universal-modder
by rehan-remade
Point Claude at any game. Skills, tools and the fal MCP that let Claude Code mod almost any PC game you own: recon, reverse engineering, fal-generated art/3D/audio, in-game testing, showcase videos.
9,675stars
1,082forks
Python
Added 9/30/2026
From $49 · 30 days · terms & refunds
⚠️ Third-Party Software Notice
This skill is third-party open-source software developed and hosted independently on GitHub. SkillsLLM is an informational directory and does not control or maintain the underlying repository.
Any security checks, ratings, or warnings displayed by SkillsLLM are automated and limited in scope. They do not constitute a security certification or guarantee that the software is safe, error-free, or free from malicious code, vulnerabilities, compromised dependencies, or prompt-injection risks.
Review the source code, permissions, dependencies, and configuration before installing or running any third-party skill. Use is at your own risk. To the maximum extent permitted by applicable law, SkillsLLM is not liable for losses arising from third-party software.
MCP Serversage-of-empiresclaude-codeclaude-code-pluginfalgame-assetsgame-moddingmcpmoddingreverse-engineeringtmodloader
Maintainer of this skill?
Automated security scan — not a certification.
Installation
# Add to your Claude Code skills
git clone https://github.com/rehan-remade/universal-modderGetting Started
Guides for using mcp servers skills like universal-modder.
- Best MCP Servers in 2026Category-by-category picks: databases, dev tools, productivity, browser automation.
- What is an AI Skills Marketplace?Definitions, how marketplaces work, and how to choose between them in 2026.
- Getting Started with AI SkillsFirst-time install walkthrough for Claude Code, Codex CLI, and ChatGPT.
Security ReportVerified
Last scanned: 10/1/2026
{
"issues": [],
"status": "PASSED",
"scannedAt": "2026-10-01T10:44:18.819Z",
"npmAuditRan": true,
"pipAuditRan": true,
"promptInjectionRan": true
}Compare with similar skills
See how universal-modder compares with popular alternatives.
Install
Pick your agent. Each gets the same skills (Agent Skills format), the fal MCP server, and the um CLI.
| Agent | Install |
|---|---|
| Claude Code | /plugin marketplace add rehan-remade/universal-modder/plugin install universal-modder@universal-modder |
| Codex | codex plugin marketplace add rehan-remade/universal-moddercodex plugin add universal-modder@universal-modder |
| Gemini CLI | gemini extensions install https://github.com/rehan-remade/universal-modder |
| VS Code / Copilot | Enable chat.plugins.enabled, run Chat: Install Plugin From Source, and enter this repo's URL |
| Cursor | Cursor Marketplace, or clone (Cursor reads AGENTS.md and .cursor/mcp.json) |
| OpenCode | Clone and run opencode inside it (opencode.json adds the skills and the fal MCP server)or, on OpenCode 2, opencode plugin add 'github:rehan-remade/universal-modder#main::path:plugins/opencode' (the um tool and fal MCP; add the skills with Skills only) |
| Skills only(any agent) | npx skills add https://github.com/rehan-remade/universal-modder |
| Anything else | git clone https://github.com/rehan-remade/universal-modder and start your agent inside it |
Inside a clone, each agent finds the skills where it looks for them: .agents/skills (Codex, Gemini CLI,
Copilot, Cursor, OpenCode) and .claude/skills (Claude Code) are copies of skills/. Instructions are in
AGENTS.md, which CLAUDE.md and GEMINI.md point to. MCP config is in .mcp.json, .codex/config.toml,
.cursor/mcp.json, .vscode/mcp.json and opencode.json (which also points OpenCode at skills/).
Without a clone, OpenCode 2 installs the plugin in plugins/opencode/ with opencode plugin add: one
um_run tool that passes its arguments straight to the CLI and runs um from PATH (see below), plus the
fal MCP server when FAL_KEY is set and none is configured. A clone doesn't need it. See
plugins/opencode/README.md.
The um CLI. The Claude Code plugin puts it on PATH (its SessionStart hook), and so does a clone opened in
Claude Code (.claude/settings.json); in a clone with another agent, export PATH="$PWD/bin:$PATH". Other
agents' plugin installs (Codex, Cursor, Gemini CLI, OpenCode) don't, so install it once:
uv tool install git+https://github.com/rehan-remade/universal-modder # or: pipx install git+...
