fix(responses): make apply_patch work on routed Responses destinations

[olddonkey]

Two commits fixing one user-visible failure: apply_patch breaks Codex on any routed Responses destination that does not accept native custom tools, and the compact turn fails outright.

Reported and reproduced against live xAI Grok on the native Responses lane:

422 Failed to deserialize the JSON body into the target type:
    input[5]: invalid "custom_tool_call" item: missing field `id`

The error message is misleading — the id is present

Instrumenting the adapter showed the item leaving as

{"type":"custom_tool_call","id":"ctc_abc123","call_id":"c1","name":"apply_patch","input":"noop"}

xAI reports the first field its own parser cannot satisfy, not the real problem, which is that it does not accept the item type at all. This is the same habit as its "Could not decode the compaction blob" message for a reasoning field. Do not fix this by generating or preserving ids — that reading costs hours and lands nothing.

1. apply_patch was exempt from lowering unconditionally

ROUTED_CUSTOM_TOOL_PASSTHROUGH exempted it, so it reached every routed destination as a type: "custom" tool with custom_tool_call items.

Decisive A/B against the live endpoint — identical body, identical id, only the tool name differs:

tool name	outcome
apply_patch (exempt)	422
my_custom_thing (lowered to a function)	200

Lowering is what makes it work; the exemption is what breaks it.

The exemption is not wrong everywhere — the canonical ChatGPT surface speaks custom_tool_call natively and lowering there would regress it. The defect is that one unconditional rule about "routed providers" encoded a claim about a single destination's capability. Adds supportsResponsesCustomTools, following the existing supportsOpenAiWebSearchToolFields shape: declared on the registry row and the provider config, filled only when unset, consumed as an explicit denial. Absent or true keeps today's behaviour byte-identical; only xAI declares false.

The response path needed no special case: it is name-generic, so once apply_patch joins the converted set the existing repair restores the function_call and its streaming argument events to a custom_tool_call with the original call id.

2. The compaction body was built before the transforms that depend on it

With (1) in place the normal turn worked and compact still failed. Every routed lowering step derives its plan from the tool declarations, and buildRoutedCompactionBody deletes them — and it ran first:

if (_compactionRequest && !canonical) outBody = buildRoutedCompactionBody(outBody);  // tools deleted
if (!canonical) outBody = promoteClientLoadedTools(outBody);
if (!canonical) rewriteRoutedCustomToolsForUpstream(outBody, ...)                    // plan is empty
// tool-search lowering, namespace lowering, canonical-only field stripping follow

So on a compaction turn every lowering plan is empty and replayed call items go to the wire in their private shapes. Measured:

case	outbound
tools present, normal turn	tool lowered, call item converted
tools absent	custom_tool_call raw
_compactionRequest: true	custom_tool_call raw

This is the second time this exact shape has been fixed here. A replayed namespace key survived for the same reason, and that fix taught one lowering step to cope with an empty plan. It recurred as soon as a different private field went through the same path. This one moves the compaction body build to last and states the invariant at the call site: it removes the tool surface, so anything before it may depend on the declarations and anything after it cannot. The next private field then needs no workaround of its own.

Two effects beyond the call items, both improvements found while verifying the reorder:

• promoteClientLoadedTools could previously reintroduce top-level tools after compaction had removed them; running compaction last prevents it.
• Namespace-collision validation now runs before the declarations are deleted.

Non-compaction output is byte-identical, pinned by an exact-comparison test.

Verification

Live, through a locally deployed build against xAI Grok:

scenario	before	after
normal turn replaying apply_patch history	422	200
compaction turn replaying apply_patch history	422	200
unrelated custom tool	200	200

Also confirmed in real use: the reporter's Codex compact now completes, and the 422 storm in their session stops at the deploy timestamp.

Measured side effect: the upstream prompt cache stops breaking

Each 422 forces the client to retry, and the rebuilt request's prefix no longer matches what the upstream cached — so every rejection also throws away the prompt cache for that conversation. Fixing the rejections fixes that too.

