P0.2.4 α Health Check Tool — Verification

Task: P0.2.4 — server_health MCP tool Branch: feature/p0-2-4-health Base: origin/main at 6c26bb58 (post P0.7.1) Chain head commit: pending (verify step)

Commands executed

cd E:/AMS/.worktrees/claude/p0-2-4-health
npm ci
npm test           # full suite
npm run lint
npm run build

Results

Full test suite

Test Suites: 10 passed, 10 total
Tests:       538 passed, 538 total
Time:        ~24 s

All pre-existing suites pass unchanged. 30 new tests added for server_health:

server_health registration + handler (under describe: server_health tool)
Phase 2 DB plumbing (ctx.db + ctx.phase set after Phase 2 runs)
Phase 1 fallback (db_tables: 0, phase: "phase1" when DB handle not yet present)
Mode reflection (FULL, READONLY, TEST, MINIMAL)
Response time < 100ms SLA
Stage-3/5 audit emission
Schema validation rejection at stage 2

Coverage (new files — `src/tools/health.ts`)

File      | % Stmts | % Branch | % Funcs | % Lines
health.ts |   100   |   100    |   100   |   100

Repo-level coverage post-P0.2.4:

src/server.ts: 97.39% stmt / 92.59% branch (up-trim from ctx extensions; uncovered: 566, 580-581 — the IIFE script-invocation guard covered by subprocess test)
src/startup.ts: 100% stmt / 92.59% branch (uncovered: 176, 326, 391-392 — sink-error logging branches)
src/db/index.ts: 100% stmt / 95% branch

Lint

npm run lint  # eslint src → no output → clean

Build

npm run build  # tsc → no errors

Acceptance criteria check

Criterion	Status
Tool name `server_health` (snake_case, per TOOL_NAME_RE)	✅
Returns `{ status, version, uptime_ms, db_tables, phase, mode }`	✅
`db_tables` = count of non-sqlite_% SQLite tables	✅
`phase` ∈ `"phase1"` \| `"phase2"`	✅
`mode` = current `RuntimeMode` string	✅
Response < 100ms	✅ asserted in test
100% branch coverage on new file	✅ 100/100
Full suite passes	✅ 538/538
Lint passes	✅
Build passes	✅

Deviations from packet

ColibriServerContext gained two mutable fields (db?, phase?) — packet called them out as optional interface extensions; implementation matches packet.
Registered server_health inside bootstrap() right after server_ping (packet-specified insertion point).
startup.ts Phase 2 sets ctx.db = db; ctx.phase = "phase2" on success and leaves both untouched on failure (Phase 1 fallback behaviour — confirmed by the 538-test suite including an explicit Phase-2-throw test).

Sigma-locked conventions honored

src/__tests__/tools/health.test.ts test path (not tests/tools/...)
snake_case tool name (rejected by regex otherwise)
No AMS_* env vars introduced

Cross-worktree leaks detected during Step 1 pre-clean

None. The Wave C cross-worktree leak rule (git status + checkout non-owned files before analysis) found a clean HEAD at start.