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.

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.

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

All commands are accessed through /impeccable:

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

/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

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)

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

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.

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

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/

# 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/

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.

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).

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

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.

See DEVELOP.md for contributor guidelines and build instructions.

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