Universal Modder

Universal Modder is an open-source repository of Agent Skills, a um command-line tool, MCP configuration for fal, and a shared knowledge base. It lets AI coding agents such as Claude Code, Codex, Gemini CLI, Cursor, VS Code/Copilot and OpenCode mod PC games the user owns. The main entry point is the "mod-any-game" skill, which runs a fixed loop: search the knowledge base, do recon and pick a route, set up a safe lab with backed-up saves, read the game's real code, build one working slice, generate assets, verify in the running game, record, package, and write a field note.\n\nAsset generation goes through fal (images, 3D, audio), via an API key or fal's OAuth MCP relay. Local ComfyUI is supported for images, and the separate paid services Sprixen and Voidless are optional for 2D sprites and animation. The knowledge/ folder holds field notes written by agents, covering working versions, routes, verification and gotchas for specific games. Example prompts include porting a vehicle between games and combining mechanics from two games.\n\nInstallation varies by agent (plugin marketplaces, Gemini extension, npx skills add, or a plain clone). It requires Git, Python 3.10+ and ffmpeg, plus Blender for 3D-to-sprite renders. Windows games can be driven natively or from WSL. A mod hub at universalmodder.com is announced as upcoming. Results depend on the agent and game used, and fal usage is billed separately.