Hallmark: An Anti-AI-Slop Design Skill for Coding Agents Hits 12K GitHub Stars

Short summary

Hallmark, an anti-AI-slop design skill for Claude Code, Cursor, and Codex, hit 12K+ GitHub stars and became the #1 trending repo. Built by Hassan El Mghari at Together AI, it runs 57 deterministic quality gates on AI-generated frontend pages across six axes including typography, color, and motion. The tool offers four verbs: Build, Audit, Redesign, and Study — shifting AI coding value from model capability to quality control.

• •Hallmark is a SKILL.md instruction file that constrains AI coding agents' frontend output
• •57 binary quality gates catch typography, color, card uniformity, and motion slop tells
• •Four verbs: Build (generate with gates), Audit (score existing code), Redesign (rebuild visual structure), Study (extract design DNA)

Generated with AI, which can make mistakes.