Hallmark: Anti-AI Design Skill for Claude, Cursor, Codex

Together AI released Hallmark, a design skill built for Claude Code, Cursor, and Codex that generates UI code with explicit guardrails against recognizable AI-generated patterns. The tool's core insight is that language models tend to converge on the same structural defaults—what the documentation calls "on-distribution defaults"—so Hallmark instead picks a macrostructure for each brief, applies one of twenty available themes, runs fifty-seven anti-pattern gates (the "slop-test gates"), and performs a pre-emission self-critique. The result is that two pages generated from different briefs should look visually and structurally distinct, not like colour-swapped instances of the same template.

The skill exposes four verbs. The default builds new UI from a brief, picking theme, structure, and craft to fit the request. `hallmark audit <target>` scores existing code against anti-patterns and returns a punch list without edits. `hallmark redesign <target>` discards the structure but preserves copy, information architecture, and brand, then rebuilds with a different fingerprint. `hallmark study <screenshot | URL>` extracts design DNA—macrostructure, type-pairing, colour anchor—from a design the user admires, refusing pixel-clones and paid templates; it can optionally emit a portable design.md for handoff to other AI tools.

Hallmark ships with twenty named themes (including Bubble, Carnival, Garden, Riso, modern-minimal, and atmospheric) and a Custom mode. When a brief carries creative intent that no catalog theme fits, Custom switches to made-to-measure design: a palette, type, and layout built from scratch, still subject to the fifty-seven anti-slop gates. Custom designs remain hidden unless the brief explicitly requests them; vanilla briefs do not see the Custom branch. The protocol for custom design lives in custom-theme.md.

Installation is straightforward: `npx skills add nutlope/hallmark` downloads and installs the skill. For Cursor, developers copy the body of SKILL.md into .cursor/rules/hallmark.mdc. For Claude Code or Codex, place the files in the respective skills directories. The rule-set, worked examples, and study cases are documented in SKILL.md, docs/recipes.md, and docs/study-examples.md. Hallmark is released under the MIT license and available now at usehallmark.com, with the full test set browsable under site/_tests/.

Hallmark addresses a growing frustration in AI-assisted design: the homogeneity of LLM-generated layouts. Because large language models are trained on common web design patterns, they tend to produce variations on the same structural templates, differing mainly in colour and typography—a phenomenon the tool's makers call "slop." Hallmark tackles this by imposing a rule-set with fifty-seven anti-pattern gates that force structural variation. The tool's twenty themes and Custom mode ensure that each brief receives a distinct macrostructure rather than a recoloured copy of a single underlying template.

The four verbs (build, audit, redesign, study) give developers different entry points. A designer might use study to extract the DNA of an admired design, then fold that into a new brief; or use redesign to overhaul the structure of existing code while preserving its copy and information architecture. The audit function surfaces anti-patterns without proposing edits, leaving judgment to the human. All four enforce the same anti-slop rule-set, so the output should feel intentional and varied rather than templated.

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