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1414This guide covers common patterns for working with the Messages API, including basic requests, multi-turn conversations, prefill techniques, and vision capabilities. For complete API specifications, see the [Messages API reference](https://platform.claude.com/docs/en/api/messages/create). For the managed agent harness instead, see the [Claude Managed Agents overview](https://platform.claude.com/docs/en/managed-agents/overview).
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1616<Note>
17 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).
17 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).
1818</Note>
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2020## Basic request and response