fix(xai): stop the undeclared-tool guard from killing hosted x_search turns - #2425
fix(xai): stop the undeclared-tool guard from killing hosted x_search turns#2425olddonkey wants to merge 3 commits into
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe change adds exact xAI Responses destination detection and authorizes provider-executed hosted tools, such as ChangesxAI hosted tool authorization
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The PR narrows undeclared-tool handling for hosted xAI search turns, and no actionable merge-blocking risk remains beyond normal checks and review. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant Client
participant ResponsesCore
participant UndeclaredToolGuard
participant xAI
Client->>ResponsesCore: submit request with hosted tool declaration
ResponsesCore->>ResponsesCore: validate xAI destination and collect call types
ResponsesCore->>xAI: forward Responses request
xAI-->>ResponsesCore: return streamed or completed custom_tool_call
ResponsesCore->>UndeclaredToolGuard: validate output with provider-executed call types
UndeclaredToolGuard-->>ResponsesCore: accept matching provider-executed call
ResponsesCore-->>Client: return validated response
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Inline comments:
In `@src/server/responses-undeclared-tool-guard.ts`:
- Around line 240-251: Update the provider-executed exemption in the
undeclared-tool validation flow so it identifies only provider-owned hosted
x_search activity, rather than exempting every item whose type appears in
providerExecutedCallTypes; preserve declared-name checks for client-executed
custom_tool_call values. If no reliable provider discriminator exists, reject
unknown custom_tool_call names instead of returning early. Add a regression case
in the existing undeclared-tool guard tests covering an undeclared
custom_tool_call such as apply_patch.
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src/providers/xai-transport.tssrc/server/responses-undeclared-tool-guard.tssrc/server/responses/core.tstests/responses-undeclared-tool-guard.test.ts
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리뷰 · 우선순위 54 / 80설명: 이 PR 은 엑스아이가 직접 돌리는 검색을, 선언 안 된 클라이언트 도구로 오해해서 턴을 죽이던 것을 그만둔다. 지금 CURRENT 지금 HEAD 의 src/server/responses-undeclared-tool-guard.ts 5줄은 function_call 과 custom_tool_call 을 클라이언트가 실행하는 칸으로 본다. 36줄 NAMELESS_TOOL_SPEC_TYPES 에는 이미 x_search 가 있다. 선언은 호스트가 돌리는 도구로 읽지만, 응답 칸 종류는 custom_tool_call 이다. 202줄은 그 칸에 이름이 있고 선언 목록에 없으면 거절한다. src/server/responses/core.ts 3033줄은 선언된 이름 도구가 있거나, 이름 없는 클라이언트 종류가 있거나, 읽을 수 있는 목록이 있으면 가드를 켠다. 3713줄이 그 가드를 스트림에 붙인다. 그래서 셸처럼 이름 있는 도구와 x_search 를 같이 넣으면, 엑스아이가 낸 x_keyword_search 같은 이름이 선언에 없어서 턴이 실패한다. 작성자가 2026-08-22 에 같은 요청으로 재현했다. 엑스아이에 직접 보내면 200 과 글이 나온다. 오픈코덱스를 거치면 response.failed 이고 글자 수는 0 이다. x_search 만 넣으면 통과했다고 했다. 이 PR 은 반대쪽 지도를 하나 더 둔다. PROVIDER_EXECUTED_DECLARATION_CALL_TYPES 는 x_search 선언을 custom_tool_call 칸으로 연결한다. 그 칸은 제공자가 스스로 실행하니 클라이언트 이름이 없어도 된다. 문을 두 개 다 통과해야 한다. 목적지가 진짜 엑스아이일 것, 그리고 이번 턴이 x_search 를 선언했을 것. src/providers/xai-transport.ts 에 새로 생긴 isXaiResponsesDestination 은 api.x.ai 와 cli-chat-proxy.grok.com 만, https, 기본 포트 또는 443 만 참이다. 닮은 호스트와 이상한 포트는 빠진다. 이름은 절대 맞추지 않는다. 한 턴에서 x_keyword_search 와 x_semantic_search 가 나왔고, 다른 호스트는 x_user_search 를 냈다. 세 글자가 한 도구다. 남은 위험은 작성자가 일부러 남겼다. x_search 를 켠 엑스아이 턴 안에서는, 모델이 지어낸 클라이언트 custom_tool_call 도 같이 통과한다. apply_patch 같은 function_call 은 그 턴 안에서도 거절한다. 시험이 그 음수를 잠근다. 작성자는 olddonkey 이다. 드래프트다. bug 라벨만 있다. 체크리스트는 네 칸 중 영 칸이다. 위생은 통과다. CodeRabbit 은 통과로 적었지만, 머지 위험은 그 남은 위험을 가리킨다. 작성자 로컬은 기준선 대비 회귀가 없다고 적었다. Closes 가 없다. 사용자 길이로는 엑스아이 검색 턴이 글 없이 죽는 구멍이라서 54. 카탈로그 팁은 Ox Alpha x-preview-f-free + deepseek-v4-flash-vision-exp. Cursor 정적 카탈로그는 opus-4-8-fast / opus-5-fast. 2334 CursorCredentialRouter 는 여전히 src/providers/cursor-pool.ts 모듈+테스트만 있고 어댑터에 연결되지 않았다. 2332 H2 는 discovery 전용. 2320 overflow + 2342 는 이미 dev. 2188 사이드카는 이미 dev. 2382 데스크톱 앱 재시작은 이미 dev. 2292 는 아직 연다. src/server/responses-undeclared-tool-guard.ts 라인 5 - 지금 HEAD 는 custom_tool_call 을 클라이언트가 실행하는 칸으로 본다 메인테이너의 판단이 필요한 지점
