Polycss

What it does

When your agent uses it

• Asked to create
• Explain PolyCSS code in vanilla JavaScript

Example prompts

• “/polycss”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Winding decides visibility. Vertex order sets the normal by the
2. 2color is not a full CSS color. Only #rgb, #rrggbb, rgb(), and
3. 3Non-triangular polygons must be coplanar, or they are flattened onto
4. 4The optimizer rewrites geometry by default (merge: true,
5. 5Degenerate polygons vanish silently — under 3 vertices, zero area, or a

What it can do on your machine

Read from SKILL.md and the folder at commit 04a1b66. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript and html).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Hosts in commands or code, which the agent is likely to contact:

  • esm.sh

  Also links to:

  • polycss.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Polycss loads about 2.4k tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 809 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~55

When it runs · the whole SKILL.md, loaded when a task matches

~2.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from layoutit/polycss at commit 04a1b66, republished under its MIT licence (© layoutit). 809 words, ~2,401 tokens.

name

polycss

description

Build PolyCSS scenes that render 3D meshes, primitive shapes, or custom polygons as DOM/CSS polygon elements. Use when asked to create, port, debug, or explain PolyCSS code in vanilla JavaScript, React, or Vue.

import {
  createPolyCamera,
  createPolyPerspectiveCamera,
  createPolyScene,
  createPolyOrbitControls,
  createPolyBox,
  createPolyPlane,
  loadMesh,
} from "@layoutit/polycss";

import {
  PolyCamera,
  PolyPerspectiveCamera,
  PolyScene,
  PolyMesh,
  PolyGround,
  PolyOrbitControls,
  Poly,
} from "@layoutit/polycss-react"; // or "@layoutit/polycss-vue"

interface Polygon {
  vertices: [number, number, number][];  // 3+ points, CCW seen from outside
  color?: string;                        // hex or rgb()/rgba() ONLY
  texture?: string;                      // image URL
  uvs?: [number, number][];              // one per vertex
  material?: PolyMaterial;               // shared material; material.texture wins over `texture`
  data?: Record<string, string | number | boolean>;  // → data-* attributes
}

const camera = createPolyCamera({ rotX: 65, rotY: 45 });
const scene = createPolyScene(document.getElementById("host")!, {
  camera,
  textureLighting: "dynamic",
  directionalLight: { direction: [0.5, -0.6, 0.7], color: "#ffffff", intensity: 1 },
  ambientLight: { color: "#ffffff", intensity: 0.35 },
});

createPolyOrbitControls(scene, { drag: true, wheel: true });

scene.add(createPolyBox({ size: 100, color: "#ffd166" }), { position: [0, 0, 50] });
scene.add(await loadMesh("/model.glb"), { castShadow: true });
// Vanilla has no ground fallback — a caster needs an explicit receiver.
scene.add(createPolyPlane({ axis: 2, size: 60, offset: 0, color: "#7d848e" }), { receiveShadow: true });

<PolyCamera rotX={65} rotY={45}>
  <PolyScene
    textureLighting="dynamic"
    ambientLight={{ intensity: 0.35 }}
    directionalLight={{ direction: [0.5, -0.6, 0.7], intensity: 1 }}
  >
    <PolyOrbitControls drag wheel />
    <PolyMesh src="/model.glb" autoCenter castShadow />
    <PolyGround size={8} />
    {polygons.map((p, i) => <Poly key={i} {...p} onClick={() => select(i)} />)}
  </PolyScene>
</PolyCamera>

<script type="module" src="https://esm.sh/@layoutit/polycss/elements"></script>

<poly-camera rot-x="65" rot-y="45">
  <poly-scene>
    <poly-orbit-controls drag wheel></poly-orbit-controls>
    <poly-mesh src="/model.glb"></poly-mesh>
  </poly-scene>
</poly-camera>

© layoutit, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 641 other files in website/public of layoutit/polycss.

• SKILL.md
• CNAME
• builder/shape-thumbnails/box.png
• builder/shape-thumbnails/cone.png
• builder/shape-thumbnails/cylinder.png
• builder/shape-thumbnails/dodecahedron.png
• builder/shape-thumbnails/icosahedron.png
• builder/shape-thumbnails/octahedron.png
• builder/shape-thumbnails/sphere.png
• builder/shape-thumbnails/tetrahedron.png
• builder/shape-thumbnails/torus.png
• favicon.ico
• fonts/default.ttf
• gallery/apple.json
• gallery/blank.json
• gallery/cat.json
• gallery/chair.json
• … and 625 more

Open the folder on GitHubat commit 04a1b66