DEDUPEDAuthorization notice. universal-modder is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.
Who it is forHobbyist who just bought an older PC game and wants to know whether modding it is realistic
The problemYou cannot tell what engine a game uses or whether anyone has already worked out how to mod it.
The outcomeA MODDING_PLAN.md with engine, version, managed or native code, anti-cheat status, save folders and the best known route.
What you need first
- A coding agent such as Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot or OpenCode
- A PC game you own, run single-player or offline
- Git, Python 3.10+ and ffmpeg (uv recommended)
- A fal API key for generated art, 3D and audio (or a local ComfyUI server for images)
- Blender for 3D to sprite renders
- Windows games run natively or from WSL
Steps
- Install the plugin or the skills with
npx skills add https://github.com/rehan-remade/universal-modder. - Search prior art first with
um kb search "grand theft auto", swapping in your game's name. - Ask the agent to run the game-recon skill on your install folder.
- Read the generated MODDING_PLAN.md before deciding to build anything.
Prompt for your agent
Use universal-modder's game-recon skill on <path to game folder>. Tell me the engine, whether it is managed or native, any anti-cheat, and whether the knowledge base already has notes on it. Write the result to MODDING_PLAN.md.
Caveat. Recon output is the agent's reading of files on disk; confirm anti-cheat status yourself before launching an online game with any mod.
About universal-modder
Skills that let a coding agent mod almost any PC game you own. Part of this week's top 10 repos: ranked #7 on Repo Radar. View rehan-remade/universal-modder on GitHub.
More with universal-modder
- Turn a finished mod into a reusable field note Record the engine, route, versions and gotchas of your mod and open a pull request so the next agent starts ahead.
- Add a custom weapon or boss to a game you own Describe a new item or boss in plain words and have the agent build it, with art, and test it in the running game.
- Cut a showcase video of your finished mod Record the game window with only game audio, pick the best moments and edit a styled clip.
- Put one game's content inside another game Port characters, vehicles or mechanics from one game into a second, like Minecraft mobs in GTA V.
- Make sprites, 3D models and sound for a mod with fal Generate engine-ready sprites, 3D models, sound effects and music for a mod instead of drawing them by hand.
- Port an existing mod to a newer game version or loader Move a mod from an old Minecraft version or loader to a new one without behavior drifting.
- Reverse engineer an unknown game file format Have the agent decode a proprietary asset or save format and prove it with a round trip.
Disclaimer
Deduped lists open-source repositories that belong to other people. We do not own, maintain, audit, or vouch for any of them, and a repo appearing here is not an endorsement or a safety check. The use cases, steps, and prompts are written by AI and may be incomplete, outdated, or just wrong. Where a use case is marked "Seen in the wild", we link to public posts where someone described something similar, but we have not verified those posts and the use case itself is still our AI's own write-up. Use all of this at your own risk. Only run code, commands, or agents on systems and accounts you are authorized to use, and read the code and every command before you run it, especially anything that touches credentials, files, or the network. Nothing here is professional, security, legal, or financial advice. All trademarks and project names belong to their respective owners, and their use here does not imply affiliation. Content is provided as is, without warranties of any kind. Found a mistake, a safety problem, or something you want removed? Email [email protected] and we will look at it promptly. Full disclaimer page