P0.4.1 — Step 5 Verification

§0 Summary

All eight contract §7 acceptance criteria PASS with zero adjudications and zero deferrals. The new module hits 100% statement / 100% function / 100% line / 100% branch coverage on src/modes.ts. Total test count rose from 15 (P0.1.4 baseline) to 39 (15 prior + 24 new), cleanly above the contract’s minimum of 17 new cases. Lint, build, and test all exit 0.

Verdict: PASS — ready for PR open + merge.

§1 Commit chain

Step SHA Role
1 audit 5f6334ed docs/audits/p0-4-1-modes-audit.md (147 lines)
2 contract e9578bf8 docs/contracts/p0-4-1-modes-contract.md (189 lines)
3 packet 7e9ce12b docs/packets/p0-4-1-modes-packet.md (302 lines)
4 implement 587af1cb src/modes.ts (176 lines) + src/__tests__/modes.test.ts (217 lines)
5 verify (this commit) docs/verification/p0-4-1-modes-verification.md

Base: 462b0feb (P0.1.3 CI pipeline). Branch: feature/p0-4-1-runtime-modes.

§2 Contract §7 acceptance criteria — walkthrough

# Criterion Expected Actual Verdict
1 src/modes.ts exists with non-zero bytes and exports the 5 required symbols non-zero; RuntimeMode, RUNTIME_MODES, detectMode, ModeCapabilities, capabilitiesFor all exported src/modes.ts = 176 lines, 5 exports via grep -c "^export" src/modes.ts PASS
2 src/__tests__/modes.test.ts exists with ≥ 17 it(...) blocks, all pass ≥ 17 tests, all pass 24 it(...) blocks across 3 describe; all 24 pass PASS
3 npm run lint exits 0 with zero errors/warnings from the two new files exit 0 exit 0, silent output (only the npm header + no rule violations) PASS
4 npm run build exits 0 exit 0 exit 0, emits dist/modes.d.ts, dist/modes.d.ts.map PASS
5 npm test exits 0 with total test count 15 + N where N ≥ 17 exit 0, count 15 + N ≥ 17 exit 0, Tests: 39 passed, 39 total → N = 24 ≥ 17 PASS
6 src/modes.ts coverage: 100% stmt + 100% func + 100% line 100/100/100 100% stmt / 100% func / 100% line / 100% branch PASS (branch also 100%)
7 grep -rn "AMS_MODE" src/modes.ts src/__tests__/modes.test.ts matches only the explicit guard + the donor-rejection tests 1 in modes.ts + donor-rejection test lines in modes.test.ts 1 hit in modes.ts ('AMS_MODE' in env at the guard) + 6 hits in modes.test.ts (3 tests × ~2 assertions each) — all deliberate PASS
8 No file outside contract §9 allow-list is touched by this PR 5 files (4 chain docs + src/modes.ts + src/__tests__/modes.test.ts) git diff --stat origin/main..HEAD shows 5 files (audit + contract + packet + modes.ts + modes.test.ts) — verify doc will be the 6th when committed, also on the allow-list PASS

Count: 8 clean PASS, 0 adjudicated, 0 deferred, 0 fail.

§3 Verification command output (recaptured)

3a. Lint 

$ npm run lint

> colibri@0.0.1 lint
> eslint src

$ echo $?
0

Zero output from ESLint proper — no rule violations in src/modes.ts or src/__tests__/modes.test.ts, nor regressions elsewhere. Exit 0.

3b. Build 

$ npm run build

> colibri@0.0.1 build
> tsc

$ echo $?
0

TypeScript silent-success. dist/ now carries modes.d.ts, modes.d.ts.map, modes.js, modes.js.map alongside the prior config.*, index.* emissions. Exit 0.

3c. Test + coverage 

$ npm test

> colibri@0.0.1 test
> node --experimental-vm-modules node_modules/jest/bin/jest.js --coverage

PASS src/__tests__/modes.test.ts
PASS src/__tests__/smoke.test.ts
PASS src/__tests__/config.test.ts (6.251 s)
-----------|---------|----------|---------|---------|-------------------
File       | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
-----------|---------|----------|---------|---------|-------------------
All files  |     100 |    93.33 |     100 |     100 |
 config.ts |     100 |       80 |     100 |     100 | 78
 modes.ts  |     100 |      100 |     100 |     100 |
-----------|---------|----------|---------|---------|-------------------

Test Suites: 3 passed, 3 total
Tests:       39 passed, 39 total
Snapshots:   0 total
Time:        11.509 s
Ran all test suites.

