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PlantUML MCP Server

@mzagar

Repository

Basic information

Category

Other

Last updated

Transports

stdio

Author

mzagar

Submitted by

Mario Zagar

About PlantUML MCP Server

A Model Context Protocol (MCP) server that provides PlantUML diagram generation capabilities for Claude Desktop and Claude Code.

#plantuml#puml#uml#diagram#diagrams

PlantUML MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "plantuml": {
      "command": "npx",
      "args": [
        "plantuml-mcp-server"
      ],
      "env": {
        "PLANTUML_SERVER_URL": "https://www.plantuml.com/plantuml"
      }
    }
  }
}

PlantUML MCP Server tools

3

Generate a PlantUML diagram with automatic syntax validation and error reporting for auto-fix workflows. Returns embeddable image URLs for valid diagrams or structured error details for invalid syntax that can be automatically corrected. Optionally saves the diagram to a local file.

Encode PlantUML code for URL usage

Decode encoded PlantUML string back to PlantUML code

Overview

What is PlantUML-MCP-Server?

A Model Context Protocol (MCP) server that integrates PlantUML diagram generation into Claude Desktop and Claude Code. It provides tools to generate, encode, and decode PlantUML diagrams, producing embeddable SVG/PNG URLs.

How to use PlantUML-MCP-Server?

Add the server to Claude Desktop or Claude Code using npx plantuml-mcp-server and optionally set the PLANTUML_SERVER_URL environment variable (defaults to public PlantUML server). After activation, ask Claude to generate any PlantUML diagram type (sequence, class, C4, etc.) using the generate_plantuml_diagram tool.

Key features of PlantUML-MCP-Server

  • Three tools: generate, encode, and decode PlantUML diagrams.
  • Produces embeddable SVG/PNG URLs for diagrams.
  • Supports advanced PlantUML features like !include and external libraries.
  • Configurable PlantUML server URL via environment variable.
  • Works with both Claude Desktop and Claude Code.

Use cases of PlantUML-MCP-Server

  • Quickly create sequence diagrams to document workflows within Claude.
  • Generate C4 architecture diagrams for software projects.
  • Encode or decode PlantUML code for sharing via URLs.
  • Embed diagrams in Claude responses without leaving the chat.

Frequently asked questions

1

What tools does PlantUML-MCP-Server provide?

It provides three tools: `generate_plantuml_diagram` to create diagrams with SVG/PNG URLs, `encode_plantuml` to convert PlantUML code into an encoded string, and `decode_plantuml` to reverse the encoding.

2

How do I configure a custom PlantUML server?

Set the `PLANTUML_SERVER_URL` environment variable to your server’s URL when adding the MCP server to Claude Desktop or Claude Code (default is `https://www.plantuml.com/plantuml`).

3

What are the runtime requirements?

Node.js 18+ and npm are required for local installation. The server runs via `npx` without local installation for normal use.

4

Does this server store any data or require authentication?

No. The server only interacts with the configured PlantUML server to generate/encode/decode diagrams; no authentication or persistent storage is mentioned.

5

What transport protocol does the server use?

It uses the standard Model Context Protocol (MCP) for communication with Claude clients; no custom transports are specified.

Comments

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