`fastmcp.resources.function_resource`

Standalone @resource decorator for FastMCP.

Functions

`resource`

resource(uri: str) -> Callable[[F], F]

Standalone decorator to mark a function as an MCP resource. Returns the original function with metadata attached. Register with a server using mcp.add_resource().

Classes

`DecoratedResource`

Protocol for functions decorated with @resource.

`ResourceMeta`

Metadata attached to functions by the @resource decorator.

`FunctionResource`

A resource that defers data loading by wrapping a function. The function is only called when the resource is read, allowing for lazy loading of potentially expensive data. This is particularly useful when listing resources, as the function won’t be called until the resource is actually accessed. The function can return:

str for text content (default)
bytes for binary content
other types will be converted to JSON

Methods:

`from_function`

from_function(cls, fn: Callable[..., Any], uri: str | AnyUrl | None = None) -> FunctionResource

Create a FunctionResource from a function. Args:

fn: The function to wrap
uri: The URI for the resource (required if metadata not provided)
metadata: ResourceMeta object with all configuration. If provided, individual parameters must not be passed.
name, title, etc.: Individual parameters for backwards compatibility. Cannot be used together with metadata parameter.

`read`

read(self) -> str | bytes | ResourceResult

Read the resource by calling the wrapped function.

⌘I

fastmcp.apps

fastmcp.experimental