tool-search-tool changedagents-and-tools/tool-use/tool-search-tool
Nearest release: v2.1.252, published 4 hours before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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2424</Note>
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2626<Note>
27 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).
27 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).
2828</Note>
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785785## Prompt caching
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787For how `defer_loading` preserves prompt caching, see [Tool use with prompt caching](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-use-with-prompt-caching).
787To learn how `defer_loading` preserves prompt caching, see [Tool use with prompt caching](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-use-with-prompt-caching).
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789789A tool with `defer_loading: true` can't also carry `cache_control`: the API returns a 400. Put the cache breakpoint on a non-deferred tool.
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