impeccable-deterministic-design-scanner-zero-llm-cost

The impeccable npm package provides a 3,590-line JS detection engine with 25 rules (13 AI-slop tells + 12 quality rules) that runs entirely without LLM calls. It can be wired as a PostToolUse hook on Write/Edit to .html/.css/.tsx/.jsx files to surface design violations inline at zero token cost. Slash command /design-audit <file|url> enables on-demand full scanning.