Observed on the reporter's live xAI sessions, comparing the hours before and after this branch was deployed locally. "Prefix broke" means the turn reported less than half its input as cached:

turn index in conversation	before	after
2–5	44% broke (n=62)	38% broke (n=8)
6–15	28% broke (n=106)	5% broke (n=19)
16+	23% broke (n=170)	5% broke (n=55)

Aggregate cached-input share over the same windows: 85.0% → 96.3%.

Bucketing by turn index controls for the obvious confound — early turns break more in both eras, because the transcript is still churning, and that bucket did not improve. The improvement appears only in the mature buckets, which is what a real effect looks like; a maturity artifact would have moved all three.

This is observational (one user's live sessions, not a controlled experiment), so treat the exact percentages as indicative. The direction and the mechanism are solid: fewer upstream rejections means fewer client rebuilds, and a stable prefix is what the upstream cache needs.

Two hypotheses were tested and refuted along the way, worth recording so nobody re-runs them: the outbound tool catalog is byte-stable across turns (instrumented — 15 consecutive turns, identical hash and instructions length, zero changes), and it is not cache TTL (a 443-second gap still hit 99%).

Follow-up measurement on the 2.29.0 base (2026-08-21)

The reporter re-based the local deployment on the released v2.29.0 plus this branch's five commits and #2313, and kept using it. Same data source (~/.opencodex/usage.jsonl, provider xai), one fixed definition throughout: prefix break = a 200 turn, not the first of its conversation, whose cachedInputTokens is below half of the previous turn's inputTokens; extra sends = sendCount beyond one per request (the proxy re-sending after an upstream rejection).

window (PDT)	what was running	requests	cached-input share	prefix breaks (mature turns)	extra sends	upstream errors
08-20 10:00–23:00	2.28.0 + partial fixes	386	85.3%	18/268 (6.7%)	68	56
08-20 23:00 – 08-21 08:07	dev + #2264/#2267/#2270	418	92.7%	26/380 (6.8%)	9	30 (all before 23:10)
08-21 11:43–12:25	v2.29.0 + #2270 + #2313	124	95.8%	6/119 (5.0%)	0	1 (a 499 from the proxy restart itself)

The main session in the last window (115 turns, 17.4M input tokens) sat at 96.0% overall and 98.0–99.8% per turn over its last 30 turns (median 99.6%); of 17.4M input tokens, 0.7M were genuinely new.

Two things this table states more precisely than the one above:

• The cost that went away is the rejection/re-send cost — 68 extra sends and 56 upstream errors in the first window, 0 and 0 now — together with the cached-input share it had been destroying (85% → 96%).
• Under this stricter break definition the residual rate is ~5–7% in every window. Those residual breaks are sequential turns in one thread (sendCount=1, no error, input grown by a few hundred tokens) that the upstream reports as fully uncached, with the longer first-token latency of a cold prefill. They are not interleaved threads (checked against Codex's own rollout token_count sequence) and not proxy-side prefix rewrites (earlier inbound/outbound hash instrumentation, 158 turns, zero cases). That is where the remaining ~4% of non-cached input lives, and it is upstream behaviour.

Tests

Rebased onto current dev (c0cbe494e) and addressed the follow-up CodeRabbit docs comment. Exact head 89c7e9623. 0 behind / 5 ahead.

• Focused suites: 138 pass / 0 fail on 9339350ce (custom-tool-compat, namespace-tool-compat, openai-responses-passthrough, responses-custom-tool-repair), including the data: [DONE] pin and the noncanonical-forward apply_patch path. The follow-up commit only changes structure/04_transports-and-sidecars.md.
• bun run typecheck and bun run privacy:scan pass on 9339350ce.
• The adapter still uses !isCanonicalOpenAiForwardProvider(provider) rather than authMode, and xAI remains an explicit supportsResponsesCustomTools: false denial.
• Docs now state that native apply_patch stays a custom tool unless the destination explicitly denies custom tools.
• GitHub Cross-platform CI on this SHA still needs maintainer approval for the fork workflows.

Previous bun run test on the pre-refresh series is not reused as a pass for this SHA.

