Build World plugin
Build World builds interactive 3D worlds in Three.js, Roblox, Unity and Unreal: the agent writes logic, Thrixel makes assets.
- 115 ★ on the repository
- Last commit
- Apache-2.0
Extended access
Why this level
- The plugin connects an external service to your account, so requests and game descriptions go to Thrixel.
- Generation spends paid plan cubes.
Install
- Works in
In your terminal, with SkillFoxx CLI
npx skillfoxx add plugins/build-worldDetects the agents on your machine, shows the access level and pins the version.
Other ways to install
Access and checks
How we reviewExtended accessThe tool runs code or makes network calls and only reads external data.
- The plugin connects an external service to your account, so requests and game descriptions go to Thrixel.
- Generation spends paid plan cubes.
This is third-party code. Review the repository files before installing.
What it does
A Claude Code plugin from the Thrixel service. One plugin carries the `build-world` skill and the MCP connector: the agent handles logic, interactions and scene setup while Thrixel generates and stores 3D assets. A game or simulation can start from one `/thrixel:build-world` request with a description and an engine name, then be refined with follow-ups. Work follows a gauntlet-loop style cycle: the agent builds the world, evaluates it and improves gameplay and assets. Three.js, Roblox, Unity and Unreal Engine are supported. The project was previously called Goal to Game, and its scope is wider than games: educational scenes, virtual tours, AR and VR.
Who it is for. Developers of games and interactive 3D scenes who want to hand assets to an external generator and leave code and world assembly to the agent.
Good fit when
- You need a Three.js game prototype from a single description.
- A Unity or Unreal scene needs generated 3D models.
- You want an educational or historical 3D recreation in a browser.
- The agent should request assets in parallel while it writes logic.
Not a fit when
- You cannot sign up for Thrixel and send it requests.
- You only want your own assets with no generation.
- Service subscriptions and limits do not suit you.
Example request
/thrixel:build-world build a submarine exploration game in three.js set in a bright tropical sea with coral and fish.Limitations
Assets come from a paid external service: the free Starter plan gives a limited number of cubes, and a full game usually exceeds the limits. Sign in with `uvx thrixel-mcp@latest login` in a browser, which needs `uv`. The authors recommend a strong model at high reasoning effort. The Claude Code route is the main one, and Codex and Gemini CLI install differently. Plugin updates are off by default and are enabled in the `/plugin` menu.
How to disable. Remove the plugin with `claude plugin uninstall thrixel@thrixel` and the connector with `claude mcp remove thrixel` if installed by hand. Also delete the `~/.claude/skills/thrixel` and `build-world` folders.
FAQ
How do I install Build World?
Run `uvx thrixel-mcp@latest login`, then `claude plugin marketplace add thrixel/build-world` and `claude plugin install thrixel@thrixel`. The plugin installs skill and connector together.
How do I start building a game?
In Claude Code start the line with `/thrixel:build-world`, then describe the game and name the engine.
Which engines are supported?
Three.js, Roblox, Unity and Unreal Engine.
What about an old install?
Remove it: `claude mcp remove thrixel` and the `~/.claude/skills/build-world`, `goal-to-game` and `thrixel` folders, otherwise you get a duplicate.
Is it free?
The plugin is free, while asset generation follows Thrixel plans. The Starter plan includes a limited number of cubes.
Discussion
No questions or reviews yet.
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README in short
The README walks through three steps: installing Claude Code and `uv`, adding the plugin and the first request. It also has a manual route without the plugin and sections on parallel jobs and plans.