Impeccable

The vocabulary you didn't know you needed. 1 skill, 23 commands, and curated anti-patterns for impeccable frontend design.

Quick start: Visit impeccable.style to download ready-to-use bundles.

Why Impeccable?

Anthropic's frontend-design was the first widely-used design skill for Claude. Impeccable started from there.

Every model trained on the same SaaS templates. Skip the guidance and you get the same handful of tells on every project: Inter for everything, purple-to-blue gradients, cards nested in cards, gray text on colored backgrounds, the rounded-square icon tile above every heading.

Impeccable adds:

• 7 domain reference files (view source). Typography, color, motion, spatial, interaction, responsive, UX writing. Load on every command, alongside a brand-vs-product register that adjusts the defaults.
• 23 commands. A shared design vocabulary with your AI: polish, audit, critique, distill, animate, bolder, quieter, and more.
• 27 deterministic anti-pattern rules plus a 12-rule LLM critique pass. CLI and browser extension run the deterministic ones with no LLM and no API key. Each is tied to specific design guidance the skill teaches against.

What's Included

The Skill: impeccable

A comprehensive design skill with 7 domain-specific references (view skill):

Reference	Covers
typography	Type systems, font pairing, modular scales, OpenType
color-and-contrast	OKLCH, tinted neutrals, dark mode, accessibility
spatial-design	Spacing systems, grids, visual hierarchy
motion-design	Easing curves, staggering, reduced motion
interaction-design	Forms, focus states, loading patterns
responsive-design	Mobile-first, fluid design, container queries
ux-writing	Button labels, error messages, empty states

23 Commands

All commands are accessed through /impeccable:

Command	What it does
/impeccable craft	Full shape-then-build flow with visual iteration
/impeccable teach	One-time setup: gather design context, write root PRODUCT.md and DESIGN.md
/impeccable document	Generate root DESIGN.md from existing project code
/impeccable extract	Pull reusable components and tokens into the design system
/impeccable shape	Plan UX/UI before writing code
/impeccable critique	UX design review: hierarchy, clarity, emotional resonance
/impeccable audit	Run technical quality checks (a11y, performance, responsive)
/impeccable polish	Final pass, design system alignment, and shipping readiness
/impeccable bolder	Amplify boring designs
/impeccable quieter	Tone down overly bold designs
/impeccable distill	Strip to essence
/impeccable harden	Error handling, i18n, text overflow, edge cases
/impeccable onboard	First-run flows, empty states, activation paths
/impeccable animate	Add purposeful motion
/impeccable colorize	Introduce strategic color
/impeccable typeset	Fix font choices, hierarchy, sizing
/impeccable layout	Fix layout, spacing, visual rhythm
/impeccable delight	Add moments of joy
/impeccable overdrive	Add technically extraordinary effects
/impeccable clarify	Improve unclear UX copy
/impeccable adapt	Adapt for different devices
/impeccable optimize	Performance improvements
/impeccable live	Visual variant mode: iterate on elements in the browser

Use /impeccable pin <command> to create standalone shortcuts (e.g., pin audit creates /audit).

Usage Examples

/impeccable audit blog           # Audit blog hub + post pages
/impeccable critique landing     # UX design review
/impeccable polish settings      # Final pass before shipping
/impeccable harden checkout      # Add error handling + edge cases

Or use /impeccable directly with a description:

/impeccable redo this hero section

Anti-Patterns

The skill includes explicit guidance on what to avoid:

• Don't use overused fonts (Arial, Inter, system defaults)
• Don't use gray text on colored backgrounds
• Don't use pure black/gray (always tint)
• Don't wrap everything in cards or nest cards inside cards
• Don't use bounce/elastic easing (feels dated)

See It In Action

Visit impeccable.style to see before/after case studies of real projects transformed with Impeccable commands.

Installation

Option 1: Download from Website (Recommended)

Visit impeccable.style, download the ZIP for your tool, and extract to your project.

