Is Claude Mermaid safe to use?

Claude Mermaid has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.

How do I install Claude Mermaid?

Claude Mermaid supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What AI clients work with Claude Mermaid?

Claude Mermaid is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is Claude Mermaid actively maintained?

Claude Mermaid is actively maintained — last commit was 3 days ago. It has 149 GitHub stars.

Claude Mermaid

Name: Claude Mermaid
Author: veelenga

claude-mermaid · by veelenga

MCP Server to previewing mermaid diagrams with live reload

149 648/wk 0 tools GitHub npm

No known CVEs

MIT license

Actively maintained

Last commit 3d ago

Works with most clients

Transport: stdio, sse, http

0 tools

Grade F

Edit this pageView history

Developer Tools Design

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mermaid": {
      "command": "claude-mermaid"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

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[![MCPpedia Score](https://mcppedia.org/api/badge/claude-mermaid)](https://mcppedia.org/s/claude-mermaid)

Read me

What Claude Mermaid does

MCP Server to previewing mermaid diagrams with live reload

Test This Server

This server supports HTTP transport. Be the first to test it — help the community know if it works.

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

63/100across 5 weighted dimensions

How we score →

0255075100

−37

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked claude-mermaid against OSV.dev.

Help improve this page

This server is missing a description. Tools and install config are also missing.If you've used it, help the community.

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Reviews

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Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Claude Mermaid safe to use?: Claude Mermaid has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Claude Mermaid?: Claude Mermaid supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What AI clients work with Claude Mermaid?: Claude Mermaid is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is Claude Mermaid actively maintained?: Claude Mermaid is actively maintained — last commit was 3 days ago. It has 149 GitHub stars.

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Discussion

Start a conversation

Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Developer Tools Design

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mermaid": {
      "command": "claude-mermaid"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/claude-mermaid)](https://mcppedia.org/s/claude-mermaid)

Read me

What Claude Mermaid does

MCP Server to previewing mermaid diagrams with live reload

Test This Server

This server supports HTTP transport. Be the first to test it — help the community know if it works.

README

Claude Mermaid MCP Server

MCP server for rendering Mermaid diagrams in Claude Code with live reload functionality and a built-in skill for expert guidance.

Automatically renders diagrams in your browser with real-time updates as you refine them. Perfect for iterative diagram development and documentation workflows.

✨ Features

🔄 Live Reload - Diagrams auto-refresh in your browser as you edit
🎨 Multiple Save Formats - Export to SVG, PNG, or PDF
🌈 Themes - Choose from default, forest, dark, or neutral themes
📐 Customizable - Control dimensions, scale, and background colors
🪄 Interactive Preview - Pan diagrams by dragging, zoom with browser controls, reset position with one click
⬇️ Browser Export - Download diagrams as SVG or PNG directly from the preview
🗂️ Multiple Previews - Use preview_id to work on multiple diagrams simultaneously
💾 Persistent Working Files - Live previews are stored under ~/.config/claude-mermaid/live
🤖 Built-in Skill - Includes a Claude skill with best practices and expert guidance for creating diagrams

Architecture

Project Architecture Diagram

User Workflow Diagram

Dependencies Diagram

🚀 Quick Start

1. Install

Plugin Install (Recommended)

In Claude Code, add the marketplace and install the plugin:

/plugin marketplace add veelenga/claude-mermaid
/plugin install claude-mermaid@claude-mermaid

Then restart Claude Code to activate the plugin.

From npm:

npm install -g claude-mermaid

From source:

git clone https://github.com/veelenga/claude-mermaid.git
cd claude-mermaid
npm install && npm run build && npm install -g .

2. Verify Installation

Plugin install: The MCP server is configured automatically. Just verify:

/mcp

You should see mermaid in the MCP server list.

npm install: Configure the MCP server manually:

claude mcp add --scope user mermaid claude-mermaid

Then verify:

claude mcp list

You should see mermaid: claude-mermaid - ✓ Connected

🔌 Other MCP Client Configurations

While this server is optimized for Claude Code, it can work with any MCP-compatible client. Here's how to configure it for other popular tools:

Codex

Add to your Codex MCP settings file (~/.codex/mcp_settings.json):

{
  "mcpServers": {
    "mermaid": {
      "command": "claude-mermaid"
    }
  }
}

Or configure via Codex CLI:

codex mcp add mermaid claude-mermaid

Cursor

Add to your Cursor MCP config file (.cursor/mcp.json or settings):

{
  "mcpServers": {
    "mermaid": {
      "command": "claude-mermaid"
    }
  }
}

Or use Cursor's settings UI:

Open Cursor Settings (Cmd/Ctrl + ,)
Navigate to MCP Servers
Add a new server with command: claude-mermaid

VSCode with Cline Extension

If using the Cline extension for VSCode:

Open VSCode settings (Cmd/Ctrl + ,)
Search for "Cline MCP"
Add to MCP Settings JSON:

{
  "mcpServers": {
    "mermaid": {
      "command": "claude-mermaid"
    }
  }
}

Windsurf

Add to Windsurf's MCP configuration file:

{
  "mcpServers"

... [View full README on GitHub](https://github.com/veelenga/claude-mermaid#readme)

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

63/100across 5 weighted dimensions

How we score →

0255075100

−37

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked claude-mermaid against OSV.dev.

Help improve this page

This server is missing a description. Tools and install config are also missing.If you've used it, help the community.

Add information

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Claude Mermaid safe to use?: Claude Mermaid has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Claude Mermaid?: Claude Mermaid supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What AI clients work with Claude Mermaid?: Claude Mermaid is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is Claude Mermaid actively maintained?: Claude Mermaid is actively maintained — last commit was 3 days ago. It has 149 GitHub stars.

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View all →

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MCP Security Weekly

Get CVE alerts and security updates for Claude Mermaid and similar servers.

Community