtimeMs > newest) newest = st.mtimeMs; + } catch { + unknowable = true; + } + } + return { exists: true, mtimeMs: newest, unknowable }; +} + +export async function telemetryConsumerVerdict(entry, nowMs = Date.now()) { + const { name, kind, maxAgeH } = entry; + const { exists, mtimeMs, unknowable } = await newestMatch(entry); + + if (unknowable) { + return { name, level: "warn", message: `${name}: cannot read its telemetry path — state unknowable` }; + } + + const gateOn = entry.gate(); + + if (kind === "alarm") { + if (!exists) { + return gateOn + ? { name, level: "ok", message: `${name}: gate on, no alarm ever recorded` } + : { name, level: "warn", message: `${name}: no file yet and its gate is off — nothing to verify` }; + } + const ageH = (nowMs - mtimeMs) / 3600_000; + return ageH <= maxAgeH + ? { + name, + level: "warn", + message: `${name}: entry ${Math.round(ageH)}h ago (within ${maxAgeH}h) — needs a look`, + } + : { name, level: "ok", message: `${name}: no entry within ${maxAgeH}h` }; + } + + // kind === "log": staleness only means something while the gate is on. + if (!gateOn) { + return { name, level: "warn", message: `${name}: gate is off — staleness not assessed` }; + } + if (!exists) { + return { name, level: "warn", message: `${name}: gate on but the file has never been written` }; + } + const ageH = (nowMs - mtimeMs) / 3600_000; + return ageH > maxAgeH + ? { + name, + level: "warn", + message: `${name}: last write ${Math.round(ageH)}h ago (expected within ${maxAgeH}h while its gate is on)`, + } + : { name, level: "ok", message: `${name}: last write ${Math.round(ageH)}h ago` }; +} + +export async function computeTelemetryVerdicts(nowMs = Date.now()) { + return Promise.all(TELEMETRY_CONSUMERS.map((e) => telemetryConsumerVerdict(e, nowMs))); +} + +export async function computeVerdicts(ledgerPath = DEFAULT_LEDGER) { + let current = null; + try { + current = JSON.parse(await readFile(ledgerPath, "utf-8")); + } catch { + current = null; + } + let committed = null; + try { + const rel = relative(REPO_ROOT, ledgerPath).split("\\").join("/"); + const { stdout } = await pExecFile("git", ["-C", REPO_ROOT, "show", `HEAD:${rel}`], { + timeout: 10_000, + }); + committed = JSON.parse(stdout); + } catch { + committed = null; + } + return [ + shapeWatchVerdict(current), + baselineStepVerdict(committed, current), + retentionVerdict(committed, current), + ...(await computeTelemetryVerdicts()), + ]; +} + +if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) { + const args = process.argv.slice(2); + const li = args.indexOf("--ledger"); + const path = li >= 0 ? args[li + 1] : DEFAULT_LEDGER; + computeVerdicts(path).then( + (v) => process.stdout.write(JSON.stringify(v) + "\n"), + (err) => { + process.stderr.write(`shape-verdicts failed: ${err?.message ?? err}\n`); + process.exit(1); + }, + ); +} diff --git a/tools/verdict-ab.mjs b/tools/verdict-ab.mjs new file mode 100644 index 00000000..c5b3c70e --- /dev/null +++ b/tools/verdict-ab.mjs @@ -0,0 +1,256 @@ +#!/usr/bin/env node +// verdict-ab — per-request classification verdicts for TWO trees, diffed. +// +// Why a separate tool rather than a mode of replay.mjs (dev-loop: "extend an +// existing tool before writing a new one"): replay.mjs is single-tree by +// construction — it imports the extension it replays, and its whole gate +// vocabulary is about one pipeline against recorded traffic. The question here +// is different in kind: does CHANGING the code change any decision it takes on +// the committed corpus? That needs two extension modules resident at once, +// which is a harness concern, not a gate concern. +// +// It started as the throwaway A/B script of the unit-2b build (closing report +// 2026-07-30, "Corpus A/B — nothing else moved") and is committed here because +// it was needed a second time, by the reserved-entry-identity build — the +// dev-loop rule that a probe used twice graduates or dies. +// +// THREE ANSWERS, not two (dev-loop). The first version of the unit-2b probe +// printed "IDENTICAL" over two EMPTY dumps after crashing on both trees: an +// absence of evidence wearing a verdict's clothes. So an empty corpus, or a +// corpus in which no fixture yields a replayable request, exits 2 with +// COULD-NOT-VERIFY and never 0. +// +// node tools/verdict-ab.mjs [options] +// +// a git ref (checked out DETACHED into a scratch +// worktree, removed afterwards) or an existing directory +// holding a tree. Never the shared working tree. +// --seed-from-a feed tree B, at every request, the canonical tree A +// wrote for the preceding