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 huashu-keynote-blackgit 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/huashu-keynote-black)<a href="https://agentmods.dev/skills/nexu-io/open-design/huashu-keynote-black"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/huashu-keynote-black/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/huashu-keynote-black"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/huashu-keynote-black.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 | $0.00043 | $0.02830 |
| Opus 5 | $0.00022 | $0.01415 |
| Sonnet 5 | $0.00009 | $0.00566 |
| Haiku 4.5 | $0.00004 | $0.00283 |
Grade A, and why
huashu-keynote-black 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 8d 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 — 189 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Keynote Black · 黑场大数字
Produce a single-file, black-stage keynote deck. You are directing a
launch event, not writing a document: the screen is a stage, every page is
one beat, and the audience must be able to read it from the last row. The
visual system, canvas contract, and navigation runtime are locked by
example.html. Start from example.html, replace content only — do not
rewrite the design or the script. Do not introduce any color or font outside
this spec.
Generated from the「黑底巨型数字剧场 / Black Big-Number Stage」entry
(大胆派, 还原 97%) of references/design-styles.md in
huashu-design by 花叔
(alchaincyf), MIT licensed — references: Steve Jobs' 2007 iPhone keynote,
Lei Jun's Xiaomi SU7 Ultra launch, Spotify Wrapped, Presentation Zen. The
upstream entry is a written spec; this plugin realizes it as a full
multi-section deck while preserving its DNA.
Not to be confused with siblings: dir-key-nav-minimal rotates 8 colored
monochrome pages (indigo/cream/crimson/jade…) — this deck is constant pure
black with one accent and no color rotation; studio is a black +
electric-yellow design-studio text style with no big numbers; ppt-keynote
is a light generic Keynote card deck.
Hard spec (locked — violating any line is a regression)
Canvas & runtime
- One
<div id="stage">fixed at 1920 × 1080 px, centered withposition: fixed; top: 50%; left: 50%; afit()function appliestranslate(-50%, -50%) scale(min(innerWidth/1920, innerHeight/1080))on load andresize. All inner layout in px — the scaler owns responsiveness. - Each page is one
<section class="slide">inside#stagewith adata-screen-label="01 封面"-style label; exactly one slide carries.active. There are no light pages — every page is the black stage. - Navigation (keep the script verbatim):
←/↑/PageUpprevious,→/↓/Space/PageDownnext,Home/Endfirst/last;#/Nhash routing (1-indexed) read on load +hashchange, written viahistory.replaceState; click left third = back, rest = forward; fixed counter pill bottom-right, key-hint bottom-left. No external JS, no build step — the file must open inside a sandboxed iframe viafile://.
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.
- 8d ago First seen · 189 lines · 43 tokens per session scan A 67d31642236d
huashu-keynote-black is a skill published in the GitHub repository nexu-io/open-design (95,624 stars, last pushed today), licensed Apache-2.0. It adds 43 tokens to every session and 2,830 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.
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