너의 추천 이 댓글은 grok-bot이 작성했습니다 |
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Updated after review — the first version had a real hole, and its regression test hid it. The hole. The exemption keyed on item type alone, so it exempted every The fix. Measured 2026-08-23 against Names are still never matched — three literals have been observed for this one tool ( The #1700 test now uses the real shape: an undeclared Also from review: One review point I did not adopt, because measurement contradicts it: the claim that a bare Gate: 14436 pass / 3 fail, all in the load-sensitive |
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@coderabbitai review |
✅ Action performedReview finished.
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@coderabbitai Resolved — you and the Codex review independently landed on the same defect, which is a strong signal it was the real one. The exemption keyed on item type alone, so it exempted every Names are deliberately not matched — three literals have been observed for this one tool ( The regression test that was supposed to prove #1700 survived had used a |
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The current xs_call- narrowing is materially safer than the first revision, and the exact-head focused suite (97 passed) plus typecheck are green under the repository-pinned Bun 1.4.0. I am still requesting two correctness/documentation fixes before approval.
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The claimed destination boundary is not exercised through the real request path. The new guard tests construct the authorization set directly, and the “destination” negative case only passes an empty set by hand. Add an end-to-end
handleResponsesregression with a named client tool plusx_searchshowing that anxs_call-hosted item is accepted for an exact xAI destination, while the identical item is rejected for a non-xAI/lookalike destination. Also pinisXaiResponsesDestinationitself for both accepted hosts, HTTPS/default 443, and negative scheme/port/lookalike cases. This is the boundary that prevents the exemption from reaching arbitrary Responses providers, so it should not depend on untestedcore.tswiring. -
Update the PR description to match the current head. It still describes only destination + declaration gates and says every hallucinated
custom_tool_callin an authorized turn is exempted, but the current code adds a third requiredxs_call-prefix. It also says the guard activates only when a named client tool exists; currenthasExplicitWireToolCatalogtreatsx_searchas a readable nameless catalog, so that explanation is not true for currentdev. Please describe the measured reproduction without attributing it to that activation condition, and document the remaining prefix-based residual risk accurately.
No broader refactor is needed. Keep the exact-host, declaration, item-type, and call-id-prefix scope narrow, then rerun the two focused test files and typecheck on the updated head.
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Addressed the requested destination-boundary coverage in 73dd8b3 and updated the PR description to the current four-scope contract (exact xAI destination + x_search declaration + custom_tool_call item + xs_call- prefix). The real handleResponses path now accepts the measured item for api.x.ai and rejects the identical item for api.x.ai.evil.test; direct transport tests cover both accepted hosts and the scheme/port/lookalike negatives. Verification on Bun 1.4.0: 108 focused tests passed and typecheck passed. The PR remains Draft until the exact-head readiness gates are rerun. |
… turns
xAI executes hosted `x_search` itself and reports the activity as a
`custom_tool_call` whose name is deliberately absent from the request
catalog. The guard treats every `custom_tool_call` as client-executed, so
once a request also declares any NAMED client tool the guard trips on
xAI's own hosted call and fails the whole turn.
