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fastmcp.tools.tool

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Functions

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default_serializer 

default_serializer(data: Any) -> str

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Classes

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ToolResult

Methods:

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to_mcp_result 

to_mcp_result(self) -> list[ContentBlock] | tuple[list[ContentBlock], dict[str, Any]]

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Tool

Internal tool registration info. Methods:

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enable 

enable(self) -> None

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disable 

disable(self) -> None

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to_mcp_tool 

to_mcp_tool(self, **overrides: Any) -> MCPTool

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from_function 

from_function(fn: Callable[..., Any], name: str | None = None, title: str | None = None, description: str | None = None, tags: set[str] | None = None, annotations: ToolAnnotations | None = None, exclude_args: list[str] | None = None, output_schema: dict[str, Any] | None | NotSetT | Literal[False] = NotSet, serializer: Callable[[Any], str] | None = None, meta: dict[str, Any] | None = None, enabled: bool | None = None) -> FunctionTool
Create a Tool from a function.

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run 

run(self, arguments: dict[str, Any]) -> ToolResult
Run the tool with arguments. This method is not implemented in the base Tool class and must be implemented by subclasses. run() can EITHER return a list of ContentBlocks, or a tuple of (list of ContentBlocks, dict of structured output).

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from_tool 

from_tool(cls, tool: Tool, transform_fn: Callable[..., Any] | None = None, name: str | None = None, title: str | None | NotSetT = NotSet, transform_args: dict[str, ArgTransform] | None = None, description: str | None | NotSetT = NotSet, tags: set[str] | None = None, annotations: ToolAnnotations | None = None, output_schema: dict[str, Any] | None | Literal[False] = None, serializer: Callable[[Any], str] | None = None, meta: dict[str, Any] | None | NotSetT = NotSet, enabled: bool | None = None) -> TransformedTool

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FunctionTool

Methods:

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from_function 

from_function(cls, fn: Callable[..., Any], name: str | None = None, title: str | None = None, description: str | None = None, tags: set[str] | None = None, annotations: ToolAnnotations | None = None, exclude_args: list[str] | None = None, output_schema: dict[str, Any] | None | NotSetT | Literal[False] = NotSet, serializer: Callable[[Any], str] | None = None, meta: dict[str, Any] | None = None, enabled: bool | None = None) -> FunctionTool
Create a Tool from a function.

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run 

run(self, arguments: dict[str, Any]) -> ToolResult
Run the tool with arguments.

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ParsedFunction

Methods:

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from_function 

from_function(cls, fn: Callable[..., Any], exclude_args: list[str] | None = None, validate: bool = True, wrap_non_object_output_schema: bool = True) -> ParsedFunction