Hallmark: Stop AI-Generated UI Slop in One Command in 2026

TL;DR Summary

AI coding agents default to the same predictable UI: Inter font, purple gradient, nested cards — because they trained on the same templates

Hallmark is a 1.8k-star, MIT-licensed design skill that gives AI agents actual design taste through 4 verbs (Build, Audit, Redesign, Study) and 22 unique themes

Install in one line: npx skills add nutlope/hallmark — works with Claude Code, Cursor, and Codex