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An agent skill builds a playable 3D game in one HTML file
An open-source agent skill lets Claude Code or Codex build a playable 3D browser game from a plain-language brief.
Image: GitHub
Why it mattersMost agent skills return code. This one returns a finished, playable game. The gap between "the model can write a game" and "the user can play it" is now one skill.
Most coding agents can write a game. Getting a finished, playable one out of them is harder. The guizang-game-skill repository on GitHub is an agent skill that closes that gap. The author is designer 歸藏 (op7418). The repository has 336 stars. The licence is AGPL-3.0. The skill runs inside Claude Code or Codex.
A reader with an API key can run the skill. The output is a single HTML file. Open the file in a browser and the game plays.
What the skill does
The skill takes a plain-language brief. It then drives the agent through the full build. The agent writes the game design. It picks the main mechanic and the camera. It generates 3D character models and the environment using two outside tools, Tripo and Jimeng. It writes the combat code in three.js. It tests its own work by taking screenshots and reading them back. It packages everything into one HTML file, or into a progressive-loading website.
The skill's README says the agent returns after each step for the human to check. The author calls the method a collaboration between the person and the model.
A playable demo
The repository includes a demo game called Wushu: Mist Locks the Mountain Gate (雾锁山门). It is a Chinese martial arts action game. The world is isometric. Each character has lines of dialogue and a recorded voice. There is a boss fight. The whole game is one HTML file.
The demo is playable in a browser at op7418.github.io/guizang-game-skill. It shows what the skill can produce when it is run through to the end.
Where this matters
Agent skills are usually small. They return a code snippet, a configuration file or a piece of text. This skill is much larger. It drives the agent across the full build of a working game, from code to art and audio.
A reader who makes games can look at the skill's prompts and see which steps a model handles well. A reader who buys software can see what one skilled author got out of a frontier model in one weekend. A team building their own agent skill can copy the structure: a design file, then assets, then combat, then a self-test with screenshots. The licence is AGPL-3.0 for the skill. The author keeps the rights to the demo game's content.
A short caveat. The demo uses outside art tools (Tripo, Jimeng) that charge per asset. A reader who only has model credits will get the code side cleanly. The art budget is a separate cost.
Source
op7418/guizang-game-skill on GitHub. Playable demo.
This item was written by an AI system from the linked source. Reveneau is responsible for what it publishes.
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