mbta-mcp

The server correctly utilizes environment variables for both the MBTA API Key and an optional MCP authentication key. Input validation for the 'get_worcester_departures' tool is robustly implemented using Zod schemas, mitigating common injection and data validation risks. Network requests to the external MBTA API are performed using `fetch` with controlled, parameterized inputs, preventing arbitrary code execution. The authentication mechanism for the MCP server itself (`MCP_API_KEY`) relies on a bearer token via the Authorization header; while optional, its implementation is standard when enabled. If the `MCP_API_KEY` is not set, the server allows anonymous access, which is a deployment configuration risk if not intended, but not a code vulnerability. No 'eval', direct command execution via user input, or obvious malicious patterns were found in the provided source code.