An open-source toolkit called universal-modder gives Claude Code a set of skills and tools to modify PC games, from reconnaissance and reverse engineering to AI-generated art and in-game testing, according to its GitHub repository.
The project packages 12 skills covering game engine detection, reverse engineering through tools like Ghidra and Cheat Engine, asset generation through the fal MCP server, and a Python CLI with more than 40 commands for scanning, asset pipelines and video capture, the repository says. It follows a 10-step loop: search a knowledge base, reconnoiter the game, build a prototype, generate assets, verify changes in-game, then record and document the result for future agent runs.
The repository ships three complete example mods: a Terraria weapon pack, a new Age of Empires II civilization, and Minecraft content integrated into GTA V's story mode, according to the project. It has drawn more than 6,500 stars and is released under the MIT license.
Game modding has always required a human who already knows the engine, the file formats and the toolchain. Packaging that domain knowledge as agent skills instead of a wiki page is a template other reverse-engineering and asset-heavy hobbies could copy directly.