Enum MessageFromServer

pub enum MessageFromServer {
    RequestFromServer(RequestFromServer),
    ResultFromServer(ResultFromServer),
    NotificationFromServer(NotificationFromServer),
    Error(RpcError),
}

An enum representing various types of messages that can be sent from an MCP Server. It provides a typed structure for the message payload while skipping internal details like requestId and protocol version, which are used solely by the transport layer and do not need to be exposed to the user.

Variants

RequestFromServer(RequestFromServer)

ResultFromServer(ResultFromServer)

NotificationFromServer(NotificationFromServer)

Error(RpcError)

Trait Implementations

impl Clone for MessageFromServer

fn clone(&self) -> MessageFromServer

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MessageFromServer

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl From<CallToolResult> for MessageFromServer

fn from(value: CallToolResult) -> MessageFromServer

Converts to this type from the input type.

impl From<CancelledNotification> for MessageFromServer

fn from(value: CancelledNotification) -> MessageFromServer

Converts to this type from the input type.

impl From<CompleteResult> for MessageFromServer

fn from(value: CompleteResult) -> MessageFromServer

Converts to this type from the input type.

impl From<CreateMessageRequest> for MessageFromServer

fn from(value: CreateMessageRequest) -> MessageFromServer

Converts to this type from the input type.

impl From<GetPromptResult> for MessageFromServer

fn from(value: GetPromptResult) -> MessageFromServer

Converts to this type from the input type.

impl From<InitializeResult> for MessageFromServer

fn from(value: InitializeResult) -> MessageFromServer

Converts to this type from the input type.

impl From<ListPromptsResult> for MessageFromServer

fn from(value: ListPromptsResult) -> MessageFromServer

Converts to this type from the input type.

impl From<ListResourceTemplatesResult> for MessageFromServer

fn from(value: ListResourceTemplatesResult) -> MessageFromServer

Converts to this type from the input type.

impl From<ListResourcesResult> for MessageFromServer

fn from(value: ListResourcesResult) -> MessageFromServer

Converts to this type from the input type.

impl From<ListRootsRequest> for MessageFromServer

fn from(value: ListRootsRequest) -> MessageFromServer

Converts to this type from the input type.

impl From<ListToolsResult> for MessageFromServer

fn from(value: ListToolsResult) -> MessageFromServer

Converts to this type from the input type.

impl From<LoggingMessageNotification> for MessageFromServer

fn from(value: LoggingMessageNotification) -> MessageFromServer

Converts to this type from the input type.

impl From<NotificationFromServer> for MessageFromServer

fn from(value: NotificationFromServer) -> MessageFromServer

Converts to this type from the input type.

impl From<PingRequest> for MessageFromServer

fn from(value: PingRequest) -> MessageFromServer

Converts to this type from the input type.

impl From<ProgressNotification> for MessageFromServer

fn from(value: ProgressNotification) -> MessageFromServer

Converts to this type from the input type.

impl From<PromptListChangedNotification> for MessageFromServer

fn from(value: PromptListChangedNotification) -> MessageFromServer

Converts to this type from the input type.

impl From<ReadResourceResult> for MessageFromServer

fn from(value: ReadResourceResult) -> MessageFromServer

Converts to this type from the input type.

impl From<RequestFromServer> for MessageFromServer

fn from(value: RequestFromServer) -> MessageFromServer

Converts to this type from the input type.

impl From<ResourceListChangedNotification> for MessageFromServer

fn from(value: ResourceListChangedNotification) -> MessageFromServer

Converts to this type from the input type.

impl From<ResourceUpdatedNotification> for MessageFromServer

fn from(value: ResourceUpdatedNotification) -> MessageFromServer

Converts to this type from the input type.

impl From<Result> for MessageFromServer

fn from(value: Result) -> MessageFromServer

Converts to this type from the input type.

impl From<ResultFromServer> for MessageFromServer

fn from(value: ResultFromServer) -> MessageFromServer

Converts to this type from the input type.

impl From<RpcError> for MessageFromServer

fn from(value: RpcError) -> MessageFromServer

Converts to this type from the input type.

impl From<ToolListChangedNotification> for MessageFromServer

fn from(value: ToolListChangedNotification) -> MessageFromServer

Converts to this type from the input type.

impl FromMessage<MessageFromServer> for ServerMessage

fn from_message( message: MessageFromServer, request_id: Option<RequestId>, ) -> Result<ServerMessage, RpcError>

impl McpDispatch<ClientMessage, MessageFromServer> for MessageDispatcher<ClientMessage>

fn send<'life0, 'async_trait>( &'life0 self, message: MessageFromServer, request_id: Option<RequestId>, request_timeout: Option<Duration>, ) -> Pin<Box<dyn Future<Output = Result<Option<ClientMessage>, TransportError>> + Send + 'async_trait>>

where 'life0: 'async_trait, MessageDispatcher<ClientMessage>: 'async_trait,

Sends a message from the server to the client and awaits a response if applicable.

Serializes the MessageFromServer to JSON, writes it to the transport, and waits for a ClientMessage response if the message is a request. Notifications and responses return Ok(None).

Arguments

• message - The server message to send.
• request_id - An optional request ID (used for responses/errors, None for requests).

Returns

A TransportResult containing Some(ClientMessage) for requests with a response, or None for notifications/responses, or an error if the operation fails.

Errors

Returns a TransportError if serialization, writing, or timeout occurs.

impl McpMessage for MessageFromServer

fn is_response(&self) -> bool

fn is_request(&self) -> bool

fn is_notification(&self) -> bool

fn is_error(&self) -> bool

fn message_type(&self) -> MessageTypes

impl Serialize for MessageFromServer

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.