Diagrammo (dgmo)

What is Diagrammo (dgmo)?

Diagrammo (dgmo) is an MCP server that renders 35+ diagram types — sequence, flowchart, ER, C4, gantt, kanban, mindmap, infrastructure, sitemap, journey map, tech radar, and more — to SVG or PNG from concise text markup. It outputs renders locally with no API key required and can produce shareable online.diagrammo.app URLs or open diagrams in the local Diagrammo desktop app.

How to use Diagrammo (dgmo)?

Install by adding the dgmo entry to your Claude Desktop or Claude Code configuration using npx -y @diagrammo/dgmo-mcp. After restarting the client, the tools appear automatically. Use tools like render_diagram, share_diagram, open_in_app, list_chart_types, get_language_reference, preview_diagram, and generate_report.

Key features of Diagrammo (dgmo)

• Render 35+ diagram types from text markup
• Output to SVG or PNG
• Fully local rendering — no API key needed
• Generate persistent shareable online.diagrammo.app URLs
• Open diagrams in the local Diagrammo desktop app
• 10 built-in color palettes with light/dark themes

Use cases of Diagrammo (dgmo)

• Create a sequence diagram for an OAuth 2.0 authorization code flow and get a share link
• Render a C4 container diagram for a typical SaaS app architecture
• Build a 6-month gantt chart for shipping a mobile app
• Generate infrastructure diagrams, mindmaps, or tech radars from text
• Produce multi-section HTML reports with table of contents

FAQ from Diagrammo (dgmo)

How does Diagrammo (dgmo) compare to Mermaid?

dgmo offers beautiful defaults with 10 built-in palettes, supports more diagram types (ER schemas, C4, kanban, infrastructure, tech radar, etc.), generates persistent share links, and requires no API key — all rendering is local.

What dependencies or runtime are required?

The server runs via npx, so Node.js and npm must be installed on your machine. No additional dependencies or accounts are needed.

Where does my diagram data live?

All rendering happens locally on your machine. Your diagram text and data never leave your computer. Share links encode the diagram markup in the URL but are hosted on diagrammo.app.

What transports and authentication does the server use?

The MCP server communicates over standard stdio transport. No API key, authentication, or external services are required for rendering.

Are there any known limits or unsupported features?

The README does not describe any specific limits. All 35+ chart types are fully supported locally. The server provides a get_language_reference tool to fetch full syntax documentation.