davidburet/mcp-kroki-bridge

MCP Kroki Bridge

MCP Kroki Bridge is an ultra-lightweight (4MB) MCP gateway designed to render diagrams and data visualizations by calling [***] This project acts as a relay between your tools (such as LM Studio) and a Kroki instance (local or public).

Description

Key Features

• Multiple Engines: Supports PlantUML and Vega-Lite (Mermaid coming soon).
• Smart Compression: Uses Zlib + Base64 encoding to fit complex diagrams into URLs.
• Network: Exposed both via SSE & /mcp POST, compatible with network calls from LLM.
• Security: Built from scratch with a non-root user, no OS vulnerabilities.

Included Tools

• render_plantuml: Generate professional UML diagrams (classes, sequences, states) and C4 models using PlantUML.
• render_vega: Advanced data visualization. Transform JSON data into beautiful charts (bars, lines, etc.) using https://vega.github.io/.

Usage Example

bash
docker run --rm -p 3001:3001 \
  -e MCP_KROKI_PORT="3001" \
  davidburet/mcp-kroki-bridge:latest

Configuration for LM Studio

Add this to your mcp.json file:

json
{
  "mcpServers": {
    "mpc-kroki": {
      "url": "http://192.168.1.49:3001/sse"
    }
  }
}

Environment Variables

Notes

• Kroki is not included in this image. You must use your own local instance or the public service [***]
• For intensive use, it is recommended to deploy your own Kroki instance.