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4be308b783Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com> Co-authored-by: nate nowack <thrast36@gmail.com>
38 lines
1.3 KiB
Text
38 lines
1.3 KiB
Text
---
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title: extensions
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sidebarTitle: extensions
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---
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# `fastmcp.server.mixins.extensions`
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Server-owned extension registration and provider composition.
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## Classes
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### `ExtensionsMixin` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/server/mixins/extensions.py#L25" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Manage explicit and provider-bundled server extensions.
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**Methods:**
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#### `add_extension` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/fastmcp_slim/fastmcp/server/mixins/extensions.py#L47" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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add_extension(self: FastMCP, extension: ServerExtension) -> None
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```
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Register a server extension (SEP-2133).
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Extensions contribute capabilities, additive request methods, tool-call
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interception, and optional lifespans. The instance is bound to this
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server. Explicit registration replaces a provider-bundled extension
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with the same identifier, even when providers were added first.
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Two explicit registrations with the same identifier are an error.
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Register before serving. Mounted servers contribute separate instances
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of extensions that opt in with `auto_register = True`; other extensions
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must be registered on the server you run.
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