UML Forge MCP Server: Install & Setup

Install UML Forge in Claude Code

Claude Code

claude mcp add uml-forge -e UMLFORGE_API_KEY=... -- uvx umlforge

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "uml-forge": {
      "command": "uvx",
      "args": [
        "umlforge"
      ],
      "env": {
        "UMLFORGE_API_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the UML Forge MCP server do?

Architecture intelligence, security analysis, and living docs. 15 tools, Mermaid output.

Is the UML Forge MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does UML Forge run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add UML Forge to Claude Code?

Run: claude mcp add uml-forge -e UMLFORGE_API_KEY=... -- uvx umlforge

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