MCP Helmet

Production middleware toolkit for building MCP servers, adding authentication, health checks, rate limiting, and graceful shutdown to MCP applications.

MCP Helmet is a composable middleware layer wrapping the official Model Context Protocol SDK with production-ready features. It provides auto transport detection for stdio and HTTP, built-in auth middleware for bearer tokens and API keys, health checks, graceful shutdown, rate limiting, request logging, and a CLI scaffolder for new projects. Available as the npm package mcp-helmet.