Module types 

All MCP protocol types (requests, responses, and data structures). MCP Protocol Types Module

This module contains all the type definitions for the Model Context Protocol organized into focused submodules based on the MCP 2025-06-18 specification.

Module Organization

• crate::types::core - Core protocol types and utilities
• crate::types::domain - Validated domain types (Uri, MimeType, Base64String)
• crate::types::capabilities - Client/server capability negotiation
• crate::types::content - Message content types (text, image, audio, resources)
• crate::types::requests - Request/response/notification enums
• crate::types::initialization - Connection handshake types
• crate::types::tools - Tool calling and execution
• crate::types::prompts - Prompt templates
• crate::types::resources - Resource access and templates
• crate::types::logging - Logging and progress tracking
• crate::types::sampling - LLM sampling (MCP 2025-06-18)
• crate::types::elicitation - User input elicitation (MCP 2025-06-18)
• crate::types::roots - Filesystem boundaries (MCP 2025-06-18)
• crate::types::completion - Argument autocompletion
• crate::types::ping - Connection testing

Re-exports

pub use sampling::ModelHint;

pub use domain::Base64Error;

pub use domain::MimeTypeError;

pub use domain::UriError;

pub use capabilities::*;

pub use completion::*;

pub use content::*;

pub use core::*;

pub use elicitation::*;

pub use initialization::*;

pub use logging::*;

pub use ping::*;

pub use prompts::*;

pub use requests::*;

pub use resources::*;

pub use roots::*;

pub use sampling::*;

pub use tools::*;

Modules

capabilities

MCP capability negotiation types

completion

Argument autocompletion types

content

Message content types

core

Core protocol types and utilities

domain

Validated domain types

elicitation

User input elicitation types (MCP 2025-06-18)

initialization

Types for the MCP connection initialization and handshake process.

logging

Logging types

ping

Connection testing types

prompts

Prompt template types

requests

Request/response/notification routing types

resources

Resource access and template types

roots

Filesystem boundaries types (MCP 2025-06-18)

sampling

LLM sampling types (MCP 2025-06-18)

tools

Types for the MCP tool-calling system.