feat(ai, adapters): add chat({ toolChoice }) for every adapter by AlemTuzlak · Pull Request #1696 · TanStack/ai

AlemTuzlak · 2026-10-09T15:55:30Z

You can now tell the model when to call a tool, with one option for every adapter: chat({ toolChoice }). It takes 'auto', 'none', 'required', or { type: 'tool', name }. Before, you set a provider-specific tool_choice inside modelOptions.

Stacked on #1692 (reasoning). The Claude rule "thinking on → auto" reads the thinking fields that chat({ reasoning }) sets. Merge #1692 first. GitHub then moves this PR to main.

This PR is split out of #1555.

🎯 Changes

Core: chat({ toolChoice }), and a per-call toolChoice from middleware onConfig, which applies to the next model call only. A value in modelOptions still wins. Nothing is sent when the request has no tools.
Provider adapters: OpenAI and Azure (Responses), the openai-base adapters, Anthropic, Bedrock, Gemini, Grok, Mistral, and OpenRouter send their own tool_choice field.
- Claude fallback: on models that cannot force a tool (Fable 5.1, Mythos 5.1, Opus 5.5, Sonnet 5.5), or on any Claude with thinking on, a forced choice falls back to auto. Each model's "cannot force" flag is supports.forced_tool_choice: false in its object in model-meta.ts. Bedrock keeps a list of family names, because its generated catalog has no Claude 5.x entries.
- Bedrock: Converse has no none, so after tool calls it sends the tools with auto.
- Ollama: it ignores toolChoice.
CLI-style adapters (Claude Code, Codex, OpenCode, Grok Build, ACP): each one follows the values it can. For the values it cannot follow, it logs one warning per adapter instance.
Not in this PR:
- Bedrock native JSON-schema structured output for Claude 5.x. That will be a separate PR.
- The single subagent tool, the harness step limit, prompt caching, and replay.
Docs:
- A new "Choose when the model calls a tool" section in tools/tools.md.
- "Change the tool choice of a call" in advanced/middleware.md.
- A "Tool choice" section on the 5 CLI adapter pages and on ollama.md.
- The Vercel AI SDK migration row now points to top-level toolChoice.
Changesets: tool-choice-core (minor for @tanstack/ai and openai-base), tool-choice-adapters, and tool-choice-cli-adapters (patch).

✅ Checklist

I have followed the steps in the Contributing guide.
I have tested code changes locally with pnpm run test:pr, or these tests do not apply to this pull request.
I fully understand the code in this pull request, including any code generated with AI assistance.
Docs: I updated docs/ for this change, or this change is not user-facing.
Changeset: I added a changeset (pnpm changeset), or this PR does not change a published package.

🚀 Release Impact

This change affects published code, and I have generated a changeset.
This change is docs/CI/dev-only (no release).

Testing

Commands run

The full vitest run (--maxWorkers=2), test:types, and test:oxlint in all 20 changed packages. All pass. That includes the adapters on openai-base that only got tests.
pnpm test:docs: no broken links. kiira check on the 9 changed pages: 127 snippets pass.
tsc on testing/e2e: no errors in the changed files.
Not run locally: pnpm test:pr and the E2E suite. CI runs them.

Manual test

Run pnpm --dir packages/ai exec vitest run tests/tool-choice.test.ts.
Run the Anthropic and Bedrock suites. Check these cases:
- { type: 'tool', name } is sent as tool_choice.
- Sonnet 5.5, or any Claude with thinking on, gets auto instead.
- Bedrock sends auto for 'none' after tool calls.

How this PR makes testing easy

Unit and wire tests for each adapter.
A new E2E spec tool-choice.spec.ts, with route api.tool-choice-wire.ts and fixture fixtures/tool-choice/basic.json. It checks that toolChoice reaches the wire.

Risk / rollback

Low. This is a new optional option, and with no toolChoice set the requests do not change. To undo, revert this PR.

Public API change

Before

chat({ adapter: openaiText('gpt-6.1-sol'), messages, tools, modelOptions: { tool_choice: { type: 'function', name: 'getWeather' } } })

After

chat({ adapter, messages, tools, toolChoice: { type: 'tool', name: 'getWeather' } })
chat({ adapter, messages, tools, toolChoice: 'required' })

OpenAI-compatible adapters, Anthropic, Bedrock, Gemini, Grok, Mistral, and OpenRouter send toolChoice on the wire. A tool choice in modelOptions wins. Claude models that reject a forced tool, and Claude with thinking on, get auto. Bedrock Converse sends the tools with auto for none after a tool call.

Claude Code, Codex, OpenCode, Grok Build, and ACP bridge only the chat() tools that toolChoice allows: none for 'none', and only the named tool for a named choice. Claude Code also turns its built-in tools off for those values. A value that the agent cannot follow logs one warning for each adapter instance.

OpenAI runs the tool-choice feature through /api/chat and reads tool_choice from the aimock journal. Anthropic uses /api/tool-choice-wire, which captures the request: claude-sonnet-4-5 gets the named tool, and claude-opus-5-5 gets auto.

