Messages changedapi/beta/messages
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1818### Headers
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20- `"anthropic-version": optional string`
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22 The version of the Claude API you want to use.
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24 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
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2026- `"anthropic-beta": optional array of AnthropicBeta`
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2228 Optional header to specify the beta version(s) you want to use.
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7202 - `configs: optional map[BetaMCPToolConfig] or null`
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7204 Configuration overrides for specific tools, keyed by tool name
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7206 - `defer_loading: optional boole
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