feat(logs): surface the account decision in the route explanation (#4546)

[lidge-jun]

Summary

Finishes the move-reason work from 030_move_reason_evidence.md. #4592 recorded the account decision and its cause on the usage entry; nothing surfaced it, so the field existed but no operator could read it without parsing usage.jsonl by hand.

GET /api/request-history/:id/route-decision — the endpoint behind ocx logs explain — now carries an affinity block alongside the route trace, because "the pool moved this conversation, and here is why" is part of the why-this-route answer. It is null for rows that have no account decision, including every row written before #4592.

PersistedUsageEntry gains the two typed fields it was already being written with.

Verification

• No local suite, typecheck, install or build was run, by explicit instruction. Hosted CI at the exact final head SHA is the only proof.
• Two regressions in tests/cli/route-explainability.test.ts: a row carrying rebound/quota_refusal explains with that exact block, and a row without an account decision explains with null rather than a fabricated one.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

Summary by CodeRabbit

• New Features
  • Request history route-decision details now include affinity information, showing the routing move and reason when available.
  • Entries without affinity information continue to show a null affinity value.

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-14T08:19:01.020407Z	fd43a93	PR opened

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• src/usage/log.ts

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📝 Walkthrough

Walkthrough

The change adds optional affinity data to persisted usage entries, validates and persists known values, and includes the data in the request-history route-decision response. Tests cover populated and absent affinity data.

Changes

Route decision affinity

Layer / File(s)	Summary
Persisted affinity contract and normalization src/usage/log.ts	PersistedUsageEntry adds optional affinity and affinityReason fields. Known-value guards validate both fields. Normalization drops unknown values and reasons without an affinity move, then persists defined values.
Route-decision response src/server/management/request-history-routes.ts, tests/cli/route-explainability.test.ts	The endpoint returns { move, reason } when entry.affinity exists and returns null otherwise. Tests cover both response forms.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: 🟡 Moderate · up to 40ff9

Real request-history entries lose account-move explanations, causing the new endpoint to return null for those requests.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: exposing account-decision data in the route explanation. It matches the endpoint and usage-log changes.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Commit unit tests in branch codex/260914-affinity-logs-surface

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[lidge-jun]

리뷰 · 우선순위 72 / 80

설명

이 PR은 #4546 cost-guard 안의 move-reason 작업(030_move_reason_evidence.md)을 마무리하는 관측 노출입니다. 파일은 세 개입니다. src/usage/log.ts, src/server/management/request-history-routes.ts, tests/cli/route-explainability.test.ts.

현재 dev HEAD 는 60fd850a3 (#4605, shared transient send budget) 입니다. 바로 앞 줄에는 #4604 affinity release-reason 신뢰성 수정과 #4592 live-binding move+reason 기록이 있습니다. #4592 는 resolveCodexAccountForThreadDetailed 가 결정과 원인을 돌려주고, pool auth context 가 그것을 들고, src/server/responses/core.ts 가 logCtx.affinity / logCtx.affinityReason 에 싣고, src/server/request-log.ts 가 appendUsageEntry 호출에 두 필드를 넣게 했습니다. 그런데 PersistedUsageEntry 타입과 normalizeUsageEntry 화이트리스트에는 두 필드가 아직 없습니다. 그래서 디스크에 쓰는 순간 값이 빠집니다. 운영자가 usage.jsonl 을 직접 열어도, ocx logs explain 이 읽는 route-decision 응답에도 계정 결정은 안 보입니다. 본문이 말한 “기록은 있는데 읽을 곳이 없다”보다 한 단계 더 깊은 구멍입니다. 지금은 기록 자체도 정규화 단계에서 사라집니다.

이 PR이 하려는 일은 맞습니다. PersistedUsageEntry 에 CodexAffinityMove / CodexAffinityReason 타입 필드를 추가하고, GET /api/request-history/:id/route-decision 응답에 affinity: { move, reason } 또는 null 을 붙입니다. ocx logs explain(src/cli/observe.ts 약 115-124줄) 은 이미 그 엔드포인트 JSON 전체를 그대로 찍으므로, API만 채우면 CLI 도 같이 보입니다. 회귀 두 개도 방향이 좋습니다. rebound/quota_refusal 이 그대로 나오고, 결정이 없는 행은 null 입니다.

문제는 구현이 반만 왔다는 점입니다. diff 는 타입 선언과 응답 조립, 테스트만 건드립니다. normalizeUsageEntry(src/usage/log.ts 약 584-669줄) 는 여전히 허용 필드만 다시 조립합니다. 여기에는 affinity / affinityReason 이 없습니다. appendUsageEntry 는 쓰기 전에 항상 이 함수를 탑니다. 읽기(normalizePersistedUsageRow) 도 같은 함수를 탑니다. 그래서 테스트가 appendUsageEntry({ ... affinity: "rebound", affinityReason: "quota_refusal" }) 를 넣어도 파일에는 두 필드가 없고, requestHistoryRowById 가 읽는 행에도 없고, 응답 affinity 는 null 이 됩니다. 새 회귀는 Exact-head CI 에서 실패할 가능성이 큽니다. 반대로 말하면, 이 한 군데만 화이트리스트에 넣으면 타입·엔드포인트·테스트가 한꺼번에 살아납니다.

