Mermaid MCP server

This is a small helper that lets your AI draw diagrams for you. You describe what you want in normal words, and it creates a proper picture file you can drop into a document or a slide. It is handy for anyone who needs to explain how something works but does not want to drag boxes around by hand.

What this MCP server does

You type a request like "draw a flowchart for our sign-up process" into your AI chat. Your AI passes that request to this helper. The helper turns your words into Mermaid diagram code, then uses a hidden browser to render that code into a real picture file, usually an SVG. You get the finished diagram back, ready to save, share, or paste into your documentation.

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What you can do with it

• Create flowcharts from a plain description of steps
• Draw sequence diagrams that show who talks to whom and in what order
• Build architecture and cloud infrastructure pictures
• Generate ER diagrams that show how data tables relate
• Make state diagrams that show how something moves between states
• Produce Gantt charts for project timelines
• Export the finished diagram as SVG, PNG, or PDF

Try asking your AI

• “Create a microservices architecture diagram for an e-commerce platform”
• “Generate a CI/CD pipeline flowchart showing a GitHub Actions workflow”
• “Show me a sequence diagram for user authentication with OAuth”
• “Draw an ER diagram for a simple online store with customers, orders, and products”

What it gives back to you

You get a diagram file back, usually an SVG picture that opens in any browser and stays sharp at any size. The chat also shows you the Mermaid text behind the picture, so you can tweak it yourself later. If you asked for PNG or PDF, you get that format instead. The diagram is saved as a file you can download or copy into your document.

Before you start

Who it's for

Anyone who has to explain a process or a system in a picture, like developers, architects, technical writers, and project managers.