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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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1111The bash tool is a [client tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/how-tool-use-works): Claude doesn't run commands itself. When you include the tool in a request, Claude replies with a `tool_use` block that names the command to run. Your application runs that command in a bash session it owns and returns the output in a `tool_result` block.