Installs into .claude/skills of the current project.
Are you the author of Diagram Gen?
Add the live security badge to your README. It updates with every re-scan.
[](https://www.skillsdirectory.com/skills/sundial-org-diagram-gen)
---
name: diagram-gen
description: Generate Mermaid diagrams from your codebase. Use when you need architecture visualizations.
---
# Diagram Generator
Architecture diagrams are always out of date because nobody maintains them. This tool reads your code and generates accurate Mermaid diagrams automatically.
**One command. Zero config. Just works.**
## Quick Start
```bash
npx ai-diagram ./src/
```
## What It Does
- Generates Mermaid diagrams from your code
- Supports flowcharts, class diagrams, sequence diagrams
- Creates ER diagrams from database schemas
- Outputs markdown-compatible Mermaid syntax
## Usage Examples
```bash
# Generate flowchart
npx ai-diagram ./src/
# Class diagram
npx ai-diagram ./src/ --type class -o architecture.mmd
# Sequence diagram of function calls
npx ai-diagram ./src/ --type sequence
# Entity relationship diagram
npx ai-diagram ./src/ --type er
```
## Best Practices
- **Pick the right diagram type** - use class for OOP, flow for processes
- **Focus on key modules** - don't diagram everything
- **Keep them updated** - run periodically as code changes
- **Add to docs** - Mermaid renders in GitHub markdown
## When to Use This
- Onboarding new team members
- Documentation that's always out of date
- Understanding unfamiliar codebases
- Architecture reviews and planning
## Part of the LXGIC Dev Toolkit
This is one of 110+ free developer tools built by LXGIC Studios. No paywalls, no sign-ups, no API keys on free tiers. Just tools that work.
**Find more:**
- GitHub: https://github.com/LXGIC-Studios
- Twitter: https://x.com/lxgicstudios
- Substack: https://lxgicstudios.substack.com
- Website: https://lxgicstudios.com
## Requirements
No install needed. Just run with npx. Node.js 18+ recommended. Needs OPENAI_API_KEY environment variable.
```bash
npx ai-diagram --help
```
## How It Works
Reads your source files to understand the structure, relationships, and data flow. Then generates Mermaid syntax that renders as diagrams in markdown editors, GitHub, and documentation tools.
## License
MIT. Free forever. Use it however you want.
