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77<Note>
8 For how zero data retention (ZDR) applies to this feature, see [API and data retention](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention).
8 To learn how zero data retention (ZDR) applies to this feature, see [API and data retention](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention).
99</Note>
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1111This page walks through a complete two-turn tool-use round trip with thinking enabled: Claude thinks, requests a tool call, receives the result, and finishes its answer, with the thinking blocks handled correctly at every step. The full rules live on the [Thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) page, in [Thinking with tool use](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-with-tool-use) and [Preserving thinking blocks](https://platform.claude.com/docs/en/build-with-claude/thinking#preserving-thinking-blocks); this page shows those rules applied in runnable code.