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107 lines
4.7 KiB
Text
107 lines
4.7 KiB
Text
---
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title: messages
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sidebarTitle: messages
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---
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# `fastmcp.client.messages`
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## Classes
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### `MessageHandler` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L16" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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This class is used to handle MCP messages sent to the client. It is used to handle all messages,
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requests, notifications, and exceptions. Users can override any of the hooks
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**Methods:**
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#### `dispatch` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L30" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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dispatch(self, message: Message) -> None
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```
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#### `on_message` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L74" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_message(self, message: Message) -> None
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```
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#### `on_request` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L77" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_request(self, message: RequestResponder[mcp.types.ServerRequest, mcp.types.ClientResult]) -> None
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```
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#### `on_ping` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L82" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_ping(self, message: mcp.types.PingRequest) -> None
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```
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#### `on_list_roots` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L85" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_list_roots(self, message: mcp.types.ListRootsRequest) -> None
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```
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#### `on_create_message` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L88" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_create_message(self, message: mcp.types.CreateMessageRequest) -> None
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```
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#### `on_notification` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L91" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_notification(self, message: mcp.types.ServerNotification) -> None
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```
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#### `on_exception` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L94" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_exception(self, message: Exception) -> None
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```
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#### `on_progress` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L97" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_progress(self, message: mcp.types.ProgressNotification) -> None
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```
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#### `on_logging_message` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L100" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_logging_message(self, message: mcp.types.LoggingMessageNotification) -> None
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```
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#### `on_tool_list_changed` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L105" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_tool_list_changed(self, message: mcp.types.ToolListChangedNotification) -> None
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```
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#### `on_resource_list_changed` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L110" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_resource_list_changed(self, message: mcp.types.ResourceListChangedNotification) -> None
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```
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#### `on_prompt_list_changed` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L115" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_prompt_list_changed(self, message: mcp.types.PromptListChangedNotification) -> None
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```
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#### `on_resource_updated` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L120" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_resource_updated(self, message: mcp.types.ResourceUpdatedNotification) -> None
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```
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#### `on_cancelled` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/client/messages.py#L125" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
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```python
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on_cancelled(self, message: mcp.types.CancelledNotification) -> None
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```
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