Mermaid MCP Server

Generat 22 types mermaid architecture diagrams with natural language description

Local serverstdioTypeScript

What is the Mermaid MCP server?

Mermaid MCP server is a locally run integration for AI assistants that speak the Model Context Protocol. Generat 22 types mermaid architecture diagrams with natural language description.

What you get

The Mermaid MCP Server enables AI assistants like GitHub Copilot, Claude, and custom LLM applications to generate professional architecture diagrams, flowcharts, sequence diagrams, and more using natural language. It provides a Model Context Protocol interface for seamless integration with AI coding assistants.

What the assistant can call

Once Mermaid is connected, these are the calls the assistant has available:

  • Interactions — Sequence Diagrams, User Journeys, Timelines
  • Structure — Class Diagrams, ER Diagrams, C4 Diagrams, Architecture
  • Specialized — State Diagrams, Git Flow, Mindmaps, Packet Diagrams
  • microservices — architecture.svg (27KB) - Microservices with API Gateway
  • cloud — infrastructure.svg (31KB) - Cloud infrastructure components
  • cicd — pipeline.svg (28KB) - Complete CI/CD workflow
  • data — pipeline.svg (24KB) - ETL data processing pipeline
  • serverless — architecture.svg (31KB) - Event-driven serverless
  • Node.js — Server runtime
  • TypeScript — Type-safe development
  • Puppeteer — Browser-based rendering
  • Mermaid.js — Amazing diagramming library

Configuration and credentials

  • Node.js 18 or higher - npm or yarn - GitHub Copilot (recommended) or Claude Desktop

Setting it up

@narasimhaponnada/mermaid-mcp-server on npm is all you need. Most clients run it directly, so configuration is a few lines and a restart.

Choosing this one

Among the cloud and infrastructure options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Mermaid's toolset — Interactions, Structure, Specialized and 11 more — is a fair guide to whether it matches your workflow.

SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.

Before you rely on it

  • It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
  • With 14 tools registered it takes up a noticeable share of the context window; turn it off in projects that never touch Mermaid.
  • MCP clients confirm each tool call by default. Leave that on until you have watched what the mermaid mcp server does with a few real requests.

Available tools

ToolWhat it does
InteractionsSequence Diagrams, User Journeys, Timelines
StructureClass Diagrams, ER Diagrams, C4 Diagrams, Architecture
SpecializedState Diagrams, Git Flow, Mindmaps, Packet Diagrams
microservicesarchitecture.svg (27KB) - Microservices with API Gateway
cloudinfrastructure.svg (31KB) - Cloud infrastructure components
cicdpipeline.svg (28KB) - Complete CI/CD workflow
datapipeline.svg (24KB) - ETL data processing pipeline
serverlessarchitecture.svg (31KB) - Event-driven serverless
Node.jsServer runtime
TypeScriptType-safe development
PuppeteerBrowser-based rendering
Mermaid.jsAmazing diagramming library
PrerequisitesThe Prerequisites tool exposed by this server.
InstallationThe Installation tool exposed by this server.

How to install the Mermaid MCP server

{
  "mcpServers": {
    "mermaid-mcp-git": {
      "command": "npx",
      "args": ["-y", "@narasimhaponnada/mermaid-mcp-server"]
    }
  }
}

Add to claude_desktop_config.json, then restart Claude Desktop.

Configuration

  • Node.js 18 or higher - npm or yarn - GitHub Copilot (recommended) or Claude Desktop

Example prompts to try

  • Use Mermaid to Interactions.
  • Use Mermaid to Structure.
  • Use Mermaid to Specialized.

Frequently asked questions

It connects Mermaid to MCP-compatible AI assistants such as Claude and Cursor, exposing 14 tools (Interactions, Structure, Specialized, and more) that the assistant can call on your behalf. Instead of copying data back and forth by hand, the assistant works with Mermaid directly.