impeccable

Impeccable

Design guidance for AI coding agents. 1 skill, 23 commands, live browser iteration, and 45 deterministic detector rules for AI-generated frontend design.

Quick start: From your project root, run npx impeccable install, then run /impeccable init inside your AI coding tool. Full docs: impeccable.style.

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:

• One setup flow. /impeccable init writes PRODUCT.md and offers DESIGN.md, so later commands know the audience, brand/product lane, voice, anti-references, colors, type, and components.
• 23 commands. A shared design vocabulary with your AI: polish, audit, critique, distill, animate, bolder, quieter, and more.
• 45 deterministic detector rules plus LLM-only critique checks. The CLI and browser extension run the deterministic rules with no LLM and no API key.

What's Included

The Skill: impeccable

The skill installs as one command:

/impeccable <command> <target>

Start every new project with:

/impeccable init

init asks whether the surface is brand (marketing, landing, portfolio) or product (app UI, dashboard, tool), then writes design context that every later command reads.

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 install