Generate professional diagrams from natural language using the best-fit Python library for each diagram type
npx claudepluginhub edmondop/diagram-claude-pluginGenerate professional diagrams from natural language using the best-fit Python library for each diagram type.
edmondopA Claude Code plugin that generates professional diagrams from natural language. It routes each request to the best-fit Python library, produces a uv run-compatible script, and saves both the script and SVG output for version control.
Add the plugin to your Claude Code settings (.claude/settings.json):
{
"extraKnownMarketplaces": [
"https://github.com/edmondop/diagram-claude-plugin"
]
}
uv run with inline dependency metadataInstall Graphviz:
# macOS
brew install graphviz
# Ubuntu / Debian
sudo apt-get install graphviz
# Fedora
sudo dnf install graphviz
| Diagram type | Primary library | Alternative | When to pick alternative |
|---|---|---|---|
| Flowchart / pipeline | graphviz | schemdraw | No Graphviz installed; simple linear flow |
| Generic architecture | graphviz | -- | -- |
| Cloud/infra architecture | diagrams (mingrammer) | graphviz | Don't need cloud provider icons |
| ERD | graphviz | -- | -- |
| Pyramid / stacked layers | svgwrite | drawsvg | Prefer cleaner API, less precise control needed |
| Sequence diagram | seqdiag | svgwrite | seqdiag for speed; svgwrite for full control |
| Network / DAG | networkx + matplotlib | graphviz | graphviz for DOT-style output |
| Block diagram | blockdiag | schemdraw | schemdraw for flow-style blocks |
| State machine / FSM | graphviz | -- | -- |
Use the /diagram slash command or just ask Claude to draw something:
/diagram authentication flow for a web app
Draw me an ERD for an e-commerce system with users, orders, and products
Create a cloud architecture diagram showing an AWS setup with ECS, RDS, and ElastiCache
The plugin will classify the diagram type, suggest a library, generate a script, run it, and open the SVG for review. You can iterate on the output until it looks right.
Install just, then run all checks:
just all
This runs ruff (lint + format), pyrefly (type check), markdownlint, and smoke tests for all scripts.
MIT — Copyright (c) 2026 Edmondo Porcu