Underhood
Five free Claude skills for modding games you own: recon, reverse engineering (.NET, IL2CPP, native, pak AES keys, unknown formats), building and testing the mod in game, local art via ComfyUI, and release.
- GitHub stars
- 0 (GitHub stars as of 2026-10-25)
- License
- MIT
- Last commit
- 2026/10/23
- By
- Bambeek
Listed from the author's README. GameSkill has not run this end to end yet. Agent support and install steps are as documented by the author.
Install
/plugin marketplace add Bambeek/underhood-skill
/plugin install underhood@underhoodPuts the uh CLI on PATH. For /underhood-dig, register REA once: npx -y rea-agents@latest setup --client claude_code
Commands are copied from the project's README. Check the repository before running anything on your machine.
What you get
- /underhood-recon: engine, anti-cheat verdict, loaders, saves; writes MODDING_PLAN.md
- /underhood-dig: reverse engineering for .NET, IL2CPP, Java, native, Electron, APKs, pak AES keys and unknown formats
- /underhood-forge: backups, loader code or hooks, in-game test scenes and capture
- /underhood-art: sprites, textures, 3D, SFX and voice from local ComfyUI models, fitted to the engine's files
- /underhood-ship: lint for leaked keys and decompiled code, packaging, showcase clip
- The uh CLI (scan, probe, kb search, backup, comfy, sprite fit, render3d) and playbooks for 15 engine families
Good fit
- Modding single-player games you own without knowing reverse engineering
- Token-lean sessions: 244 KB of playbooks stay on disk until a step needs one
Not for
- Games or apps you don't own, or online games with anti-cheat
- Agents other than Claude Code
Overview
Underhood gives Claude the reverse-engineering knowledge most modders never learned: what a pak AES key is, why a file has entropy 8.0, what an AOB signature is, how a proxy DLL loads code. It is split into five skills that follow a mod from recon to release, plus a uh CLI that does the mechanical work, such as fingerprinting an install, probing a file's magic and entropy, or fitting a sprite to the exact size the engine expects.
The art skill uses local ComfyUI models, so the whole flow needs no paid service. Shared rules, a state file and a field-note knowledge base let the next session pick up where the last stopped.
Use it only on games and apps you own; anti-cheat is checked during recon.
Related
- Universal Modder is another agent skill for game mods.
- BabelDub re-voices games you own into another language.
Requirements
- Claude Code
- uv, or Python 3.10+ with Pillow, numpy and PyYAML
- Optional per task: Ghidra or IDA, ILSpy, Cpp2IL, FModel, ComfyUI, Blender, ffmpeg
Topics
FAQ
Works well with
Skills the author points to as related or as the better fit for neighbouring tasks.
Universal Modder
Skills, tools and a fal MCP that let Claude Code mod PC games you own: recon, reverse engineering, generated assets, in-game testing.
BabelDub
Agent skills that translate and re-voice a game you own in each character's original voice, using local models (VoxCPM2 + RVC), then repack FMOD banks or loose audio natively with backup and rollback.
Similar skills
open-game-skills
An MIT pack of about 190 SKILL.md agent skills for game design: combat feel, camera, traversal, world, validation, 2D/Spine and art pipeline, with a dispatcher and adapters for Three.js, PixiJS, Phaser, Cocos, Godot, Unity and Unreal.
sprite-gen
Generate clean 2D game sprites and animation atlases: state rows, alpha cleanup, frame extraction, runtime atlases.
Create Game Assets
Plan, generate, source, normalize, and validate cohesive visual game assets.
Dialogue Systems
Branching dialogue as a node graph with conditions, variables and localization hooks, using Ink, Yarn Spinner or a custom runner.