refactor(providers): map xAI tool_choice to the Responses API shape with a typed request body by easonLiangWorldedtech · Pull Request #2036 · Zoo-Code-Org/Zoo-Code

easonLiangWorldedtech · 2026-10-13T02:52:31Z

What

Extracted from the abort-signal series unit (PR 1293) at reviewer request, so that unit stays abort-wiring only:

xai: replace the as any tool_choice cast with an explicit mapToolChoice mapping — Chat Completions nests named-tool references under function/custom, the Responses API puts the name at the top level; allowed_tools allowlist entries are flattened to the Responses shape, other entry types pass through unchanged.
xai: type the request body as ResponseCreateParamsStreaming (drops five lint suppressions: xai.ts no-explicit-any count 7 → 2) and send max_output_tokens/temperature unconditionally — getModel() always resolves them.
anthropic-vertex: drop the no-op content_block_stop case (its own comment noted no action is needed; NativeToolCallParser handles tool-call completion).

Why

Requested in review on the abort-signal unit: these hunks are tool-payload correctness/typing, orthogonal to abort wiring.

Verification

75/75 green in xai.spec.ts + anthropic-vertex.spec.ts (five new mapping/param tests ported with the change)
tsc --noEmit → 0 errors
per-file ESLint (--max-warnings=0) clean on touched files
prettier --check clean on touched files

Updated this round (2026-10-13, review follow-up)

mapToolChoice now rejects allowed_tools entries of type "function" whose name is missing or not a string, before responses.create is called (the nested Chat Completions shape cannot express the allowlist entry in the Responses API, and xAI's handling of the malformed payload is unspecified). Non-function entries still pass through unchanged.
Pass-through test narrowed to the non-function case; new test rejects four malformed function-entry shapes and asserts no request is issued (negative control verified).

Verification at this head: 25/25 green in xai.spec.ts; tsc --noEmit → 0 errors; per-file ESLint (--max-warnings=0) clean; prettier --check clean on touched files.

…ith a typed request body Extracted from the abort-signal series unit (PR 1293) at reviewer request so that unit stays abort-wiring only: - xai: replace the `as any` tool_choice cast with an explicit mapToolChoice mapping (Chat Completions nests named-tool references under function/custom; the Responses API puts the name at the top level; allowed_tools entries are flattened). - xai: type the request body as ResponseCreateParamsStreaming (drops five lint suppressions) and send max_output_tokens/temperature unconditionally - getModel() always resolves them. - anthropic-vertex: drop the no-op content_block_stop case (the comment itself noted no action is needed; NativeToolCallParser handles tool-call completion). Verification: 75/75 green in xai.spec.ts + anthropic-vertex.spec.ts; tsc --noEmit 0 errors; eslint --max-warnings=0 clean on touched files (xai.ts suppression count 7 -> 2); prettier clean.

coderabbitai · 2026-10-13T02:52:41Z

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Reviewing files that changed from the base of the PR and between a203c7a and 682665e.

Files selected for processing: 2

src/api/providers/__tests__/xai.spec.ts
src/api/providers/xai.ts

📝 Summary

Summary by CodeRabbit

Bug Fixes
- Improved tool-choice handling for xAI responses, including named function and custom choices, allowed tools, and automatic selection when a choice is not specified.
- Invalid function tool entries are now rejected before a request is sent.
- xAI requests now consistently apply resolved token and temperature settings and enable parallel tool calls by default when tools are included.
- Prompt completion requests now forward usable timeout settings and omit unusable ones.

The xAI handler now maps Chat Completions tool choices to Responses API request shapes. It builds a typed request with resolved token and temperature settings. Tests cover tool-choice mapping, malformed entries, request options, and model defaults.

Changes: xAI Responses API request mapping

Layer / File(s)	Summary
Map and validate tool choices `src/api/providers/xai.ts`, `src/api/providers/__tests__/xai.spec.ts`	The handler maps function and custom tool choices and flattens function entries in `allowed_tools`. It rejects malformed function entries. Tests cover mapped and pass-through choices.
Build typed requests and apply defaults `src/api/providers/xai.ts`, `src/api/providers/__tests__/xai.spec.ts`, `src/eslint-suppressions.json`	The handler uses a typed Responses API request, assigns token and temperature settings, and applies tool-choice and parallel-call defaults. Tests check request bodies, abort signals, and timeout options. The lint suppression count is reduced.

Priority: Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Possibly related PRs

Zoo-Code-Org/Zoo-Code#1293: Added xAI abort-signal handling and request-shape tests that this PR updates.

Merge Risk: Low · up to a203c

Malformed requests are rejected before reaching xAI, but repeated rejected requests can leave abort listeners attached. Fix the cleanup path before merging, or accept this bounded risk.

