MCP Servers

transport-gzm

Provides tools for AI agents to query live public transport data for GZM (Silesian Metropolis) including vehicle positions, trip updates, service alerts, and next arrivals.

README

transport_gzm

MCP server wrapping the GTFS-RT live transit feed for GZM (Górnośląsko-Zagłębiowska Metropolia) — the Silesian Metropolis public transport operator in Poland.

Provides a small, focused set of tools so AI agents can answer questions like:

"What buses/trams are currently running on route X?"
"Is vehicle Y delayed? Where is it right now?"
"What alerts are currently active (delays, disruptions, works)?"
"When does the next departure of line 6 arrive at stop Z?"

How it works

GZM publishes a public GTFS-RT feed at https://gtfsrt.transportgzm.pl:5443/gtfsrt/gzm (no auth, CC-BY licensed). It exposes three logical sub-feeds:

Path	Content
`/gtfsrt/gzm/all`	full bundle (all three sub-feeds)
`/gtfsrt/gzm/vehiclePositions`	live GPS positions of every vehicle
`/gtfsrt/gzm/tripUpdates`	arrival-time deltas and stop-skips
`/gtfsrt/gzm/alerts`	service alerts (works, delays, etc.)

This server fetches the protobuf, decodes it, and exposes it as 8 tools that return JSON-friendly structures sized for LLM context windows.

Quick start

Run with Docker (recommended)

docker run -i --rm ghcr.io/wiktor102/transport-gzm:latest

Wire it into your MCP client (Claude Desktop, opencode, …):

{
  "mcpServers": {
    "transport-gzm": {
      "command": "docker",
      "args": ["run", "-i", "--rm", "ghcr.io/wiktor102/transport-gzm:latest"]
    }
  }
}

Run from source

pip install -e .
transport-gzm

…or with uv:

uv run --with mcp[cli] --with gtfs-realtime-bindings --with httpx \
  python -m transport_gzm.server

Tools

Tool	Purpose
`health`	Check feed availability + report feed age
`feed_summary`	Counts of vehicles, trips, alerts currently in the feed
`vehicles`	Search/filter live vehicle positions (by route, stop)
`vehicle_by_id`	Get a single vehicle's current position
`trip_updates`	Arrival predictions; filter by route, stop, or trip
`next_arrivals`	Upcoming arrivals at a stop — like a digitalt board
`alerts`	Active service alerts (works, delays, detours)
`alert_by_id`	One alert by id

See docs/tools.md for full parameter documentation and output schemas.

Configuration

Env var	Default	Purpose
`GZM_FEED_BASE_URL`	`https://gtfsrt.transportgzm.pl:5443/gtfsrt/gzm`	Override the base URL
`GZM_HTTP_TIMEOUT`	`10`	HTTP timeout in seconds
`GZM_CACHE_TTL`	`10`	In-process feed cache TTL in seconds
`GZM_MAX_VEHICLES`	`200`	Default cap for `vehicles()`
`GZM_MAX_TRIPS`	`200`	Default cap for `trip_updates()`
`GZM_MAX_ALERTS`	`100`	Default cap for `alerts()`
`GZM_USER_AGENT`	`transport-gzm-mcp/0.1 (+https://github.com/Wiktor102/transport-gzm)`	Outgoing UA
`LOG_LEVEL`	`INFO`	`DEBUG` / `INFO` / `WARNING` / `ERROR`

License

MIT. GTFS-RT data © Górnośląsko-Zagłębiowska Metropolia, CC-BY 4.0.

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