Gives Claude (and other AI assistants) full control over the Unity Editor through 62 tools spanning scene management, GameObject manipulation, asset operations, profiling, and runtime testing. Uses file-based IPC instead of WebSockets, so there's no port configuration or firewall drama, and it survives domain reloads cleanly. The real trick here is that you can write C# code, check compile errors via console-get-logs, enter Play Mode, invoke runtime methods, and validate game state without leaving your AI chat window. Works with Unity 2022.3+ and supports both Claude Code's Skill mode and standard MCP. If you're prototyping gameplay or debugging editor workflows with AI assistance, this turns your assistant into an actual Unity operator instead of just a file editor.