request. This is the +// OLD-CANON COMPATIBILITY probe: it asks whether the new +// code takes the same decision the old code did when it +// starts from state the old code produced — i.e. whether +// a restart is transparent for conversations already in +// flight. Without it, each tree runs its own chain, which +// asks the different (and also useful) question of +// whether steady-state behaviour moved. +// --fixtures fixture corpus directory +// (default: /test/fixtures/harvested) +// --scratch where scratch worktrees are created +// (default: $TMPDIR/verdict-ab-) +// --verbose print every verdict line, not only the differing ones +// +// exit 0 every verdict line identical +// exit 1 at least one differs (the diff is printed) +// exit 2 COULD NOT VERIFY — nothing replayable was found, or a tree failed +// to load. Never reported as a pass. + +import { execFileSync } from "node:child_process"; +import { existsSync, readdirSync, readFileSync, mkdirSync, rmSync } from "node:fs"; +import { dirname, join, resolve } from "node:path"; +import { fileURLToPath, pathToFileURL } from "node:url"; +import { tmpdir } from "node:os"; + +const REPO = resolve(dirname(fileURLToPath(import.meta.url)), ".."); +const EXT = "proxy/extensions/insertion-normalization.mjs"; + +function parseArgs(argv) { + const positional = []; + const opts = { seedFromA: false, verbose: false, fixtures: null, scratch: null }; + for (let i = 0; i < argv.length; i++) { + const a = argv[i]; + if (a === "--seed-from-a") opts.seedFromA = true; + else if (a === "--verbose") opts.verbose = true; + else if (a === "--fixtures") opts.fixtures = argv[++i]; + else if (a === "--scratch") opts.scratch = argv[++i]; + else if (a.startsWith("--")) fail(`unknown option ${a}`); + else positional.push(a); + } + if (positional.length !== 2) fail("need exactly two trees: "); + return { a: positional[0], b: positional[1], ...opts }; +} + +function fail(msg) { + console.error(`verdict-ab: ${msg}`); + process.exit(2); +} + +// A tree argument is either a directory that already holds the extension, or a +// git ref to check out detached. The shared working tree is never used as a +// scratch checkout: `git worktree add` refuses to reuse it, and a swap under a +// live working copy is the mistake the unit-2b report called out by name. +function resolveTree(spec, scratchRoot, created) { + const asDir = resolve(spec); + if (existsSync(join(asDir, EXT))) return { dir: asDir, label: spec }; + let sha; + try { + sha = execFileSync("git", ["-C", REPO, "rev-parse", "--verify", `${spec}^{commit}`], { + encoding: "utf-8", + }).trim(); + } catch { + fail(`"${spec}" is neither a directory holding ${EXT} nor a git ref in ${REPO}`); + } + const dir = join(scratchRoot, sha.slice(0, 12)); + if (!existsSync(dir)) { + execFileSync("git", ["-C", REPO, "worktree", "add", "--detach", dir, sha], { stdio: "pipe" }); + created.push(dir); + } + if (!existsSync(join(dir, EXT))) fail(`${spec} (${sha.slice(0, 12)}) has no ${EXT}`); + return { dir, label: `${spec} (${sha.slice(0, 8)})` }; +} + +// The committed corpus carries three shapes and all three are read, because a +// corpus silently narrowed to the shape the reader happens to parse is the +// blindness dev-loop names ("whatever a corpus is curated for, every other +// property is where it is blind") — and the first version of this reader saw +// 2 of the 6 message-array fixtures. +// +// { requests: [{ n, ts, messages }] } pre-grouped request-range fixtures +// (flap, reset-move) +// { header, records: [captureRecord] } pinned-range fixtures +// *.jsonl of captureRecords harvested pair fixtures +// +// A capture record is { ts, sid, key, headers, body:{ messages, system } }. +// A fixture that carries no message array at all (the growth snapshots, the +// oscillation fixture) yields nothing and is REPORTED as skipped — never +// silently counted as clean. +function requestsFromRecords(records) { + const out = []; + for (let i = 0; i < records.length; i++) { + const r = records[i]; + if (!Array.isArray(r?.body?.messages)) continue; + out.push({ n: i, messages: r.body.messages, headers: r.headers, system: r.body.system }); + } + return out; +} + +function loadCorpora(dir) { + if (!existsSync(dir)) fail(`fixture directory ${dir} does not exist`); + const corpora = []; + const skipped = []; + for (const name of readdirSync(dir).sort()) { + if (name.startsWith("LEDGER-")) continue; + const path = join(dir, name); + let requests = []; + try { + if (name.endsWith(".jsonl")) { + const records = readFileSync(path, "utf-8") + .split("\n") + .filter((l) => l.trim()) + .map((l) => JSON.parse(l)); + requests = requestsFromRecords(records); + } else if (name.endsWith(".json")) { + const doc = JSON.parse(readFileSync(path, "utf-8")); + requests = Array.isArray(doc?.requests) + ? doc.requests.filter((r) => Array.isArray(r?.messages)) + : requestsFromRecords(doc?.records ?? []); + } else { + continue; + } + } catch (e) { + skipped.push(`${name}: unreadable (${e.message})`); + continue; + } + if (requests.length === 0) { + skipped.push(`${name}: no request carries a messages array`); + continue; + } + corpora.push({ name: name.replace(/\.