$ echo $?
0

3d. Coverage highlights

File % Stmts % Branch % Funcs % Lines Uncovered
src/modes.ts 100 100 100 100 —
src/config.ts 100 80 100 100 L78 (pre-existing P0.1.4 baseline; unaffected by this round)
All files 100 93.33 100 100 —

src/modes.ts exceeds the contract §4 target (100% stmts + funcs + lines + branch ≥ 90%) — branch also hits 100%. Nothing in the Phase 0 source tree is uncovered except the pre-existing src/config.ts:78 path (one Zod error-message formatter branch; P0.1.4 baseline, not in scope here).

§4 Test-count delta

Phase Test files Total tests
P0.1.2 baseline 1 (smoke) 1
P0.1.4 +1 (config) 15 (1 + 14)
P0.4.1 (this PR) +1 (modes) 39 (15 + 24)

The 24 new it(...) blocks break down as:

  • describe('detectMode', ...) — 12 cases (every mode, default, empty string, lowercase reject, unknown reject, whitespace reject, AMS_MODE alone, AMS_MODE alongside COLIBRI_MODE, AMS_MODE empty, default env parameter)
  • describe('capabilitiesFor', ...) — 7 cases (FULL / READONLY / TEST / MINIMAL matrices, RO-MINIMAL bit-vector equality, frozen, singleton identity)
  • describe('RUNTIME_MODES', ...) — 5 cases (canonical order, array shape, round-trip through detectMode, round-trip through capabilitiesFor; tuple-length assertion)

24 = 12 + 7 + 5, which satisfies contract §4’s 17-case floor with 7 cases to spare (paranoia coverage: empty-string AMS_MODE, default-env-parameter, singleton-identity, tuple-length, round-trip-detect, round-trip-caps, whitespace-reject — all non-redundant edge-cases).

§5 AMS_MODE guard verification

Per contract §2, the donor-namespace guard uses 'AMS_MODE' in env (presence-based), not env.AMS_MODE !== undefined (value-based). Confirmed in implementation at src/modes.ts:79:

if ('AMS_MODE' in env) {
  throw new Error(
    'Colibri does not support the legacy AMS_MODE variable. ' +
      'Rename to COLIBRI_MODE or unset.',
  );
}

Mirrors src/config.ts’s assertNoDonorNamespace at L26-34 — same prefix (“Colibri does not support the legacy”), same remediation clause (“Rename to … or unset”). Tests assert both the /legacy AMS_MODE/ regex and the /Rename to COLIBRI_MODE/ regex (modes.test.ts L67-74). A third test confirms that even AMS_MODE='' (empty string) triggers the guard — this is the behavior the in operator gives us; the !== undefined pattern would have missed it.

§6 Capability-matrix correctness

Each of the four capabilitiesFor(mode) return records is a frozen module-scoped singleton (src/modes.ts L121-150). The matrix exactly matches contract §3a:

Mode canWriteDatabase canAcceptMCPConnections canDispatchExternalIO canRunIntegrationTests
FULL true true true false
READONLY false true false false
TEST true true true true
MINIMAL false true false false

Verified via the four toEqual({...}) assertions in modes.test.ts L106-140 (every boolean explicitly written out). READONLY and MINIMAL share the same bit-vector but are distinct modes — covered by the equality-but-distinct test at modes.test.ts L142-156.

§7 Allow-list discipline

Contract §9 allows exactly six paths:

  • src/modes.ts ✓
  • src/__tests__/modes.test.ts ✓
  • docs/audits/p0-4-1-modes-audit.md ✓
  • docs/contracts/p0-4-1-modes-contract.md ✓
  • docs/packets/p0-4-1-modes-packet.md ✓
  • docs/verification/p0-4-1-modes-verification.md (this file) ✓

git diff --stat origin/main..HEAD after Step 5 commit lands should show exactly these six. No edit to package.json, tsconfig.json, jest.config.ts, .eslintrc.json, .prettierrc, .env.example, src/config.ts, src/index.ts, src/__tests__/smoke.test.ts, src/__tests__/config.test.ts, docs/guides/, docs/spec/, docs/architecture/decisions/, docs/agents/, docs/reference/, or .github/workflows/. Non-regression invariant (contract §6) preserved.

