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 agentmods add skills/nexu-io/open-design/docs-pagenpx skills add nexu-io/open-design --skill docs-pagegit 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/docs-page)<a href="https://agentmods.dev/skills/nexu-io/open-design/docs-page"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/docs-page.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00044 | $0.00779 |
| Opus 5 | $0.00022 | $0.00390 |
| Sonnet 5 | $0.00009 | $0.00156 |
| Haiku 4.5 | $0.00004 | $0.00078 |
Grade A, and why
docs-page 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 6d 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.
Docs Page Skill
Produce a single, three-column documentation page in one HTML file.
Workflow
- Read the active DESIGN.md (injected above). Use the body type token for prose; the mono token for code; respect line-height and max-width rules.
- Pick a topic from the brief — the page should look like real docs, not a generic wireframe. Concrete API names, command examples, plausible parameters.
- Lay out three regions, expressed on the inline axis so the
layout flips correctly under
dir="rtl":- Inline-start nav (240–280px, sticky): grouped link list, current
page bolded with an
inline-start-edge accent stripe. 3–5 groups of 4–8 links. - Article body (max-width ~720px, centered in the middle column): H1, lede paragraph, H2 sections, code blocks, callout boxes (note / warning), inline links, lists.
- Inline-end TOC (200–240px, sticky): "On this page" with the H2/H3 anchors, current section highlighted as the user scrolls.
- Inline-start nav (240–280px, sticky): grouped link list, current
page bolded with an
- Write a single HTML document:
<!doctype html>through</html>, all CSS inline.- CSS Grid for the three columns; sticky positioning for the rails.
- Code blocks: monospace token, soft surface fill, copy-button affordance (visual only — no JS needed).
- Anchor IDs on every H2/H3 so the TOC links work.
data-od-idon the nav, article, and TOC.
- Prose: write at least 350 words of believable docs. Include at least one shell command, one code snippet (5–15 lines), one callout, one table.
- Self-check:
- Body text wraps at the DS line-length sweet spot (60–75 chars).
- Code uses the DS mono token, not generic
monospace. - Accent is restrained — used for active nav item, links, one callout border. Not on body text.
- Page is readable at 1280w and collapses gracefully below 900w (TOC drops out, nav becomes a top drawer).
- Use logical CSS (
margin-inline-start,border-inline-start,inset-inline-end,text-align: start) on the rails and accent stripe so the layout flips correctly underdir="rtl".
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.
- 6d ago First seen · 81 lines · 44 tokens per session scan A 2446a71d3513
docs-page is a skill published in the GitHub repository nexu-io/open-design (94,311 stars, last pushed today), licensed Apache-2.0. It adds 44 tokens to every session and 779 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 2026-08-30.
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