Merge order

Touches the same custom-tool gate as #2264 and the same stripCanonicalOnlyToolFields call as #2267, so expect a small conflict with either. This branch is based on plain dev and stands alone; merging it after those two needs the gate to read !isCanonicalOpenAiForwardProvider(provider) and the strip call to keep its provider argument.

Part of #2240.

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Summary by CodeRabbit

• New Features

  • Added provider capability handling for native Responses custom tools.
  • Added compatibility routing for providers that do not support native custom tools, including apply_patch.
  • Improved compaction handling for custom, tool-search, and namespaced calls.
  • Preserved replayed namespace information when tool catalogs change or are unavailable.

• Bug Fixes

  • Fixed streamed custom-tool requests and responses for incompatible providers.
  • Ensured compaction transformations occur consistently after other request rewrites.

• Documentation

  • Clarified Responses passthrough and custom-tool compatibility behavior.

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📝 Walkthrough

Walkthrough

The change adds provider-level Responses custom-tool capability resolution, applies capability-aware routed rewriting, moves compaction construction to the end of the transformation pipeline, and adds coverage for compaction, namespace replay, and streamed tool restoration.

Changes

Responses custom-tool compatibility

Layer / File(s)	Summary
Capability declaration and resolution src/types/provider.ts, src/providers/registry.ts, src/providers/derive.ts, src/router.ts, tests/openai-responses-passthrough.test.ts	supportsResponsesCustomTools is added to provider configuration and registry entries. xAI sets the capability to false. Registry enrichment applies the value only when configuration does not define it.
Capability-aware routed transformation src/responses/custom-tool-compat.ts, src/adapters/openai-responses.ts, src/responses/namespace-tool-compat.ts, structure/04-transports-and-sidecars.md	Routed custom-tool conversion now depends on upstream capability. Compaction-body construction runs after routed rewrites and canonical-field stripping. Namespace replay rewriting remains active without a tool catalog.
Compatibility and replay validation tests/custom-tool-compat.test.ts, tests/namespace-tool-compat.test.ts, tests/openai-responses-passthrough.test.ts, tests/responses-custom-tool-repair.test.ts	Tests cover native and lowered apply_patch, other custom tools, compaction lowering, namespace aliases, unchanged non-compaction requests, and streamed restoration of function-call events.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to aedfb

The change is localized to routed tool compatibility and compaction ordering, with focused validation covering the affected paths; no actionable merge-blocking risk remains after normal checks and review.

Possibly related PRs

• lidge-jun/opencodex#2040: Both changes modify routed Responses tool compatibility and transformation behavior.

Suggested reviewers: lidge-jun, ingwannu

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant routeModel
  participant OpenAIResponses
  participant CustomToolCompat
  participant Upstream
  Client->>routeModel: Submit Responses request
  routeModel->>OpenAIResponses: Provide resolved capability
  OpenAIResponses->>CustomToolCompat: Rewrite routed custom tools
  CustomToolCompat-->>OpenAIResponses: Return transformed request items
  OpenAIResponses->>OpenAIResponses: Build final compaction body
  OpenAIResponses->>Upstream: Send transformed request
  Upstream-->>OpenAIResponses: Stream function-call events
  OpenAIResponses-->>Client: Restore client-facing custom-tool events

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 15.38% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 11 files. (1 skipped: 1 unsupported.)	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 main fix: enabling apply_patch on routed Responses destinations.

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Review readiness checklist

• ✅ All CI tests are green on my local testing.
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In `@tests/responses-custom-tool-repair.test.ts`:
- Around line 617-623: Add an assertion after reading clientSse in the affected
test to verify the terminal SSE marker data: [DONE]. Keep the existing
restored-event assertions unchanged and ensure the test fails when the terminal
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[Ingwannu]

Reviewed exact head e997249. The xAI OAuth/Responses direction is valid, and 135 focused tests plus typecheck pass, but the new capability is not enforced at every routed destination.

