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 init`	One-time setup: gather design context, write PRODUCT.md and DESIGN.md, configure live mode, recommend next steps
`/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: CLI installer (Recommended)

From the root of your project, run:

npx impeccable skills install

This auto-detects your harness and writes the build compiled for it to the right location (.claude/skills/, .cursor/skills/, etc.). Works with Cursor, Claude Code, Gemini CLI, Codex CLI, and every other supported tool. Reload your harness afterward.

Claude Code users can alternatively install the plugin with /plugin marketplace add pbakaus/impeccable. The general-purpose npx skills add pbakaus/impeccable also works, though it installs one shared build for all harnesses rather than the one compiled for yours.

Option 2: Download from Website

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

Option 3: Copy from Repository

Cursor:

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

Note: Cursor skills require setup:

Switch to Nightly channel in Cursor Settings → Beta

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:

Install preview version: npm i -g @google/gemini-cli@preview

Run /settings and enable "Skills"

Run /skills list to verify installation

Learn more about Gemini CLI skills

Codex CLI:

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

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

The asset-producer subagent ships nested inside the skill's own agents/ folder, which Codex auto-discovers. No separate .codex/agents/ copy is needed.

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, every command runs through the single /impeccable skill:

/impeccable audit        # Find issues
/impeccable polish       # Final cleanup
/impeccable distill      # Remove complexity
/impeccable critique     # Full design review

Type /impeccable alone to see the full command list.

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

/impeccable audit the header
/impeccable polish the checkout form

If you reach for one command often, pin it with /impeccable pin audit to get /audit as a standalone shortcut.

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

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.

Created by Paul Bakaus