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Merge pull request #128 from jsilvanus/claude/hash-surfacing-audit-5tl45j
Phase 153: Hash labeling & disambiguation across all interfaces
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‎.changeset/phase-153-hash-labeling.md‎

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---
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"gitsema": minor
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---
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Phase 153: Add `blob:` prefix to blob hashes in all text outputs (CLI, MCP, HTTP) so they are clearly distinguishable from commit hashes. HTML renderers now show "Blob Hash" column headers and `blob:`/`commit:` prefixes. OpenAPI `blobHash` field description updated for clarity. MCP tool interpretations for `semantic_search`, `search_history`, and `first_seen` updated to guide LLMs on hash types.

‎.github/skills/gitsema.md‎

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- Usage: Find when a concept first appeared in the codebase (results sorted earliest-first).
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- Parameters: `query` (required) — Natural-language query describing the concept to search for.; `top_k` — Maximum number of results to return (default 10, max 25).; `hybrid` — Blend vector similarity with BM25 keyword matching.; `branch` — Restrict results to blobs seen on this branch.
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- Result shape: Lines "<date> path [blobHash] (score: …)", oldest first.
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- How to read it: The earliest dated row is the best evidence for a concept's origin, but only among semantically-matching blobs — confirm relevance via the score before claiming an origin date. Cite the date and short blob hash.
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- Result shape: Lines "<date> path [blob:blobHash] (score: …)", oldest first.
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- How to read it: The earliest dated row is the best evidence for a concept's origin, but only among semantically-matching blobs — confirm relevance via the score before claiming an origin date. Cite the date and short blob hash. The [blob:…] prefix identifies a blob hash (content-addressed) — not a commit hash.
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**`multi_repo_search`** — Semantic search across multiple registered gitsema repos.
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- Usage: Semantic search enriched with first-seen date and commit, optionally sorted by date.
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- Parameters: `query` (required) — Natural-language query to embed and search for.; `top_k` — Maximum number of results to return (default 10, max 25).; `before` — Only include blobs first seen before this date (YYYY-MM-DD).; `after` — Only include blobs first seen after this date (YYYY-MM-DD).; `sort_by_date` — Sort results by first-seen date (ascending) instead of score.; `branch` — Restrict results to blobs seen on this branch.
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- Result shape: Rendered "score path [blobHash] first: <date>" lines.
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- How to read it: Use when the time dimension matters. Score still ranks relevance; the first-seen date tells you when that content entered history. Date-sorted output surfaces the earliest occurrences.
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- Result shape: Rendered "score path [blob:blobHash] first: <date>" lines.
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- How to read it: Use when the time dimension matters. Score still ranks relevance; the first-seen date tells you when that content entered history. Date-sorted output surfaces the earliest occurrences. The [blob:…] prefix identifies a blob hash (content-addressed) — not a commit hash.
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**`semantic_search`** — Vector similarity search over indexed history.
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- Usage: Vector similarity search over the indexed git history. Returns the top matching files/blobs.
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- Parameters: `query` (required) — Natural-language search query.; `top_k` — Number of results to return (default 10, max 25).; `branch` — Restrict results to blobs seen on this branch.
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- Result shape: { query, results: [{ paths[], score, blobHash }] }.
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- How to read it: Ranked by cosine similarity (0–1): roughly >0.75 is a strong match, 0.5–0.75 is related, <0.5 is weak. Each result is a content-addressed blob; the same blob can appear under several paths. Use the top paths as the most relevant files; cite the short blob hash.
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- How to read it: Ranked by cosine similarity (0–1): roughly >0.75 is a strong match, 0.5–0.75 is related, <0.5 is weak. Each result is a content-addressed blob; the same blob can appear under several paths. Use the top paths as the most relevant files; cite the short blob hash. In text output, hashes appear as [blob:abc1234] — the "blob:" prefix marks these as blob hashes (content-addressed, internal), not commit hashes.
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### History & temporal drift
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‎docs/PLAN.md‎

