Universal Modder FAQ: the questions people actually ask
These are the questions that come up in the community, on the repository, and in search — answered plainly. If you are brand new, the overview explains what the toolkit is; this page handles the edge cases.
Is Universal Modder free?
Yes. The upstream project is MIT-licensed, which covers the skills, the um CLI and the fal MCP server. Asset generation through the fal.ai API costs money per call, but it is optional and you can substitute a local ComfyUI server with um comfy. The guides on this site are free as well.
Is it safe to run on my machine?
The toolkit follows explicit safety rules: it backs up save folders before touching them, kills processes by PID instead of by name, and asks before driving your mouse and keyboard, installing loaders into game folders, or publishing anything. It never bypasses anti-cheat, DRM or ownership checks. As with any modding tool, work on games you can reinstall.
Is it a mod manager like Vortex or Mod Organizer 2?
No. There is no library view, no load-order management and no conflict resolution screen. It builds, tests and packages mods. When a game uses a loader such as tModLoader, Fabric or BepInEx, the agent builds against that loader, and you keep using the loader the way you always did.
Can it mod console games?
No. It works only with PC games installed locally, driven natively on Windows or from WSL. Console titles, handhelds and cloud-streamed games are outside the scope, and there is no plan to change that — the toolkit depends on reading and modifying the real game files on your disk.
Can it mod online multiplayer games?
It refuses to inject into online games with anti-cheat protection, refuses cheats against other players, and refuses anti-cheat or DRM bypasses. Single-player titles, offline modes, and servers you host yourself are the supported scope. If recon finds anti-cheat tied to an online mode, the session stops for that game.
Which coding agents are supported?
Claude Code, Codex, Gemini CLI, VS Code with Copilot, Cursor and OpenCode all install the same skills, MCP server and CLI through plugin, extension, marketplace or clone routes. Any other agent can use the skills-only install. The install guide lists the exact command for each.
Do I need to know how to code?
You do not need to write the mod yourself — the agent does that. But you should be comfortable running a few terminal commands, reading what the agent reports, and reviewing changes before they ship. The toolkit is built for people who can supervise a technical session, not for complete zero-touch automation.
Do I need a fal key or a powerful GPU?
Neither is required for a first session. Without a key, recon, code changes, in-game testing, packaging and field notes all work; only generated art and audio pause. If you want local generation instead of fal, um comfy talks to a ComfyUI server, which benefits from a gaming-grade GPU but does not require one.
Does it work on Linux or macOS?
The supported path is Windows, or Linux via WSL for Windows games. The um CLI itself is Python and runs elsewhere, and some native Linux games can be worked on directly, but the in-game automation and test tooling assume Windows or WSL for the typical case.
What happens if a session breaks my game?
That is what um backup is for. Snapshots are taken before edits, and restore puts the save folders back. Game installs are also not sacred: verifies and reinstalls fix most damage, which is why the docs recommend working on a title you can reinstall and never on a save file you cannot lose.
Can it make cheats for me?
No. The project has a public rule: it does not write cheats against other players, and it does not bypass anti-cheat. Debugging tools like Cheat Engine are used for reverse engineering game logic during mod development, not for gaining an unfair advantage in online play.
Still stuck? The upstream repository carries a Discord linked from its README, and the knowledge base at the first mod walkthrough shows the loop in practice.