MCP Servers

hafasmcp

MCP server for real-time German public transport data (HAFAS/VBN network). Enables querying departures, arrivals, journeys, and nearby stops using natural language.

README

[!NOTE] vibe-coded ✨

hafasmcp

MCP server for real-time German public transport data via HAFAS. Lets Claude (or any MCP client) query departures, arrivals, journeys, and nearby stops — currently configured for the VBN network (Lower Saxony / Bremen).

No API key needed. Uses the same public HAFAS API as fahrplaner.vbn.de.

Tools

Tool	Description
`locations`	Search stops, addresses, or POIs by name
`departures`	Upcoming departures from a stop
`arrivals`	Upcoming arrivals at a stop
`journeys`	Route planning between two locations
`nearby`	Find stops near a coordinate

Quick Start

With Claude Code (stdio)

Add to your MCP config:

{
  "mcpServers": {
    "hafas": {
      "command": "node",
      "args": ["dist/index.js"],
      "cwd": "/path/to/hafasmcp"
    }
  }
}

With Docker (HTTP + OAuth 2.1)

cp .env.example .env
docker compose up -d

This starts the HTTP server on port 3000 with a Cloudflare quick tunnel for remote access.

Local Development

npm install
npm run build
npm start              # stdio mode
npm run start:http     # HTTP mode with OAuth 2.1

Environment Variables

Variable	Default	Description
`PORT`	`3000`	HTTP server port
`ISSUER_URL`	`http://localhost:$PORT`	OAuth 2.1 issuer URL

How It Works

The server wraps hafas-client with the VBN profile and exposes it as MCP tools. Two transport modes:

Stdio — for local MCP clients like Claude Code, zero config
HTTP — for remote access, with full OAuth 2.1 (dynamic client registration, PKCE, auto-approve)

Example

Ask Claude:

"Wann fährt die nächste Straßenbahn vom Hauptbahnhof Bremen?"

Claude will use locations to find the stop ID, then departures to get real-time data — all in under a second.

Stack

TypeScript, Node.js, hafas-client, @modelcontextprotocol/sdk, Express 5

License

ISC

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