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title: tool
sidebarTitle: tool
---
# `fastmcp.tools.tool`
## Functions
### `default_serializer`
```python
default_serializer(data: Any) -> str
```
## Classes
### `Tool`
Internal tool registration info.
**Methods:**
#### `to_mcp_tool`
```python
to_mcp_tool(self, **overrides: Any) -> MCPTool
```
#### `from_function`
```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`
```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`
**Methods:**
#### `from_function`
```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`
**Methods:**
#### `from_function`
```python
from_function(cls, fn: Callable[..., Any], exclude_args: list[str] | None = None, validate: bool = True) -> ParsedFunction
```
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