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145dbbfb4cCo-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com>
64 lines
2.3 KiB
Text
64 lines
2.3 KiB
Text
---
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title: config
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sidebarTitle: config
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---
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# `fastmcp.apps.config`
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MCP Apps support — extension negotiation and typed UI metadata models.
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Provides constants and Pydantic models for the MCP Apps extension
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(io.modelcontextprotocol/ui), enabling tools and resources to carry
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UI metadata for clients that support interactive app rendering.
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## Functions
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### `app_config_to_meta_dict` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/apps/config.py#L117" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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app_config_to_meta_dict(app: AppConfig | dict[str, Any]) -> dict[str, Any]
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```
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Convert an AppConfig or dict to the wire-format dict for ``meta["ui"]``.
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## Classes
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### `ResourceCSP` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/apps/config.py#L20" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Content Security Policy for MCP App resources.
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Declares which external origins the app is allowed to connect to or
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load resources from. Hosts use these declarations to build the
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``Content-Security-Policy`` header for the sandboxed iframe.
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### `ResourcePermissions` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/apps/config.py#L52" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Iframe sandbox permissions for MCP App resources.
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Each field, when set (typically to ``{}``), requests that the host
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grant the corresponding Permission Policy feature to the sandboxed
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iframe. Hosts MAY honour these; apps should use JS feature detection
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as a fallback.
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### `AppConfig` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/apps/config.py#L79" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Configuration for MCP App tools and resources.
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Controls how a tool or resource participates in the MCP Apps extension.
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On tools, ``resource_uri`` and ``visibility`` specify which UI resource
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to render and where the tool appears. On resources, those fields must
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be left unset (the resource itself is the UI).
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All fields use ``exclude_none`` serialization so only explicitly-set
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values appear on the wire. Aliases match the MCP Apps wire format
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(camelCase).
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