---
title: tool_manager
sidebarTitle: tool_manager
---
# `fastmcp.tools.tool_manager`
## Classes
### `ToolManager`
Manages FastMCP tools.
**Methods:**
#### `has_tool`
```python
has_tool(self, key: str) -> bool
```
Check if a tool exists.
#### `get_tool`
```python
get_tool(self, key: str) -> Tool
```
Get tool by key.
#### `get_tools`
```python
get_tools(self) -> dict[str, Tool]
```
Gets the complete, unfiltered inventory of local tools.
#### `add_tool_from_fn`
```python
add_tool_from_fn(self, fn: Callable[..., Any], name: str | None = None, description: str | None = None, tags: set[str] | None = None, annotations: ToolAnnotations | None = None, serializer: Callable[[Any], str] | None = None, exclude_args: list[str] | None = None) -> Tool
```
Add a tool to the server.
#### `add_tool`
```python
add_tool(self, tool: Tool) -> Tool
```
Register a tool with the server.
#### `add_tool_transformation`
```python
add_tool_transformation(self, tool_name: str, transformation: ToolTransformConfig) -> None
```
Add a tool transformation.
#### `get_tool_transformation`
```python
get_tool_transformation(self, tool_name: str) -> ToolTransformConfig | None
```
Get a tool transformation.
#### `remove_tool_transformation`
```python
remove_tool_transformation(self, tool_name: str) -> None
```
Remove a tool transformation.
#### `remove_tool`
```python
remove_tool(self, key: str) -> None
```
Remove a tool from the server.
**Args:**
- `key`: The key of the tool to remove
**Raises:**
- `NotFoundError`: If the tool is not found
#### `call_tool`
```python
call_tool(self, key: str, arguments: dict[str, Any]) -> ToolResult
```
Internal API for servers: Finds and calls a tool, respecting the
filtered protocol path.