FastMCP Framework

FastMCP is an opinionated TypeScript framework for efficiently building Model Context Protocol (MCP) servers, currently stable at version 4.0.0. It aims to simplify the creation of MCP servers by abstracting away low-level implementation details, handling boilerplate, and providing intuitive, high-level APIs for common tasks like tool, resource, and prompt definition, authentication, and session management. The project maintains a rapid release cadence, often shipping minor versions every 3-4 weeks and immediately releasing patch versions for critical bug fixes and security updates, reflecting its commitment to staying current with the evolving MCP ecosystem. Key differentiators include built-in OAuth 2.1 authentication (with support for Google, GitHub, Azure, and custom providers), comprehensive session management, multiple transport options (HTTP streaming, SSE, stdio), edge runtime support, and custom HTTP route capabilities. It is designed for developers who want to quickly build robust MCP servers without delving into the intricacies of the underlying MCP SDK, on which it is built.