impeccable

Impeccable is a design guidance system for AI coding agents. It offers 23 slash-command shortcuts and 61 deterministic detector rules to improve AI-generated frontend designs, targeting the repetitive patterns that emerge when models are trained on similar SaaS templates. The tool works as a skill or plugin across multiple AI coding harnesses including Claude Code, Cursor, Codex, GitHub Copilot, Gemini CLI, Grok Build, Hermes Agent, Pi, OpenCode, DeepSeek Harness, Trae, Rovo Dev, Qoder, Google Antigravity, and Mistral Vibe. A single `/impeccable init` command captures durable product context into `PRODUCT.md`, then subsequent commands operate on a shared design vocabulary. Key commands include: `audit` for technical quality checks (accessibility, performance, responsiveness), `critique` for UX design review, `polish` for final-shipping pass, `animate` for purposeful motion, `colorize` for strategic color introduction, `typeset` for typography fixes, `layout` for spacing and visual rhythm, `harden` for error handling and edge cases, `distill` for simplification, and `live` for browser-based visual iteration. The project includes a standalone CLI (`npx impeccable detect`) that runs 61 deterministic anti-pattern checks without requiring an AI model or API key. It can scan directories, HTML files, or live URLs. A browser extension is also available for inspecting deployed sites. Installation is done via `npx impeccable install` which auto-detects installed harnesses and configures native hooks where supported. Hooks run design detection on UI file edits and surface findings back into the agent flow. The engine ships as a self-contained binary; Node is only required for the `npx` installer shim.