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/simple-decknpx skills add nexu-io/open-design --skill simple-deckgit 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/simple-deck)<a href="https://agentmods.dev/skills/nexu-io/open-design/simple-deck"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/simple-deck.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 | $0.00038 | $0.01407 |
| Opus 5 | $0.00019 | $0.00704 |
| Sonnet 5 | $0.00008 | $0.00281 |
| Haiku 4.5 | $0.00004 | $0.00141 |
Grade A, and why
simple-deck 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 yesterday.
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 — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Simple Deck Skill
Produce a single-file horizontal-swipe HTML deck using the seed and layout library.
Resource map
simple-deck/
├── SKILL.md ← you're reading this
├── assets/
│ └── template.html ← seed: tokens + slide primitives + proven nav script (READ FIRST)
└── references/
├── layouts.md ← 8 paste-ready slide layouts + theme-rhythm rules
└── checklist.md ← P0/P1/P2 self-review (rhythm spot-check at bottom)
Workflow
Step 0 — Pre-flight
- Read
assets/template.htmlend-to-end through the<style>block AND the<script>block. The script solves five iframe-specific bugs (real scroller detection, dual capture-phase listeners, auto-focus, noscrollIntoView, position persistence) — do not rewrite it. - Read
references/layouts.mdso you know the 8 layouts. Pay special attention to the "Theme rhythm" section — it's the rule that prevents the deck from feeling sleepy. - 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>.
Step 2 — Decide slide count + theme rhythm BEFORE writing any slide
Default: 6 slides unless the brief says otherwise.
| Audience / format | Slides |
|---|---|
| Product overview / lightning talk (5–10 min) | 6 |
| Pitch deck (15 min) | 8–10 |
| Investor update / longer talk (20–30 min) | 12–18 |
Then write out the rhythm before any HTML — for example, 8 slides:
01 hero light center Cover
02 light Problem
03 hero dark center Big stat
04 light Three points
05 dark Pipeline
06 hero light center Quote
07 light Before / after
08 hero dark center Ask
A healthy sequence has:
- No 3+ same theme in a row
- ≥ 1
hero darkAND ≥ 1hero light(for 8+ slides) - Alternating breath every 3–4 slides
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.
- yesterday First seen · 132 lines · 38 tokens per session scan A db2be4b43261
simple-deck is a skill published in the GitHub repository nexu-io/open-design (94,103 stars, last pushed today), licensed Apache-2.0. It adds 38 tokens to every session and 1,407 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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