fix(mint): thread traceWriter into phase forks so they emit lifecycle events

[griffinwork40]

Why

/mint's 8 phase functions (src/skills/mint/_phases/*.ts) each construct their own SubagentManager without the session's trace writer:

const manager = new SubagentManager({
  ...(parentCwd !== undefined ? { cwd: parentCwd } : {}),
  ...(parentReadRoots !== undefined ? { parentReadRoots } : {}),
  // no traceWriter
});

emitSubagentLifecycle no-ops without a writer (trace/emit.ts), so mint phase forks emitted zero subagent_lifecycle events — the last dispatch path still invisible in the witness trace after #466 fixed the agent-tool and compose paths. Confirmed by absence: no trace in the corpus ever carried a mint-* agentType, even though the phases set one (e.g. agentType: 'mint-research').

What

Thread ctx.traceWriter — already available on SkillExecutionContext (skills/index.ts) and used identically by user-skills.ts — from the mint handler through runPhasesAfterSpec into every phase and into their fork managers:

• mint/index.ts — resolve ctx.traceWriter once, thread it to runSpecPhase and runPhasesAfterSpec, and from there to all 7 downstream phase calls.
• _phases/*.ts (all 8) — accept an optional trailing traceWriter?: TraceWriter and spread it into the SubagentManager options (mirrors the existing parentReadRoots threading). heal.ts also forwards it to its re-run runVerifyPhase.

Scope / notes

• Additive & backward-compatible — optional trailing param; resume/test paths without a ctx degrade to the prior no-writer behavior, unchanged.
• Mirrors the merged root-manager fix (fix(trace): make agent-tool and compose forks visible in the witness trace #466) and user-skills.ts — same pattern, same ctx.traceWriter source.
• Complements the sibling PR that adds resolvedAgentType to the trace/routing telemetry: once both land, a mint run's phase forks are both visible AND type-attributed.
• Deferred follow-up: a CI audit:trace-writer gate (mirroring audit:env:check) asserting every new SubagentManager( in src/skills/src/agent/tools threads a writer would prevent this class of gap from recurring (it recurred once — roots fixed in fix(trace): make agent-tool and compose forks visible in the witness trace #466, mint missed).

Test

mint.test.ts (the mocked-SubagentManager suite) asserts every phase's fork manager is constructed with the writer when ctx.traceWriter is set, and without it when absent. pnpm lint clean; all 55 mint tests pass (53 existing + 2 new).

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
agent-afk-docs	Ready	Preview, Comment	Jul 24, 2026 8:55pm

[chatgpt-codex-connector]

💡 Codex Review

agent-afk/src/skills/mint/_phases/parallelize-dispatch.ts

Line 85 in fe2f3dc

const waveOrchestration = await parallelize.handler({ plan });

Pass trace context to registered parallelize handlers

When a TS parallelize skill is registered, this branch wins over the plugin-body fallback below, but the newly threaded traceWriter is still not passed into the handler. SkillMetadata.handler accepts the execution context as its third argument, so a registered override that forks subagents with its own SubagentManager remains invisible in the durable witness trace even though the plugin fallback now receives the writer. Pass a context containing the writer (and the same model/callId fields as applicable) instead of calling the handler with only { plan }.

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[griffinwork40]

🤖 Automated review (hourly sweep), generated by the /review tool — a maintainer will follow up.

---

Code Review — PR #696

fix(mint): thread traceWriter into phase forks so they emit lifecycle events
Regime: light (10 files, +124/−9 = 133 lines) · Reviewed ref: fe2f3dc
Stated intent: PR #696 title + body — spec-compliance assessed.

Merge decision: ✅ MERGE

The fix does exactly what it claims. All 8 phase construction sites are threaded, the positional argument plumbing is correct at every call site, and the change is genuinely additive. One medium test-coverage finding below — the new regression test is weaker than the PR body claims, but it does not block the fix itself.

---

Findings

1. medium · confidence: high · test-coverage

src/skills/mint.test.ts:1031-1034 · ref:fe2f3dc · citation-type: diff-context

finding: The new test's loop asserts traceWriter only over whichever managers the mock happened to construct and asserts no exact count, so it never exercises the parallelize-dispatch.ts or ship.ts construction sites — both are structurally unreachable under this mock — meaning a regression that drops the spread from either file still passes this test green.

evidence:

const ctorCalls = vi.mocked(SubagentManager).mock.calls;
expect(ctorCalls.length, 'at least one phase fork manager constructed').toBeGreaterThan(0);
for (const [opts] of ctorCalls) {
  expect((opts as { traceWriter?: unknown } | undefined)?.traceWriter).toBe(traceWriter);
}

Two independent short-circuits make those two sites unreachable in this test:

• parallelize skipped. plan.ts:75 returns planResult.message.content verbatim; the mock sets that to the literal `Mocked ${idPrefix} output` (mint.test.ts:76), which contains no path-like token. countFileReferences therefore returns 0, and parallelize-dispatch.ts:73-75 returns {kind:'skipped'} before the new SubagentManager( at line 111 is ever reached.
• ship never runs. forkVerifyMode derives passed solely from output.status === 'PASS' (verify.ts:94), and the mock hard-codes status:'FAIL' for every mint-verify-* fork (mint.test.ts:65-70). The heal loop exhausts HEAL_ITERATION_CAP = 2 (index.ts:303) and index.ts:325-334 returns {paused:true, phase:'heal-failed'} before runShipPhase at index.ts:337.

