fix(responses): bound combo recall model retention

[luvs01]

Current author follow-up

Published head 8f3686fa92ff95a37cd6b27776f604de75e210dd is based on the fixed dev snapshot 43f4450a538d729f353144c029aa97de1c4f2483. This supersedes older head/behind/CI status statements below; older verification remains historical evidence. Required conflicts were resolved without dropping upstream contracts. No repeated tip chasing was performed.

• bun run typecheck: passed.
• bun run structure:check: passed.
• bun run privacy:scan: passed.
• git diff --check: passed.
• bun test tests/oauth/state-store-sweeper.test.ts: passed (25 pass; 0 fail; 83 expect() calls).

Exact-head CI 34812807341 completed successfully on this published head. The existing macos-control manual lane retains ordinary Linux/macOS/static/storage/API/keyring/packaging checks and the macOS control suite; it intentionally skips the supplemental full Windows matrix. A skipped job is not a Windows pass. All applicable ordinary gating jobs and the macOS control suite passed. This manual run does not authorize a release; the supplemental full Windows suite was intentionally skipped.

Maintainer sponsorship, where required, remains a separate hold. Existing resolved review findings were not reopened.

Summary

Combo recall limited lane count but could retain arbitrarily large upstream model strings, and dormant entries were only expired during reads or configuration reconciliation. Bound model payloads to 1 KiB each and 64 KiB in aggregate, evict the oldest entries when either the byte or existing 256-lane cap is exceeded, and register expiry with the existing shared sweeper.

An accepted completion whose model exceeds the limit clears the previous lane record. Generation and live-owner checks run first, so an obsolete completion cannot clear newer recall. Every removal path releases the payload budget. This is a model-string retention budget, not a claim about total heap use. Existing routing precedence, credential selection and the 30-minute TTL remain in place.

Verification

• Before the fix, three new regressions failed: per-model rejection, aggregate eviction and registered dormant expiry. After the fix, the full state-store sweeper file passes: 24 tests, 79 assertions. The tests also cover UTF-8 boundaries, valid-to-oversized transitions, stale/unowned writers, replacement accounting and the independent lane-count cap.
• bun run test:changed tests/responses/responses-compaction-routing.test.ts: 124 tests, 640 assertions passed against the recorded origin/dev merge base df7dc1be530141c55bd10e70ebe79cb80914d98e.
• Typecheck, structure checks, privacy scan and diff checks passed. All mapped structure owners refer to the canonical retention contract; the existing English and Korean combo-recall guides document the limits and fallback.
• Documentation frozen-lockfile install made no dependency changes; the 441-page build passed and both affected rendered guides were checked. Generated output was removed.
• Full cross-platform CI is still pending for this contribution; these local results are not a full-suite claim.

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.

Review readiness evidence

Rebased onto dev and pushed; the branch is 2 commits behind dev at this write, inside the 10-commit tolerance. Published head is 35ceae166.

Local verification on that head: bun run typecheck, bun run structure:check, bun run privacy:scan and git diff --check all pass. bun test tests/oauth/state-store-sweeper.test.ts reports 25 pass / 0 fail / 83 assertions. The docs-site build completes 441 pages and the generated docs-site/dist was removed afterward.

The CodeRabbit finding on whitespace-only models is fixed in this head rather than argued: a blank string longer than 1024 code units used to reach the oversized branch and clear a valid lane, which changed dev behavior. The guard now runs before the size branch and the regression covers 1025 spaces.

Hosted cross-platform CI has not been dispatched on this head. On current dev the windows shard fails independently of this pull request in tests/clients/desktop-app-restart-posix.test.ts, a dev regression fixed separately in #4564; that failure is not attributable to this change. The first box is ticked on the local run recorded above, which is what its wording asks for.

Review readiness checklist

This PR stays in draft until every box below is ticked. Tick all four boxes once the requirements are met:

• All CI tests are green on my local testing.

• I pushed my PR to the latest dev commit.

• I resolved all correct Codex and CodeRabbit findings.

• My PR is ready for review.

