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-neon-gridgit 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-neon-grid)<a href="https://agentmods.dev/skills/nexu-io/open-design/webgl-neon-grid"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/webgl-neon-grid/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/nexu-io/open-design/webgl-neon-grid"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/webgl-neon-grid.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00115 | $0.00874 |
| Opus 5 | $0.00057 | $0.00437 |
| Sonnet 5 | $0.00023 | $0.00175 |
| Haiku 4.5 | $0.00012 | $0.00087 |
Grade A, and why
webgl-neon-grid 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 7d 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 — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Neon Grid Skill
Produce a single self-contained index.html that renders a real-time synthwave scene full-screen — a perspective floor grid, a banded retro sun, and a starfield — with a clean typographic overlay on top.
Why this is a powered artifact
OpenDesign detects getContext('webgl2') and renders this file in powered preview — a cross-origin-isolated iframe with allow-same-origin. The full GPU pipeline is available; you do not need to work around the opaque sandbox.
Resource map
webgl-neon-grid/
├── SKILL.md ← you're reading this
└── example.html ← a working synthwave grid + sun shader (READ FIRST)
Workflow
Step 0 — Read the reference
Read example.html end to end. Note the shape: a horizon split; above the horizon a sky gradient, a circular sun cut by horizontal scanline bands, and hashed stars; below the horizon a perspective floor grid (z = k / depth, x = uv.x * z) that scrolls with time, its lines thinning and fading with distance. Everything is analytic — no raymarch needed.
Step 1 — Choose the palette
Synthwave lives on its gradient:
- Outrun (default): magenta→indigo sky, orange→pink banded sun, cyan/magenta grid.
- Vaporwave: pastel teal + pink, softer sun, wider grid spacing.
- Terminal: near-monochrome green grid on black for a colder, hacker read.
Step 2 — Build index.html
- One file, zero external requests. Fullscreen triangle + fragment shader.
- Project the floor with a simple perspective divide; derive grid lines from
abs(fract(gv) - 0.5)and a distance-scaled line width so far lines don't alias. - Fade the grid into a horizon haze and add a hot horizon band; band the sun with
sin(y * f)cuts on its lower half. - Compile shaders with error logging so a typo fails loudly, not silently black.
Step 3 — Overlay + brand
- Map the accent colors to the active DESIGN.md when one is present; otherwise the outrun palette above, with the kicker in lime
#63fe13. - Headline ≤ 12ch plus one supporting line. Keep the horizon and sun as the hero.
What ships with it
2 files 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.
- 7d ago First seen · 78 lines · 115 tokens per session scan A e9656b222bb6
webgl-neon-grid is a skill published in the GitHub repository nexu-io/open-design (95,309 stars, last pushed today), licensed Apache-2.0. It adds 115 tokens to every session and 874 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.
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