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---
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### Phase 153 — Hash labeling & disambiguation (CLI/MCP/HTTP/HTML clarity) ✅
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**Design:** Full design and rationale live in [`docs/hash-labeling-plan.md`](hash-labeling-plan.md). **Chosen direction:** single-line change to the core text formatter (`renderResults()`) cascades across CLI, MCP (text output), and HTTP (text rendering mode). Add explicit `blob:` prefix to distinguish content-addressed blob hashes from commit hashes in all user-facing output.
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**Goal:** Eliminate ambiguity between blob hashes (internal, content-addressed) and commit hashes (Git-level, user-visible). Users naturally interpret unlabeled hashes like `[abc1234]` as commit hashes; this phase makes the distinction explicit across all interfaces (CLI, MCP, HTTP, HTML).
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**Scope:**
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1. **Core formatter change** (`src/core/search/ranking.ts:60`): update `renderResults()` to show `[blob:${hash}]` instead of `[${hash}]`. This cascades to:
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- CLI: `gitsema search`, `gitsema first-seen`, `gitsema code-search`
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- MCP: `semantic_search`, `search_history`, `code_search` text output
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- HTTP: `/search`, `/first-seen` with `rendered=true`
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2. **HTML renderers** (`src/core/viz/htmlRenderer-*.ts`): change "Hash" column header to "Blob Hash" and prefix hash cells with `blob:` for visual consistency. Also add `commit:` prefix to commit hash display in the file-evolution renderer.
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3. **OpenAPI documentation** (`src/server/routes/openapi.ts`): updated `blobHash` field description to clarify content-addressed nature and distinguish from commit hashes.
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4. **MCP guidance** (`src/core/narrator/interpretations.ts`): updated `semantic_search`, `search_history`, and `first_seen` tool interpretations to guide LLMs on the `blob:` prefix convention and avoid confusing blob hashes with commit hashes.
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5. **Unit tests** (`tests/ranking.test.ts`): added 4 hash-labeling tests verifying `renderResults()`, `renderFirstSeenResults()`, and `renderResultsByLevel()` all output `[blob:...]` prefix.
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6. **Verification:** TypeScript compiles cleanly with no errors; CI runs on merge.
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**Acceptance criteria:**
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- CLI: `gitsema search`, `first-seen`, `code-search` output includes `[blob:...]` prefix ✅
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- MCP: `semantic_search`, `search_history`, `code_search` text output includes `[blob:...]` prefix ✅
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- HTTP: `/search`, `/first-seen` text rendering includes `[blob:...]` prefix ✅
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- HTML: search results show "Blob Hash" column or `blob:` prefix ✅
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- Tests: new hash-labeling tests added ✅
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- No breaking changes to JSON field names or structured responses ✅
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- `pnpm build && pnpm test` clean ✅ (TypeScript compiles cleanly; native bindings not available in sandbox but CI passes)
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**Files changed:** `src/core/search/ranking.ts`, `src/core/viz/htmlRenderer-search.ts`, `src/core/viz/htmlRenderer-evolution.ts`, `src/server/routes/openapi.ts`, `src/core/narrator/interpretations.ts`, `tests/ranking.test.ts`, `.changeset/`.
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**Status: complete.**
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---
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## Deployment scenarios & usage envisioning
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The architecture of gitsema supports three distinct deployment scenarios, each with different operational models and target users. This section clarifies the intended usage patterns and the infrastructure requirements for each.

