Impeccable

Design skill for AI coding agents: 23 slash commands and 59 detector rules

Tier S · Best in classAgent SkillToolChecklistgithub.com

Impeccable is a design-guidance skill that installs into an AI coding harness and gives it a shared design vocabulary. It ships one skill with 23 slash commands (init, craft, shape, critique, audit, polish, bolder, quieter, distill, harden, onboard, animate, colorize, typeset, layout, delight, overdrive, clarify, adapt, optimize, live, document, extract) plus 59 deterministic detector rules that flag AI design tells such as Inter-for-everything, purple-to-blue gradients, cards nested in cards, gray text on colored backgrounds and bounce easing. `/impeccable init` writes PRODUCT.md and DESIGN.md so every later command reads the same project context. It targets developers who let an agent build the frontend and want the output to stop looking machine-made.

Install

npx impeccable install

For an agent

Install this at project start, before any UI exists: run `npx impeccable install` then `/impeccable init` so PRODUCT.md and DESIGN.md exist for every later command to read. It is the strongest general-purpose replacement for Anthropic's frontend-design skill and it composes with a brand-specific DESIGN.md from awesome-design-md or hue - Impeccable supplies craft rules, the DESIGN.md supplies the visual identity. Watch out that it ships no components and no code: it will not build a design system for you, it critiques and reshapes what you already generated, and the 59 detector rules run deterministically via `npx impeccable detect src/` with no LLM, so use that in CI rather than burning tokens on a critique pass.

Why it is here. It is the most-adopted design skill for AI coding harnesses and the clearest codification of what AI-generated UI gets wrong, expressed as rules an agent can actually execute.

Install command, framework, licence and component list.

Facts

License: Apache 2.0
Pricing: Free, Open source, Freemium
Framework: Not applicable
Styling: Not applicable
Distribution: Agent skill / rules pack, CLI installer, npm package, GitHub repository, Browser extension
Platform: Web, Platform agnostic
Content type: Prompts, Prose / writing, Code
Agent readiness: Agent skill or rules pack, CLI installable, Structured documentation, Readable open source
Accessibility: Contrast checked, Accessible
Maturity: Actively maintained
Pricing detail: Skill, CLI and Chrome extension are free and Apache-2.0. The impeccable.style site markets a Pro tier for the 'design worlds' deck (177 worlds, growing weekly); no public price listed.
GitHub stars: 59,372
Package: impeccable

Helps you build

Homepage Onboarding Web App Empty State Features

Notable for

23 slash commands
59 deterministic detector rules
works across 14+ agent harnesses
no-LLM CI detector
Chrome detector overlay

Provenance

Verified 2026-08-15. HTTP 200. https://github.com/pbakaus/impeccable, https://raw.githubusercontent.com/pbakaus/impeccable/main/README.md, https://api.github.com/repos/pbakaus/impeccable, https://impeccable.style

Also in Agent Design Tooling

github.comTier S