Module protocol

MCP Protocol types and JSON-RPC 2.0 implementation

This module implements the core Model Context Protocol types according to the specification. All message types follow JSON-RPC 2.0 format as required by MCP.

Structs

CancellationParams

Cancellation notification parameters

CancellationToken

Cancellation token for request cancellation

ClientCapabilities

Client capabilities

ClientInfo

Client information

ClientOptimizations

Client-specific optimization settings

InitializeParams

MCP Initialize request parameters

InitializeResult

MCP Initialize response

JsonRpcError

JSON-RPC 2.0 Error object

JsonRpcNotification

JSON-RPC 2.0 Notification message (no response expected)

JsonRpcRequest

JSON-RPC 2.0 Request message

JsonRpcResponse

JSON-RPC 2.0 Response message

SamplingCapability

Sampling capability

ServerCapabilities

Server capabilities

ServerInfo

Server information

VersionNegotiation

Protocol version negotiation result

Enums

CancellationError

Cancellation error types

ClientType

Client types we can detect and optimize for

CompatibilityLevel

Compatibility level between client and server

Constants

DEFAULT_PROTOCOL_VERSION

Current default protocol version

SUPPORTED_PROTOCOL_VERSIONS

Supported MCP protocol versions