OpenDesign is an open-source, local-first desktop app that lets coding agents create prototypes, dashboards, slide decks, images, video, and design systems as exportable files. It is used by people working with agent runtimes such as Claude Code, Codex, Cursor, and DeepSeek Harness. The catalogue add-ons extend the OpenDesign workflow with skills, instructions, commands, and plugins.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add nexu-io/open-design --skill webgl-experiencegit clone --depth 1 https://github.com/nexu-io/open-designWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/nexu-io/open-design/webgl-experience)<a href="https://agentmods.dev/skills/nexu-io/open-design/webgl-experience"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/webgl-experience.svg" alt="Measured on agentmods" height="20"></a>- Snyk pass
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00114 | $0.00942 |
| Opus 5 | $0.00057 | $0.00471 |
| Sonnet 5 | $0.00023 | $0.00188 |
| Haiku 4.5 | $0.00011 | $0.00094 |
Grade A, and why
webgl-experience scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.
WebGL Experience Skill
Produce a single self-contained index.html that renders a real-time WebGL (or WebGL2) visual full-screen, with a clean typographic overlay on top.
Why this is a powered artifact
OpenDesign detects getContext('webgl2') / new Worker / SharedArrayBuffer and renders this file in powered preview — a cross-origin-isolated iframe with allow-same-origin. That means real Web Workers, SharedArrayBuffer, WASM, and the full GPU pipeline are available. You do not need to work around the opaque sandbox. Prefer webgl2 for modern features; fall back to webgl when the effect allows.
Resource map
webgl-experience/
├── SKILL.md ← you're reading this
└── example.html ← a working WebGL2 aurora-field reference (READ FIRST)
Workflow
Step 0 — Read the reference
Read example.html end to end. Note the shape: one full-viewport <canvas>, a fragment-shader draw loop on a fullscreen triangle, a DPR-aware resize, and a requestAnimationFrame tick. The overlay (kicker → h1 → sub) is pure HTML/CSS layered above the canvas via z-index.
Step 1 — Choose the visual
Pick ONE technique that fits the brief:
- Fragment-shader field (default): domain-warped fbm noise, flow fields, plasma, gradients. Cheapest, always 60fps.
- Raymarched scene: SDF spheres/boxes with soft shadows for a 3D hero.
- Instanced geometry: thousands of points/quads driven by a vertex shader.
- Post-processed image: sample a data-URI texture and distort/dither it.
Step 2 — Build index.html
- Keep it one file, zero external requests (inline the shader source; embed any texture as a
data:URI). Powered mode allows CDN loads, but self-contained previews are faster and portable. - Always:
alpha:false, DPR clamped to 2,viewporton resize, and a guard that shows a graceful message if the context is null. - Compile shaders with error logging (
getShaderInfoLog) so a typo fails loudly, not silently black.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 81 lines · 114 tokens per session scan A afc943af0c7e
webgl-experience is a skill published in the GitHub repository nexu-io/open-design (94,754 stars, last pushed today), licensed Apache-2.0. It adds 114 tokens to every session and 942 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other skills, from other repositories
deck-guizang-editorial
A slide-deck template combining electronic-magazine layouts with an e-ink, printed-paper look. It offers five fixed color palettes and ten reusable page layouts for storytelling and editorial content.
deck-open-slide-canvas
A presentation layout system for freely arranging React components on a fixed 1920×1080 slide canvas. React is a way to build interfaces from reusable pieces.
frame-data-chart-nyt
A design template for turning CSV data, JSON, or a written finding into a New York Times-style chart frame for video or social media.
frame-flowchart-sticky
A single-file HTML template for showing a process or system as a whiteboard with coloured sticky notes, curved arrows, and optional mouse interactions.
frame-liquid-bg-hero
A design template for a fluid, colorful background with large overlaid text, suitable for a video opening, website landing-page hero, or poster. It offers CSS, canvas, or WebGL approaches, with a static fallback for reduced motion or simpler use.
frame-macos-notification
A template for realistic macOS Big Sur-style notification banners, with an app icon, title, message, and optional action button.