Generate non-templated UI with anti-slop design rules
Hallmark is a design skill for Claude Code, Cursor, and Codex that builds UI meant not to look AI-generated, with 57 slop-test gates.
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Why it matters
Generate production-ready HTML/CSS user interfaces that avoid AI-generated design patterns through a rule-set of 57 slop-test gates, 20 themes, and macrostructure selection that makes each output feel hand-crafted rather than template-derived.
Outcomes
What it gets done
Build new UI from briefs by selecting appropriate macrostructure and theme
Audit existing code against anti-pattern rules and provide punch-list feedback
Redesign existing sites by extracting content and rebuilding with different structure
Extract design DNA from screenshots or URLs to create portable design specifications
Install
Add it to your toolbox
Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.
Run in your project directory:
curl -fsSL https://spark.entire.vc/get/nutlope-hallmark | bash After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.
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Overview
Hallmark
Hallmark is a design skill for Claude Code, Cursor, and Codex that generates UI meant not to look AI-generated, running 57 slop-test gates and a pre-emit self-critique per brief. It also audits existing code, redesigns a page's structure while keeping its brand, and extracts a design's DNA from a screenshot or URL. Use the default verb to build new UI from a brief, audit to score existing code, redesign to rebuild structure while keeping brand and copy, and study to extract design DNA from a reference.
What it does
Hallmark is a design skill for Claude Code, Cursor, and Codex that generates UI intended not to look AI-generated. For a brief, it picks a macrostructure, applies one of twenty-one themes, runs fifty-seven slop-test gates plus a pre-emit self-critique, and deliberately avoids the on-distribution defaults that LLMs are trained toward - the goal is that two pages built from two different briefs feel like different sites, not colour-swapped versions of the same template. Each generated page is self-contained HTML and CSS, stamped with its macrostructure in a CSS comment. It is made by Together AI and is MIT licensed.
When to use - and when NOT to
Use the default verb to build new UI from a brief - it picks a macrostructure, applies the rule-set, and runs the slop test before handing the result back. Use hallmark audit <target> to score existing code against the anti-patterns without making edits, hallmark redesign <target> to keep an existing page's copy, information architecture, and brand while rebuilding its structure with a different visual fingerprint, and hallmark study <screenshot | URL> to extract macrostructure, type-pairing, and colour anchor ("DNA") from a design you admire. The study verb explicitly refuses to produce pixel-clones or reproduce paid templates - it is for extracting a design language, not copying a specific page.
Inputs and outputs
Input is a design brief for the default build verb, an existing codebase or file for audit or redesign, or a screenshot or URL for study. Output is self-contained HTML and CSS for the build and redesign verbs, a punch list of anti-pattern violations with no edits made for audit, and either extracted design DNA or a portable design.md handoff file for study - the design.md output can be handed to other AI tools.
Integrations
npx skills add nutlope/hallmark
Re-run the command any time to update. Alternatively, copy SKILL.md and its references/ directory directly into a tool's skills location: ~/.claude/skills/hallmark/ for Claude Code, .cursor/rules/hallmark.mdc (the body of SKILL.md, without frontmatter) for Cursor, or ~/.codex/skills/hallmark/ (personal) or .codex/skills/hallmark/ (project-scoped) for Codex. The rule-set itself lives in SKILL.md and references/, with worked examples in docs/recipes.md and docs/study-examples.md, and the Custom-theme protocol, used when a brief's creative intent doesn't fit any catalog theme, documented separately in skills/hallmark/references/custom-theme.md.
Who it's for
Developers using Claude Code, Cursor, or Codex who want generated UI - landing pages, product pages, marketing sites - that doesn't read as templated AI output, and who want an audit mode to check existing code against the same anti-pattern rules before shipping it.
Source README
Hallmark
A design skill for Claude Code, Cursor, and Codex that refuses to look AI-generated.
Live demo → · twenty-one themes · four verbs · press T to cycle.
Made by Together AI.
Hallmark picks a macrostructure for the brief, dresses it in one of twenty-one themes, runs fifty-seven slop-test gates plus a pre-emit self-critique, and refuses the on-distribution defaults every LLM was trained into. Two pages by Hallmark for two different briefs feel like different sites, not colour-swaps of the same template.
Four verbs
| Verb | What it does |
|---|---|
| (default) | Build new UI. Picks a macrostructure, applies the rule-set, runs the slop test before handing back. |
hallmark audit <target> |
Score existing code against the anti-patterns. Punch list, no edits. |
hallmark redesign <target> |
Throw out the structure, keep copy + IA + brand, rebuild with a different fingerprint. |
hallmark study <screenshot | URL> |
Extract the DNA from a design you admire: macrostructure, type-pairing, colour anchor. Refuses pixel-clones and paid templates. Optionally emits a portable design.md for handoff to other AI tools. |
Different briefs, different shapes
Each generated from a different brief. The skill picks the theme, structure, and craft to fit each one, not from a template.
 |
 |
 |
 |
| Bubble Sourdough app · Hum |
Distil Extraction API · Cobalt |
Cold Snap Record label · Carnival |
Cinder AI tool · Lumen |
 |
 |
 |
 |
| Ferns & Fathom Tea menu · Custom |
Hollowback Apiary Honey farm · Garden |
Off-Register Print fair · Riso |
Press Quaternary Type studio · Custom |
 |
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 |
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| Tally SaaS · modern-minimal |
Wayfare Travel · atmospheric |
NAJM Fashion brand |
Hyperlane Dev infrastructure |
Each page is self-contained HTML + CSS, stamped with its macrostructure in the CSS comment. Browse the full set at usehallmark.com or under site/_tests/.
Custom NEW
When a brief carries creative intent that no catalog theme fits, Hallmark switches to Custom and designs the page from scratch: a made-to-measure palette, type, and layout. Same 57 slop-test gates, no template underneath.
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| The Cascadia Nightjar Sleeper-train ticket · Custom |
The Mend Assembly Repair-café broadsheet · Custom |
It stays a quiet branch; vanilla briefs never see it. The protocol lives in custom-theme.md.
Install
npx skills add nutlope/hallmark
Re-run any time to update. Or copy SKILL.md + references/ into:
- Claude Code:
~/.claude/skills/hallmark/ - Cursor:
.cursor/rules/hallmark.mdc(body ofSKILL.md, no frontmatter) - Codex:
~/.codex/skills/hallmark/(personal) or.codex/skills/hallmark/(project-scoped)
The rule-set lives in SKILL.md and references/. Worked examples in docs/recipes.md and docs/study-examples.md.
FAQ
Common questions
Discussion
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