For assets, get a fal API key. It powers both the fal MCP server and
um fal. Rather than exporting it from a shell profile or a .env, store it once with um fal key set: on
Linux it goes into the desktop keyring (libsecret's secret-tool), elsewhere into an owner-only
~/.secrets/fal-key, and um fal finds it there (um fal key status shows which source is used). FAL_KEY
in the environment still works and wins. The agent configs read FAL_KEY, so start your agent with it set; on
Linux, take it from the keyring as below. With no key, fal's OAuth endpoint https://mcp.fal.ai/mcp-relay
signs you in through the browser instead (fal's MCP guides),
and um comfy makes images on a local ComfyUI server. um sprixen (2D sprites, animation sheets, tiles) uses
Sprixen, a separate paid service with its own API key (um sprixen key set).
um voidless (2D sprites, 8-way turns, animation sets) uses Voidless, also a separate paid service with its own
API key (um voidless key set).
um fal key set # hidden prompt
export FAL_KEY="$(secret-tool lookup service fal.ai key api)" # Linux: before starting the agent
You also need Git, Python 3.10+ and ffmpeg. uv is recommended. Blender is needed for 3D → sprite renders.
Windows games are driven natively or from WSL.
Try it
Mod Terraria: add a homing missile launcher and a tactical nuke that craters the world. Make the sprites with fal.
Make a new civilization for Age of Empires II with a unique unit rendered from 3D.
Put real Minecraft inside GTA V story mode. Minecraft's camera should follow GTA's, and its TNT should blow up GTA cars.
Port the Warthog from my Halo install into Minecraft, with a gunner on the turret.
What engine is
C:\Games\Foo, and has anyone modded it before?
The agent starts with the mod-any-game skill and runs the same loop every time:
- search the knowledge base;
- recon, then pick a route;
- set up a safe lab (saves backed up);
- read the actual code;
- build one working slice;
- generate assets;
- verify in the real game;
- record;
- package;
- write a field note for the next agent.
A knowledge base that AIs write for AIs
knowledge/ holds field notes: how specific games were actually modded, decompiled and
reverse-engineered. Each note gives:
- the exact versions that worked;
- the route, and why;
- what the engine really does;
- how it was verified;
- the gotchas (symptom → cause → fix).
Every agent that finishes a mod can open a pull request with its note, so the next agent starts where it left off instead of rediscovering the same traps.
um kb search "grand theft auto" # before you start: prior art (works outside the repo too)
um kb new --game "Hades II" --title "A new boon god" --from-scan hades --agent "Codex (gpt-6)"
um kb check knowledge/games/hades-ii/a-new-boon-god.md
um kb pr knowledge/games/hades-ii/a-new-boon-god.md --yes # after your human says OK: branch, push, PR
Browse knowledge/INDEX.md. Every game is welcome. Contribution rules, for humans and
AIs, are in CONTRIBUTING.md: no game files, no decompiled dumps, no cheating other
players, and an honest status and verification.
A few notes from the community:
- Portalcraft: real Minecraft inside Portal 2
- Halo 3 weapons, Covenant, vehicles and maps ported into Minecraft
- Bloons TD 6 inside Minecraft, with the game's rules as a headless sim
- A CS2-style conversion of Elden Ring offline, as a native Rust DLL
What's inside
Skills (skills/, Agent Skills format)
Frequently Asked Questions
What is universal-modder?
universal-modder is an open-source mcp servers skill for AI coding assistants such as Claude Code, Codex CLI, and ChatGPT, built by rehan-remade. Point Claude at any game. Skills, tools and the fal MCP that let Claude Code mod almost any PC game you own: recon, reverse engineering, fal-generated art/3D/audio, in-game testing, showcase videos. It has 9,675 GitHub stars.
Is universal-modder safe to use?
Yes. universal-modder passed SkillsLLM's automated security scan — a dependency vulnerability audit plus prompt-injection heuristics — with no high-severity issues. You can read the full report in the Security Report section on this page.
How do I install universal-modder?
Clone the repository with "git clone https://github.com/rehan-remade/universal-modder" and add it to your Claude Code skills directory (see the Installation section above).
What programming language is universal-modder written in?
universal-modder is primarily written in Python. It is open-source under rehan-remade on GitHub, so you can review or fork the full source.
Are there alternatives to universal-modder?
Yes. SkillsLLM lists many other MCP Servers skills you can browse and compare side by side. Open the MCP Servers category from the badge at the top of this page, or use the Related Skills and comparison links further down to weigh universal-modder against similar tools.
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