fastmcp.client.messages

Classes

MessageHandler ^{<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>}

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 ^{<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>}

dispatch(self, message: Message) -> None

on_message ^{<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>}

on_message(self, message: Message) -> None

on_request ^{<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>}

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

on_ping ^{<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>}

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

on_list_roots ^{<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>}

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

on_create_message ^{<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>}

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

on_notification ^{<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>}

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

on_exception ^{<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>}

on_exception(self, message: Exception) -> None

on_progress ^{<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>}

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

on_logging_message ^{<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>}

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

on_tool_list_changed ^{<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>}

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

on_resource_list_changed ^{<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>}

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

on_prompt_list_changed ^{<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>}

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

on_resource_updated ^{<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>}

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

on_cancelled ^{<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>}

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