Impeccable

Updated 2026-04-08

Impeccable is a design skill and command package for AI harnesses. It extends Anthropic’s original frontend-design skill with curated anti-patterns, more precise design commands, and broader support across tools from Cursor to Claude Code and Codex CLI.

The Real Point

The useful insight is not simply that LLMs can be “prompted better.” It is that strong interface work needs an explicit design language: typography, hierarchy, color, rhythm, layout, and motion must be available as rules inside the harness. Without those rules, agents reliably produce generic and overloaded UIs.

What It Adds

  • a compact vocabulary of about twenty design commands
  • anti-patterns that block generic AI layouts
  • harness-agnostic installation across several agent tools
  • the idea that design quality depends not only on the model, but on the control layer

Framing

Impeccable matters because it closes a real gap. Models can produce many variants, but strong defaults remain hard. The package does not try to prompt taste into existence. It tries to embed design competence into the workflow itself.

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