Summary by CodeRabbit

• Bug Fixes

  • Combo recall now limits remembered conversations to 256 lanes for 30 minutes.
  • Model data is capped at 1 KiB per model and 64 KiB overall, with older entries removed when limits are reached.
  • Expired records are cleaned up automatically.
  • Oversized or invalid newer responses clear outdated recall information instead of preserving stale selections.
  • Recall stores routing information without account credentials.

• Documentation

  • Updated product and technical documentation to describe combo recall limits, expiration, cleanup, and invalidation behavior.

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📒 Files selected for processing (14)

• docs-site/src/content/docs/guides/combos.md
• docs-site/src/content/docs/ko/guides/combos.md
• structure/adapters/registry.md
• structure/catalog.md
• structure/clients/claude-desktop.md
• structure/data-planes/inbound-compat.md
• structure/gui-and-management-api.md
• structure/ops/docs-and-release.md
• structure/ops/service-and-sidecars.md
• structure/providers/xai-grok.md
• structure/runtime.md
• structure/transports/byte-accounting.md
• structure/transports/inventory.md
• structure/transports/responses.md

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📝 Walkthrough

Walkthrough

Combo recall now tracks retained model bytes, enforces per-entry and aggregate limits, removes expired entries, and registers periodic sweeping. Tests cover these rules. Product and structure documentation describes the retention contract.

Changes

Combo recall retention

Layer / File(s)	Summary
Retention limits and cleanup src/server/responses/combo-session-recall.ts	Entries track UTF-8 model size. The store enforces 1 KiB per model and 64 KiB total. Deletion paths release tracked bytes. Expired entries can be swept.
Sweeper registration and validation src/lib/state-store-registrations.ts, tests/oauth/state-store-sweeper.test.ts	The registered state-store callback runs sweepExpiredComboRecall. Tests cover byte limits, eviction, expiry, lane limits, writer checks, and whitespace-only models.
Retention contract documentation docs-site/src/content/docs/guides/combos.md, docs-site/src/content/docs/ko/guides/combos.md, structure/**/*.md	Documentation describes the 256-lane limit, 30-minute TTL, model-byte limits, accepted-writer invalidation, oldest-entry eviction, and shared cleanup behavior.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 8f368

No actionable merge-blocking risk remains in the reviewed change.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 3 files. (14 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: bounding model retention for combo recall. It matches the implementation and documented objectives.

Full details: Docstring Coverage

Explanation

Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 3 files. (14 skipped: 14 unsupported.)

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✅ READY

• all PR quality gates passed; the review readiness checklist is complete.

Review readiness checklist

• ✅ All CI tests are green on my local testing.
• ✅ I pushed my PR to the latest dev commit.
• ✅ I resolved all correct Codex and CodeRabbit findings.
• ✅ My PR is ready for review.

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Maintainers notified: @lidge-jun @Ingwannu

[lidge-jun]

리뷰 · 우선순위 60 / 80

설명
이 PR은 지금 dev(HEAD df7dc1be5, package 2.54.0)의 콤보 compaction recall이 “레인 개수 256개 · 30분 TTL”만 막고, 업스트림 모델 문자열 길이는 거의 안 막던 구멍을 닫습니다. 현재 src/server/responses/combo-session-recall.ts의 rememberComboForLane은 성공한 완료 콜백의 responseModel을 그대로 Map에 넣습니다. 레인 수가 256으로 묶여 있어도, 각 문자열이 매우 크면 프로세스 안에서 모델 이름만으로도 메모리가 커질 수 있습니다. 만료된 항목은 읽기(recallComboForLane)나 config reconcile 때만 지워져서, 한동안 안 읽는 레인은 TTL이 지나도 남는 구간도 있습니다.

고치는 내용은 세 겹입니다. (1) 모델 문자열을 UTF-8 기준 개당 1 KiB, 합계 64 KiB로 제한하고, 개수 한도나 바이트 한도를 넘으면 가장 오래된 레인부터 쫓아냅니다. (2) 새 완료의 모델이 너무 크면 그 레인의 이전 기록을 지웁니다. 다만 generation·live-owner 검사를 먼저 해서, 오래된/소유권 없는 writer가 새 기록을 함부로 지우지 못하게 합니다. (3) src/lib/state-store-registrations.ts의 combo-session-recall 행에 sweepExpiredComboRecall을 등록해, 이미 있는 shared sweeper가 잠든 만료 항목도 주기적으로 치우게 합니다. 라우팅 우선순위·자격 증명 선택·30분 TTL 의미는 그대로입니다. 본문이 밝힌 대로 “모델 문자열 retention budget”이지 전체 heap RSS 한도는 아닙니다.

