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FastRMCP is a Rust-first Model Context Protocol (MCP) framework inspired by Python’s fastmcp, with a type-safe, macro-driven API to build servers quickly.

Why FastRMCP

• Rust-first ergonomics: fastrmcp::prelude::* + #[tool], #[resource], #[prompt] macros
• Production-ready transports: STDIO, SSE, WebSocket (HTTP/1.1 + HTTP/2)
• Batteries included: registry auto-registration, state, lifecycle hooks, middleware, subscriptions
• Zero-cost abstractions: async Tokio runtime, serde-based schemas, compile-time checks
• CLI scaffolding: fastrmcp new <name> with templates for stdio, SSE, WebSocket, middleware, subscriptions, complete

Key Features

• Tools, resources (with URI templates), and prompts auto-registered via inventory
• Context with logging, progress notifications, client/server metadata injection
• State container for typed shared data
• Built-in middleware (logging, auth, rate limit) + custom middleware trait
• Resource subscriptions and server-driven notifications
• Web transport helpers with connectionId handling for SSE/WS clients

Quick Links

• Getting Started — install, first tool/resource/prompt, run over STDIO
• Tools, Resources, Prompts — macro usage, schemas, return types
• Transports Guide — STDIO, SSE, WebSocket, connectionId tips
• Middleware Cookbook — built-ins and custom middleware patterns
• Subscriptions & Notifications — subscribe/unsubscribe + server updates
• Examples — walkthroughs of every example project
• CLI docs: fastrmcp-cli/README.md in the repo
• Main README: README.md in the repo

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