Agent skill that has your coding agent draw 45 types of diagram as one self-contained HTML and SVG file, styled to match your brand.
Free tool inAgent skills and plugins
Diagram Design at a glance
Checked 18 Oct 2026Diagram Design is an agent skill: you describe a diagram (architecture, flowchart, sequence, quadrant and 42 other types) and the agent writes one HTML file with inline SVG in a fixed editorial style, optionally matched to your site's colours and fonts. It can redraw Mermaid, draw.io and Excalidraw files and export SVG or PNG (PNG needs Python Playwright). Output is not an editable diagram source. Needs a coding agent with a paid plan or key. MIT licence. Free add-on; it does not replace a paid product.
RepoQuarry. “Diagram Design.” Checked 18 Oct 2026. https://repoquarry.dev/projects/diagram-designWhat it replaces
Nothing people pay for: it’s a free tool, listed because people search for it. Find similar projects in Agent skills and plugins.
Facts, with sources
Every answer links to where we found it. We read the documentation; we did not install it.
The output is one .html file that opens double-clicked, offline, with no network requests beyond Google Fonts, and none at all with system fonts.github.com · diagram-design#readme ↗ 3d ago
Permission is hereby granted, free of charge, to any person obtaining a copy of this softwaregithub.com · LICENSE ↗ 3d ago
Works with any host that reads Agent Skills, including Cursor, Claude Code, Codex, GitHub Copilot, Gemini CLI, Cline, Windsurf and Ampgithub.com · diagram-design#install ↗ 3d ago
Where symlinks are unavailable (Windows without Developer Mode) the CLI falls back to copies and reports which roots it copied.github.com · diagram-design#install ↗ 3d ago
npx skills add cathrynlavery/diagram-designgithub.com · diagram-design#install ↗ 3d ago
No licence changes since we started watching. Licence watch: follow Diagram Design and we email you if its licence terms change.
Growth and activity in detail
Is it popular, and is anyone still working on it? From GitHub.
- Actively maintained69 people committing, active 10 of the last 12 weeks.
69 people committing in the last 12 months · 84 pull requests merged in 30 days · 66 issues opened, 70 closed in 30 days
Stars over time
Building history+1,566 stars since 18 Oct 2026. The 7-day comparison and the trend label start once there is a full week of daily counts.
- Diagram Design
Tracked daily since 18 Oct 2026. Dashed history: estimated from public records of when people starred the repo. Lines connect observations only; gaps contain no measured points.
Commits per week, last 52 weeks
active 10 of the last 12 weeksUp 6220% on the 12 weeks before.
Where these numbers come from
- Stars, forks, releases: GitHub's public API, fetched every night (last fetch today).
- Star history: counted every night since 18 Oct 2026.
- Commits and people committing: GitHub's repository statistics, counted weekly. Names are never stored.
- Pull requests and issues: counted from GitHub for the last 30 days.
- Stars show popularity, not quality. The facts below are checked separately, by reading the project's own documentation. How we check.