The adapter still calls rewriteRoutedCustomToolsForUpstream only when authMode is not forward. A noncanonical forward provider with supportsResponsesCustomTools: false therefore sends apply_patch unchanged as type custom/custom_tool_call and reports an empty converted set. I reproduced that exact serialized output on this head. Forward auth is not an OpenAI-destination identity; use the existing !isCanonicalOpenAiForwardProvider(provider) boundary here and add a regression for a noncanonical forward provider that explicitly denies custom tools.

The CodeRabbit request to assert data: [DONE] in the new apply_patch SSE restoration test is also correct test hardening. The adjacent exec case already pins the trailer, but this new end-to-end path should prove that restoration does not lose the terminal marker.

After those two points, rebase the branch onto current dev (now one commit ahead from #2265), complete the readiness checklist, and rerun exact-head CI. The capability and compaction-order changes remain a strong merge candidate for #2240.

[Ingwannu]

Re-reviewed exact head cbe9e6be3e6ae6f0ad46befc3d6c319ba4735307. The new commit correctly adds the missing data: [DONE] assertion, but it does not fix the remaining runtime blocker from my previous review.

src/adapters/openai-responses.ts still calls rewriteRoutedCustomToolsForUpstream only under provider.authMode !== "forward". A noncanonical forward-auth Responses provider with supportsResponsesCustomTools: false therefore still forwards apply_patch as custom instead of lowering it. Authentication transport is not destination identity.

Current dev now contains the corrected !isCanonicalOpenAiForwardProvider(provider) boundary via #2273. Please rebase this branch onto current dev, preserve that boundary, and add/retain an explicit noncanonical-forward regression proving apply_patch is lowered and restored when custom tools are denied. Then complete the readiness checklist and rerun exact-head CI.

[lidge-jun]

리뷰 · 우선순위 71 / 80

재현이 지금 dev HEAD 7881319e7에서 그대로임. src/responses/custom-tool-compat.ts:4 ROUTED_CUSTOM_TOOL_PASSTHROUGH = new Set(["apply_patch"]). rewriteRoutedCustomToolsForUpstream(:187-197)가 능력 인자 없이 그 이름을 무조건 면제함. 라우티드 xAI Responses로 type: "custom" + custom_tool_call이 감. 업스트림은 422 ... invalid "custom_tool_call" item: missing field id를 냄. id는 있음. 파서가 아이템 타입 자체를 거절하고 첫 필드만 욕하는 거임. id를 만들거나 보존해서 고치지 말 것. 본문이 그거 이미 경고함. A/B도 맞음. 같은 바디에서 이름만 my_custom_thing이면 낮춰져서 200, apply_patch만 422.

#2258/#2273/#2283가 착지한 뒤에도 이 면제는 안 건드림. #2283가 방금 src/router.ts:358-368 routedProviderConfig()에 supportsOpenAiWebSearchToolFields 백필을 넣음. 핸드빌드 프로바이더가 레지스트리 스칼라를 놓치던 구멍임. src/providers/registry.ts:1013 xAI는 그 플래그만 false임. supportsResponsesCustomTools는 src/types/provider.ts에도 레지스트리에도 없음. 이 PR이 같은 셰이프로 커스텀 툴 거부를 넣음. 없거나 true면 오늘이랑 바이트 동일. xAI만 false. #2283 패턴을 커스텀 툴에 복사하는 거임. 방향 맞음.

둘째 구멍도 현재 dev에 있음. src/adapters/openai-responses.ts:1698-1707이 _compactionRequest면 buildRoutedCompactionBody(:1541-1557)를 먼저 돌려서 tools를 지움. 그 다음에야 rewriteRoutedCustomToolsForUpstream이 돔. 플랜이 비어서 리플레이된 custom_tool_call이 와이어로 그대로 감. 네임스페이스 키도 예전에 같은 순서로 살았음. 그때는 빈 플랜을 한 레이어만 고쳤음. 이 PR은 컴팩션 바디 빌드를 마지막으로 옮김. 선언에 의존하는 로워링이 먼저, 툴 표면을 지우는 게 마지막. promoteClientLoadedTools가 컴팩션 뒤에 툴을 다시 넣던 것도 같이 막힘. 네임스페이스 충돌 검증이 삭제 전에 돔.

