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 email-marketinggit 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/email-marketing)<a href="https://agentmods.dev/skills/nexu-io/open-design/email-marketing"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/email-marketing/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/email-marketing"><img src="https://agentmods.dev/badge/skills/nexu-io/open-design/email-marketing.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 | $0.00085 | $0.00899 |
| Opus 5 | $0.00043 | $0.00449 |
| Sonnet 5 | $0.00017 | $0.00180 |
| Haiku 4.5 | $0.00009 | $0.00090 |
Grade A, and why
email-marketing 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 12d 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
3 near-identical copies found in the catalogue:
- email-marketing — 100% identical, 0 lines differ
- email-marketing — 97% identical, 1 lines differ
- email-marketing — 97% identical, 1 lines differ
How it starts
The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Email Marketing Skill
Produce a single HTML email — centered, single column, no chrome around the email body. Treat it like a marketing artifact: one big idea, one CTA.
Workflow
- Read the active DESIGN.md (injected above). Email leans on the display font more than any other surface — pick the loudest type token in the DS for the headline lockup.
- Pick the brand + product from the brief. Generate a real wordmark, a real product name, and one real benefit sentence — no placeholders.
- Layout, in order, all centered inside a 600–680px column on a tinted
page background (so the email body looks like an email, not the page):
- Masthead — wordmark on the left + 3 short nav links (SHOP, JOURNAL, MEMBERS) on the right. Thin underline.
- Hero block — a 16:9 product image placeholder. Use a DS-tinted gradient or a stylized SVG silhouette of the product (shoe, bottle, headphones, whatever the brief implies). Add a tiny brand stamp on the top-left and a colorway tag on the bottom-left.
- Eyebrow — small caps, accent color, separated by
·characters (e.g. "NEW · MAX-CUSHION TRAINER · EMBER FLARE"). - Headline lockup — 2–3 line headline using the display font, all caps,
extra-tight tracking. Apply a slight skew (
transform: skew(-6deg)) on one accent word to give it a sporty parallelogram feel. - Body — 2–3 sentence paragraph, left-aligned, body font.
- Primary CTA — solid pill or block button. One only.
- Specs grid — 2×2 grid of (big number + unit + label) callouts using the display font for the numbers.
- Footer — wordmark, address line, unsubscribe + view-in-browser links.
- Write a single HTML document:
<!doctype html>through</html>, CSS inline.- Center the column with
margin: 0 auto. Setbody { background: <tint> }so the email-on-page metaphor reads. - No external images — use inline SVG or DS-tinted gradient blocks for the product photo.
data-od-idon the masthead, hero, headline, CTA, specs.
- Self-check:
- Email reads top to bottom in 8–10 seconds.
- One CTA. Accent appears at most twice (eyebrow + CTA, or headline word).
- Looks legible on a 480px window (column reflows, type drops one step).
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.
- 12d ago First seen · 85 lines · 85 tokens per session scan A 197f084a1b73
email-marketing is a skill published in the GitHub repository nexu-io/open-design (95,309 stars, last pushed yesterday), licensed Apache-2.0. It adds 85 tokens to every session and 899 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 2026-08-30.
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