docs/python-sdk/fastmcp-tools-tool_manager.mdx

---
title: tool_manager
sidebarTitle: tool_manager
---

# `fastmcp.tools.tool_manager`

## Classes

### `ToolManager` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L22"><Icon icon="github" size="14" /></a></sup>


Manages FastMCP tools.


**Methods:**

#### `mount` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L46"><Icon icon="github" size="14" /></a></sup>

```python
mount(self, server: MountedServer) -> None
```

Adds a mounted server as a source for tools.


#### `add_tool_from_fn` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L113"><Icon icon="github" size="14" /></a></sup>

```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` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L142"><Icon icon="github" size="14" /></a></sup>

```python
add_tool(self, tool: Tool) -> Tool
```

Register a tool with the server.


#### `remove_tool` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/tools/tool_manager.py#L159"><Icon icon="github" size="14" /></a></sup>

```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