#2264/#2267은 닫힘. #2273가 #2264 리베이스로 착지함. 이 브랜치는 예전 dev 기준이라 게이트가 !isCanonicalOpenAiForwardProvider(provider)를 읽어야 하고 strip 호출이 프로바이더 인자를 유지해야 함. 지금 헤드 398b7ade4를 현재 7881319e7에 리베이스해야 함. draft. 체크리스트 0/4. 라이브 xAI에서 일반 턴/컴팩트 422→200을 봄. 프롬프트 캐시 깨짐도 관측으로 줄었음. 테스트가 거부 능력 로워링/복원, absent/true 바이트 동일, 컴팩션 턴 로워링, 툴 표면 제거를 잠금.

#2188 사이드카 이미 dev. x_search 넣지 말 것. Grok OAuth Chat 기본(#2255)은 Chat 와이어가 이미 커스텀을 함수로 낮춤. 이건 Responses 레인임. GUI 옵트인 Responses(#2266)가 켜지면 이 422가 더 보임. #2240 시리즈. 프리뷰 배포 아님. 2.28 태그 블로커는 아닌데 라우티드 Grok 에이전틱 턴이 죽음. 그래서 71. 스플릿이 custom-tool-compat.ts나 types/provider.ts 능력 필드를 다시 옮기면 리베이스하지 말고 닫고 다시 짜라. 지금은 필드 추가 + 어댑터 순서라 그 정도 아님.

해결방안: 닫지 말고 열어 둬라. 현재 dev에 리베이스. 능력은 명시 거부만. 캐논 OpenAI는 패스스루 유지. 컴팩션은 로워링 다음. id를 발명하지 말 것. 체크리스트 채우고 draft 해제. #2240이 계약, 이건 구현. 랜덤 중복으로 닫지 말 것.

이 댓글은 grok-bot이 작성했습니다

[Ingwannu]

Re-reviewed exact head 398b7ad.

The two prior runtime blockers are resolved on this head. The adapter now uses the canonical-destination boundary rather than authMode to decide routed custom-tool lowering, and the focused coverage includes the noncanonical forward-auth apply_patch path plus the terminal SSE marker. I independently ran the changed focused suites (138/138), repository typecheck, and privacy scan successfully. React Doctor and all completed Linux test shards are green.

I am not approving a Draft. The PR readiness checklist is still 0/4, and exact-head Cross-platform CI is not finished yet. Complete the checklist, let the remaining CI finish green, and mark the PR ready; if the head remains unchanged, I do not see a remaining technical blocker in this scoped fix.

[olddonkey]

Rebased onto current dev (c0cbe494e) at exact head 9339350ce (0 behind / 4 ahead).

The two prior runtime comments remain addressed on this head:

• routed custom-tool lowering uses !isCanonicalOpenAiForwardProvider(provider), with a noncanonical-forward apply_patch regression
• the apply_patch SSE restoration test asserts data: [DONE]

Focused suites 138/138, bun run typecheck, and bun run privacy:scan pass on this SHA. Readiness checklist completed.

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Inline comments:
In `@structure/04_transports-and-sidecars.md`:
- Line 30: Update the native apply_patch wire-description sentence to state that
native custom_tool_call items are retained when supportsResponsesCustomTools is
absent or true, and converted to upstream function_call form only when the
capability is explicitly false.

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[Ingwannu]

Approved exact head 89c7e9623630467773f45e810191c55ac0121267.

The prior blockers remain resolved: routed custom-tool lowering uses destination identity rather than authMode, the noncanonical-forward apply_patch regression is covered, terminal [DONE] is preserved, and compaction construction occurs after the declaration-dependent rewrites. Focused validation, typecheck, privacy scan, React Doctor, and the exact-head cross-platform workflow are green.

This is a scoped TypeScript Responses compatibility fix with no current Go-runtime counterpart. Integration still needs to follow the repository transition policy; approval here is not a direct-push or release authorization.

