Experimental: preserve parent prompt-cache prefixes for Desktop side chats - #4222
Experimental: preserve parent prompt-cache prefixes for Desktop side chats#4222nahuelb wants to merge 9 commits into
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Path: .coderabbit.yaml Review profile: ASSERTIVE Plan: Advanced Run ID: 📒 Files selected for processing (2)
Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughAdds the opt-in ChangesSide-chat cache reuse
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Sequence Diagram(s)sequenceDiagram
participant ResponsesHandler
participant OpenAIResponsesAdapter
participant SideChatCache
participant UpstreamResponses
participant PassthroughRecorder
ResponsesHandler->>OpenAIResponsesAdapter: build canonical OpenAI request
OpenAIResponsesAdapter->>SideChatCache: prepare side-chat cache
SideChatCache-->>OpenAIResponsesAdapter: apply body, header, and identity changes
OpenAIResponsesAdapter->>UpstreamResponses: send prepared request
UpstreamResponses-->>PassthroughRecorder: return terminal response
PassthroughRecorder->>SideChatCache: complete side-chat cache
SideChatCache->>SideChatCache: store completed snapshot
Merge Risk: 🟡 Moderate · up to The opt-in side-chat cache may reuse a parent session when inherited content extends beyond the completed parent snapshot, risking a mismatched prompt lineage. This should be resolved before merge or enablement. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 6.25% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 9 files. (1 skipped: 1 unsupported.)
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리뷰 · 우선순위 52 / 80이 PR은 Codex Desktop 사이드 채팅이 부모 대화의 프롬프트 캐시 접두를 실험적으로 재사용하게 하려는 옵트인입니다. 설정 키는 요지는 부모 요청이 남긴 지문 캐시를, 포크 메타·계정/크레덴셜·모델/툴 호환·상속 히스토리 검증 후에만 자식 사이드 채팅 접두로 쓰는 것입니다. 부모 reasoning을 자식에 넣지 않고, 사이드 경계 지시문과 src/codex/side-chat-cache.ts - 신규 중심 모듈. 계정/크레덴셜 스코프·만료·완료 후에만 시드되는지가 보안 리뷰의 핵심입니다. 프로세스 로컬이라도 계정 격리 실패는 치명적입니다. 메인테이너의 판단이 필요한 지점
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Inline comments:
In `@src/codex/side-chat-cache.ts`:
- Line 225: Update the candidate verification logic around prefixLength to
reject candidates when the first boundary index exceeds candidate.items.length,
preventing inherited history beyond the completed parent snapshot from reusing
the parent cache key or provider session. Preserve acceptance when the boundary
is within the stored snapshot, and add a regression test covering an exact
cached prefix followed by an extra developer or user item and
SIDE_CHAT_BOUNDARY.
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docs-site/src/content/docs/reference/configuration/providers.mdscripts/test-layout/layout.jsonsrc/adapters/openai-responses.tssrc/codex/exec-cache-reference.tssrc/codex/side-chat-cache.tssrc/config.tssrc/server/auth-cors.tssrc/server/responses/core.tssrc/types/provider.tstests/codex-integration/codex-side-chat-cache.test.tstests/fixtures/test-layout-expected.jsontests/responses/side-chat-cache-integration.test.ts
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Read the scope/account binding and request/terminal wiring at a8e694d. This remains explicitly opt-in, unlike the current #4225 default. The cache checks credential/account and settings, stores fingerprints rather than parent prompt bodies, and seeds reuse only from completed responses.
The remaining acceptance decision is semantic, not just whether the tools array contains the same names: this also moves recognized side-conversation instructions and selected functions.exec method reference text, reorders a compatible catalog, and reuses the parent's provider session/cache identity. Please provide an actual Desktop parent-to-side-chat fixture proving the side boundary, permissions and executable method references remain usable after rewriting, plus a meaningful before/after cache result. Include failed/unfinished parent, changed credential, parent miss, and incompatible-prefix controls; unknown formats must keep their documented fallback behavior.
I am not treating source-level prompt text relocation as capability enforcement, or a potential cache-key match as a measured cache benefit. Keep Draft and the sponsorship hold until the owner accepts this Desktop-specific rewrite contract and exact-head product/caller checks are available. No app session or local configuration was changed.
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Summary
Allow compatible Desktop side chats to reuse a completed parent's prompt-cache key and provider session identity through the existing opt-in
providers.openai.experimentalCodexSideChatCachesetting. Explicit fork metadata, serving credential/account, settings, tool definitions, and inherited prefixes must match. Child task and turn identifiers remain distinct, and recognized side rules retain developer authority at the boundary.Add
sideChatCachediagnostics to the existing usage log and attempt records: reuse decisions, verified item counts, preparation/normalization/hash/matching timing, snapshot completion outcomes, and bounded retention estimates. A hashed child-thread ID supports precise correlation when ordinary logs group descendants under a parent. Completion-sensitive requests publish these fields before terminal logging, preserving the inspector's reconstruction and first-terminal guards. Adopted combo requests use the final shared attempt's completed metrics.The read-only report separates feature decisions from reported cached tokens, counts attempts once, and distinguishes unbound from already-bound side requests. Missing or estimated usage remains unknown. Observation timestamps order retention samples when completions arrive out of order. Hashing overlaps matching time; retained bytes estimate payloads, not process heap usage.
Verification
Head
610dff94d246a525153e26972ab2cfbec5923dd9; merge base withdev:6101140ffc8853daac57b083b0112dd6ef80241f. Source/runtime changes remain separate from the Astra effort-cache PR.f7a628f07: 22,579 passed, 39 skipped, zero failures, using the verified test-only Bun1.4.3-canary.1+97c191b7cdirectly onscripts/test.ts.Reproduce the local synthetic measurements:
Trial at
f7a628f07on macOS arm64 / Bun 1.4.2 trial, four clients, HTTP/SSE upstream and mixed HTTP/WebSocket ingress:All 160 side requests in each enabled proxy cell reported verified prefix reuse; all 161 parent/side snapshots were stored. The harness also measures 4/128/1,024 inherited items and reordered catalogs with 16/128/256 tools.
report.jsonand rawsamples.jsonlrecord source/runtime identity and observed transports. Synthetic token counts are fixture data, not evidence of upstream cache savings. These measurements show local costs; actual Desktop acceptance, cache savings, and Windows execution still need separate evidence.Bun 1.4.2's broad test-isolation crash reproduces on clean upstream code. The canary test runner avoids it without changing the bundled runtime/dependency pin, dropping tests, or retrying failures into passes. Default pinned-runtime prepush is not claimed green. Hosted CI and maintainer sponsorship/readiness remain separate from local validation.
The new metadata is allowlisted: fixed reasons, numeric measurements, and hashed child identity. It adds no prompt text, executable tool descriptions, credentials, or raw account identifiers to diagnostics. Security/state-isolation review remains a maintainer responsibility before merge.
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