A set of guidelines for designing and coding user interfaces, including page structure, styling, forms, responsive layouts, accessibility, speed, and animation.

Use it when building or reviewing HTML, CSS, forms, responsive pages, images, fonts, and interactive effects.

It helps prevent interfaces that are difficult to use, inaccessible, slow, or awkward on different screen sizes.

ui-design — Skill for Claude Code and Codex by PyModel

Install

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.

Any agent

npx skills add PyModel/react-frontend-skills --skill ui-design

Clone the repo

git clone --depth 1 https://github.com/PyModel/react-frontend-skills

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/pymodel/react-frontend-skills/ui-design/github.svg)](https://agentmods.dev/skills/pymodel/react-frontend-skills/ui-design)

Your own site

<a href="https://agentmods.dev/skills/pymodel/react-frontend-skills/ui-design"><img src="https://agentmods.dev/badge/skills/pymodel/react-frontend-skills/ui-design/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/pymodel/react-frontend-skills/ui-design"><img src="https://agentmods.dev/badge/skills/pymodel/react-frontend-skills/ui-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 12 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,105 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

Socket pass 26 Sept 2026
Snyk pass 26 Sept 2026

How audits are shown

Origin 88% copy Near-identical to another mod in the catalogue.

Token cost

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	$0.00012	$0.01105
Opus 5.5	$0.00005	$0.00442
Sonnet 5.5	$0.00002	$0.00221
Haiku 4.5	$0.00001	$0.00111

Measured 23d ago against content hash 18251c2a263a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ui-design 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 23d 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.

Origin

This is a copy

88% identical to ui-design — 14 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.

skills/ui-design/SKILL.md · 103 lines

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.

UI/UX Best Practices Frontend Design

Comprehensive UI/UX and frontend design best practices guide. Contains 42 rules across 8 categories, prioritized by impact to guide accessible, performant, and user-friendly interface development.

When to Apply

Reference these guidelines when:

Structuring HTML for accessibility and semantics
Writing CSS for responsive layouts and visual hierarchy
Optimizing images and fonts for Core Web Vitals
Designing forms with proper validation and error handling
Adding animations and interactive elements

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	Accessibility & WCAG Compliance	CRITICAL	`access-`
2	Core Web Vitals Optimization	CRITICAL	`cwv-`
3	Visual Hierarchy & Layout	HIGH	`layout-`
4	Responsive & Mobile-First Design	HIGH	`resp-`
5	Typography & Font Loading	MEDIUM-HIGH	`typo-`
6	Color & Contrast	MEDIUM	`color-`
7	Forms & Validation UX	MEDIUM	`form-`
8	Animation & Performance	LOW-MEDIUM	`anim-`

Quick Reference

1. Accessibility & WCAG Compliance (CRITICAL)

access-semantic-html - Use semantic HTML elements for screen readers
access-keyboard-navigation - Ensure full keyboard navigation
access-focus-indicators - Provide visible focus indicators
access-alt-text - Provide meaningful alt text for images
access-aria-labels - Use ARIA labels for icon-only controls
access-target-size - Ensure minimum touch target size (24×24px)
access-heading-hierarchy - Maintain logical heading hierarchy

2. Core Web Vitals Optimization (CRITICAL)

cwv-optimize-lcp - Optimize Largest Contentful Paint under 2.5s
cwv-minimize-cls - Minimize Cumulative Layout Shift under 0.1
cwv-improve-inp - Improve Interaction to Next Paint under 200ms
cwv-responsive-images - Serve responsive images with srcset
cwv-lazy-load-offscreen - Lazy load offscreen images and iframes
cwv-critical-css - Inline critical CSS and defer the rest

Read the full file on GitHub · 103 lines

Files

What ships with it

42 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.

Changes

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.

23d ago Changed · -7 lines · -51 tokens per session 18251c2a263a
1mo ago First seen · 110 lines · 63 tokens per session scan A 736bc3446b4f

Subscribe to this mod's changes

ui-design is a skill published in the GitHub repository PyModel/react-frontend-skills (38 stars, last pushed 3d ago), licensed MIT. It adds 12 tokens to every session and 1,105 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 88% identical to ui-design, differing in 14 lines, and is treated as a copy.

CSS and styling Claude Code Design and UX Frontend agent-skills ai-agents ai-coding-assistant codex cursor

lov-maintain-partners

Maintain the Skill Publisher website's partners section AND align partner logo rows on event posters / hero strips: reuse lov-find-logo for brand logo discovery, normalize collected logos to a 240px-tall content canvas (retina-ready), rasterize SVGs via rsvg-convert before normalizing (so SVG viewBox padding gets…

lovstudio/skills · 294 tokens

ui-design