[Ingwannu]

Merge hold after final exact-state check: current head 89c7e9623630467773f45e810191c55ac0121267 is still technically approved with no unresolved threads or failed checks, but dev has advanced 8 commits to 401c24f747ad011bf340ee0ae6522b353c5dfb71 since the tested base. Please rebase/merge the latest dev, rerun exact-head CI, and request the final merge check. This scoped TypeScript Responses fix has no current Go-runtime counterpart, which should be recorded when integrating.

[olddonkey]

Rebased onto current dev (401c24f74) at exact head a8efed54a (0 behind / 5 ahead). No conflict with #2306.

The reviewed contract is unchanged: routed custom-tool lowering still uses destination identity rather than authMode, the noncanonical-forward apply_patch regression remains, and terminal [DONE] is still asserted.

Focused suites 138/138, bun run typecheck, and bun run privacy:scan pass on this SHA. Please do the final merge check when exact-head CI is green.

[Ingwannu]

Approved exact head a8efed54acb5d2cc412b9c959214844d48d00eb0 after the current-dev rebase (0 behind / 5 ahead).

I independently revalidated the destination capability boundary, noncanonical forward path, compaction ordering, restoration identity, terminal marker, and the corrected architecture wording. Focused exact-head validation passed 138/138, with typecheck, privacy scan, and no unresolved review threads.

This supersedes my stale-head approval. I am applying maintainer-sponsored so the required cross-platform workflow runs on this exact SHA. Do not merge until that workflow is fully green and the head remains unchanged.

Integration note: this is a scoped TypeScript Responses compatibility fix with no current Go-runtime counterpart; record that explicit no-counterpart decision when merging under the dev2-go transition policy.

[Ingwannu]

Current integration hold: dev has advanced to 8535f082fac3f0342e2e73445edd4655be3147eb, so exact head a8efed54acb5d2cc412b9c959214844d48d00eb0 is now 14 commits behind despite its previously green CI and approval. Please rebase onto the current dev tip and rerun exact-head CI. The reviewed scoped contract still looks valid, but the stale head must not be merged.

[olddonkey]

Rebased onto current dev (8535f082f, the #2072 merge) at exact head f7dde028e (0 behind / 5 ahead).

No conflicts. The reviewed destination-capability boundary, noncanonical-forward apply_patch path, compaction ordering, and architecture wording are unchanged. Focused suites 138/138, bun run typecheck, and bun run privacy:scan pass on this SHA.

[Ingwannu]

Approved exact head aedfbf0 after the maintainer update to current dev. Independent exact-head validation passed 138 focused custom-tool/namespace/Responses repair tests, typecheck, privacy scan, diff check, React Doctor, and the full cross-platform CI including macOS. There are no unresolved review threads. The reviewed behavior remains narrowly scoped: explicit destination capability denial lowers apply_patch before compaction removes tool declarations, while canonical/native custom-tool paths remain unchanged. This TypeScript Responses fix has no current Go-runtime counterpart.

[Ingwannu]

Final exact-head review is complete on aedfbf0. The branch contains current dev 69907dd, all review threads are resolved, local focused verification passed 138/138 plus typecheck/privacy/diff check, and React Doctor plus full cross-platform CI are green. I marked the PR ready and approved this exact head, but the repository rule still reports REVIEW_REQUIRED, so I am not using an admin bypass. @lidge-jun @Wibias, please provide the independent approval required by the branch rule; after that, this is ready for the merge train.

[olddonkey]

Readiness checklist reticked against exact head aedfbf0f5 (0 behind current dev 69907dde9).

Local attestation on this SHA: focused custom-tool/namespace/Responses repair suites 138/138, bun run typecheck, and bun run privacy:scan pass. Review threads remain resolved.

[olddonkey]

Rebased onto current dev (d5bed365c) at exact head 1c34b765a (0 behind / 1 ahead).

The runtime commits were already on dev (merge train / cherry-pick skip). Remaining delta is the architecture wording that native apply_patch stays in custom-tool form unless the destination explicitly denies Responses custom tools. bun run typecheck and bun run privacy:scan pass on this SHA.