Together AI's hallmark Ships 57 Validation Checks and Four Modes to Stop Agent-Built UI From Looking AI-Generated — +4,758 Stars

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hallmark is a design skill for Claude Code, Cursor and Codex that runs 57 validation checks plus self-critique against common AI-generated patterns, selecting from 20 themes and applying macrostructures contextually so different briefs produce genuinely different layouts rather than template variations. Beyond building new UI it offers three additional modes: `hallmark audit` scores existing code against anti-patterns, `hallmark redesign` restructures while preserving content, and `hallmark study` extracts design DNA from existing work. Installs via `npx skills add nutlope/hallmark` or by copying into `~/.claude/skills/`, `.cursor/rules/` or `~/.codex/skills/`.