---
title: messages
sidebarTitle: messages
---

# `fastmcp.client.messages`

## Classes

### `MessageHandler` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L16" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>


This class is used to handle MCP messages sent to the client. It is used to handle all messages,
requests, notifications, and exceptions. Users can override any of the hooks


**Methods:**

#### `dispatch` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L30" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
dispatch(self, message: Message) -> None
```

#### `on_message` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L76" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_message(self, message: Message) -> None
```

#### `on_request` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L79" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_request(self, message: RequestResponder[mcp.types.ServerRequest, mcp.types.ClientResult]) -> None
```

#### `on_ping` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L84" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_ping(self, message: mcp.types.PingRequest) -> None
```

#### `on_list_roots` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L87" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_list_roots(self, message: mcp.types.ListRootsRequest) -> None
```

#### `on_create_message` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L90" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_create_message(self, message: mcp.types.CreateMessageRequest) -> None
```

#### `on_notification` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L93" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_notification(self, message: mcp.types.ServerNotification) -> None
```

#### `on_exception` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L96" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_exception(self, message: Exception) -> None
```

#### `on_progress` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L99" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_progress(self, message: mcp.types.ProgressNotification) -> None
```

#### `on_logging_message` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L102" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_logging_message(self, message: mcp.types.LoggingMessageNotification) -> None
```

#### `on_tool_list_changed` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L107" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_tool_list_changed(self, message: mcp.types.ToolListChangedNotification) -> None
```

#### `on_resource_list_changed` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L112" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_resource_list_changed(self, message: mcp.types.ResourceListChangedNotification) -> None
```

#### `on_prompt_list_changed` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L117" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_prompt_list_changed(self, message: mcp.types.PromptListChangedNotification) -> None
```

#### `on_resource_updated` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L122" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_resource_updated(self, message: mcp.types.ResourceUpdatedNotification) -> None
```

#### `on_cancelled` <sup><a href="https://github.com/PrefectHQ/fastmcp/blob/main/src/fastmcp/client/messages.py#L127" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>

```python
on_cancelled(self, message: mcp.types.CancelledNotification) -> None
```
