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 mobile-appgit 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/mobile-app)<a href="https://agentmods.dev/skills/nexu-io/open-design/mobile-app"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/mobile-app.svg" alt="Measured on agentmods" 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 | $0.00079 | $0.00979 |
| Opus 5 | $0.00039 | $0.00490 |
| Sonnet 5 | $0.00016 | $0.00196 |
| Haiku 4.5 | $0.00008 | $0.00098 |
Grade A, and why
mobile-app 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 5d 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- mobile-app — 100% identical, 0 lines differ
- mobile-app — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mobile App Skill
Produce a single mobile-app screen mockup, framed inside a real-feeling iPhone 15 Pro device.
Resource map
mobile-app/
├── SKILL.md ← you're reading this
├── assets/
│ └── template.html ← seed: device frame + screen primitives (READ FIRST)
└── references/
├── layouts.md ← 6 screen archetypes (Feed / Detail / Onboarding / Profile / Checkout / Focus)
└── checklist.md ← P0/P1/P2 self-review (anti-fake-device)
Workflow
Step 0 — Pre-flight
- Read
assets/template.htmlend-to-end through the<style>block. The Dynamic Island, status bar SVG icons, home indicator, side rails, and tab bar are all already drawn in HTML/SVG — do not re-implement them inline on each screen. - Read
references/layouts.mdso you know which 6 archetypes exist. - Read the active DESIGN.md — map its tokens to the six
:rootvariables in the seed.
Step 1 — Copy the seed
Copy assets/template.html to the project root as index.html. Replace the six :root variables with the active design system's tokens. Replace the page <title> and the caption above the device.
Step 2 — Pick exactly one archetype
| Brief language | Use |
|---|---|
| feed, inbox, timeline, list, messages, notifications | A — Feed |
| article, post, item, recipe, song, product, song detail | B — Detail |
| sign-up, welcome, intro, walkthrough, tour | C — Onboarding |
| profile, account, user page, someone's bio | D — Profile |
| checkout, payment, order, form, settings step | E — Checkout |
| timer, map, dashboard widget, single big number | F — Focus / hero card |
A mobile screen does one job. If the brief seems to combine two, ship one screen and offer the other as a follow-up.
Step 3 — Paste and fill
Copy the archetype block from layouts.md into <main class="content">, replacing the placeholder card. Fill bracketed text with real, specific copy from the brief. Drop the <nav class="tabbar"> block entirely for archetypes that don't show one (B, C, E).
What ships with it
4 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.
- 5d ago First seen · 103 lines · 79 tokens per session scan A 8a59f65e089d
mobile-app is a skill published in the GitHub repository nexu-io/open-design (94,754 stars, last pushed today), licensed Apache-2.0. It adds 79 tokens to every session and 979 once invoked, about $0.0004 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
mobile-app
A design template for a single-screen iPhone 15 Pro app mockup, including the phone frame, status bar, app header, main content, and bottom navigation.
mobile-onboarding
A visual template showing three mobile-app onboarding screens side by side: a splash screen, a feature introduction, and sign-in.
deck-guizang-editorial
A slide-deck template combining electronic-magazine layouts with an e-ink, printed-paper look. It offers five fixed color palettes and ten reusable page layouts for storytelling and editorial content.
frame-flowchart-sticky
A single-file HTML template for showing a process or system as a whiteboard with coloured sticky notes, curved arrows, and optional mouse interactions.
frame-macos-notification
A template for realistic macOS Big Sur-style notification banners, with an app icon, title, message, and optional action button.
social-reddit-card
A realistic Reddit post card with a community name, author details, title, content, vote controls, comment count, awards, and sharing actions. Reddit is a discussion platform organized into topic-based communities called subreddits.