uml-mcp

Repository · MIT License · Docs · Hosted MCP

uml-mcp is an open-source Model Context Protocol server that generates Mermaid, PlantUML, and Kroki diagrams from natural-language prompts or explicit diagram source. Use it in Cursor (MCP tools) or ChatGPT via a Custom GPT.

Blog write-up: uml-mcp — diagrams from chat.

Features

• generate_uml and related MCP tools for sequence, class, flow, and deployment sketches
• Multiple render backends (Mermaid, PlantUML, Kroki)
• Used across this portfolio blog for inline .mmd + SVG diagrams

Quick start

git clone https://github.com/antoinebou12/uml-mcp.git
cd uml-mcp

Follow the README for Python dependencies and Cursor MCP configuration.

Related

• D2COpenAIPlugin — earlier ChatGPT plugin path
• PlantUMLAPI — Python PlantUML client predecessor