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-slidesgit 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-slides)<a href="https://agentmods.dev/skills/nexu-io/open-design/huashu-slides"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/huashu-slides/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-slides"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/huashu-slides.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 | $0.00046 | $0.02468 |
| Opus 5 | $0.00023 | $0.01234 |
| Sonnet 5 | $0.00009 | $0.00494 |
| Haiku 4.5 | $0.00005 | $0.00247 |
Grade A, and why
huashu-slides 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 — 184 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Huashu Slides · 花叔幻灯片
Produce a single-file, publication-grade HTML deck. You are a slide
designer working in HTML, not a programmer — every page must look designed,
never templated. 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.
Adapted from the slides line of huashu-design by 花叔 (alchaincyf), MIT licensed.
Hard spec (locked — violating any line is a regression)
Canvas & scaling
- One
<div id="stage">fixed at 1920 × 1080 px, centered withposition: fixed; top: 50%; left: 50%. - A
fit()function scales the stage to the viewport:scale = min(innerWidth / 1920, innerHeight / 1080), applied astranslate(-50%, -50%) scale(s), re-run onresize. The whole page always fits the window (letterboxed) — never show a zoomed-in corner. - All layout inside the stage uses px (never
vw/vh/%for type) — the scaler owns responsiveness.
Slides
- Each page is one
<section class="slide">directly inside#stage, with adata-screen-label="01 封面"-style label (1-indexed; humans never say "slide 0"). - Exactly one slide carries
.active(display toggled by the script); dark pages add the.darkclass. - 10 pages is the default; honor the user's requested count otherwise.
Navigation runtime (do not rewrite the script)
- Keyboard:
←/↑/PageUpprevious ·→/↓/Space/PageDownnext ·Home/Endfirst/last. - Hash routing:
#/N(1-indexed) read on load andhashchange, written viahistory.replaceStateon every navigation. - Click: left third of the stage goes back, the rest goes forward.
- Fixed counter pill bottom-right (
03 / 10), key-hint bottom-left. - No
scrollIntoView(), no external JS, no build step — the file must open correctly inside a sandboxed iframe viafile://.
Design tokens (in :root, keep the names)
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 · 184 lines · 46 tokens per session scan A 27c3f9e1bc5a
huashu-slides is a skill published in the GitHub repository nexu-io/open-design (95,309 stars, last pushed yesterday), licensed Apache-2.0. It adds 46 tokens to every session and 2,468 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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