Enum McpRequest 

#[non_exhaustive]
pub enum McpRequest {
    Initialize(InitializeParams),
    ListTools(ListToolsParams),
    CallTool(CallToolParams),
    ListResources(ListResourcesParams),
    ListResourceTemplates(ListResourceTemplatesParams),
    ReadResource(ReadResourceParams),
    SubscribeResource(SubscribeResourceParams),
    UnsubscribeResource(UnsubscribeResourceParams),
    ListPrompts(ListPromptsParams),
    GetPrompt(GetPromptParams),
    GetTaskInfo(GetTaskInfoParams),
    UpdateTask(UpdateTaskParams),
    CancelTask(CancelTaskParams),
    Ping,
    SetLoggingLevel(SetLogLevelParams),
    Complete(CompleteParams),
    Discover(DiscoverParams),
    SubscriptionsListen(SubscriptionsListenParams),
    Unknown {
        method: String,
        params: Option<Value>,
    },
}

High-level MCP request (parsed from JSON-RPC)

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Initialize(InitializeParams)

Initialize session

ListTools(ListToolsParams)

List available tools

CallTool(CallToolParams)

Call a tool

ListResources(ListResourcesParams)

List available resources

ListResourceTemplates(ListResourceTemplatesParams)

List resource templates

ReadResource(ReadResourceParams)

Read a resource

SubscribeResource(SubscribeResourceParams)

Subscribe to resource updates

UnsubscribeResource(UnsubscribeResourceParams)

Unsubscribe from resource updates

ListPrompts(ListPromptsParams)

List available prompts

GetPrompt(GetPromptParams)

Get a prompt

GetTaskInfo(GetTaskInfoParams)

Get task info (tasks/get).

UpdateTask(UpdateTaskParams)

Update an in-flight task with inputResponses (tasks/update).

Introduced by SEP-2663 to replace the blocking tasks/result method from the 2025-11-25 experimental spec. The response is an empty ack; task state is observed via tasks/get.

CancelTask(CancelTaskParams)

Cancel a task (tasks/cancel).

Ping

Ping (keepalive)

SetLoggingLevel(SetLogLevelParams)

Set logging level

Complete(CompleteParams)

Request completion suggestions

Discover(DiscoverParams)

SEP-2575: discover server capabilities without an initialize handshake

SubscriptionsListen(SubscriptionsListenParams)

SEP-2575 / SEP-2567: open a server-to-client notification stream (subscriptions/listen).

The HTTP transport intercepts this before it reaches the router and returns an SSE stream. The variant is defined here for client-side type-safe construction and for any future transport implementations.

Unknown

Unknown method

Fields

method: String

Unrecognized JSON-RPC method name.

params: Option<Value>

Raw parameters, if the request supplied them.

Implementations

impl McpRequest

pub fn method_name(&self) -> &str

Get the method name for this request

impl McpRequest

pub fn from_jsonrpc(req: &JsonRpcRequest) -> Result<McpRequest, Error>

Parse from JSON-RPC request

Trait Implementations

impl Clone for McpRequest

fn clone(&self) -> McpRequest

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for McpRequest

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

Formats the value using the given formatter.