Module types 

Core protocol types for MCP.

This module contains all the type definitions for the Model Context Protocol, including requests, responses, notifications, and capability definitions.

Re-exports

pub use crate::shared::transport::TransportMessage;

pub use crate::DEFAULT_PROTOCOL_VERSION;

pub use crate::LATEST_PROTOCOL_VERSION;

pub use crate::SUPPORTED_PROTOCOL_VERSIONS;

pub use auth::AuthInfo;

pub use auth::AuthScheme;

pub use caching::CacheScope;

pub use caching::DEFAULT_TTL_MS;

pub use capabilities::ClientCapabilities;

pub use capabilities::ClientTasksCapability;

pub use capabilities::CompletionCapabilities;

pub use capabilities::ElicitationCapabilities;

pub use capabilities::FormElicitationCapability;

pub use capabilities::LoggingCapabilities;

pub use capabilities::PromptCapabilities;

pub use capabilities::ResourceCapabilities;

pub use capabilities::RootsCapabilities;

pub use capabilities::SamplingCapabilities;

pub use capabilities::ServerCapabilities;

pub use capabilities::ServerTasksCapability;

pub use capabilities::ToolCapabilities;

pub use elicitation::ElicitAction;

pub use elicitation::ElicitRequestParams;

pub use elicitation::ElicitResult;

pub use elicitation::ElicitationCompleteNotification;

pub use jsonrpc::JSONRPCError;

pub use jsonrpc::JSONRPCNotification;

pub use jsonrpc::JSONRPCRequest;

pub use jsonrpc::JSONRPCResponse;

pub use jsonrpc::RequestId;

pub use mrtr::InputRequest;

pub use mrtr::InputRequestKind;

pub use mrtr::InputRequests;

pub use mrtr::InputRequiredResult;

pub use mrtr::InputResponse;

pub use mrtr::InputResponses;

pub use mrtr::MrtrOutcome;

pub use mrtr::MrtrSignal;

pub use subscriptions::advertises_subscriptions;

pub use subscriptions::SubscriptionAcknowledgedParams;

pub use subscriptions::SubscriptionFilter;

pub use subscriptions::SubscriptionsListenParams;

pub use subscriptions::SubscriptionsListenResult;

pub use subscriptions::ACKNOWLEDGED_METHOD;

pub use subscriptions::SUBSCRIPTIONS_LISTEN_METHOD;

pub use subscriptions::SUBSCRIPTION_ID_META_KEY;

pub use ui::ToolUIMetadata;

pub use ui::UIMimeType;

pub use ui::UIResource;

pub use ui::UIResourceContents;

pub use mcp_apps::ChatGptToolMeta;mcp-apps

pub use mcp_apps::ExtendedUIMimeType;mcp-apps

pub use mcp_apps::HostType;mcp-apps

pub use mcp_apps::NotifyLevel;mcp-apps

pub use mcp_apps::RemoteDomFramework;mcp-apps

pub use mcp_apps::ToolVisibility;mcp-apps

pub use mcp_apps::UIAction;mcp-apps

pub use mcp_apps::UIContent;mcp-apps

pub use mcp_apps::UIDimensions;mcp-apps

pub use mcp_apps::UIMetadata;mcp-apps

pub use mcp_apps::WidgetCSP;mcp-apps

pub use mcp_apps::WidgetMeta;mcp-apps

pub use mcp_apps::WidgetResponseMeta;mcp-apps

pub use protocol::*;

Modules

auth

Authentication-related types for MCP.

caching

Client-side caching hints for the MCP 2026-07-28 CacheableResult base.

capabilities

Capability definitions for MCP clients and servers.

completable

Completable arguments support for MCP.

content

Content types for MCP protocol messages.

elicitation

Spec-compliant MCP elicitation types (2025-11-25).

jsonrpc

JSON-RPC 2.0 protocol types.

mcp_appsmcp-apps

MCP Apps Extension types for interactive UI support (ChatGPT Apps, MCP-UI) MCP Apps Extension types for interactive UI support.

mrtr

Multi-round-trip request (MRTR) wire types for MCP 2026-07-28.

notifications

Notification types for MCP protocol.

prompts

Prompt types for MCP protocol.

protocol

MCP protocol-specific types.

resources

Resource types for MCP protocol.

roots

Roots wire types (target-agnostic).

sampling

Sampling types for MCP protocol.

subscriptions

subscriptions/listen wire types (MCP 2026-07-28, HTTP-04).

tasks

MCP Task protocol types (2025-11-25).

tools

Tool types for MCP protocol.

ui

UI resources for MCP Apps Extension (SEP-1865)