The MCP MongoDB Server is a Model Context Protocol server that enables LLMs to interact with MongoDB databases through a unified interface. It supports inspecting collection schemas and executing a broad set of MongoDB operations, with safe defaults and optional read-only mode. Key features include Smart ObjectId handling with objectIdMode (auto, none, or force); flexible configuration via environment variables (MCP_MONGODB_URI, MCP_MONGODB_READONLY) and CLI options (--read-only); and protection of write operations in read-only mode. It uses MongoDB's secondary read preference to optimize performance when reading. Available operations cover: query (with optional execution plan analysis), aggregate pipelines, and count; and write operations such as update, insert, and createIndex (only when not in read-only mode). LLM integration features include collection completions, schema inference, and collection analysis, which help improve context understanding and interaction. The server includes debugging support via the MCP Inspector, and integrates with Claude Desktop, Windsurf, and Cursor through various configuration approaches (command-line, environment variables, or GitHub package usage). It can be installed globally or developed locally, with scripts for building and auto-reload during development. The README provides examples for usage and deployment.