So the assertion covers 6 of 8 sites while the PR body states it covers every phase.

suggestion: Assert an exact ctorCalls.length (or assert the set of idPrefix values seen), and make the mocked plan content carry ≥3 path tokens plus a passing verify mock so the run actually reaches parallelize and ship.

Note — the mock-leakage failure mode was checked and does not apply: vi.clearAllMocks() runs in the file's beforeEach (mint.test.ts:101), so the second test does not observe the first test's constructor calls.

---

Dimension summary

Dimension	Verdict	Severity
Correctness	clean	—
Spec-compliance	clean	—
Test-coverage	1 finding	medium
API-compat	clean	—
Security	clean	—
Perf-observability	clean	—

Correctness — no issues found; read all 9 source files at fe2f3dc. Every new trailing param lands in the right positional slot. runSpecPhase is declared with 7 params (spec.ts), and index.ts:407 passes ..., defaultSubagentModel, undefined, ctx?.traceWriter — undefined correctly occupies the 6th parentReadRoots slot. runPhasesAfterSpec (7 params, index.ts:168) is called at index.ts:386 and index.ts:426, both with 7 in-order args. heal.ts:164-173 → runVerifyPhase (8 params, verify.ts:101) matches position-for-position. verify.ts:127-129's three forkVerifyMode calls each pass 10 args identically. In parallelize-dispatch.ts:111-116 the conditional spreads use distinct keys from the unconditional parentAbortSignal, so no key is clobbered. No argument shift anywhere.

Spec-compliance — no issues found. git ls-tree at the ref shows exactly 8 files in _phases/, and git grep 'new SubagentManager(' finds exactly 8 construction sites, one per file — every one carrying ...(traceWriter !== undefined ? { traceWriter } : {}). The "all 8 phases" claim holds at the source level. No scope creep: the diff is import + trailing param + spread, repeated, plus the two tests.

API-compat — no issues found (reachability pre-check performed). git grep across src/ for all 8 exported phase functions found zero production callers outside src/skills/mint/; the only other references are three mint test files. The "additive & backward-compatible" claim is corroborated by pre-existing call sites such as runSpecPhase('idea','sess',undefined,undefined,MODEL) (mint-phase-incomplete-guard.test.ts:166) remaining valid.

Security — no issues found; read src/agent/subagent.ts and src/agent/trace/{emit,types}.ts at the ref. traceWriter is a declared field on SubagentManagerOptions (no index signature), emitSubagentLifecycle no-ops on if (!writer) return; (emit.ts:64 — confirming the PR's stated premise), and SubagentLifecyclePayload is a narrow shape carrying systemPromptHash rather than raw prompt text. No credential or writer object enters the payload. This diff adds no new exposure surface; it wires an already-shipped mechanism (#466) into more call sites.

Perf-observability — no issues found. Each spread is a single O(1) conditional key add at manager-construction time, bounded to ~10 per mint run by HEAL_ITERATION_CAP = 2. Not per-token, not in a hot loop.

---

What was not checked

• Ref read: all Wave 1 citations were independently re-verified against branch HEAD fe2f3dc. Verification manifest: 0 fabricated, 0 false-absent, 0 diff-only — every cited line exists at the reviewed ref.
• Absence claims grounded by grep: the claim that no other test covers traceWriter threading for parallelize-dispatch.ts/ship.ts was checked with git grep -c 'traceWriter' fe2f3dc -- src/skills/mint-parallelize-dispatch.test.ts src/skills/mint-failed-parallelize.test.ts → zero matches in both.
• Not executed: pnpm test / pnpm lint were not run. The PR's "55 mint tests pass, lint clean" claim is unverified here; all conclusions are static analysis against the reviewed ref. CI on this head is green except the Test (windows-latest) job, which is red across sibling PRs #698/#700/#701/#702 on this repo and appears pre-existing rather than introduced by this change — not independently confirmed.
• Not reviewed: the runtime shape of emitted subagent_lifecycle events during a real mint run (no live trace corpus inspected), and the "mirrors #466 / user-skills.ts" claim beyond confirming the spread idiom matches.
• The deferred audit:trace-writer CI gate named in the PR body is explicitly out of scope and was not evaluated. It would mechanically prevent the recurrence class the PR describes.

_{Read-only review — no files, branches, or PR state were modified.}