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74eb8a0645Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com>
183 lines
7.3 KiB
Text
183 lines
7.3 KiB
Text
---
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title: tool
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sidebarTitle: tool
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---
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# `fastmcp.tools.tool`
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## Functions
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### `default_serializer` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L75" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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default_serializer(data: Any) -> str
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```
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## Classes
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### `ToolResult` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L79" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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**Methods:**
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#### `to_mcp_result` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L124" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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to_mcp_result(self) -> list[ContentBlock] | tuple[list[ContentBlock], dict[str, Any]] | CallToolResult
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```
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### `Tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L140" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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Internal tool registration info.
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**Methods:**
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#### `to_mcp_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L172" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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to_mcp_tool(self, **overrides: Any) -> MCPTool
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```
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Convert the FastMCP tool to an MCP tool.
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#### `from_function` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L201" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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from_function(fn: Callable[..., Any], name: str | None = None, title: str | None = None, description: str | None = None, icons: list[Icon] | None = None, tags: set[str] | None = None, annotations: ToolAnnotations | None = None, exclude_args: list[str] | None = None, output_schema: dict[str, Any] | NotSetT | None = NotSet, serializer: ToolResultSerializerType | None = None, meta: dict[str, Any] | None = None, task: bool | TaskConfig | None = None) -> FunctionTool
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```
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Create a Tool from a function.
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#### `run` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L231" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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run(self, arguments: dict[str, Any]) -> ToolResult
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```
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Run the tool with arguments.
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This method is not implemented in the base Tool class and must be
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implemented by subclasses.
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`run()` can EITHER return a list of ContentBlocks, or a tuple of
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(list of ContentBlocks, dict of structured output).
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#### `convert_result` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L243" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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convert_result(self, raw_value: Any) -> ToolResult
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```
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Convert a raw result to ToolResult.
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Handles ToolResult passthrough and converts raw values using the tool's
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attributes (serializer, output_schema) for proper conversion.
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#### `register_with_docket` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L335" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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register_with_docket(self, docket: Docket) -> None
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```
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Register this tool with docket for background execution.
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#### `add_to_docket` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L341" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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add_to_docket(self, docket: Docket, arguments: dict[str, Any], **kwargs: Any) -> Execution
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```
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Schedule this tool for background execution via docket.
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**Args:**
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- `docket`: The Docket instance
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- `arguments`: Tool arguments
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- `fn_key`: Function lookup key in Docket registry (defaults to self.key)
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- `task_key`: Redis storage key for the result
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- `**kwargs`: Additional kwargs passed to docket.add()
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#### `from_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L365" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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from_tool(cls, tool: Tool) -> TransformedTool
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```
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### `FunctionTool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L397" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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**Methods:**
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#### `to_mcp_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L400" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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to_mcp_tool(self, **overrides: Any) -> MCPTool
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```
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Convert the FastMCP tool to an MCP tool.
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Extends the base implementation to add task execution mode if enabled.
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#### `from_function` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L423" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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from_function(cls, fn: Callable[..., Any], name: str | None = None, title: str | None = None, description: str | None = None, icons: list[Icon] | None = None, tags: set[str] | None = None, annotations: ToolAnnotations | None = None, exclude_args: list[str] | None = None, output_schema: dict[str, Any] | NotSetT | None = NotSet, serializer: ToolResultSerializerType | None = None, meta: dict[str, Any] | None = None, task: bool | TaskConfig | None = None) -> FunctionTool
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```
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Create a Tool from a function.
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#### `run` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L501" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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run(self, arguments: dict[str, Any]) -> ToolResult
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```
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Run the tool with arguments.
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#### `register_with_docket` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L511" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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register_with_docket(self, docket: Docket) -> None
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```
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Register this tool with docket for background execution.
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FunctionTool registers the underlying function, which has the user's
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Depends parameters for docket to resolve.
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#### `add_to_docket` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L521" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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add_to_docket(self, docket: Docket, arguments: dict[str, Any], **kwargs: Any) -> Execution
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```
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Schedule this tool for background execution via docket.
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FunctionTool splats the arguments dict since .fn expects **kwargs.
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**Args:**
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- `docket`: The Docket instance
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- `arguments`: Tool arguments
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- `fn_key`: Function lookup key in Docket registry (defaults to self.key)
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- `task_key`: Redis storage key for the result
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- `**kwargs`: Additional kwargs passed to docket.add()
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### `ParsedFunction` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L563" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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**Methods:**
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#### `from_function` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L571" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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from_function(cls, fn: Callable[..., Any], exclude_args: list[str] | None = None, validate: bool = True, wrap_non_object_output_schema: bool = True) -> ParsedFunction
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```
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