Impeccable: a shared design vocabulary for you and your AI agent
Models learned from the same SaaS templates, so they keep returning Inter, purple-to-blue gradients and cards nested in cards. Impeccable grew out of Anthropic's frontend-design skill: it first records the product's facts in PRODUCT.md, then gives the agent 24 commands and a detector that flags common tells without calling a model.
Claude Code, Cursor, Codex, Gemini CLI, GitHub Copilot, OpenCode, Grok Build, Trae, Google Antigravity
What it does
One entry point, /impeccable, with 24 commands such as craft, shape, critique, audit, polish, bolder, quieter, distill, harden and typeset
/impeccable init inspects the project, asks only about real gaps and writes PRODUCT.md with audience, purpose, constraints and voice
62 deterministic detector rules; the CLI and the browser extension run them with no LLM and no API key
Live mode iterates on variants of an element in the browser, and /impeccable document builds DESIGN.md from existing code
Pin a command you use often: /impeccable pin audit gives you a standalone /audit
When to use it
The UI works but feels bland, and you need to know what to change in type, colour and layout
You want one pass over accessibility, performance and responsive behaviour before shipping
A checkout or settings form breaks on long text, errors or translations, which is what harden is for
Ask your agent
/impeccable critique landing: review the hierarchy and clarity of the home page
/impeccable harden checkout and cover error states and long strings in the payment form
/impeccable quieter on this dashboard, it shouts too much
Questions
How do I install Impeccable?
From the project root run npx impeccable install; it detects your agent folders and asks whether to install globally or per project. Then run /impeccable init in your tool.
Does Impeccable work in Cursor and Codex?
Yes. The README lists Cursor, Claude Code, Gemini CLI, Codex CLI, GitHub Copilot, OpenCode, Trae, Grok Build and more, with separate install steps for Codex and Cursor.
How is Impeccable different from frontend-design?
It started from Anthropic's frontend-design and adds PRODUCT.md setup, 24 commands and a 62-rule detector that runs without a model.