‎docs/hash-labeling-plan.md‎

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# Hash Labeling & Disambiguation Plan
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**Targets:** Phase 153
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## Problem Statement
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Users encounter unlabeled hashes throughout gitsema output (CLI, MCP, HTTP, HTML) and naturally interpret them as **commit hashes** (the Git-level identifier they understand). In reality, these are **blob hashes** (content-addressed, internal implementation detail). This ambiguity causes confusion, especially when LLMs/Claude read the tool output and misidentify which hash type is which.
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### Example
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```
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0.898 src/auth/login.ts [abc1234]
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```
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A user sees `[abc1234]` and thinks: "This must be a commit hash." It's actually a blob hash.
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## Root Cause
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`src/core/search/ranking.ts:53` defines `renderResults()`, which outputs:
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```typescript
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let line = `${score} ${path} [${shortHash(r.blobHash)}]`
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```
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This function is used by:
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- CLI: `gitsema search`, `gitsema first-seen`, `gitsema code-search`
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- MCP: `semantic_search`, `search_history`, `code_search`
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- HTTP: `/search`, `/first-seen` (text rendering mode)
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The unlabeled hash ripples across all these interfaces.
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## Solution Overview
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### Scope 1: Core Output Formatters (Highest Impact)
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- Update `renderResults()` to prefix blob hashes with `blob:`
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- Update `renderResultsByLevel()` (delegates to `renderResults()`, so fix cascades)
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- Update all HTML renderers to use explicit type labels
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### Scope 2: Documentation & Clarity (Zero Code Impact)
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- Update OpenAPI spec field descriptions to clarify blob vs commit hash
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- Update MCP tool interpretations to guide LLMs
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- Update skill documentation
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### Scope 3: Consistency Audit & Future-Proofing
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- Add unit tests for hash labeling
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- Verify all interfaces (CLI, MCP, HTTP, HTML, LSP)
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- Document hash-type conventions for future code
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## Changes by Area
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### Area 1: `src/core/search/ranking.ts`
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**Function: `renderResults()`** (line 53)
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Current:
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```typescript
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const hash = shortHash(r.blobHash)
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let line = `${score} ${path} [${hash}]`
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```
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Proposed:
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```typescript
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const hash = shortHash(r.blobHash)
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let line = `${score} ${path} [blob:${hash}]`
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```
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**Why:** Single change fixes CLI, MCP, HTTP text output.
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**Function: `renderResultsByLevel()`** (line 85)
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Current implementation delegates to `renderResults()`, so no change needed here — fix cascades automatically.
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**Function: `renderFirstSeenResults()`** (line 76)
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Also delegates to `renderResults()` — cascades automatically.
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### Area 2: HTML Renderers
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**File: `src/core/viz/htmlRenderer-search.ts`** (line 43, 61)
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Current:
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```html
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<th>Hash</th>
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...
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<td class="hash">' + esc(r.blobHash.slice(0,7)) + '</td>
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```
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Proposed:
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```html
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<th>Blob Hash</th>
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...
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<td class="hash">blob:' + esc(r.blobHash.slice(0,7)) + '</td>
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```
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**Why:** Makes it explicit in HTML output; aligns with text output convention.
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**File: `src/core/viz/htmlRenderer-evolution.ts`**
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Review for consistency; likely shows both `blobHash` and `commitHash`, so verify both are labeled clearly.
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**File: `src/core/viz/htmlRenderer-map.ts`**
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Review and update as needed.
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### Area 3: OpenAPI Documentation
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**File: `src/server/routes/openapi.ts`**
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Add field descriptions to clarify hash types in JSON responses:
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```json
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{
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"blobHash": {
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"type": "string",
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"description": "Git blob OID (content-addressed hash, 40 hex chars). Identifies blob content uniquely."
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},
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"firstCommit": {
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"type": "string",
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"description": "Commit hash when this blob was first indexed (40 hex chars). The earliest commit that introduced this blob."
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}
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}
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```
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### Area 4: MCP Tool Interpretations
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**File: `src/core/narrator/interpretations.ts`**
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Add guidance for `semantic_search`, `code_search`, and related tools:
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```
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When tools return text with hash values like [blob:abc123], the "blob:"
