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MCPServer

class MCPServer:

Decorator class for registering functions of a class as tools in an MCP (Model Context Protocol) server.

This class is typically used to wrap a toolkit or service class and automatically register specified methods (or methods derived from BaseToolkit) with a FastMCP server.

Parameters:

  • function_names (Optional[list[str]]): A list of method names to expose via the MCP server. If not provided and the class is a subclass of BaseToolkit, method names will be inferred from the tools returned by get_tools().
  • server_name (Optional[str]): A name for the MCP server. If not provided, the class name of the decorated object is used.

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init

def __init__(
    self,
    function_names: Optional[list[str]] = None,
    server_name: Optional[str] = None
):

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make_wrapper

def make_wrapper(self, func: Callable[..., Any]):

Wraps a function (sync or async) to preserve its signature and metadata.

This is used to ensure the MCP server can correctly call and introspect the method.

Parameters:

  • func (Callable[…, Any]): The function to wrap.

Returns:

Callable[…, Any]: The wrapped function, with preserved signature and async support.

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call

def __call__(self, cls):

Decorates a class by injecting an MCP server instance and registering specified methods.

Parameters:

  • cls (type): The class being decorated.

Returns:

type: The modified class with MCP integration.