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 saas-landing-skillgit 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/saas-landing-skill)<a href="https://agentmods.dev/skills/nexu-io/open-design/saas-landing-skill"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/saas-landing-skill/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/saas-landing-skill"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/saas-landing-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- 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 | $0.00052 | $0.01109 |
| Opus 5 | $0.00026 | $0.00554 |
| Sonnet 5 | $0.00010 | $0.00222 |
| Haiku 4.5 | $0.00005 | $0.00111 |
Grade A, and why
saas-landing 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 9d 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.
This is a copy
88% identical to saas-landing — 6 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SaaS Landing Skill
Produce a single-page SaaS landing. Agent, follow this workflow exactly.
1. Read context
Before writing anything:
- Read
DESIGN.mdin the current working directory. If missing, stop and ask for one. - Identify the color palette, typography tokens, and layout principles.
- Note the "Agent Prompt Guide" section — it overrides any instruction here if they conflict.
2. Plan sections
Required sections, in order:
- Hero — logo-or-wordmark, headline (tagline input), subhead (1–2 sentences), primary CTA, secondary CTA. Use the hero_density parameter as vertical padding in px.
- Features — 3–6 feature tiles. Each: icon, short title, 1–2 sentence body.
- Social proof —
proof_countlogos or testimonials. If 0, skip this section. - Pricing — 2–3 tiers. Include only if
has_pricingis true. - Footer CTA — large accent-colored band with one-button call to action.
- Footer — minimal: links + copyright.
3. Apply design system
- All colors must come from DESIGN.md tokens. Do not invent hex values.
- Typography: use the declared display font for headlines, body font for everything else.
- Layout: respect the grid, max-width, and section spacing rules.
- Components: use declared button/card/input patterns. Do not add shadows if DESIGN.md's Depth & Elevation says minimal.
- Accent: use the accent color only once in the hero, once in the footer CTA, and for all links. Do not flood the page.
4. Write the file
Output a single self-contained index.html with:
- All CSS inlined in a
<style>block in<head>. - System font fallbacks if DESIGN.md fonts aren't loadable from Google Fonts etc.
- No external JS.
- Semantic HTML (
<header>,<main>,<section>,<footer>). - Each editable element tagged with
data-od-id="<unique-slug>"so the host app's comment mode can target it.
5. Self-check
Before finishing, verify:
- All text is content-meaningful, not lorem ipsum (use product_name and tagline inputs; generate plausible specific copy for the rest).
- No broken color references (every CSS color value is in DESIGN.md's palette or a valid alpha/fallback variant).
- Responsive breakpoints match DESIGN.md's Responsive Behavior section.
- The page looks good at 1440w, 768w, and 375w (mentally simulate).
- Accent used no more than twice total.
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.
- 9d ago First seen · 121 lines · 52 tokens per session scan A 4e495a905036
saas-landing is a skill published in the GitHub repository nexu-io/open-design (95,624 stars, last pushed today), licensed Apache-2.0. It adds 52 tokens to every session and 1,109 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to saas-landing, differing in 6 lines, and is treated as a copy.
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prototype-web
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