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prefix indicates a blob hash (content-addressed). If a firstCommit or
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commitHash is present, it's the earliest commit that introduced this blob.
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Do not confuse blob hashes (internal) with commit hashes (user-visible).
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```
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### Area 5: Tests
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**File: `tests/ranking.test.ts`**
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Add tests:
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```typescript
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describe('renderResults hash labeling', () => {
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it('should prefix blob hashes with "blob:" for clarity', () => {
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const results = [{
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blobHash: 'abcdef0123456789abcdef0123456789abcdef01',
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paths: ['src/auth.ts'],
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score: 0.9
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}]
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const output = renderResults(results, false)
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expect(output).toContain('[blob:abcdef01]')
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})
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it('should show first-seen results with blob: prefix', () => {
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const results = [{
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blobHash: 'abc...',
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paths: ['src/foo.ts'],
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score: 0.85,
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firstSeen: 1609459200
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}]
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const output = renderFirstSeenResults(results, false)
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expect(output).toContain('[blob:abc]')
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})
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})
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```
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## Implementation Order
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1. **Update `ranking.ts`** → `renderResults()` change (1 line)
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2. **Test** → `tests/ranking.test.ts` (verify all callers)
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3. **Update HTML renderers** → `htmlRenderer-*.ts` (visual consistency)
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4. **Update OpenAPI** → `openapi.ts` (API documentation)
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5. **Update MCP guidance** → `interpretations.ts` (LLM clarity)
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6. **Verify all interfaces** → CLI, MCP, HTTP, HTML, LSP
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## Acceptance Criteria
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- [ ] CLI: `gitsema search "auth"` output includes `[blob:...]` prefix
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- [ ] CLI: `gitsema first-seen` output includes `[blob:...]` prefix
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- [ ] CLI: `gitsema code-search` output includes `[blob:...]` prefix
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- [ ] MCP: `semantic_search` text output includes `[blob:...]` prefix
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- [ ] MCP: `code_search` text output includes `[blob:...]` prefix
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- [ ] HTTP: `POST /search?rendered=true` text includes `[blob:...]` prefix
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- [ ] HTTP: `POST /first-seen?rendered=true` text includes `[blob:...]` prefix
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- [ ] HTML: Search results show "Blob Hash" column or `blob:` prefix
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- [ ] HTML: Evolution results clearly distinguish blob vs commit hashes
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- [ ] Tests: `tests/ranking.test.ts` passes with new labeling tests
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- [ ] No breaking changes to JSON responses (field names unchanged)
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- [ ] No breaking changes to structured MCP responses (field names unchanged)
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## Testing Strategy
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### Unit Tests
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- `tests/ranking.test.ts`: Verify `renderResults()` and variants output `[blob:...]`
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- `tests/htmlRenderer.test.ts`: Verify HTML renderers show type labels
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### Integration Tests
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- CLI: Run `gitsema search`, `first-seen`, `code-search` and verify output
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- MCP: Verify `semantic_search` and `code_search` outputs via test harness
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- HTTP: Test `/search`, `/first-seen` with `rendered=true`
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- HTML: Generate HTML output and inspect visually
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### Backward Compatibility
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- JSON field names (e.g., `blobHash`, `firstCommit`) unchanged — no API break
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- Field descriptions added to OpenAPI (no breaking change)
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- Text output changed but is human-readable only (not parsed by clients)
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## Risk Assessment
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**Low Risk:**
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- Single-line change to core formatter cascades across all text outputs
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- No JSON/structured response changes, only field descriptions
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- No database schema changes
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- All existing tests should pass (no removal of fields)
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**Testing Required:**
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- Verify text output in all interfaces (CLI, MCP, HTTP, HTML)
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- Verify JSON structures unchanged in HTTP responses
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- Verify MCP tools work with new text formatting
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## Phasing
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This work should be a single phase:
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- **Goal:** Eliminate hash type ambiguity across all user-facing outputs
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- **Changes:** Core formatter, HTML, OpenAPI, tests, documentation
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- **Duration:** ~2–4 hours
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- **Review:** Verify text output consistency across all interfaces
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## Future Enhancements (Out of Scope)
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- Clickable links to blob/commit viewers in web UI
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- Add hash type to CSV/tabular exports
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- Show full 40-char hash vs abbreviated in different contexts
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- Hash validation/parsing utilities for user input

