anatomy

Anatomy is an Agent Skill written for Claude Code that also loads in Antigravity, OpenCode, Codex and MiniMax Code. You ask for a figure that explains a technical idea, and the skill has the agent invent a physical object whose working is the concept: the README's examples turn a cache key into a pin-tumbler lock and a shared GPU context into a gantry plotter.

The agent then builds that object from dozens of shaded isometric parts with a bundled drawing kit, places it in a card with a title and a live readout, and adds calm pointer and keyboard motion. Output is a standalone HTML page, a single SVG with embedded styles, or React/Next.js components. A WebGL layer handles effects like exhaust, water and lamp light, and a 3D mode for parts that really rotate is marked beta.

It checks its own work: an audit proves no part passes through another and every end sits on a mount, and scripts take headless Chrome screenshots and close-ups that the agent is told to inspect. That makes it slow by design; the README says a full 3D orbit audit takes 15 to 20 minutes for 30 parts. It needs Node 20.10+ and Chrome or Chromium for the checks, with no other dependencies or API keys.