Universal Modder is a free, MIT-licensed toolkit designed to empower AI coding agents—such as Claude Code, OpenAI Codex, Cursor, and Gemini CLI—to reverse-engineer and mod PC games. Rather than relying on guesswork, the framework provides structured workflows, CLI utilities, and game engine playbooks that allow agents to execute complex modding tasks safely and reliably.
Key Features
- 10-Step Modding Loop: Automates the complete modding lifecycle from engine recon, decompilation, and isolated sandbox setup to runtime testing and packaging.
- Agent Skills &
umCLI: Equips AI agents with 11 custom skills alongside a command-line tool for runtime game automation, process attachment, window capture, and input automation. - Asset Generation Pipeline: Integrates a fal MCP server to generate game-ready sprites, 3D models, textures, SFX, and music fitted directly to target engine requirements.
- Reverse Engineering Integration: Guides agents through real code inspection using tools like ILSpy, Ghidra, Cpp2IL, and Frida.
- Engine Playbooks & Knowledge Base: Features 12 engine playbooks covering Unity, Unreal Engine, Godot, Source, RE Engine, and .NET/XNA, coupled with community-maintained field notes spanning dozens of games.
- Safety-First Design: Enforces strict local single-player guidelines, automatic save backups, and refusal to bypass anti-cheat systems.
