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title: tool
sidebarTitle: tool
---
# `fastmcp.tools.tool`
## Functions
### `default_serializer` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L34"><Icon icon="github" size="14" /></a></sup>
```python
default_serializer(data: Any) -> str
```
## Classes
### `Tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L38"><Icon icon="github" size="14" /></a></sup>
Internal tool registration info.
**Methods:**
#### `to_mcp_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L49"><Icon icon="github" size="14" /></a></sup>
```python
to_mcp_tool(self, **overrides: Any) -> MCPTool
```
#### `from_function` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L59"><Icon icon="github" size="14" /></a></sup>
```python
from_function(fn: Callable[..., Any], name: str | None = None, description: str | None = None, tags: set[str] | None = None, annotations: ToolAnnotations | None = None, exclude_args: list[str] | None = None, serializer: Callable[[Any], str] | None = None, enabled: bool | None = None) -> FunctionTool
```
Create a Tool from a function.
#### `from_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L86"><Icon icon="github" size="14" /></a></sup>
```python
from_tool(cls, tool: Tool, transform_fn: Callable[..., Any] | None = None, name: str | None = None, transform_args: dict[str, ArgTransform] | None = None, description: str | None = None, tags: set[str] | None = None, annotations: ToolAnnotations | None = None, serializer: Callable[[Any], str] | None = None, enabled: bool | None = None) -> TransformedTool
```
### `FunctionTool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L113"><Icon icon="github" size="14" /></a></sup>
**Methods:**
#### `from_function` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L117"><Icon icon="github" size="14" /></a></sup>
```python
from_function(cls, fn: Callable[..., Any], name: str | None = None, description: str | None = None, tags: set[str] | None = None, annotations: ToolAnnotations | None = None, exclude_args: list[str] | None = None, serializer: Callable[[Any], str] | None = None, enabled: bool | None = None) -> FunctionTool
```
Create a Tool from a function.
### `ParsedFunction` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L194"><Icon icon="github" size="14" /></a></sup>
**Methods:**
#### `from_function` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool.py#L201"><Icon icon="github" size="14" /></a></sup>
```python
from_function(cls, fn: Callable[..., Any], exclude_args: list[str] | None = None, validate: bool = True) -> ParsedFunction
```
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