rdw-mcp

RDW MCP Server

A Model Context Protocol server that exposes the Dutch RDW open vehicle registration data to LLM-powered clients such as Claude Desktop, VS Code Copilot Chat, and any other MCP-compatible host.

Built on the official modelcontextprotocol/go-sdk.

Features

• Look up a Dutch license plate (kenteken) and receive a complete vehicle report covering registration, fuel & emissions, axles, and bodywork.
• Returns both human-readable text and structured JSON output for typed consumption by LLMs.
• Two transports out of the box: stdio (for desktop clients) and Streamable HTTP (for hosted deployments).
• No authentication required — RDW data is fully public open data.

Quickstart

Install

go install github.com/rantuma/rdw-mcp@latest

Or download a binary from the releases page.

Run

# stdio transport (default — for Claude Desktop, Cursor, etc.)
rdw-mcp

# HTTP transport (Streamable HTTP)
rdw-mcp --http
rdw-mcp --http --port=8080

Client configuration

Claude Desktop

Add the following to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "rdw": {
      "command": "rdw-mcp"
    }
  }
}

VS Code

Add to .vscode/mcp.json:

{
  "servers": {
    "rdw": {
      "type": "stdio",
      "command": "rdw-mcp"
    }
  }
}

Tools

Input

{ "kenteken": "AB-12-CD" }

Hyphens, spaces, and case are normalised automatically.

Output

The tool returns both unstructured text (a multi-section human-readable report) and a structured payload:

{
  "kenteken": "AB12CD",
  "found": true,
  "base":  { /* RDW base registration */ },
  "fuel":  [ /* fuel & emissions records */ ],
  "axles": [ /* axle records */ ],
  "body":  [ /* body / carrosserie records */ ],
  "report": "COMPLETE RDW Database Information for AB12CD: …"
}

HTTP endpoints

When running with --http, the server exposes:

• POST /mcp — Streamable HTTP MCP endpoint
• GET /health — Health check (JSON status, server name, version)

CORS is permissive (*) by default to ease local development.

Development

make build          # build local binary
make test           # run tests
make test-coverage  # run tests with coverage gate (>=80%)
make lint           # run golangci-lint
make build-all      # cross-compile for linux/darwin/windows × amd64/arm64

See CONTRIBUTING.md for details.

Data source

All vehicle data comes from RDW (Rijksdienst voor het Wegverkeer) open data. RDW updates the dataset daily and the data is provided as-is; this server simply formats and forwards it.

License

MIT