fix(responses): keep compaction blobs on the backend that minted them - #2228
fix(responses): keep compaction blobs on the backend that minted them#2228olddonkey wants to merge 2 commits into
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A replayed compaction item carries an `encrypted_content` blob only its minting backend can decode, and Codex replays it on every later turn. Two paths modified or misrouted it, and because the item outlives the failure in the client transcript, both wedged the session until its history was cleared — the routed compaction turn the proxy itself drives replays the same item. Relay: `scrubOcxCompactionItems` treated every non-`ocx1:` blob as OpenAI's and forwarded it verbatim, with no check that the destination was the issuer. A session that compacted on a canonical route and then switched to a routed provider sent that blob to an upstream that could only answer "Could not decode the compaction blob". Native blobs now travel only to destinations that mint them — forward-auth routes, which relay the caller's own OpenAI credentials to the ChatGPT backend or a relay in front of it, and the official OpenAI API under key auth — and degrade elsewhere to the same opaque note the bridged parser uses. Backfill: the response-side exemption list named `compaction` alone, so `compaction_summary` and `context_compaction` received synthesized ids that the client stored and replayed as "modified from the compact response". That divergence was possible because the compact wire family was enumerated in three places; it is now one predicate in `src/responses/compaction.ts`. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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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: Pro Plus Run ID: 📒 Files selected for processing (6)
Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughCompaction handling now recognizes three wire item types through a shared guard. Replay preserves native blobs only for compatible destinations, converts unsupported blobs to user messages, and prevents ID backfilling for all compact-wire items. ChangesCompaction replay
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The PR narrows compaction-blob forwarding to destinations that can decode the payload and preserves compacted history elsewhere; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Request as Incoming response request
participant Adapter as openai-responses adapter
participant Capability as destinationDecodesNativeCompactionBlob
participant Backend as Routed destination
Request->>Adapter: Submit compaction item
Adapter->>Capability: Check native blob capability
Capability-->>Adapter: Return destination capability
alt Destination supports native blobs
Adapter->>Backend: Forward native compaction blob
else Destination does not support native blobs
Adapter->>Backend: Send opaque user message
end
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Actionable comments posted: 1
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Inline comments:
In `@structure/04_transports-and-sidecars.md`:
- Around line 80-82: Update the compact-wire documentation to state that
response-side ID backfill is bypassed, while store: false still strips IDs from
compact-wire items. Preserve the existing explanation that their IDs are not
stored-item references and that editing them is rejected by the minting backend.
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src/adapters/openai-responses.tssrc/providers/openai-tiers.tssrc/responses/compaction.tssrc/responses/parser.tssrc/server/responses/responses-field-backfill.tsstructure/04_transports-and-sidecars.mdtests/openai-responses-passthrough.test.tstests/responses-field-backfill.test.ts
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리뷰 · 우선순위 70 / 80지금 응답 레그는 더 좁음. 이 PR이 두 구멍을 같이 막음. 테스트가 라우티드 xAI 베이스에서 blob이 안 새는지, OpenAI 키/포워드 릴레이는 통과하는지, ocx1 로워링, bare marker 유지, 백필 byte-for-byte를 잠금. 방향 맞음. 주의. #2229랑 원인 다름. 저건 reasoning draft고 체크리스트 0/4. hygiene 통과. 세션 웻지라 점수는 높음. 2.28 블로커는 아님. 지금 HEAD 해결방안: CI 그린이면 draft 해제하고 이 댓글은 grok-bot이 작성했습니다 |
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Part of #2240 — compaction blob provenance — a blob relayed to a backend that could not have minted it. That issue tracks the whole 2.28.0 Grok regression; this PR is one layer of it, so it deliberately does not carry a closing keyword. The failures are sequential — each one is only reachable once the previous is fixed — so the issue should stay open until every linked PR lands. |
…rd auth Review found the discriminator unsound, and it was. `authMode === "forward"` describes local credential handling, not which backend answers: the adapter forwards caller credentials only to the canonical ChatGPT Codex surface, so a noncanonical forward provider receives none and may point anywhere. That produced both errors at once. A self-hosted or xAI-backed forward gateway was classified as able to decode a foreign blob, was sent it unchanged, and stayed wedged — the exact failure this branch exists to fix. Meanwhile a key-auth relay genuinely fronting OpenAI was classified as unable to decode and needlessly lost its compacted context. Relay is now positive only for the canonical surface, the exact official OpenAI API, or a destination whose operator opts in with the new `decodesNativeCompactionBlobs` provider flag. Verified that the flag survives config derivation and reaches the predicate, since the unit tests construct provider literals and would not have caught it being dropped there. Also corrects a stale line in the transport notes: compact-wire items are not exempt from the `store: false` item-id strip. That exemption was deliberately reverted to match codex-rs (`core/src/client.rs:918-925`). