The shortlist
Editor bridges let an agent act inside the engine rather than only editing script files: building scenes, running the project and reading its errors. The right one is simply the one for the engine you use.
14k stars · Open source · C#
The most-starred Unity bridge in the index, with 47 tool entry points for scenes, GameObjects, C# scripts, assets, tests and builds across Unity 2021.3 LTS to 6.x.
— Your setup can't run Python 3.10 or later with uv alongside Unity; the bridge depends on it.
5.8k stars · Open source · JavaScript
Launches the Godot editor, runs projects in debug mode and captures their output, giving an agent the feedback loop it needs to fix its own game code, plus scene editing tools.
29k stars · Open source · Python
For modelling rather than game logic: prompt-driven 3D modelling and scene editing in Blender through an addon and an MCP server run with uv.
— You can't install the Blender addon; the server controls Blender through it.
These bridges act on your open project, so commit or back up first: an agent can delete scenes and assets as easily as it creates them. Each needs its editor-side plugin or addon installed and the editor running, and none of them is made by the engine vendor.