Pre-merge checks: 6 · 2

Failed checks: 2 warnings

Check name	Status	Explanation	Resolution
Regression Evidence		The changed validation rejects an `allowed_tools` function entry when its `name` property is absent (`src/api/providers/xai.ts:95-104`). The negative test covers `name: null`, `name: 123`, a null `fun…	Add a focused `createMessage` negative case for an allowed-tools entry with an absent name, such as `{ type: "function", function: {} }` (and preferably `{ type: "function" }`). Assert the same validation error and assert that `responses.cr…
Lifecycle Resource Cleanup		The changed malformed-entry path leaks an abort listener. `createMessage` calls `bridgeExternalAbortSignal` at `src/api/providers/xai.ts:167-169`, which attaches a listener to a live external signal a…	Ensure all request preparation that can throw, including `mapToolChoice`, is covered by the cleanup `try/finally`, or perform the mapping before calling `bridgeExternalAbortSignal`. Add a regression test with a live external abort signal th…

Passed checks: 6 passed

Check name	Status	Explanation
Title check		The title clearly and concisely describes the primary xAI change: mapping tool_choice to the Responses API shape with a typed request body.
Description check		The description clearly explains the changes, motivation, implementation details, review focus, and verification results. It omits the template's explicit approved issue link and completed checklist, …
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Security Boundaries		No changed path meets the security failure condition. In `src/api/providers/xai.ts:84-124`, `mapToolChoice` maps named choices and rejects function allowlist entries without a string name. Non-functio…
Persistence Integrity		No changed persistence path exists. The PR changes xAI request-body typing, tool-choice mapping, model parameters, and related tests. The only changed operation is the awaited `responses.create` API c…

Full details: Description check

Explanation

The description clearly explains the changes, motivation, implementation details, review focus, and verification results. It omits the template's explicit approved issue link and completed checklist, but the core description is complete and relevant.

Full details: Security Boundaries

Explanation

No changed path meets the security failure condition. In src/api/providers/xai.ts:84-124, mapToolChoice maps named choices and rejects function allowlist entries without a string name. Non-function allowlist entries are forwarded as API data; the code does not execute them. In src/api/providers/xai.ts:185-191, the mapped choice is sent only with the declared responseTools. The changed request typing and unconditional model parameters do not expose secrets or PII, and no approval or tool-execution control changes in the reviewed diff.

Full details: Persistence Integrity

Explanation

No changed persistence path exists. The PR changes xAI request-body typing, tool-choice mapping, model parameters, and related tests. The only changed operation is the awaited responses.create API call; no persistence write, non-atomic update, rollback path, or persisted-default consumer is introduced.

Full details: Regression Evidence

Explanation

The changed validation rejects an allowed_tools function entry when its name property is absent (src/api/providers/xai.ts:95-104). The negative test covers name: null, name: 123, a null function, and a function-valued function (src/api/providers/__tests__/xai.spec.ts:393-415), but it does not cover { type: "function", function: {} } or an omitted function property. This is a concrete unset-input branch that can regress while the current tests still pass.

Resolution

Add a focused createMessage negative case for an allowed-tools entry with an absent name, such as { type: "function", function: {} } (and preferably { type: "function" }). Assert the same validation error and assert that responses.create is not called.

Full details: Lifecycle Resource Cleanup

Explanation

The changed malformed-entry path leaks an abort listener. createMessage calls bridgeExternalAbortSignal at src/api/providers/xai.ts:167-169, which attaches a listener to a live external signal and requires dispose(); the helper confirms this at src/api/providers/utils/abort-signal.ts:98-105. When response tools exist, the new mapToolChoice call at xai.ts:185-190 throws for a malformed allowed_tools function entry at lines 109-119. This occurs before the try/finally at lines 200-239, so cleanup does not run. Repeated requests with a long-lived, non-aborted metadata.abortSignal and malformed entries retain one listener and controller per request, although responses.create is never called.

Resolution

Ensure all request preparation that can throw, including mapToolChoice, is covered by the cleanup try/finally, or perform the mapping before calling bridgeExternalAbortSignal. Add a regression test with a live external abort signal that verifies the listener is removed when malformed allowed_tools input rejects.

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codecov · 2026-10-13T03:03:59Z

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✅ All modified and coverable lines are covered by tests.

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github-actions · 2026-10-13T03:15:43Z

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/api/providers/xai.ts:
- Line 105: Update the allowed-tools handling in mapToolChoice to reject
function entries with null or non-string names before calling responses.create.
Preserve the existing mapping for valid function names.

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📒 Files selected for processing (4)

src/api/providers/__tests__/xai.spec.ts
src/api/providers/anthropic-vertex.ts
src/api/providers/xai.ts
src/eslint-suppressions.json

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src/api/providers/anthropic-vertex.ts

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