koleobun-mcp

Bun-based MCP server for the Koleo Polish train timetable API.

It exposes the same 14 tools as the Python MCP, including stations, boards, connections, train routes, seat data, and realtime timetable.

Inspired by the original Python implementation: MBratkowski/koleo-mcp.

Requirements

• Supported Bun: 1.3.x (tested on 1.3.11)

Quick start

Run directly from npm with bunx:

bunx koleobun-mcp

If the command starts without crashing, the MCP server is ready.

Local development

bun install
bun run start

Quality checks

bun run format
bun run lint
bun run typecheck

Test with MCP Inspector

bunx @modelcontextprotocol/inspector bunx koleobun-mcp

Then call these tools:

1. tool_search_stations with query = "Krakow"
2. tool_get_departures with station = "Krakow Glowny"
3. tool_search_connections with start = "Krakow", end = "Warszawa", length = 3
4. tool_get_brands
5. tool_get_realtime_timetable with any train_id

Claude Desktop config

Add this to claude_desktop_config.json:

{
  "mcpServers": {
    "koleo": {
      "command": "bunx",
      "args": ["koleobun-mcp"]
    }
  }
}

Authentication (optional, needed for realtime)

Create ~/.config/koleo-mcp/config.json:

{
  "email": "your@email.com",
  "password": "yourpassword"
}

You can override the config path with KOLEO_MCP_CONFIG.

Available tools

| Tool | Description | | ----------------------------- | ----------------------------------------------- | | tool_search_stations | Search stations by name | | tool_get_station_info | Station address, opening hours, facilities | | tool_get_departures | Departures from a station | | tool_get_arrivals | Arrivals at a station | | tool_get_all_trains | All trains (departures + arrivals) at a station | | tool_search_connections | Find connections A->B | | tool_get_train_route | Train route by brand + number | | tool_get_train_by_id | Train route by Koleo train ID | | tool_get_train_calendar | Operating dates for a train | | tool_get_realtime_timetable | Live timetable (auth required) | | tool_get_seat_stats | Seat occupancy stats on a route | | tool_get_seat_availability | Raw seat map by connection ID | | tool_get_brands | List train brands | | tool_get_carriers | List carriers |