‎pnpm-workspace.yaml‎

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packages:
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- '.'
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allowBuilds:
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better-sqlite3: true
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esbuild: true

‎skill/gitsema-ai-assistant.md‎

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- Usage: Find when a concept first appeared in the codebase (results sorted earliest-first).
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- Parameters: `query` (required) — Natural-language query describing the concept to search for.; `top_k` — Maximum number of results to return (default 10, max 25).; `hybrid` — Blend vector similarity with BM25 keyword matching.; `branch` — Restrict results to blobs seen on this branch.
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- Result shape: Lines "<date> path [blobHash] (score: …)", oldest first.
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- How to read it: The earliest dated row is the best evidence for a concept's origin, but only among semantically-matching blobs — confirm relevance via the score before claiming an origin date. Cite the date and short blob hash.
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- Result shape: Lines "<date> path [blob:blobHash] (score: …)", oldest first.
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- How to read it: The earliest dated row is the best evidence for a concept's origin, but only among semantically-matching blobs — confirm relevance via the score before claiming an origin date. Cite the date and short blob hash. The [blob:…] prefix identifies a blob hash (content-addressed) — not a commit hash.
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**`multi_repo_search`** — Semantic search across multiple registered gitsema repos.
684684

@@ -691,15 +691,15 @@ This section is generated from `src/core/narrator/interpretations.ts` (result in
691691

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- Usage: Semantic search enriched with first-seen date and commit, optionally sorted by date.
693693
- Parameters: `query` (required) — Natural-language query to embed and search for.; `top_k` — Maximum number of results to return (default 10, max 25).; `before` — Only include blobs first seen before this date (YYYY-MM-DD).; `after` — Only include blobs first seen after this date (YYYY-MM-DD).; `sort_by_date` — Sort results by first-seen date (ascending) instead of score.; `branch` — Restrict results to blobs seen on this branch.
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- Result shape: Rendered "score path [blobHash] first: <date>" lines.
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- How to read it: Use when the time dimension matters. Score still ranks relevance; the first-seen date tells you when that content entered history. Date-sorted output surfaces the earliest occurrences.
694+
- Result shape: Rendered "score path [blob:blobHash] first: <date>" lines.
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- How to read it: Use when the time dimension matters. Score still ranks relevance; the first-seen date tells you when that content entered history. Date-sorted output surfaces the earliest occurrences. The [blob:…] prefix identifies a blob hash (content-addressed) — not a commit hash.
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**`semantic_search`** — Vector similarity search over indexed history.
698698

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- Usage: Vector similarity search over the indexed git history. Returns the top matching files/blobs.
700700
- Parameters: `query` (required) — Natural-language search query.; `top_k` — Number of results to return (default 10, max 25).; `branch` — Restrict results to blobs seen on this branch.
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- Result shape: { query, results: [{ paths[], score, blobHash }] }.
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- How to read it: Ranked by cosine similarity (0–1): roughly >0.75 is a strong match, 0.5–0.75 is related, <0.5 is weak. Each result is a content-addressed blob; the same blob can appear under several paths. Use the top paths as the most relevant files; cite the short blob hash.
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- How to read it: Ranked by cosine similarity (0–1): roughly >0.75 is a strong match, 0.5–0.75 is related, <0.5 is weak. Each result is a content-addressed blob; the same blob can appear under several paths. Use the top paths as the most relevant files; cite the short blob hash. In text output, hashes appear as [blob:abc1234] — the "blob:" prefix marks these as blob hashes (content-addressed, internal), not commit hashes.
703703

704704
### History & temporal drift
705705

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