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Maintainer status on exact head add8a55: the backend-provenance fix remains valuable, but this draft is not ready to merge. The readiness checklist is 0/4, the branch is 24 commits behind dev, and the documentation accuracy thread about response-side ID backfill versus store:false stripping is still unresolved. Please address that thread, synchronize with current dev, and complete exact-head CI before requesting final review. Keep #2240 open; this is one sequential layer, not the closing PR. |
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Superseded by #2254, which carries this change plus the rest of the series as a single review target. These eight PRs had to merge in a strict order, and the later four each carried the whole series as their diff (up to 27 files / +2830), so reviewing them in isolation was not actually possible. #2254 has the same 16 commits with each unit's evidence intact in its message, and the combined test gate. Nothing is dropped — the branch is unchanged and still pushed, so this can be reopened if a split is preferred after all. |
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Summary
A replayed compaction item carries an
encrypted_contentblob only its minting backend can decode, and Codex replays it ininputon every later turn. Two paths modified or misrouted it. Both wedge the session rather than failing one turn: the item outlives the failure in the client transcript, and the routed compaction turn opencodex itself drives replays the same item, so the user cannot compact their way out — only clearing history recovers.Relay provenance.
scrubOcxCompactionItemstreated every non-ocx1:blob as OpenAI's and forwarded it verbatim, with no check that the destination was the issuer. A session that compacted on a canonical route and then switched to a routed provider sent that blob to an upstream that could only answerCould not decode the compaction blob. Ensure it is unmodified from the compact response.Native blobs now travel only to destinations that mint them, and degrade elsewhere to the same opaque note the bridged parser already uses for this case.The destination test is
destinationDecodesNativeCompactionBlob: forward-auth routes (which relay the caller's own OpenAI credentials to the ChatGPT backend or a self-hosted relay in front of one) plus the official OpenAI API under key auth. Everything else is a routed provider carrying its own credentials to a non-OpenAI backend, which can only reject a blob it never issued. Degrading is deliberately the conservative direction — a self-hosted relay keeps its users' compacted history, and only a destination we are sure cannot decode loses it.Backfill exemption. The response-side exemption list named
compactionalone, socompaction_summaryandcontext_compactionreceived synthesized ids (item_ocx_1, …) that the client stored and replayed — literally "modified from the compact response", with no route change needed. That divergence was possible because the compact wire family was enumerated in three places; it is now one predicate insrc/responses/compaction.ts, and the parser's copy was folded into it.Scope
stripItemIdsWhenUnstoreddeliberately still strips ids from compaction items. An earlier draft exempted them, but codex-rs strips ids from every item understore: false(core/src/client.rs:918-925) and OpenAI accepts that, so stripping is the contract rather than a corruption; after the backfill fix there is also no known source of an id on those items. Diverging from the reference client without evidence would have added risk for no gain.The sibling
Could not decrypt the provided encrypted_contentfailure is not addressed here. It has a different root cause (the reasoning item is reshaped on the response leg) and needs a live canary to confirm, so it is a separate PR.Verification
src/fails 2 of the new tests (every compact wire item type is returned byte-for-byte,degrades a foreign blob to a note on a destination that cannot decode it). The other new cases are regression guards that pass before and after —ocx1:lowering, barecontext_compactionmarkers, and native relay to minting destinations.bun teston the 39 compaction/responses/adapter/parser suites — 631 pass, 0 fail.bun run typecheck— clean.bun run privacy:scan— passed.Checklist
structure/04_transports-and-sidecars.mdrecords the provenance boundary and a Decision Log.)🤖 Generated with Claude Code
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Gate
bun run test— 13738 pass, 10 skip, 1 fail across 866 files, onabc2b9f4f.The single failure is
tests/key-login-live-update.test.ts> "notify after key login pushes the merged row and keeps modelCosts on live and disk". It is pre-existing and unrelated: it reproduces byte-identically on every branch in this series, including ones that never touch CLI code, and on the integrated branch. Every gate in this series lands on exactly that one failure.(Plain
bun testwith no arguments hangs on this tree with high CPU and no progress — usebun run test.)