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 hps-retro-tvgit 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/hps-retro-tv)<a href="https://agentmods.dev/skills/nexu-io/open-design/hps-retro-tv"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/hps-retro-tv/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/hps-retro-tv"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/hps-retro-tv.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Tool Misuse · line 195 Tool calls are chained to bypass individual safety checks or escalate capabilities beyond what any single tool call would allow.Fix: Limit tool chaining depth and validate the output of each tool before passing it to the next. Require explicit user approval for multi-step chains.
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 | $0.00043 | $0.02826 |
| Opus 5 | $0.00022 | $0.01413 |
| Sonnet 5 | $0.00009 | $0.00565 |
| Haiku 4.5 | $0.00004 | $0.00283 |
Grade A, and why
hps-retro-tv 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 — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Retro TV（复古显像管）
A locked single-theme deck plugin: the retro-tv skin from the upstream
MIT-licensed lewislulu/html-ppt-skill
(36 themes × 31 layouts), shipped as one self-contained seed — example.html —
that carries the full token sheet, the broadcast decor devices, the slide
scaffold, and the keyboard runtime.
Start from example.html. Replace content only. Never rewrite the design
system or the runtime script. Never introduce colors or fonts outside this
spec.
Positioning vs. sibling retro-skeuomorphic plugins: this is the light
warm-cream picture-tube device — scanlines on a cream canvas, not on a black
screen. retro-windows is Win95 grey window chrome (title bars, bevels);
hermes is dark-background green-phosphor terminal CRT. The three device
systems are mutually exclusive — no dark backgrounds, no terminal language,
no window chrome here. Do not mix.
Locked token sheet (do not deviate)
Every variable below is defined in the seed's :root. Slides reference
tokens only — never hard-code a color in slide markup.
:root{
--bg:#f5ecd7; /* warm cream canvas */
--bg-soft:#efe4c6;
--surface:#fbf5e2; /* parchment card face */
--surface-2:#efe3c2;
--border:rgba(120,70,20,.22); /* warm brown hairlines */
--border-strong:rgba(120,70,20,.45);
--text-1:#2a1a08; --text-2:#6b4a22; --text-3:#a68656;
--accent:#e67e14; /* amber — the lead */
--accent-2:#c73a1f; /* brick red — headlines & emphasis */
--accent-3:#f2b544; /* gold — support */
--good:#3e8940; --warn:#e67e14; --bad:#c73a1f;
--grad:linear-gradient(135deg,#c73a1f,#e67e14 55%,#f2b544);
--grad-soft:linear-gradient(135deg,#fde6c4,#fbd9a0);
--radius:10px; --radius-sm:6px; --radius-lg:16px;
--shadow:0 6px 0 rgba(80,40,0,.12),0 12px 28px rgba(80,40,0,.15);
--shadow-lg:0 10px 0 rgba(80,40,0,.15),0 24px 50px rgba(80,40,0,.2);
--font-sans:'Inter','Noto Sans SC',sans-serif;
--font-serif:'Playfair Display','Noto Serif SC',serif;
--font-mono:'JetBrains Mono',SFMono-Regular,Menlo,monospace;
--font-display:'Playfair Display','Noto Serif SC',serif;
--letter-tight:-.01em; --letter-normal:0;
--ease:cubic-bezier(.4,0,.2,1);
}
What ships with it
3 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 · 197 lines · 43 tokens per session scan A 5f0f9d6962c3
hps-retro-tv is a skill published in the GitHub repository nexu-io/open-design (95,309 stars, last pushed yesterday), licensed Apache-2.0. It adds 43 tokens to every session and 2,826 once invoked, about $0.0002 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
hps-retro-tv
A family history told through five decades of home movies — the opening question, the eras, and what the footage reveals. Built as a decision-grade story deck for family, close friends.
hps-memphis-pop
A pop-culture retrospective on how 1980s design language shaped today's apps — the scenes, the turning point, and the takeaway. Built as a decision-grade story deck for talk audience, design community.
html-ppt-xhs-pastel-card
A personal manifesto: a year of saying yes — the premise, the scenes, the turn, and the meaning that lands. Built as a decision-grade story deck for community, talk audience.
html-ppt-zhangzara-8-bit-orbit
A gamer's journey building a retro-arcade collection — the obsession, the hunt, and what the machines came to mean. Built as a decision-grade story deck for friends, hobby community.
html-ppt-zhangzara-pink-script
A wedding-anniversary tribute photo essay — a decade in scenes, the turning points, and the quiet meaning of staying. Built as a decision-grade story deck for couple, family, friends.
html-ppt-zhangzara-sakura-chroma
A cherry-blossom-season travel photo essay through Kyoto — the arrival, the peak bloom, and the moment that made the trip. Built as a decision-grade story deck for friends, travel readers.