Hallmark Design Skill

Install

Paste this into an agent terminal such as Claude Code to install it.

npx skills add nutlope/hallmark

Hallmark is a design skill that prevents the mass-produced web aesthetic commonly associated with AI-generated work.

Four operating modes: Supports Build for generating UI, Study for analyzing design structure, Audit for diagnosing anti-patterns only, and Redesign for rebuilding layouts while preserving the brand.
57 validation gates (anti-pattern prevention): Automatically blocks purple and pink gradients, single-font Inter usage, formulaic centered layouts, and repetitive card grids.
Eight design principles: Maintains strict system standards including font pairing, a single OKLCH anchor color, spacing in multiples of four, asymmetric layouts, and safeguards against fabricated statistics.

An agent tool that installs design references and skills

A Claude Code plugin that remembers interface design rules