hanzo-mcp-types

Rust type definitions for the Model Context Protocol (MCP).

Overview

This crate provides strongly-typed Rust definitions for all MCP protocol messages, enabling type-safe communication between AI agents and tool servers.

Installation

[dependencies]
hanzo-mcp-types = "0.6"

Usage

use mcp_types::{
    CallToolRequest, CallToolResult, ListToolsRequest, ListToolsResult,
    Tool, ToolInfo, Content, TextContent,
};

// Define a tool
let tool = Tool {
    name: "read_file".to_string(),
    description: Some("Read contents of a file".to_string()),
    input_schema: serde_json::json!({
        "type": "object",
        "properties": {
            "path": {"type": "string"}
        },
        "required": ["path"]
    }),
};

// Create a tool call request
let request = CallToolRequest {
    name: "read_file".to_string(),
    arguments: Some(serde_json::json!({"path": "src/main.rs"})),
};

Key Types

Protocol Version

This crate implements MCP specification version 2025-06-18.

• TypeScript schema (source of truth): schema.ts
• JSON schema: schema.json

Related Crates

• hanzo-mcp-client - Async MCP client
• hanzo-protocol - Core protocol types
• hanzo-zap - Zero-copy Agent Protocol

License

MIT License - Copyright 2025 Hanzo AI Inc.