Impeccable

What it does

Impeccable is a design skill for AI coding agents. It gives agents design expertise so they can build interfaces from scratch, improve existing ones, and follow a design system. It installs through a CLI that adapts to your coding tool, and it includes a design hook that checks UI edits and reports issues back to the agent.

Impeccable is a skill you install into an AI coding agent to improve the design of the interfaces it produces. The homepage says it gives your agent the design expertise to build from scratch, improve what you have, and stay true to your design system. It lists commands such as /polish, /distill, and /clarify, and shows a detector that catches defaults agents keep reaching for. The design hook runs in code, without an AI model or API key, and reports findings back to your agent. The site says the CLI adapts Impeccable to your coding tool, and that it is built into the GitHub Copilot app. Several testimonials on the page call it free, but the page does not state a formal pricing model, so treat the cost as unclear. The page also does not say whether an account is required, whether the source is open, or whether there is a public API. Because it runs inside a host coding tool, what you get depends on that tool and its skill format.