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fix(responses): bound combo recall model retention - #4525

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@luvs01 luvs01 commented Sep 13, 2026

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Summary

Bound the combo recall model-retention cache so request history cannot accumulate an unlimited number of remembered model entries. Preserve the established per-request selection and fallback behavior.

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Summary by CodeRabbit

  • Bug Fixes

    • Combo recall now limits remembered conversations to 256 lanes for 30 minutes, with automatic cleanup of expired records.
    • Model data is capped at 1 KiB per model and 64 KiB overall; older entries are removed when limits are reached.
    • Oversized or invalid newer responses clear outdated recall information, while stale responses cannot overwrite or clear current selections.
    • Recall stores routing information without account credentials.
  • Documentation

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

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  • structure/adapters/registry.md
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  • structure/gui-and-management-api.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 6c070

The retention limits, expiry cleanup, and documented behavior have focused coverage; no unresolved merge-blocking risk is identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

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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. (15 skipped: … Write docstrings for the functions missing them to satisfy the coverage threshold.
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Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly and concisely describes the main change: bounding combo recall model retention with per-model and aggregate limits.
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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. (15 skipped: 15 unsupported.)

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Deterministic PR hygiene checks passed.

@github-actions github-actions Bot added the bug Something isn't working label Sep 13, 2026
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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.tsrememberComboForLane은 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.tscombo-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
luvs01 force-pushed the agent/combo-recall-budget-20260913 branch from 8d22c17 to 3b6e1f8 Compare September 14, 2026 00:41
@luvs01

luvs01 commented Sep 14, 2026

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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 381e8f0d53b6e1f8b6으로 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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luvs01 force-pushed the agent/combo-recall-budget-20260913 branch from 3b6e1f8 to e3e2e71 Compare September 14, 2026 01:07
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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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  • docs-site/src/content/docs/guides/combos.md
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  • src/server/responses/combo-session-recall.ts
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Comment thread src/server/responses/combo-session-recall.ts Outdated
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Approved on exact head 8f3686fa92ff95a37cd6b27776f604de75e210dd.

The production path is bounded coherently: generation and live-owner checks happen before any oversized completion may clear a lane; replacement uses delete-before-set so byte accounting is refunded once; the per-model UTF-8 cap, 64 KiB aggregate cap and independent 256-lane cap converge through the same deletion helper. Whitespace-only responses preserve the prior no-op contract, and dormant TTL expiry is now attached to the shared sweeper.

The focused suite covers byte boundaries, multibyte input, aggregate/count eviction, stale writers, replacement accounting and sweep expiry. The author exact-head ordinary hosted graph is green; the skipped supplemental Windows lane is not counted as proof, but this Map/TextEncoder path is platform-neutral. This approval is not a merge action.

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…mbo-recall-budget-20260913

Co-authored-by: luvs01 <27862058+luvs01@users.noreply.github.com>
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lidge-jun added a commit that referenced this pull request Sep 16, 2026
The remembered model id is provider-reported and arrives on the response, so
nothing upstream of the recall store bounds its length. Lane keys are already
SHA-256 digests, which means the 256-lane cap bounded the number of entries but
not the bytes those entries held. A long-running process could accumulate
arbitrarily large remembered strings.

Bound retention on two more axes: 1 KiB per remembered model id and 64 KiB in
aggregate. The size test runs on code units before encoding, because a UTF-8
encoding is never smaller than its code-unit count, so the bound never pays the
allocation it exists to prevent. Aggregate eviction drops the least recently
written lane, which is the front of the map because every write re-inserts its
own lane at the back. A single entry is capped far below the aggregate budget, so
a write can never evict itself.

Every removal now goes through one helper that releases the entry's bytes, so the
counter cannot drift from the map through the read-time invalidation path, the
reconciliation path, or a lane rewrite.

An unretainable model id DECLINES the write rather than clearing the lane. That
is the ordering-sensitive part. This callback carries a config generation, not a
request order, so two accepted completions on one lane under the same generation
can arrive out of order; a clearing branch would let the older one erase the
newer selection. Declining matches how every other rejection in
rememberComboForLane already returns, and leaves the established contract intact:
an older response never overwrites or clears a newer one.

Register the store for periodic expiry as well. The TTL was previously evaluated
only on read or on a generation change, so a lane that is never read again held
its entry until the process exited.

Closes #4525

Co-authored-by: luvs01 <27862058+luvs01@users.noreply.github.com>
Move the unchanged combo recall retention reference into the Lifecycle section
instead of appending it at EOF, where dev adds the independent combo default
effort precedence contract. Preserve both contracts without changing runtime
code, tests, or rewriting existing history.

