Originally published on rohitraj.tech
Every site your AI coding agent builds looks the same: Inter font, a purple gradient, six identical cards, a bounce on every hover. Hallmark — a design skill for Claude Code, Cursor, and Codex that hit 12.4k stars this week — runs 57 "slop-test gates" to refuse those defaults before the code is emitted. Here is what AI slop actually is, exactly how Hallmark works, the four verbs with real commands, how it stacks up against frontend-design, Impeccable, and Stitch, and when a skill still will not save you from a bad design.
Read the full version with code samples, diagrams, and architecture details: The Anti-AI-Slop Design Skill: How Hallmark Fixes Generic AI UI in 2026
More engineering notes: rohitraj.tech/en/notes
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