Reproduced 2026-08-22 with the identical request
({type:"function",name:"shell"} + {type:"x_search"}):
direct to xAI 200, custom_tool_call + message, 10 annotations
through opencodex response.failed, no response.completed,
reasoning item only, 0 output chars
A request declaring ONLY x_search passes, because the guard activates
only once a named client tool exists — which is why this is easy to miss
with a minimal repro and why every realistic Codex request would hit it.
The fix mirrors the existing NAMELESS_CLIENT_DECLARATION_CALL_TYPES in
the other direction: PROVIDER_EXECUTED_DECLARATION_CALL_TYPES maps a
hosted declaration to the item type the provider emits for it, and those
items need no client name to be authorized.
Two gates, both required, so this cannot widen into a blanket exemption:
destination core.ts passes an empty set unless the route actually
terminates at xAI (isXaiResponsesDestination: exact host,
https, standard port — lookalikes and odd ports excluded)
declaration the turn must actually declare x_search
Names are never matched. One turn emitted `x_keyword_search` and
`x_semantic_search`, and the other xAI host emits `x_user_search` — three
literals for one tool, so the name channel carries no signal.
RESIDUAL RISK, accepted deliberately and documented at the branch: inside
a turn that declared x_search on xAI, a hallucinated client custom tool is
exempted too, precisely because names cannot be trusted. The alternative is
failing every hosted-search turn. lidge-jun#1700's protection is untouched for every
other turn, provider and item type.
Tests pin the two gates in the negative direction as well as the positive:
no declaration still refuses, empty authorization still refuses, and
apply_patch is still refused INSIDE an authorized turn.
Gate: 14438 pass / 1 fail; that failure also fails on untouched
upstream/dev at the same commit (baseline: 4 fail, a superset). Zero
regressions.
Review caught that the previous shape exempted EVERY custom_tool_call inside an authorized turn — and apply_patch, the tool lidge-jun#1700 exists to protect, arrives as a custom_tool_call (see the repo's own 'never blocks apply_patch' test). The regression test written to prove lidge-jun#1700 survived used a function_call, which the exemption never touched, so it asserted something true but irrelevant. Measured 2026-08-23 against cli-chat-proxy.grok.com, a hosted x_search item is {type:custom_tool_call, name:x_keyword_search, call_id:xs_call-428a4403-...}. Authorization now requires the item type AND that call-id prefix, on top of the existing destination and declaration gates. Names are still never matched — three literals have been observed for this one tool. The lidge-jun#1700 test now uses the real shape: an undeclared custom_tool_call named apply_patch with an ordinary call_id, inside an authorized turn, still refused. core.ts passes a correctly-typed empty set on the non-xAI branch, so a Set<string> is now a compile error rather than a silent no-op.
73dd8b3 to
8efcacd
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Rebased onto current |
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@coderabbitai review |
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Addressed on exact head 8efcacd; the PR remains draft pending readiness and full exact-head CI.
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Rechecked exact head The two requested blockers are resolved:
Local verification with the repository-pinned Bun 1.4.0 passed: 108 focused tests and This should remain draft and must not merge until the author completes the readiness checklist, marks it ready, and required CI is green on this exact head. A final approval can follow then. |
3 participants
Summary
x_searchitself and reports the activity as acustom_tool_callwhose name is absent from the request catalog.shelltool plusx_searchreturned a complete answer directly from xAI, but failed through OpenCodex withresponse.failed, noresponse.completed, and zero output text.api.x.aiorcli-chat-proxy.grok.comover HTTPS on the standard port;x_search;custom_tool_call; andcall_idbegins with the measuredxs_call-prefix.x_keyword_search,x_semantic_search, andx_user_searchfor the same hosted declaration.Verification
./node_modules/.bin/bun test tests/responses-undeclared-tool-guard.test.ts tests/xai-transport.test.ts— 108 passed on Bun 1.4.0 at8efcacd16../node_modules/.bin/bun run typecheck— passed.handleResponsespath accepts the measured item for an exact xAI destination and rejects the identical item forapi.x.ai.evil.test.dev; the full-suite PR-ready gate has not been claimed.Residual risk
Names carry no stable authorization signal, so an exact xAI turn that declared
x_searchwill accept anycustom_tool_callname when itscall_idis in the measuredxs_call-namespace. The exemption does not extend to a different destination, a turn withoutx_search, another item type, or another call-id prefix. In particular, the existing undeclaredapply_patchguard remains active.Checklist
Review readiness checklist
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