Mermaid MCP Server

AI-powered Mermaid diagram generation using Model Context Protocol (MCP)

npm version npm downloads Node.js License MCP Mermaid

🎯 Overview

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.

✨ Key Features

🤖 AI-Powered Generation: Create diagrams using natural language with GitHub Copilot or Claude
🎨 Production-Ready SVGs: XML-compliant, validated SVG files ready for any use
📦 50+ Pre-built Templates: Architecture patterns, workflows, and data models
🔧 Multiple Integrations: VS Code, Claude Desktop, Cursor IDE, CLI, and custom apps
🚀 22+ Diagram Types: Flowcharts, sequences, ERDs, state machines, Gantt charts, and more
⚡ Fast & Reliable: Browser-based rendering with Puppeteer for consistent output

📋 What's Included

Mermaid/
├── mermaid-mcp-server/          # Main MCP server
│   ├── src/                     # TypeScript source code
│   ├── dist/                    # Compiled JavaScript
│   ├── examples/architectures/  # 5 production-ready SVG samples
│   ├── package.json             # Dependencies
│   └── README.md                # Server documentation
├── Setup.md                     # Complete setup guide
├── UserGuide.md                 # Comprehensive usage guide
└── *.md                         # Analysis and documentation

🚀 Quick Start

Prerequisites

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

Installation

Option 1: Install from NPM (Recommended)

Global installation - easiest way to get started

npm install -g @narasimhaponnada/mermaid-mcp-server

Test the installation

mermaid-mcp --version

The server is now ready to use with Copilot/Claude!

Option 2: Install from Source

Clone the repository

git clone https://github.com/Narasimhaponnada/mermaid-mcp.git cd mermaid-mcp/mermaid-mcp-server

Install dependencies

npm install

Build the server

npm run build

Generate sample diagrams

node generate-svg-samples.js

Configure with GitHub Copilot

Add to your VS Code settings (Cmd+Shift+P → "Preferences: Open User Settings (JSON)"):

If installed via NPM globally:

{ "github.copilot.mcp.servers": { "mermaid": { "command": "mermaid-mcp" } } }

If installed from source:

{ "github.copilot.mcp.servers": { "mermaid": { "command": "node", "args": ["/absolute/path/to/mermaid-mcp-server/dist/index.js"] } } }

Use with Copilot

Open GitHub Copilot Chat and try:

Create a microservices architecture diagram for an e-commerce platform

Generate a CI/CD pipeline flowchart showing GitHub Actions workflow

Show me a sequence diagram for user authentication with OAuth

📚 Documentation

Setup.md - Complete installation and configuration guide (807 lines)
UserGuide.md - Comprehensive usage guide with examples (2,349 lines)
mermaid-mcp-server/README.md - Server-specific documentation
mermaid-mcp-server/PROJECT-SUMMARY.md - Technical deep-dive

🎨 Diagram Types Supported

Process Diagrams: Flowcharts, Block Diagrams
Interactions: Sequence Diagrams, User Journeys, Timelines
Structure: Class Diagrams, ER Diagrams, C4 Diagrams, Architecture
Data Visualization: Pie Charts, XY Charts, Sankey, Radar, Quadrant, Treemap
Project Management: Gantt Charts, Requirement Diagrams, Kanban Boards
Specialized: State Diagrams, Git Flow, Mindmaps, Packet Diagrams

🔌 Integration Methods

GitHub Copilot in VS Code - Daily development workflow
Claude Desktop - Standalone diagram generation
Cursor IDE - AI-first development
Direct CLI - Automation and scripting
MCP Inspector - Testing and debugging
Custom Applications - Build your own integrations

💡 Use Cases

📖 Documentation: Auto-generate architecture diagrams for docs
🔄 Code Reviews: Include diagrams in pull requests
👥 Onboarding: Visual guides for new developers
📊 Technical Proposals: Explain changes with visuals
🚨 Incident Response: Document incidents with timelines
💼 Client Presentations: Explain technical concepts visually
📚 Training Materials: Create consistent learning resources

🌟 Example Output

The server generates production-ready SVG files like these (included in examples/architectures/):

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

All SVGs are XML-validated and render perfectly in browsers, documentation, and presentations.

🛠️ Technology Stack

Node.js - Server runtime
TypeScript - Type-safe development
Puppeteer - Browser-based rendering
Mermaid v10 - Diagramming library (via CDN)
MCP SDK - Model Context Protocol implementation

📈 Project Status

✅ Production-Ready: All core features implemented and tested
✅ Validated: All SVG outputs are XML-compliant
✅ Documented: Comprehensive guides and examples
✅ Clean Codebase: 43 essential files, no cruft
✅ Battle-Tested: Fixed HTML-to-XML tag issues, subgraph syntax, etc.

🤝 Contributing

Contributions are welcome! Please feel free to:

Report bugs and issues
Suggest new diagram types or features
Submit pull requests
Share usage examples and best practices

📄 License

MIT License - see mermaid-mcp-server/LICENSE for details

🙏 Acknowledgments

Mermaid.js - Amazing diagramming library
Model Context Protocol - Enabling AI tool integration
GitHub Copilot - AI-powered development
Puppeteer - Reliable browser automation

📞 Support

📖 Documentation: See Setup.md and UserGuide.md
🐛 Issues: Open an issue on GitHub
💬 Discussions: Start a discussion for questions
📧 Contact: Via GitHub profile

🚀 Getting Started

Read the setup guide: Setup.md
Install and configure: Follow the quick start above
Try it out: Generate your first diagram with Copilot
Explore use cases: Check UserGuide.md
Integrate into your project: Use one of 6 integration methods

Last Updated: October 30, 2025
Author: Narasimha Rao Ponnada
Version: 1.0.0

Start creating amazing diagrams with AI! 🎨📊✨

Mermaid-MCP