Nutlope/hallmark
- Source
- GitHub
- First trending
- Category
- Design and UI
- GitHub stars
- 28,741
- Main language
- CSS
This page introduces an external open-source repository. It is not an HDATF product.

What it does
Hallmark is a design skill for Claude Code, Cursor and Codex that builds UI while avoiding generic AI-generated looks. It picks a page structure and theme, runs slop-test checks before output, and can audit, redesign or study existing designs.
How it helps ATF
Its check-before-output step is a reference for how Harness could test a result against written rules before handing it back. The audit mode, which lists problems without editing, is also worth comparing for reviewing ATF Works screens.
License
MIT Permissive. Commercial use and changes are allowed if the copyright notice is kept.
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Only repositories in the ranked Trendshift lists are included, and the lists are used only to find candidates. We do not copy their ranks. Descriptions, licenses and star counts come from each GitHub repository. The notes are our own reading. We have not tested these projects, and a place on a trending list does not prove quality.