MCP Unity Editor is an implementation of the Model Context Protocol for Unity Editor, providing a bridge between Unity and a Node.js server that implements the MCP protocol. It enables AI assistants to interact with Unity projects by exposing a set of tools to manipulate Scenes and GameObjects, run tests, manage packages, log console output, and create assets or prefabs. The server runs a WebSocket server inside Unity and a separate Node.js MCP client that routes commands to Unity. Tools available include execute_menu_item, select_gameobject, update_gameobject, update_component, add_package, run_tests, send_console_log, add_asset_to_scene, create_prefab, and recompile_scripts. It also provides resources, such as unity://menu-items, unity://scenes-hierarchy, unity://gameobject/{id}, unity://logs, unity://packages, unity://assets, and unity://tests/{testMode}. The project supports integration with IDEs like VSCode, Windsurf, Cursor, and Claude Desktop; port and timeout configuration, remote connections, and debugging with MCP Inspector. The project is MIT-licensed, open-source, and designed to be extensible with custom tools in both Unity and Node.js.