Diagram Plugin Hits 1,616 Stars Betting Against Mermaid's Look

The Claude Code plugin diagram-design hit number one on GitHub Trending on August 12, gaining 1,616 stars in 24 hours. The repo has climbed to 8,520 stars and 560 forks total. It's a direct shot at the bland rounded boxes that show up whenever a developer asks an LLM to draw a diagram.

Installation takes one command, /plugin marketplace add cathrynlavery/diagram-design, and the license is MIT. Instead of an auto-layout flowchart engine, it ships 27 editorial diagram types as self-contained HTML and SVG. Each one enforces a single accent color, one or two focal elements, no drop shadows, and automatic WCAG AA contrast checks, per its README.

Existing Mermaid and draw.io files import and redraw automatically inside the plugin, and a 60-second scan of a website pulls out a brand palette.

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Whether the one-accent-color rule holds past fifty diagrams in an actual technical spec, not a clean README example, is untested. The GitHub listing doesn't say what happens to the WCAG contrast check once a diagram gets that dense.