…/tool-choice

Add Choose when the model calls a tool to the tools guide, Change the tool choice of a call to the middleware guide, a Tool choice section to the Claude Code, Codex, OpenCode, Grok Build, ACP-compatible, and Ollama pages, and fix the toolChoice row of the Vercel AI SDK migration.

changeset-bot · 2026-10-09T15:55:36Z

🦋 Changeset detected

Latest commit: 6878870

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 51 packages

Name	Type
@tanstack/ai-anthropic	Patch
@tanstack/ai-bedrock	Patch
@tanstack/ai-gemini	Patch
@tanstack/ai-grok	Patch
@tanstack/ai-mistral	Patch
@tanstack/ai-openai	Patch
@tanstack/ai-openrouter	Patch
@tanstack/ai-acp	Patch
@tanstack/ai-claude-code	Patch
@tanstack/ai-codex	Patch
@tanstack/ai-grok-build	Patch
@tanstack/ai-opencode	Patch
@tanstack/ai	Minor
@tanstack/openai-base	Minor
@tanstack/ai-code-mode-snippets	Patch
@tanstack/ai-angular	Patch
@tanstack/ai-byteplus	Patch
@tanstack/ai-client	Patch
@tanstack/ai-cloudflare	Patch
@tanstack/ai-code-mode	Patch
@tanstack/ai-cohere	Patch
@tanstack/ai-compaction	Patch
@tanstack/ai-devtools-core	Patch
@tanstack/ai-durable-stream	Patch
@tanstack/ai-elevenlabs	Patch
@tanstack/ai-fal	Patch
@tanstack/ai-groq	Patch
@tanstack/ai-llmgateway	Patch
@tanstack/ai-lovable	Patch
@tanstack/ai-mcp	Patch
@tanstack/ai-memory	Patch
@tanstack/ai-octane	Patch
@tanstack/ai-ollama	Patch
@tanstack/ai-ollaya	Patch
@tanstack/ai-perplexity	Patch
@tanstack/ai-persistence	Patch
@tanstack/ai-preact	Patch
@tanstack/ai-react	Patch
@tanstack/ai-reactor	Patch
@tanstack/ai-remix	Patch
@tanstack/ai-sandbox-cloudflare	Patch
@tanstack/ai-sandbox	Patch
@tanstack/ai-skills	Patch
@tanstack/ai-solid	Patch
@tanstack/ai-svelte	Patch
@tanstack/ai-typesafe	Patch
@tanstack/ai-vercel-gateway	Patch
@tanstack/ai-vertex	Patch
@tanstack/ai-vue	Patch
@tanstack/ai-worldlabs	Patch
ag-ui	Patch

Not sure what this means? Click here to learn what changesets are.

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Coverage

✅ Coverage held across 66 compared package(s).

Each package is measured twice in this job — on this PR and on its merge-base with main — and compared. A metric fails only when it is at or above 60% on the merge-base and under 60% on this PR. Other drops are listed but do not fail. Packages your PR doesn't affect are not measured and not listed.

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ToolChoice takes an optional name type. In chat() options, { type: 'tool', name } offers the names of the tools array and still accepts any string, for provider tools and lazy tools.

…/tool-choice

jherr

Great addition.

AlemTuzlak added 7 commits October 9, 2026 17:21

feat(ai): add chat({ toolChoice }) and a per-call toolChoice in onConfig

3823709

chore: changesets for chat({ toolChoice })

fefae57

test(e2e): check that toolChoice reaches the wire

ae1c4bb

OpenAI runs the tool-choice feature through /api/chat and reads tool_choice from the aimock journal. Anthropic uses /api/tool-choice-wire, which captures the request: claude-sonnet-4-5 gets the named tool, and claude-opus-5-5 gets auto.

Merge remote-tracking branch 'origin/feat/reasoning-option' into feat…

7ee3ebf

…/tool-choice

AlemTuzlak added 2 commits October 9, 2026 18:47

feat(ai): suggest the tool names in chat({ toolChoice })

e332c06

ToolChoice takes an optional name type. In chat() options, { type: 'tool', name } offers the names of the tools array and still accepts any string, for provider tools and lazy tools.

Merge remote-tracking branch 'origin/feat/reasoning-option' into feat…

6878870

…/tool-choice

jherr approved these changes Oct 9, 2026

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github-actions Bot assigned jherr Oct 9, 2026

github-actions Bot added ready-to-merge Approved, CI green, no conflicts waiting-on: maintainer The ball is in the maintainers’ court labels Oct 9, 2026

AlemTuzlak merged commit 78c4b83 into feat/reasoning-option Oct 9, 2026
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AlemTuzlak deleted the feat/tool-choice branch October 9, 2026 20:57

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feat(ai, adapters): add chat({ toolChoice }) for every adapter - #1696

feat(ai, adapters): add chat({ toolChoice }) for every adapter#1696
AlemTuzlak merged 9 commits into
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AlemTuzlak commented Oct 9, 2026

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