StyleSeed: A design-rules engine so AI coding agents stop shipping generic-looking UI

Show HN: StyleSeed – a design-rules engine so AI agents stop building generic UI

bitjaru open-sourced StyleSeed, a design-rules engine for AI coding tools like Claude Code, Codex, and Cursor. It teaches design judgment rather than just generating code: 74 rules, 48 components, 7 brand skins (Toss, Stripe, Linear, Notion, Raycast, Arc, Vercel), a named motion system, and 15 /ss-* skills. MIT licensed, currently at 731 stars. The post doesn't detail how rules are enforced or how the motion system works in practice, but the structure aims to suppress the 'AI-generated' look in shipped UI.

Why it matters: Adding design constraints to AI coding tools addresses a real need, and 74 rules plus brand skins give this substance beyond a concept demo. Score capped because it's a fresh Show HN launch with no user feedback or real-world results yet — graded on tool completeness alone.