Claude Code Learns to Design: Diagram Design Skill Brings Editorial-Quality Diagrams to AI-Powered Development

Anthropic's Claude Code now has a design discipline. A new open-source skill called Diagram Design teaches Claude to generate professional, brand-matched diagrams as self-contained HTML and SVG files—moving far beyond the generic, shadow-laden output that tools like Mermaid are known for. The diagram-design repository, created by Cathryn Lavery, has grown to over 31,700 GitHub stars and covers 42 distinct diagram types including architecture layouts, flowcharts, sequence diagrams, entity-relationship models, swimlanes, timelines, organizational charts, Sankey flows, Wardley maps, and deployment schematics.