Rei — command Unreal Engine, by hand or by agent
Rei is a desktop launcher for Unreal Engine with a built-in MCP bridge — one window to launch, supervise, configure and author your projects, by hand or by agent.
Rei is a developer tool for game and real-time 3D development on Unreal Engine. It lets you manage engine versions and projects, launch and supervise the editor and packaged builds, edit configuration, and drive the editor programmatically through the Model Context Protocol (MCP).
Visit rei-tools.app to learn more.