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 6 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
Codex Desktop side chats can resend a large inherited prompt under a fresh cache/session identity. This experimental opt-in preserves a verified parent prefix so a newly opened side chat can reuse the parent's upstream prompt cache.
Enable
providers.openai.experimentalCodexSideChatCache: trueon the canonical ChatGPT forward provider and restart. It is disabled by default. Completed requests seed a bounded, process-local fingerprint cache; matching requires explicit fork metadata, selected credential/account identity, compatible model/settings/tools, and verified inherited history.The implementation preserves child task/turn ownership and continuation state. It moves exact recognized side-conversation instructions to the side boundary, retains the child's current methods when separating context-dependent
functions.execreference sections, and never substitutes the parent's reasoning or child suffix. Unknown formats and incompatible history skip parent reuse. Documentation describes the option and limitations.This is an independent side-chat patch, ported onto current
dev; it does not include the separate reasoning-effort cache experiment or local installation tooling.Draft review requested: maintainer security review of provider-session reuse and account isolation, instruction placement, and the narrow Desktop tool-reference normalization. The first differing reasoning item may terminate a proven reusable prefix only when an explicit side boundary and preceding conversation history exist. Desktop prompt-format changes, credential refresh, nested forks, and upstream cache retention can prevent hits. This is not ready for default enablement.
The Desktop port check exposed a transport-only mismatch: the parent sent
stream_options.reasoning_summary_delivery: "sequential_cutoff", while the side chat had no stream-option fields. Cache comparison now excludes recognized reasoning-summary delivery values and boolean stream-obfuscation settings. Each request keeps its own wire options; unknown or malformed stream options remain part of the equality check. Generation settings, credentials, tools, and inherited history still require compatibility.Verification
Management-validation follow-up
a8e694d4b: 160 focused management and side-chat tests passed; typecheck, privacy scan and diff checks passed. Canonical seed checks now accept the validated boolean cache setting, and PATCH supports toggling and clearing it. The broader affected-test run aborted on a Bun 1.4.2 worker SIGSEGV intests/providers/command-code-workspace-cache.test.ts; this is not counted as a passing run. The implicated provider test passes all 4 cases when run alone.Fresh Desktop validation on the 2.51.0 port after this fix: warm parent 37,637 input / 34,560 cached tokens; newly created side chat 38,603 input / 36,608 cached tokens (94.8%) on its first request. The decision was
inherited-with-developer-boundary, with 95 matched input items. Both requests used Luna at low effort. The test request completed successfully. Earlier repeated side requests could have their own cache hits while parent inheritance was still refused, so those hits are excluded from this evidence.Live evidence from the local 2.46.0 prototype, not a deployment of this 2.51.0 port: a warmed parent reported 30,872 input / 29,440 cached tokens. A newly created Desktop side chat's first request reported 31,782 input / 29,440 cached tokens (92.6%), with 78 matched input items. It replied exactly
SIDE_CHAT_CACHE_TESTand made zero tool calls. Cache hits remain opportunistic.Port validation with pinned Bun 1.4.2:
bun run typecheckpassed.bun test tests/codex-integration/codex-side-chat-cache.test.tspassed: 45 tests, including config validation, exact boundaries, account/credential changes, siblings, reasoning suffixes, unsupported inputs, duplicate tool names, completed-only state, expiry, retries, disabled behavior, and stale completions after re-enabling.cc871a876.bun run privacy:scanandgit diff --checkpassed.cc871a876as well as the patch:bun test --isolate --parallel=4 tests/providerscrashed in both trees. The baseline crashed inmuse-spark-web-search-compat.test.ts; the patched tree crashed incommand-code-workspace-cache.test.ts. This isolates the failure from the side-chat implementation, although the Bun defect itself is not fixed here. With the already-installed Bun 1.4.0 runtime, the same patched provider suite passed: 3,721 tests, one skip, zero failures. No dependency pin or test exclusions were changed.bun scripts/test.tsran all parallel and prescribed serial groups: 22,562 passed, 40 skipped, zero failed. Pinned Bun 1.4.2 type checking, privacy scan, test-layout guards, and the new handler integration file also passed. The ordinary 1.4.2 parallel runner still exhibits the upstream crash on this Mac; the pinned-runtime CI-style batch run below now passes.inherited-with-developer-boundary. All five responses matchedSIDE_CHAT_CACHE_TESTand made zero tool calls. This was a synthetic HTTP fork probe. The fresh Desktop result above separately validates the port; the 2.46.0 Desktop result remains historical prototype evidence.Review-readiness follow-up:
devcommit6101140ffc8853daac57b083b0112dd6ef80241f. The merge adds upstream devlog documents only; the reviewed runtime, tests, and public docs are unchanged.review-agentsubagent reviewed all 12 changed files at872738652169838bb626977447f5a3b6aea83543: No findings. It checked account isolation, instruction normalization, completion handling, rebuilds, and stream-options comparison. Pooled-account recovery lacks dedicated end-to-end coverage in the new handler tests. This is not maintainer security sign-off.mapfileenumeration with equivalent NUL-delimited Bash 3 reading on this Mac. No dependency pins, repository test exclusions, or retry policies changed.567c8f7d9added explicit developer/user suffix regression tests and documentation. CodeRabbit verified the contract, withdrew the finding, and resolved the thread. No runtime change was needed. The updated feature/handler suite passed 52 tests on pinned Bun 1.4.2; typecheck, privacy scan, and the 425-page docs build passed again. The previously validated runtime and other tests remain unchanged.Checklist
Author checks cover credential-scoped fingerprints, detached request copies, default-off behavior, bounded retention, and diagnostic redaction. Independent maintainer security review is still required. The repository hygiene gate reports
unsponsored_surfacefor the provider-field visibility entry insrc/server/auth-cors.ts; a maintainer must review it and applymaintainer-sponsored. Fork CI is also waiting for maintainer workflow approval. Both maintainers were asked to review/sponsor the security surface and approve those workflows in this request. The final ready-for-review confirmation remains unchecked until that external gate is resolved.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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