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Impeccable: Design skills for AI harnesses

Impeccable provides a suite of 18 AI commands that teach design best practices and steer code generation with shared vocabularies. It includes a detection engine, CLI tool, and Chrome extension to spot and fix design anti-patterns like low contrast, nested cards, and gradient text across live sites or codebases.
  • Detects 25 design anti-patterns (nested cards, purple gradients, low contrast, oversized icons) using a rules engine, no LLM required, via CLI or Chrome extension across HTML/CSS/JSX/Vue/Svelte or live URLs
  • Consolidated from 21 to 18 commands by merging overlapping ones (`/normalize`→`/polish`, `/arrange`→`/layout`, `/onboard`→`/harden`)
  • Internal evals measured font and color diversity gains when frontier models used the skill vs. without it
  • New `/shape` command adds discovery interviews, plus persona-driven critiques scored against Nielsen heuristics
Last saved Apr 12, 2026 · 6 min read
impeccable design anti patterns ai commands code generation accessibility