Validation: verified the original PR and dev document blob hashes; reproduced
the original conflict with git merge-file and confirmed the relocated paragraph
merges cleanly with dev 3070d64.
This is document-level merge validation, not a new application test-suite run.

luvs01 commented Sep 16, 2026

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병합 충돌을 기존 PR 브랜치에서 해소했습니다.

  • 새 head: fa2f27335334034b9aedfe42a1d577a3031e2ddd (docs(runtime): resolve combo recall merge conflict with dev)
  • 변경 범위: structure/runtime.md 한 파일에서 기존 combo recall 보존 규칙 문단을 내용 변경 없이 Lifecycle 절로 이동했습니다. dev가 파일 끝에 추가한 Combo default effort precedence 절과의 충돌을 없애며, 양쪽 설명을 모두 보존합니다. 이번 커밋에서 실행 코드와 테스트는 변경하지 않았습니다.
  • 검증: 원본/상류 문서의 Git blob SHA 일치 확인, git merge-file로 기존 충돌 1건 재현 및 수정 후 충돌 0건 확인, 문단 중복·누락과 공백 오류 검사. 기준 dev3070d64d8822c6d8c62989665f82ab665e4d164c입니다.
  • 반영 후 GitHub가 mergeable: true를 반환했습니다. 강제 푸시나 이력 재작성 없이 기존 head의 후속 커밋으로 반영했으며, PR 자체를 병합하거나 닫지 않았습니다.

검증 범위 주의: 이번 검증은 문서 및 병합 충돌 검증이지 전체 애플리케이션 테스트 재실행이 아닙니다. 새 head의 Cross-platform CI (35048211240)와 React Doctor (35048211281)는 확인 시 action_required 상태입니다. 본문의 기존 head 6c070f8에 대한 CI 성공 기록을 새 head의 테스트 성공으로 간주하지 않습니다.

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expect(reconcileLiveStateStores()).toEqual({ storesVisited: 1, rowsRemoved: 2 });
});

describe("combo recall byte budget", () => {

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P1 Badge Move combo recall budget coverage into responses tests

These cases directly exercise src/server/responses/combo-session-recall.ts, but placing them in tests/oauth/state-store-sweeper.test.ts means the normal focused bun test tests/responses validation for Responses changes will not run the new size, eviction, and invalidation regressions. Keep the registration/sweeper integration assertion here if needed, but move the cache-behavior cases beside the existing combo-recall coverage under tests/responses/.

AGENTS.md reference: AGENTS.md:L376-L379

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lidge-jun added a commit that referenced this pull request Sep 16, 2026
The remembered model id is provider-reported and arrives on the response, so
nothing upstream of the recall store bounds its length. Lane keys are already
SHA-256 digests, which means the 256-lane cap bounded the number of entries but
not the bytes those entries held. A long-running process could accumulate
arbitrarily large remembered strings.

Bound retention on two more axes: 1 KiB per remembered model id and 64 KiB in
aggregate. The size test runs on code units before encoding, because a UTF-8
encoding is never smaller than its code-unit count, so the bound never pays the
allocation it exists to prevent. Aggregate eviction drops the least recently
written lane, which is the front of the map because every write re-inserts its
own lane at the back. A single entry is capped far below the aggregate budget, so
a write can never evict itself.

Every removal now goes through one helper that releases the entry's bytes, so the
counter cannot drift from the map through the read-time invalidation path, the
reconciliation path, or a lane rewrite.

An unretainable model id DECLINES the write rather than clearing the lane. That
is the ordering-sensitive part. This callback carries a config generation, not a
request order, so two accepted completions on one lane under the same generation
can arrive out of order; a clearing branch would let the older one erase the
newer selection. Declining matches how every other rejection in
rememberComboForLane already returns, and leaves the established contract intact:
an older response never overwrites or clears a newer one.

Register the store for periodic expiry as well. The TTL was previously evaluated
only on read or on a generation change, so a lane that is never read again held
its entry until the process exited.

Closes #4525

Co-authored-by: luvs01 <27862058+luvs01@users.noreply.github.com>
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github-actions Bot marked this pull request as draft September 16, 2026 03:22
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Landed via #4755 at 5e3029e

@lidge-jun lidge-jun added the landed-via-maintainer Original PR closed after landing via a maintainer merge train label Sep 16, 2026
@lidge-jun lidge-jun closed this Sep 16, 2026
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