Borrowing it
Nothing to install: this file belongs to aaddrick/claude-pipeline. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/aaddrick/claude-pipeline/main/.claude/skills/ui-design-fundamentals/SKILL.mdgit clone --depth 1 https://github.com/aaddrick/claude-pipelineWrote 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/aaddrick/claude-pipeline/ui-design-fundamentals)<a href="https://agentmods.dev/skills/aaddrick/claude-pipeline/ui-design-fundamentals"><img src="https://agentmods.dev/badge/skills/aaddrick/claude-pipeline/ui-design-fundamentals/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/aaddrick/claude-pipeline/ui-design-fundamentals"><img src="https://agentmods.dev/badge/skills/aaddrick/claude-pipeline/ui-design-fundamentals.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00000 | $0.01043 |
| Opus 5 | $0.00000 | $0.00522 |
| Sonnet 5 | $0.00000 | $0.00209 |
| Haiku 4.5 | $0.00000 | $0.00104 |
Grade A, and why
ui-design-fundamentals 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 11d 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 — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
---
name: ui-design-fundamentals description: Use when designing UI components, reviewing frontend code, choosing colors, spacing, typography, or layout. Use when CSS looks off, components feel unbalanced, or accessibility is unclear.
UI Design Fundamentals
Overview
Reference guide for designing effective, accessible user interfaces. Core principle: Less is more - every element should serve a purpose.
Core Principles
1. The 8-Point Grid
All spacing, margins, and dimensions use multiples of 8px. Use 4px for fine control.
2. Visual Hierarchy
Guide attention through size, weight, color, and spacing. Most important = largest/boldest.
3. Consistency
Same patterns throughout. Create style guide first, then components.
4. Accessibility First
- Minimum 4.5:1 contrast for text
- 44px minimum tap targets (48px preferred)
- Never rely on color alone
5. Mobile First
Design smallest screen first. Easier to scale up than down.
6. Grayscale First
Focus on layout and hierarchy before adding color.
Quick Reference Tables
Spacing Scale (8pt grid)
| Value | Use |
|---|---|
| 8px | Tight gaps, icons |
| 16px | Standard padding |
| 24px | Related groups |
| 32px | Card padding |
| 48px | Section gaps |
| 64-96px | Major sections |
Contrast Requirements (WCAG)
| Element | Minimum |
|---|---|
| Small text | 4.5:1 |
| Large text (>24px) | 3:1 |
| UI components | 3:1 |
| AAA (ideal) | 7:1 |
Tap Targets
| Platform | Minimum |
|---|---|
| iOS | 44x44px |
| Android | 48x48px |
| Desktop | 32-40px height |
Frame Sizes
| Platform | Size |
|---|---|
| iOS | 375x812 |
| Android | 360x800 |
| Desktop | 1440x1024 |
| Large desktop | 1920x1024 |
Reference Files
Detailed guidance by topic:
| File | Topics |
|---|---|
| grid-and-spacing.md | 8pt grid, layouts, margins, gutters, box model, alignment |
| typography.md | Type scales, font weights, line heights, hierarchy |
| colors.md | Color theory, WCAG contrast, psychology, tints/shades, dark mode |
| shadows-and-depth.md | Elevation, shadow techniques, gradients |
| buttons.md | Anatomy, states, hierarchy, icons, placement |
| forms.md | Labels, validation, input types, multi-step, accessibility |
| navigation.md | Nav bars, sticky headers, mobile tab bars, breadcrumbs |
| hero-sections.md | Above the fold, CTAs, social proof, F/Z patterns |
| cards.md | Anatomy, spacing, types, consistency |
| modals-and-dropdowns.md | Modal windows, dialogs, dropdown patterns |
| search.md | Search inputs, autocomplete, recent searches, no-results |
| pricing.md | Pricing sections, psychology, conversion optimization |
| style-guides.md | Component libraries, design systems, documentation |
What ships with it
13 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.
- 11d ago First seen · 119 lines · 0 tokens per session scan A e8de3bdaef3c
ui-design-fundamentals is a skill published in the GitHub repository aaddrick/claude-pipeline (128 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,043 tokens. 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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