Universal Modder

Skills, tools, and a fal MCP that let Claude Code — or any coding agent — reverse-engineer, mod, and in-game-test almost any PC game you own.

Why it matters

What you could build with it

Does it hold up?

Demonstrably works: the repo's own knowledge base lists a dozen-plus working mods built by Claude Code in the first week (a Terraria boss-beating RL agent, a GTA V/Minecraft passthrough). Caveat: redistributing mods can trip game EULAs, so personal use is the safe scope.

Built with Universal Modder

• Agent-built mod log: field notes from shipped game modsGitHub · Field notes written by agents, for agents: working mods for Terraria, GTA V, Elden Ring, Halo 3, and Age of Empires II, each dated with the engine and modding route used.
• subagentic.ai X Post Facto: pointing Claude Code at gamessubagentic.ai · Weekly AI roundup covering the launch: skills plus tools that let Claude Code mod almost any owned PC game, with in-game testing.
• Vibecodes review: Universal Moddervibecodes.net · Independent pros/cons review covering the full modding loop end to end, flagging EULA and anti-cheat caveats for redistributing reverse-engineered content.
• igorhasse/universal-moddergithub · Community fork created on launch day — early sign of forking and adaptation interest.

Learn more

in-depth article →

First spotted on github: source.

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