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docs: add cross-repo protocol linking stress test report
18-repo stress test validating cross-service protocol linking: - 64K nodes, 129K edges, 3361 endpoints, 1433 cross-project links - GraphQL + Pub/Sub linking across 21 repo pairs, 147 unique identifiers - 100% spot-check accuracy, no regressions Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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‎docs/STRESS-TEST-CROSS-REPO.md‎

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# CBM Cross-Repo Stress Test Report — 2026-04-08
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## Summary
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Full stress test of codebase-memory-mcp with cross-service protocol linking across 18 real-world microservice repos. Clean-slate re-index, endpoint validation, cross-project link verification, and regression checks.
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**Result: PASS** — all repos index cleanly, 1,433 cross-links are accurate, no regressions, no bugs.
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## Build & Tests
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- **Tests**: 2914/2914 passed, 0 failures, 0 sanitizer errors
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- **Binary**: built from source with `make -f Makefile.cbm cbm`
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## Per-Repo Index Results
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| Repo | Nodes | Edges | Endpoints | Index Time |
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|------|------:|------:|----------:|-----------:|
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| mobile-app | 25,026 | 43,842 | 874 | 6,844ms |
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| main-api | 12,632 | 32,216 | 1,543 | 10,680ms |
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| ml-service | 7,935 | 21,028 | 0 | 5,559ms |
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| deposits-service | 5,008 | 6,869 | 33 | 1,954ms |
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| integration-service | 4,280 | 8,402 | 137 | 3,274ms |
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| monitoring-service | 2,185 | 3,736 | 55 | 1,014ms |
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| banking-service | 2,017 | 4,423 | 49 | 2,051ms |
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| savings-service | 1,593 | 3,065 | 84 | 1,663ms |
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| event-subscriptions | 841 | 1,296 | 488 | 447ms |
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| app-service | 660 | 1,027 | 42 | 502ms |
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| tools-mcp | 636 | 1,201 | 1 | 543ms |
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| compliance-service | 416 | 666 | 50 | 318ms |
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| ci-actions | 397 | 393 | 0 | 97ms |
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| tools-mcp-2 | 281 | 494 | 0 | 302ms |
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| chat-bot | 103 | 138 | 0 | 162ms |
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| graph-mcp | 94 | 154 | 5 | 192ms |
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| acl | 73 | 97 | 0 | 130ms |
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| acl-v2 | 73 | 97 | 0 | 110ms |
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| **Total** | **64,250** | **129,144** | **3,361** | **~35.8s** |
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### Endpoint Discovery Details
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| Repo | GraphQL Producers | GraphQL Consumers | Pub/Sub Producers | Pub/Sub Consumers | Other |
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|------|------------------:|------------------:|------------------:|------------------:|-------|
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| main-api | 1,423 | 56 | 56 | 0 | — |
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| mobile-app | — | — | — | — | 874 (GraphQL consumers from gql tags) |
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| event-subscriptions | — | — | 186 | 294 | — |
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| integration-service | 69 | 38 | 20 | 0 | — |
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| savings-service | 48 | 14 | 16 | 0 | — |
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| monitoring-service | — | — | 3 | 5 | MQTT 3, NATS 12, Redis 12 |
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| compliance-service | 26 | 8 | 6 | 0 | — |
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| banking-service | 15 | 20 | 12 | 0 | — |
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| app-service | 24 | 8 | 4 | 0 | — |
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| deposits-service | 19 | 0 | 8 | 0 | — |
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| graph-mcp | — | — | 2 | 1 | — |
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| tools-mcp | — | — | — | — | SSE 1 |
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## Cross-Project Links
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### Totals
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| Protocol | Links | Unique Identifiers |
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|----------|------:|-------------------:|
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| GraphQL | 1,117 | 109 |
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| Pub/Sub | 316 | 38 |
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| **Total** | **1,433** | **147** |
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### Link Growth During Indexing
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The crosslink count grew incrementally as each repo was indexed (rebuild runs after every index):
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| After Indexing | Cross-Links | Notes |
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|----------------|------------:|-------|
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| event-subscriptions (5th) | 148 | First pubsub links: main-api <-> event-subscriptions |
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| app-service (6th) | 172 | +24: app-service graphql/pubsub links |
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| integration-service (10th) | 261 | +89: integration-service graphql + pubsub |
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| deposits-service (11th) | 281 | +20: deposits pubsub |
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| compliance-service (12th) | 303 | +22: compliance pubsub |
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| mobile-app (14th) | 1,160 | +857: massive graphql consumer addition |
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| banking-service (15th) | 1,351 | +191: banking graphql + pubsub |
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| savings-service (16th) | 1,533 | +182: savings graphql + pubsub |
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| Final (all 18) | 1,533 | No additional from remaining repos |
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Note: DB-level count (1,533) includes directional pairs; the MCP tool deduplicates to unique entries.
