AI-Generated Architecture Diagrams: Meet Diagram Design
When developers use AI coding assistants (such as Claude Code, Codex, or Pi) to document system architectures, the resulting visual output is often disappointing. Standard AI models rely heavily on basic Mermaid text syntax, producing generic "rounded-box" flowcharts that require manual redrawing before presentation to stakeholders or inclusion in documentation.
diagram-design is an open-source skill developed by Cathryn Lavery to solve AI diagram quality. Designed as a native plugin for AI coding agents, diagram-design enables models to generate self-contained, editorial-quality SVG and HTML diagrams tailored to your brand's design system.
What is Diagram Design?
diagram-design functions as a design engine for AI coding clients. Instead of outputting plain text graph definitions, diagram-design equips your AI agent with rules, typography hierarchies, and layout geometry to generate polished vector graphics.
Key Core Features
diagram-design goes beyond basic flowcharts. It supports over 30 distinct visual formats, including:
- System Architecture & Cloud Topology Maps
- Sequence & State Diagrams
- Radar & Venn Diagrams
- Sankey & Financial Flow Charts
- Gantt & Project Timelines
2. Automatic Brand Color & Font Scraping
To ensure diagrams align with your organization's visual brand, diagram-design allows AI agents to inspect a target website URL. The tool automatically extracts brand palette hex codes, font families, and container styles, applying them directly to generated SVGs.
3. Zero Build Step (Standalone SVG + HTML)
Generated diagrams are saved as portable, self-contained SVG and HTML files. They require no external bundlers, canvas runtimes, or rendering libraries—allowing developers to inspect them instantly in any browser.
4. Native AI Agent Marketplace Plugin
diagram-design integrates directly into modern terminal agents:
# Install in Claude Code
/plugin marketplace add cathrynlavery/diagram-design
/plugin install diagram-design@diagram-design
# Install in Codex
codex plugin marketplace add cathrynlavery/diagram-design
codex plugin add diagram-design@diagram-design
Conclusion
By elevating AI visual outputs from basic text definitions to publication-ready vector graphics, diagram-design bridges the gap between software engineering and technical design. It empowers developers to generate presentation-grade architecture diagrams effortlessly.
Want to upgrade your AI diagrams? Check out the Diagram Design GitHub Repository.