Option 2: Copy from Repository

Cursor:

cp -r dist/cursor/.cursor your-project/

Note: Cursor skills require setup:

1. Switch to Nightly channel in Cursor Settings → Beta
2. Enable Agent Skills in Cursor Settings → Rules

Learn more about Cursor skills

Claude Code:

# Project-specific
cp -r dist/claude-code/.claude your-project/

# Or global (applies to all projects)
cp -r dist/claude-code/.claude/* ~/.claude/

OpenCode:

cp -r dist/opencode/.opencode your-project/

Pi:

cp -r dist/pi/.pi your-project/

Gemini CLI:

cp -r dist/gemini/.gemini your-project/

Note: Gemini CLI skills require setup:

1. Install preview version: npm i -g @google/gemini-cli@preview
2. Run /settings and enable "Skills"
3. Run /skills list to verify installation

Learn more about Gemini CLI skills

Codex CLI:

# Project-local
cp -r dist/agents/.agents your-project/
mkdir -p your-project/.codex
cp -r dist/codex/.codex/agents your-project/.codex/

# Or user-wide
mkdir -p ~/.agents/skills
cp -r dist/agents/.agents/skills/* ~/.agents/skills/
mkdir -p ~/.codex
cp -r dist/codex/.codex/agents ~/.codex/

GitHub Copilot:

cp -r dist/github/.github your-project/

Trae:

# Trae China (domestic version)
cp -r dist/trae/.trae-cn/skills/* ~/.trae-cn/skills/

# Trae International
cp -r dist/trae/.trae/skills/* ~/.trae/skills/

Note: Trae has two versions with different config directories:

• Trae China: ~/.trae-cn/skills/
• Trae International: ~/.trae/skills/

After copying, restart Trae IDE to activate the skills.

Rovo Dev:

# Project-specific
cp -r dist/rovo-dev/.rovodev your-project/

# Or global (applies to all projects)
cp -r dist/rovo-dev/.rovodev/skills/* ~/.rovodev/skills/

Qoder:

# Project-specific
cp -r dist/qoder/.qoder your-project/

# Or global (applies to all projects)
cp -r dist/qoder/.qoder/skills/* ~/.qoder/skills/

Usage

Once installed, use commands in your AI harness:

/audit           # Find issues
/normalize       # Fix inconsistencies
/polish          # Final cleanup
/distill         # Remove complexity

Most commands accept an optional argument to focus on a specific area:

/audit header
/polish checkout-form

Note: Codex uses skills here, not /prompts: commands. Open /skills or type $impeccable. Repo-local installs live in .agents/skills/; user-wide installs live in ~/.agents/skills/. GitHub Copilot uses .github/skills/. Restart the tool if a newly installed skill does not appear.

CLI

Impeccable includes a standalone CLI for detecting anti-patterns without an AI harness:

npx impeccable detect src/                   # scan a directory
npx impeccable detect index.html             # scan an HTML file
npx impeccable detect https://example.com    # scan a URL (Puppeteer)
npx impeccable detect --fast --json .        # regex-only, JSON output

The detector catches 24 issues across AI slop (side-tab borders, purple gradients, bounce easing, dark glows) and general design quality (line length, cramped padding, small touch targets, skipped headings, and more).

Supported Tools

• Cursor
• Claude Code
• OpenCode
• Pi
• Gemini CLI
• Codex CLI
• VS Code Copilot
• Kiro
• Trae
• Rovo Dev
• Qoder

Community & Ecosystem

Join the community and ecosystem conversations:

• GitHub Discussions: file bugs, request features, and help newcomers.
• Impeccable on npm: grab the CLI, follow releases, and star the package.
• Follow @pbakaus on Twitter for release notes, sample lint reports, and video highlights of new rules.

Contributing

See DEVELOP.md for contributor guidelines and build instructions.

License

Apache 2.0. See LICENSE.

The impeccable skill builds on Anthropic's original frontend-design skill. See NOTICE.md for attribution.

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Created by Paul Bakaus