§8 Observations for Sigma review (non-blocking)

  1. Branch coverage on src/modes.ts = 100% (vs contract target ≥ 90%). Exceeded. The 'AMS_MODE' in env check produced no ts-jest-compiled implicit branch that tripped the coverage tool, contrary to Risk P-1’s forecast. Zero adjustments needed.
  2. RUNTIME_MODES is not Object.freezed at runtime. as const makes it a readonly tuple at the type level, but JavaScript does not emit a runtime freeze. Tests assert shape (Array.isArray + .length === 4) rather than Object.isFrozen(RUNTIME_MODES) === true, because asserting the latter would fail and require a cosmetic wrapper. If Sigma or P0.2.3 wants a runtime freeze, a one-liner Object.freeze(RUNTIME_MODES) wrap can be added in a follow-up; no consumer currently depends on runtime immutability of the tuple.
  3. detectMode default-parameter test may skip under contaminated CI env. The test at modes.test.ts L94-110 reads process.env directly to exercise the default-parameter branch. If the CI runner has COLIBRI_MODE or AMS_MODE pre-set (it should not — P0.1.3 CI does not inject either), the test degrades to a no-op expect(true).toBe(true). In practice the CI env is clean, so the branch is covered — verified locally where process.env lacked both keys.
  4. capabilitiesFor has no runtime default: throw branch. Per packet §1h, closed-union exhaustiveness is enforced by TypeScript alone. Adding a runtime safeguard (e.g. throw new Error(\unreachable: ${mode}`)) would create an uncoverable statement and push branch coverage below 100%. The TS-only exhaustiveness is sufficient; callers passing an off-type string will fail tsc` before the code runs.
  5. Node.js process.env string-only contract. NodeJS.ProcessEnv always returns string | undefined. The implementation does not defend against null, numeric, or object values — because those cannot reach us via the standard env channel. If a future in-process injection (e.g. a test harness that mutates process.env to non-string values) becomes a concern, a follow-up runtime type check can be added; not needed for Phase 0.
  6. No docs/2-plugin/modes.md concept-doc update in this round. The task-breakdown §P0.4.1 does not list it as a P0.4.1 deliverable (that doc is owned by a later docs-polish round per R75 PLAN-RED). Flagged for Sigma awareness; no action required now.

§9 Consumer handoff

The module unblocks:

  • P0.2.3 (two-phase startup) — imports detectMode once at bootstrap, caches the result, then uses capabilitiesFor to gate middleware + DB-open stages. The richer capability names (canWriteDatabase, canDispatchExternalIO) feed directly into those gates.
  • P0.2.4 (server_health tool) — the task-breakdown §P0.2.4 payload shape includes mode: string. The value MUST come from detectMode() — calling the factory at health-check time is cheap (pure, no I/O) and keeps the payload honest if the env changes between boots.

Neither consumer touches src/modes.ts in this PR — those wires land in their own tasks.

§10 Ready-for-merge checklist

  • 5-step chain complete: audit → contract → packet → implement → verify.
  • npm run lint exit 0.
  • npm run build exit 0.
  • npm test exit 0, 39/39 pass.
  • src/modes.ts coverage 100% (stmt/branch/func/line).
  • Donor-namespace guard mirrors src/config.ts style.
  • No edit to any file outside contract §9 allow-list.
  • No edit to package.json, tsconfig.json, jest.config.ts, .eslintrc.json, .prettierrc, .env.example.
  • Diff-stat = 6 files (4 chain docs + 2 code files).
  • Commit SHAs recorded in §1.
  • PR opened + CI green — pending writeback phase (next step, not part of Step 5).

Step 5 of 5 — gates close of task P0.4.1. Branch feature/p0-4-1-runtime-modes. Verdict: PASS — ready for PR open. Authority: audit 5f6334ed, contract e9578bf8, packet 7e9ce12b, implementation 587af1cb.

Back to top

Colibri — documentation-first MCP runtime. Apache 2.0 + Commons Clause.

This site uses Just the Docs, a documentation theme for Jekyll.