
Impeccable
A design language with 24 commands and 59 detector rules for AI-built UI.
About
Impeccable turns AI design guidance into an operable toolchain: one skill plus 24 commands (polish, audit, critique, animate, bolder, quieter...) and 59 deterministic detector rules that catch AI-design tells without an LLM. /impeccable init records durable product truth in PRODUCT.md so later commands stay grounded. Install with npx impeccable install from your project root, then /impeccable init in your tool; it supports Claude Code, Cursor, Codex, Gemini CLI, Copilot, and more. It grew out of Anthropic's frontend-design skill and adds the setup flow and enforcement layer that skill lacks. Note the CLI downloads a self-contained engine binary on first run.
What it can do
- 24 design commands; 59 deterministic detector rules; PRODUCT.md/DESIGN.md workflow; live browser iteration; multi-harness skill installs.
Setup
npx impeccable install from the project root, then /impeccable init inside your AI coding tool.
Prerequisites
Node.js for the npx installer; the engine binary downloads on first run.
Use cases
Works with
Trust score — 8/10
Scored 8/10 (verified tier, metrics-v1). Evidence: Repo read live: 80,454 stars, Apache 2.0, install command verbatim from README.; 24 commands, 59 detector rules, /impeccable init PRODUCT.md flow confirmed.; Engine-binary download on first run and multi-harness support captured..
★ 80,454 GitHub stars
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.