Mermaid MCP: MCP server, setup and security

What Mermaid MCP does

According to its repository: “Mermaid diagram generation (flowcharts, sequence, class, ER, architecture and state diagrams) with templates, layout engines and SVG/PNG/PDF export.”

An MCP server gives an AI agent extra tools it calls during the conversation: the agent reads their description, decides to use them and gets the result back. Mermaid MCP is listed under Design, art and accessibility, a category of 95 servers in the directory, where it ranks #46 by stars.

Topics declared by the repository: architecture, automation, claude, cli-tool, copilot, devtools.

Installing and connecting Mermaid MCP

No package or remote server is declared in the official MCP registry: you install it from source, following the repository README.

Like any MCP server, you declare it in your client's configuration (Claude Desktop, Claude Code, Cursor, VS Code, Codex…): a name, the command that starts it or its URL, and any environment variables. The client then starts it and lists its tools. Project language: TypeScript. Listed systems: macOS, Windows, Linux.

Security: what to check

An MCP server runs code with the rights you give it, and the model reads its tool descriptions: a malicious or compromised server can hijack the agent. Read the code, or pick a maintained and widely used server, before connecting it.

Points found for Mermaid MCP:

• No licence: without a licence the code is not legally reusable, even if it is public. Avoid it in a company setting without the author's agreement.

Good practice: grant only the rights needed (least privilege), require human approval for irreversible actions, and run the AI agent security check.

Project activity and maintenance

Created on October 30, 2025, the Narasimhaponnada/mermaid-mcp repository has 53 stars and 10 forks, with 3 open issues. It has more stars than 53% of the servers in the directory. Last change 12 months ago.

Stars measure attention, not quality: a recent, heavily promoted project can collect them fast, while a useful but niche server will have few.