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/softspark/ai-toolkit/design-engineeringnpx skills add softspark/ai-toolkit --skill design-engineeringgit clone --depth 1 https://github.com/softspark/ai-toolkitWrote 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/softspark/ai-toolkit/design-engineering)<a href="https://agentmods.dev/skills/softspark/ai-toolkit/design-engineering"><img src="https://agentmods.dev/badge/skills/softspark/ai-toolkit/design-engineering.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 | $0.00043 | $0.04093 |
| Opus 5 | $0.00022 | $0.02047 |
| Sonnet 5 | $0.00009 | $0.00819 |
| Haiku 4.5 | $0.00004 | $0.00409 |
Grade A, and why
design-engineering 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 3d 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 — 342 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design Engineering Skill
Based on Emil Kowalski's design engineering philosophy — UI polish, component craftsmanship, and the compound value of invisible details.
Core Principles
- Taste is trainable. Develops through studying exceptional work, reverse-engineering animations, and intentional practice.
- Invisible details create love. Most UI refinements users never consciously register — but combined they produce something stunning.
- Beauty differentiates. When functionality is table stakes, aesthetic excellence becomes genuine leverage.
Anti-Slop Visual & Structural Checklist
Defaults that signal machine-generated UI ("AI slop"). Each is a falsifiable rule to uphold:
- Avoid full-bleed saturated gradient backgrounds (purple-to-pink/blue hero washes) and gradient headlines (
background-clip: text). Use solid ink or warm neutral tinting. - Avoid emoji as load-bearing decoration (emoji as icons, bullet markers, or section badges). Use a real icon set (Lucide/Phosphor/Heroicons) or typographic hierarchy.
- Avoid the 3-equal-column card grid with icon-above-heading tiles, nested cards-in-cards, or cards with thick coloured left-edge side stripes.
- Avoid hand-drawn fake imagery in SVG (synthetic "photos", invented logos, faux screenshots). Use a real asset or an honest labeled placeholder.
- Avoid fake re-drawn UI chrome (mock browser bars with traffic-light dots, mock IDE title bars, faux phone frames). Let content stand cleanly or use real screenshots in a
<figure>. - Avoid default-attractor sameness (Hero → 3 features → CTA → footer). Pick intentional macrostructures and vary heading placement, column rhythm, and divider language.
- Avoid the overused default font stack (Inter/Roboto on system-ui with no pairing). Apply the 2+1 rule (display + body + at most 1 outlier face in <=2 slots).
- Avoid italic headers: headings and display type are always roman (
font-style: normal). Never use single-word italic emphasis inside a headline.
What ships with it
2 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.
- 3d ago First seen · 342 lines · 43 tokens per session scan A 0a267a22273e
design-engineering is a skill published in the GitHub repository softspark/ai-toolkit (170 stars, last pushed yesterday), licensed Apache-2.0. It adds 43 tokens to every session and 4,093 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.
Other skills, from other repositories
accessibility-checker
Vérifie et améliore l'accessibilité web (WCAG 2.1/2.2). Se déclenche avec "accessibilité", "a11y", "WCAG", "screen reader", "ARIA", "contraste", "accessible", "handicap", "lecteur d'écran". Also triggers on "accessibility audit", "WCAG compliance", "screen reader issues".
frontend-design
Create distinctive, production-grade frontend interfaces with high design quality. Covers design thinking, typography pairing, color theory, motion design, spatial composition, and code quality. Generates real working code — HTML/CSS/JS or React — with intentional aesthetic direction, not generic AI output.
accessibility-checker
Audit and fix accessibility issues — WCAG 2.2 compliance, ARIA labels, color contrast, keyboard navigation, and screen-reader compatibility.
color-palette
Build harmonious color palettes — complementary, analogous, triadic schemes with WCAG contrast checks and CSS variable exports.
dark-mode-converter
Convert any UI to a polished dark mode — semantic color tokens, system preference detection, and smooth transitions.
frontend-design
Design pixel-perfect frontend UIs with HTML/CSS/Tailwind — responsive layouts, component libraries, and design-to-code workflows.