rust-mcp-stack/rust-mcp-sdk

cargo add rust-mcp-sdk

Usage

• •Define tools with the mcp_tool macro and implement a ServerHandler to build an MCP server
• •Use create_axum_server or create_actix_server for Streamable HTTP with multi-client concurrency

Key features

• ✓Implements MCP protocol 2025-11-25 and passes 100% of official conformance tests
• ✓Transports: stdio, Streamable HTTP, and backward-compatible SSE
• ✓Framework agnostic with native Axum and Actix backends plus BYO-server mounting
• ✓OAuth authentication for servers (Keycloak, WorkOS, Scalekit) and clients (DCR, PKCE)
• ✓Procedural macros: mcp_tool, tool_box, mcp_elicit, mcp_resource, mcp_resource_template, mcp_icon
• ✓Message Observer for telemetry and monitoring, HTTP health checks, MCP Tasks, resumability, multi-client concurrency

Best for

Rust developers building production-grade MCP servers or clients

Caveats

• ⚠OAuthProxy for non-DCR providers is still in development - use RemoteAuthProvider
• ⚠Streamable HTTP should bind to localhost and use TLS/HTTPS for production