3 tagged diagram-as-code, measured the same way as everything else here.
Skill Claude CodeCodex
Creates, edits, reviews, and regenerates C4 architecture diagrams written with goa.design/model and the mdl CLI. Use when changing Model DSL, model.go or views.go files, system landscape, context, container, component, dynamic, or deployment views, element relationships, boundaries, layout, or generated SVG diagrams.
Skill Codex
Draw math geometry diagrams as PNG or SVG images using the Geometry DSL compiler. Use when the user asks to draw, shade, label, illustrate, or visually explain geometry, recreate a reference diagram, produce or repair Geometry DSL, or diagnose a diagram that looks wrong. Write DSL source, validate it with the bundled…
Skill Claude CodeCodex
Professional Excalidraw diagram designer. Designs system architectures, tech roadmaps, 4-quadrant deep dives, pipelines, and sequence diagrams using excalidraw-mcp tools with senior aesthetic standards.