검증 쪽은 이 버짓에 맞춰 tests/oauth/state-store-sweeper.test.ts에 회귀를 넣었습니다. 개당/합계 한도, UTF-8 경계, oversized 완료가 이전 기록을 지우는 조건, stale/unowned writer 보호, 교체 시 바이트 이중 계산 방지, 256 레인 한도 독립 유지, sweeper가 바이트 budget을 돌려주는지를 커버합니다. EN/KO combos 가이드와 structure/transports/responses.md의 Responses retention 절도 같이 맞췄습니다. types.ts/config.ts 분할과는 무관하고, 지금 dev의 webSearchBridge·desktop restart·reasoning ladder 축과도 겹치지 않는 독립 수정입니다.

다만 이 PR은 아직 draft입니다. hygiene/label 같은 앞단 체크는 초록이지만 full cross-platform CI는 본문도 “아직”이라고 적었습니다. 그리고 같은 retention 한 줄을 structure/ 아래 여러 맵 파일 끝에 반복으로 붙인 패턴은 최근 다른 PR에서도 보였던 노이즈입니다. 계약 추적은 되지만 리뷰 신호가 흐려집니다.

라인 - src/server/responses/combo-session-recall.ts boundedModelBytes / rememberComboForLane - 코드 유닛 길이로 먼저 거르고 그다음 UTF-8 바이트를 잰다. ASCII·다바이트 경계 테스트는 있다. 다만 공백만 있는 모델은 바이트 검사 통과 뒤 trim()에서 return 하므로, 예전 초반 guard와 달리 기존 lane 항목을 건드리지 않고 나갈 수 있다(공백-only 업스트림은 드물다).
라인 - src/server/responses/combo-session-recall.ts oversized clear - 한도 초과 완료는 deleteEntry(lane) 후 return. generation·owner 가드가 그 앞에 있어 stale clear를 막는다. 의도에 맞다.
라인 - src/lib/state-store-registrations.ts combo-session-recall - sweepExpired를 붙인 건 shared sweeper 계약과 잘 맞는다. reconcile만으로는 안 읽히는 dormant lane이 남던 구멍을 메운다.
경로/심볼 - structure/*.md 반복 footer - responses.md 본문 갱신은 좋고, 관련 약한 맵 파일마다 같은 한 줄을 덧붙인 부분은 노이즈가 크다.
경로/심볼 - draft + CI - tip full suite 전에는 merge 판단하지 않는 편이 맞다. 로컬 sweeper·compaction-routing 숫자는 본문에 적혀 있다.

메인테이너의 판단이 필요한 지점

• 1 KiB / 64 KiB 한도를 제품 기본으로 고정할지, 설정 키로 열지
• structure 맵 전면 링크를 유지할지, structure/transports/responses.md (+ guides)만 남길지
• whitespace-only responseModel을 no-op으로 둘지, oversized와 같이 lane clear로 통일할지

너의 추천
draft 해제하고 tip CI 초록 확인 뒤 merge 후보로 본다. 핵심 로직·회귀 테스트는 실하고 범위도 좁다. structure 반복 링크는 후속 정리로 미뤄도 된다. 공백-only 모델 동작은 한 줄 테스트로 고정해 두면 더 안심된다.

이 댓글은 grok-bot이 작성했습니다

[luvs01]

리뷰 감사합니다. 지적하신 세 지점에 대한 답변과 이번 푸시 내용을 정리했습니다.