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### Top Repo Pairs
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**GraphQL (14 repo pairs):**
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| Producer | Consumer | Links |
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|----------|----------|------:|
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| main-api | mobile-app | 501 |
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| banking-service | mobile-app | 131 |
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| app-service | mobile-app | 127 |
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| compliance-service | mobile-app | 119 |
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| savings-service | mobile-app | 117 |
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| main-api | integration-service | 32 |
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| main-api | savings-service | 25 |
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| integration-service | mobile-app | 24 |
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| integration-service | main-api | 13 |
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| main-api | banking-service | 10 |
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| main-api | app-service | 6 |
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| main-api | compliance-service | 6 |
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| app-service | main-api | 4 |
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| banking-service | integration-service | 2 |
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**Pub/Sub (7 repo pairs):**
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| Producer | Consumer | Links |
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|----------|----------|------:|
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| main-api | event-subscriptions | 148 |
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| integration-service | event-subscriptions | 44 |
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| savings-service | event-subscriptions | 40 |
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| banking-service | event-subscriptions | 36 |
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| deposits-service | event-subscriptions | 20 |
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| compliance-service | event-subscriptions | 16 |
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| app-service | event-subscriptions | 12 |
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## Link Quality Spot-Check
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8 links manually verified (5 GraphQL, 3 Pub/Sub) — all correct.
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### GraphQL (5/5 verified)
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| Identifier | Producer | Consumer | Confidence | Verdict |
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|------------|----------|----------|:----------:|:-------:|
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| acceptTerms | main-api (GraphQL schema) | mobile-app (React component) | 0.95 | OK |
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| adminById | main-api (GraphQL schema) | integration-service (resolver) | 0.95 | OK |
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| cancelLogin | main-api (GraphQL schema) | mobile-app (screen) | 0.95 | OK |
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| cancelSession | integration-service (GraphQL schema) | mobile-app (component) | 0.85 | OK |
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| appVersions | main-api (resolver) | mobile-app (service) | 0.95 | OK |
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### Pub/Sub (3/3 verified)
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| Identifier | Producer | Consumer | Confidence | Verdict |
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|------------|----------|----------|:----------:|:-------:|
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| customer.deletion-requested | main-api (event class) | event-subscriptions (Terraform config) | 0.85 | OK |
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| cap-interest.created | main-api (event class) | event-subscriptions (Terraform config) | 0.85 | OK |
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| session.updated | integration-service (event class) | event-subscriptions (Terraform config) | 0.85 | OK |
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All pubsub links use normalized matching (0.85) because the identifier format differs (dot-separated topic names vs. hyphenated Terraform file/resource names). This is correct behavior.
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## Regression Check
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| Check | Result |
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|-------|--------|
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| Intra-repo GRAPHQL_CALLS edges | Present and correct — OK |
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| Intra-repo PUBSUB_CALLS edges | Present and correct — OK |
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| get_architecture tool | Returns correct node/edge totals — OK |
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| list_projects tool | All 18 projects listed with correct stats — OK |
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| query_graph tool | Responds correctly to MATCH queries — OK |
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## Bug Note
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During the initial stress test, unfiltered `cross_project_links` appeared to truncate after the graphql section (reporting 163 instead of 1,433 links). Investigation revealed this was caused by a **stale binary** — the source code at commit `8e82f2c` already replaced the fixed 58KB buffer with a growable `realloc` pattern (`src/mcp/mcp.c:3460-3466`). After rebuilding from the latest source:
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- Unfiltered query now returns **1,433 total links** (vs 163 with stale binary)
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- All protocols included in a single response
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- No truncation
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**Lesson:** Always rebuild from source before stress testing.
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## Repos With No Endpoints (Expected)
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These repos have no protocol patterns — purely config/infra/tooling:
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- acl, acl-v2 (ACL library — no service calls)
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- ml-service (Python ML models — no GraphQL/Pub/Sub)
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- tools-mcp-2 (MCP tool config — no protocol patterns)
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- ci-actions (CI/CD workflows)
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- chat-bot (internal bot)
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## Conclusion
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The cross-repo protocol linking feature is working correctly across 18 real-world repos:
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- **3,361 protocol endpoints** discovered across 12 repos
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- **1,433 cross-project links** (1,117 GraphQL + 316 Pub/Sub) connecting 14 GraphQL + 7 Pub/Sub repo pairs
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- **147 unique identifiers** linked across projects
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- **100% spot-check accuracy** on sampled links
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- **No regressions** in existing MCP tools
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- **No bugs** (initial truncation issue was a stale binary — source already had the fix)
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- **Total index time**: ~36 seconds for all 18 repos (64K nodes, 129K edges)

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