melonJS AI Skills
Agent skills for the melonJS HTML5 game engine
- Best for
- People using Claude Code, Codex, Cursor or Gemini CLI to build 2D, 2.5D or 3D browser games on the melonJS engine
- Makes
- HTML5 browser games built on melonJS, in JavaScript or TypeScript
- Made by
- melonJS
- Where you use it
- CLI
- Engines
- melonJS, Web
- Pricing
- Free and open source (MIT); you use it with your own coding agent
- Free plan
- Yes
- Open source
- Yes (MIT)
- Export
- Games are standard melonJS web projects; the engine is MIT licensed with no runtime dependencies, according to its site
- Status
- Available
melonJS AI Skills is a set of instruction files for AI coding agents that ships inside melonJS, a free, MIT-licensed HTML5 game engine for 2D, 2.5D and 3D games in JavaScript or TypeScript. According to the engine's changelog, the skills arrived in version 20.3.0 on August 31, 2026, and they are versioned with the engine, so the copy in node_modules/melonjs/skills/ matches the release you install.
The 20.13.0 release (November 6, 2026) contains 25 SKILL.md guides, which we counted in the repo and npm package: a melonjs router that points the agent to the right topic, plus guides on physics, tilemaps, sprites, 3D scenes, lighting, shaders, audio, input, UI, performance, deployment and moving to version 20. The changelog says each guide ends with a table matching symptoms to causes for bugs that fail silently instead of throwing an error. The melonJS homepage still says 23 skills, the count at launch.
Claude Code users add the repo as a plugin marketplace. Other agents can use the npx skills installer, or copy the bundled AGENTS.md file into the project, which the site says works for Codex, Cursor and Gemini CLI. The project also publishes an llms.txt index of the full API for agents.
The melonJS site describes the engine as about 250 KB minzipped with no dependencies, rendering on WebGPU, WebGL 2 or Canvas with automatic fallback. AIGamer hasn't tested the skills. The GitHub repo had about 6,500 stars as of November 11, 2026.
Limitation: Tied to the melonJS engine and HTML5 output, so it does not help with Unity, Godot or Unreal projects
FAQ
Is melonJS free?
Yes. The melonJS engine and its bundled AI skills are released under the MIT license. You still need your own coding agent, such as Claude Code, Codex or Cursor, which is billed separately.
How do I add the melonJS skills to Claude Code?
Run /plugin marketplace add melonjs/melonJS in Claude Code. The repo's marketplace lists one plugin, named melonjs, which registers the 25 guides.
Do the melonJS skills work with Codex, Cursor or Gemini CLI?
The melonJS site says agents that follow the AGENTS.md convention can read the AGENTS.md file that ships in node_modules/melonjs/skills/; copy it to your project root. The site also gives an npx skills add command that installs the skills for other agents.
How many skills does melonJS ship?
Version 20.13.0 (November 6, 2026) ships 25 SKILL.md guides, including a router skill. The first release with skills, 20.3.0 on August 31, 2026, had 23 topic guides, and the homepage still shows that number.
Sources
Compiled by AIGamer from melonJS AI Skills's own pages and the sources below, checked 11 November 2026. We haven't tested melonJS AI Skills hands-on.
- melonJS: Official site, including the AI Skills section
- melonJS: GitHub repository (README and repo data)
- melonJS: Skills folder in the engine package
- melonJS: Claude Code plugin manifest (plugin.json, 20.13.0)
- melonJS: Changelog
- melonJS: Release 20.3.0 on GitHub
- melonJS: Release 20.13.0 on GitHub
- melonJS: API index for agents (llms.txt)
- npm: melonjs package
- DEXTUNE (@dextune): Post on X about melonJS (where we spotted it)
Image: melonJS (GitHub)
Written in our own words; quotes are marked and credited. How we report
