fastify-mcp

The codebase appears well-structured and follows good practices for a Fastify plugin. It correctly handles session management (add, remove, close events) and provides generic error responses for invalid requests, minimizing information leakage. There are no obvious signs of 'eval' usage, obfuscation, hardcoded secrets, or malicious patterns. The use of `reply.raw` is inherent to Fastify's low-level access and the underlying MCP SDK transport layer. The primary security consideration for deployment is the in-memory session management, which, while secure for single-node instances, would require a distributed session store for horizontally scaled applications to prevent state loss or unauthorized access across instances. This is a design choice inherent to how the MCP SDK handles sessions, not a vulnerability in the plugin itself.