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Gemini CLI

Diagrams MCP Server for Gemini CLI

io.github.mohammad-emad-dev/diagrams-mcp-server

Local-first MCP server for PlantUML and Mermaid diagrams with drift detection.

client:Gemini CLI transport:stdio runtime:npm

Install Diagrams MCP Server in Gemini CLI

~/.gemini/settings.json · windows: %USERPROFILE%\.gemini\settings.json

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

{
  "mcpServers": {
    "diagrams-mcp-server": {
      "command": "npx",
      "args": [
        "-y",
        "diagrams-mcp-server"
      ],
      "env": {
        "PROJECT_ROOT": "<PROJECT_ROOT>",
        "DIAGRAMS_DIR": "<DIAGRAMS_DIR>",
        "PLANTUML_SERVER_URL": "<PLANTUML_SERVER_URL>",
        "ALLOW_REMOTE_PLANTUML": "<ALLOW_REMOTE_PLANTUML>",
        "DISABLE_REMOTE_PLANTUML": "<DISABLE_REMOTE_PLANTUML>"
      }
    }
  }
}

Gemini expands $VAR and ${VAR} inside env values, so a secret can live in your shell rather than this file. Gemini CLI docs

Diagrams MCP Server in other clients

Diagrams MCP Server MCP server