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1515Each link leads to the full statement on the Thinking page:
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17* [Limit tool choice to `auto` or `none` in manual mode](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-with-tool-use): `tool_choice` options that force tool use return an error with manual extended thinking (`thinking: {type: "enabled"}`). Adaptive thinking supports forced tool use, with exceptions. Claude Opus 5.5, Claude Sonnet 5.5, Claude Fable 5.2, Claude Mythos 5.2, Claude Fable 5.1, and Claude Mythos 5.1 return a 400 error instead. Where forced tool use is accepted, it skips thinking: the response starts with the tool call.
17* [Limit tool choice to `auto` or `none` in manual mode](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-with-tool-use): with manual extended thinking (`thinking: {type: "enabled"}`), `tool_choice` options that force tool use return an error.
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19* [Check forced tool use on your model in adaptive mode](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-with-tool-use): with adaptive thinking, the result depends on the model:
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21 * **Claude Opus 5.5, Claude Sonnet 5.5, Claude Fable 5.2, Claude Mythos 5.2, Claude Fable 5.1, and Claude Mythos 5.1:** Forced tool use returns a 400 error.
22 * **Other models:** Forced tool use is accepted, and it skips thinking. The response starts with the tool call.
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1824* [Keep one thinking configuration per assistant turn](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-with-tool-use): a tool-use loop is one assistant turn, so change the configuration only between turns.
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1926* [Pass thinking blocks back complete and unmodified](https://platform.claude.com/docs/en/build-with-claude/thinking#preserving-thinking-blocks): when you return a tool result, the thinking blocks from the assistant message must come back with it.
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2028* [Echo the assistant message exactly as received](https://platform.claude.com/docs/en/build-with-claude/thinking#preserving-thinking-blocks): rebuilding the message or filtering out `redacted_thinking` blocks triggers a 400 error.
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2230The samples use adaptive thinking; on models that support only extended thinking, substitute `thinking: {type: "enabled", budget_tokens: N}`. The round-trip rules are identical.
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316324 <CodeGroup exclude="shell:cURL, shell:CLI">
317325 <CodeGroupItem language="cURL">
318 This workflow needs more logic than a single shell command. Use the [Claude SDK](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) to run it.
326 This workflow needs more logic than a single shell command. Use the [Anthropic SDK](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) to run it.
319327 </CodeGroupItem>
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321329 <CodeGroupItem language="CLI">
322 This workflow needs more logic than a single shell command. Use the [Claude SDK](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) to run it.
330 This workflow needs more logic than a single shell command. Use the [Anthropic SDK](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) to run it.
323331 </CodeGroupItem>
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325333 ```python Python
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