Hallmark is a design skill for Claude Code, Cursor, and Codex that prevents LLM-generated UIs from looking like typical AI output. It selects a macrostructure for a given brief, dresses it in one of twenty-one themes, and runs a suite of slop-test gates and a pre-emit self-critique to refuse on-distribution defaults. Different briefs produce fundamentally different shapes and structures rather than colour-swaps of a single template.
- Includes a `study` verb that extracts design DNA from a screenshot or URL
- Offers a Custom route that designs from first principles when no catalogue theme fits the brief