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Impeccable is a design language for AI coding harnesses with a specific mission: stop them from shipping the same SaaS visual slop on every project. The author’s diagnosis is what every reviewer of AI-built frontends silently thinks — Inter for everything, purple-to-blue gradients, cards nested in cards, gray text on coloured backgrounds, the rounded-square icon tile above every heading. Models keep producing it because they were all trained on the same templates.

## One skill, 23 commands, 24 detected issues

Impeccable ships as a single skill with 23 commands and a detector that flags 24 specific issues. The detector splits the catch list into AI-slop tells (side-tab borders, purple gradients, bounce easing, dark glows) and general design quality (line length, cramped padding, small touch targets, skipped headings). Seven domain reference files — typography, color, motion, spatial, interaction, responsive, UX writing — load on every command, with a brand-vs-product register that adjusts defaults so a marketing page and a product surface don’t get the same treatment.

## A shared design vocabulary with the harness

The commands give you words the agent will understand the same way you do: polish, audit, critique, distill, animate, bolder, quieter. It started from Anthropic’s frontend-design skill and adds the anti-slop catalogue most teams currently maintain in their heads. It works with Cursor, Claude Code, Gemini CLI, Codex CLI, and the other major harnesses.

## Why it matters

“AI-built UI” is becoming a category, and the visual sameness is the dead giveaway. Codifying the anti-patterns into a runnable detector — rather than hoping the next model release fixes it — is how design discipline survives the agent era.