현재 dev 방향과도 잘 맞습니다. cost-guard 줄에서 #4592 기록이 켜졌고 #4604 가 사유 신뢰성을 고쳤으며 #4605 가 send-budget 을 닫았습니다. 이제 남은 관측 구멍은 “왜 움직였는지”를 ocx logs explain 한 곳에서 읽는 일입니다. types.ts/config.ts 분할과 무관하고, 중복 PR로 보이지 않습니다.

라인 (PR이 추가한 PersistedUsageEntry.affinity / affinityReason) - 타입만 넣고 normalizeUsageEntry 통과를 안 넣었습니다. 이게 이 PR의 핵심 막힘입니다. transportPhase / terminalSource 처럼 알려진 값 집합으로 걸러서 통과시키는 패턴이 이미 옆에 있습니다. CodexAffinityMove / CodexAffinityReason 유니온을 같은 방식으로 화이트리스트에 넣어야 합니다.

라인 (PR 응답 조립 affinity: entry.affinity ? { move, reason: entry.affinityReason ?? null } : null) - 모양이 좋습니다. move 만 있고 reason 이 빠진 옛/불완전 행도 reason: null 로 안전하게 나갑니다. 다만 지금 dev 에서는 entry.affinity 자체가 정규화 때문에 거의 항상 비어 있어, 이 분기는 살아도 값이 안 나옵니다.

경로 tests/cli/route-explainability.test.ts 새 두 케이스 - 의도한 계약을 정확히 찌릅니다. 그런데 appendUsageEntry → normalizeUsageEntry 경로를 타므로, 정규화 수정 없이는 rebound 케이스가 실패합니다. null 케이스는 우연히 통과할 수 있습니다. CI 빨간불이 나오면 테스트가 틀린 게 아니라 화이트리스트 누락을 증명하는 신호로 보면 됩니다.

경로 src/cli/observe.ts explain - 추가 변경이 없어도 됩니다. API 응답 전체를 찍기 때문입니다. 사람 읽기 전용 pretty 포맷이 따로 있다면 후속으로 affinity 한 줄을 넣어도 되지만, 이번 범위의 필수 조건은 아닙니다.

경로 #4592 잔여 - #4592 커밋(849f3c9cc) 은 src/usage/log.ts 를 건드리지 않았습니다. 그래서 “이미 기록됨” 전제는 아직 성립하지 않습니다. 이 PR이 그 구멍을 같이 막아야 본문 설명이 맞습니다.

메인테이너의 판단이 필요한 지점

• normalizeUsageEntry 에 affinity 화이트리스트를 이 PR에서 반드시 넣고 CI 재실행할지 (추천: 예, 없으면 기능이 안 켜짐)
• move/reason 을 isKnownTransportPhase 식 집합 가드로 엄격히 걸지, 타입만 믿고 통과시킬지
• feat(codex): record why a live binding was kept, moved, or released (#4546) #4592 이후 이미 쌓인 usage.jsonl 에는 affinity 가 없을 수 있음 — 문서/릴리즈 노트에 “이 버전부터 새 행만 explain 에 보임”을 명시할지
• Exact-head CI 초록을 merge 조건으로 둘지 (추천: 예 — 특히 새 회귀가 정규화 수정을 검증함)
• types.ts/config.ts 분할과 무관 — close-don't-rebase 대상 아님

너의 추천

normalizeUsageEntry(그리고 필요하면 읽기 경로가 공유하는 같은 함수)에 affinity/affinityReason 통과를 추가한 뒤 Exact-head CI 초록을 확인하고 dev 에 병합하세요. 엔드포인트 모양과 테스트 계약은 유지해도 됩니다. 정규화 한 곳이 빠지면 이 PR은 “노출”이 아니라 “타입만 있는 빈 상자”로 남습니다. 머지 후 #4546 wp3 관측 노출은 닫힌 것으로 보고, 다음 cost-guard 남은 일(#4590 base-prompt, #4587 web_search replay 등)로 넘어가면 됩니다.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Persist affinity fields through the usage-log pipeline

For every request carrying an affinity decision, addFinalRequestLog adds these fields to the in-memory entry, but addRequestLog rebuilds the object passed to appendUsageEntry without them and normalizeUsageEntry also omits them. Because requestHistoryRowById reads and normalizes the persisted usage.jsonl row, this endpoint always receives undefined and returns affinity: null; even the new appendUsageEntry regression loses the values before indexing. Thread both closed-enum fields through the persistence projection and normalization.

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[chatgpt-codex-connector]

Document the new affinity response block

This changes the user-visible JSON returned by both the management endpoint and ocx logs explain, but the operator references still describe the explanation as only trace, attempts, and outcome, while the documented CLI JSON shape omits affinity. Update the English reference, its translated counterparts, and the CLI JSON-shape reference so operators can interpret move, reason, and the legacy null case.

AGENTS.md reference: AGENTS.md:L380-L381

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Inline comments:
In `@src/usage/log.ts`:
- Around line 196-197: Update normalizeUsageEntry and the addRequestLog field
projection to preserve the optional affinity and affinityReason fields supplied
by addLog, ensuring appendUsageEntry and requestHistoryRowById retain them
through usage.jsonl serialization and hydration.

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