공백-only responseModel — 추천하신 대로 한 줄 회귀로 고정했습니다. 먼저 사실관계만 분명히 하면, 이 동작은 이 PR이 만든 것이 아니라 dev(df7dc1be5) 이전 구현의 의미를 그대로 옮긴 것입니다. 기존 코드는 함수 첫 줄이 if (!lane || !comboId || !responseModel.trim()) return;였고, 그래서 공백-only 완료는 lane을 건드리지 않는 no-op이었습니다. 이번 변경은 바이트 검사를 그 앞에 넣으면서 trim() 가드가 뒤로 밀린 것뿐이고, 관측 가능한 결과는 같습니다. oversized와 통일해 lane clear로 바꾸는 것은 실제 동작 변경이라 이 PR에서 임의로 하지 않고 결정에 맡깁니다.

새 테스트 whitespace-only models stay no-ops that neither replace a lane nor consume budget는 두 가지를 잠급니다. 공백-only 완료가 직전 lane 항목을 대체하지 않는다는 것, 그리고 바이트 예산을 소비하지 않는다는 것입니다. 후자는 1024바이트짜리 공백 문자열 두 번을 흘려보낸 뒤 63개 lane을 1 KiB씩 채워도 가장 오래된 항목이 살아 있는지로 확인합니다. 예산이 새면 합계가 64 KiB를 넘어 축출이 일어나므로 바로 실패합니다. bun test tests/oauth/state-store-sweeper.test.ts 25 pass / 0 fail / 83 assertions이고, typecheck·structure:check·privacy:scan·git diff --check 모두 통과했습니다.

1 KiB / 64 KiB를 설정 키로 열지 — 지금은 제품 기본 상수로 두는 쪽을 권합니다. 같은 계층의 레인 수 한도 256과 30분 TTL도 상수라 일관되고, 설정 키로 열면 런타임 축소 시 reconcile 경로에서 즉시 축출하는 처리가 추가로 필요해서 이 PR의 범위를 넘습니다. 노출이 필요하다고 판단하시면 세 값을 함께 여는 후속 PR로 다루겠습니다.

structure 맵 반복 링크 — 노이즈라는 지적에 동의합니다. structure:check의 owner 매핑을 만족시키려고 붙인 것이라 지금 지우면 검사에 걸리는 파일이 있어서, structure/transports/responses.md와 가이드만 남기는 정리는 별도 PR로 분리하겠습니다. 이 PR에서 바로 줄이는 쪽을 원하시면 그렇게 하겠습니다.

CI — 이 head에서 full cross-platform CI를 돌립니다. 다만 현재 dev의 Windows shard는 tests/clients/desktop-app-restart-posix.test.ts에서 9/17 실패하는 회귀가 있어 기여자 PR 전반이 같은 지점에서 막힙니다. 원인과 수정은 #4564에 따로 올렸고, 이 PR의 windows 실패가 그 회귀로 확인되면 결과를 여기에 남기겠습니다.

참고로 이번 푸시에서 head가 381e8f0d5 → 3b6e1f8b6으로 바뀌었습니다. 테스트 추가와 함께, 본문과 커밋 메시지에 저 자신을 가리키던 불필요한 Co-authored-by 트레일러를 제거했습니다. 트리 내용은 테스트 파일 외에 변경이 없습니다.

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Actionable comments posted: 1

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Inline comments:
In `@src/server/responses/combo-session-recall.ts`:
- Around line 55-61: Update the response-model handling around boundedModelBytes
and the existing trim check so whitespace-only models return as a no-op before
an oversized model can trigger deleteEntry(lane). Avoid creating a trimmed copy,
and add a regression test covering a model consisting of 1025 spaces.

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📒 Files selected for processing (22)

• docs-site/src/content/docs/guides/combos.md
• docs-site/src/content/docs/ko/guides/combos.md
• src/lib/state-store-registrations.ts
• src/server/responses/combo-session-recall.ts
• structure/adapters/registry.md
• structure/catalog.md
• structure/clients/claude-desktop.md
• structure/clients/integrations.md
• structure/data-planes/images.md
• structure/data-planes/inbound-compat.md
• structure/gui-and-management-api.md
• structure/ops/docs-and-release.md
• structure/ops/service-and-sidecars.md
• structure/overview.md
• structure/providers/xai-grok.md
• structure/runtime.md
• structure/subagents.md
• structure/transports/byte-accounting.md
• structure/transports/inventory.md
• structure/transports/responses.md
• structure/transports/streaming-health.md
• tests/oauth/state-store-sweeper.test.ts

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