Rust MCP SDK

What is Rust MCP SDK?

A high-performance, asynchronous Rust toolkit for building MCP servers and clients. It implements the latest MCP protocol version (2025-11-25) and passes 100% of official MCP conformance tests, letting developers focus on application logic while the SDK handles protocol, transports, and authentication.

How to use Rust MCP SDK?

Add rust-mcp-sdk = "0.9.0" to your Cargo.toml, then define tools using the mcp_tool macro and implement the ServerHandler trait. Quick-start examples show a minimal stdio server, a Streamable HTTP server with Axum or Actix backends, and a BYO-server mode for embedding MCP in existing apps.

Key features of Rust MCP SDK

• Implements MCP protocol 2025-11-25
• Passes 100% of official conformance tests (client and server)
• Supports Stdio, Streamable HTTP, and SSE transports
• Framework-agnostic: native Axum, Actix, and BYO-server integrations
• Multi-client concurrency and DNS rebinding protection
• OAuth authentication for servers and clients (multiple providers)

Use cases of Rust MCP SDK

• Build a minimal MCP server using standard input/output transport
• Deploy a Streamable HTTP MCP server with Axum or Actix for multi-client access
• Embed MCP endpoints into an existing web application via BYO-server mode
• Implement custom tools, resources, and templates with procedural macros
• Add OAuth-based authentication to MCP servers or clients