(json|jsonl)$/, ""), requests }); + } + return { corpora, skipped }; +} + +// The verdict line. Deliberately the same seven fields the unit-2b A/B used — +// action, reset reason, pinned, suppressed, moved, dropped, forwarded length — +// because they are what every downstream gate reads off `stats`, plus the +// forwarded length that says whether the wire changed shape. +const verdictLine = (corpus, n, res, rawLen) => + `${corpus} n=${n} action=${res.action}` + + ` reset=${res.resetReason ?? "-"}` + + ` pinned=${res.pinned ?? 0}` + + ` suppressed=${res.suppressed ?? 0}` + + ` moved=${res.moved ?? 0}` + + ` dropped=${res.dropped ?? 0}` + + ` out=${(res.messages ?? { length: rawLen }).length}`; + +async function main() { + const opts = parseArgs(process.argv.slice(2)); + const scratchRoot = resolve(opts.scratch ?? join(tmpdir(), `verdict-ab-${process.pid}`)); + mkdirSync(scratchRoot, { recursive: true }); + const created = []; + let exitCode = 0; + try { + const treeA = resolveTree(opts.a, scratchRoot, created); + const treeB = resolveTree(opts.b, scratchRoot, created); + let modA; + let modB; + try { + modA = await import(pathToFileURL(join(treeA.dir, EXT)).href); + modB = await import(pathToFileURL(join(treeB.dir, EXT)).href); + } catch (e) { + fail(`a tree failed to load: ${e.message}`); + } + if (typeof modA.classifyPinned !== "function" || typeof modB.classifyPinned !== "function") { + fail("classifyPinned is not exported by both trees"); + } + // Canonical state is PER CONVERSATION, and one capture key carries the main + // thread, every subagent and CC's own sidecar calls. Chaining one canonical + // across all of them would make tenant switches look like churn and every + // verdict line downstream of the first switch meaningless. The grouping + // identity is the extension's OWN — imported, never re-derived (dev-loop, + // "never hand-roll identity in a probe"). + const groupOf = (r) => modA.resolveInsertionSessionKey(r.headers, r.messages, r.system); + + const { corpora, skipped } = loadCorpora(resolve(opts.fixtures ?? join(REPO, "test/fixtures/harvested"))); + console.log(`A: ${treeA.label} ${treeA.dir}`); + console.log(`B: ${treeB.label} ${treeB.dir}`); + console.log(`mode: ${opts.seedFromA ? "seed-from-A (old-canon compatibility)" : "independent chains"}`); + for (const s of skipped) console.log(` skipped ${s}`); + + const diffs = []; + let lines = 0; + for (const { name, requests } of corpora) { + const canonA = new Map(); + const canonB = new Map(); + const groups = new Set(); + for (const r of requests) { + const g = groupOf(r); + groups.add(g); + const priorA = canonA.get(g) ?? null; + const resA = modA.classifyPinned(r.messages, priorA); + const resB = modB.classifyPinned(r.messages, opts.seedFromA ? priorA : (canonB.get(g) ?? null)); + const lineA = verdictLine(name, r.n, resA, r.messages.length); + const lineB = verdictLine(name, r.n, resB, r.messages.length); + lines++; + if (opts.verbose) console.log(` A ${lineA}\n B ${lineB}`); + if (lineA !== lineB) diffs.push({ a: lineA, b: lineB }); + canonA.set(g, resA.canonicalEntries); + canonB.set(g, resB.canonicalEntries); + } + console.log(` ${name}: ${requests.length} request(s), ${groups.size} conversation(s)`); + } + + // The third answer. Zero lines is not "identical" — it is nothing checked. + if (lines === 0) { + console.log("COULD NOT VERIFY — no fixture yielded a replayable request"); + exitCode = 2; + } else if (diffs.length === 0) { + console.log(`IDENTICAL across ${lines} verdict lines, ${corpora.length} corpora`); + } else { + console.log(`DIFFERS on ${diffs.length} of ${lines} verdict lines:`); + for (const d of diffs) console.log(` - A ${d.a}\n + B ${d.b}`); + exitCode = 1; + } + } finally { + for (const dir of created) { + try { + execFileSync("git", ["-C", REPO, "worktree", "remove", "--force", dir], { stdio: "pipe" }); + } catch { + rmSync(dir, { recursive: true, force: true }); + } + } + } + process.exit(exitCode); +} + +await main();