# transit_departures

Get live public-transport departures with real-time delays for a stop. Sourced from GTFS-RT/HVV/VGN. Unlike the static stop list (get_city_resource(slug, resource='transit')), this returns minute-fresh departures including delay for ONE stop. A stop_id is required: fetch the city's transit stops first to discover valid stop IDs, then pass one here. Read-only.

Agent View of the PolicyLayer registry record for `transit_departures`. HTML page: https://policylayer.com/tools/dev-infranode-infranode/transit-departures

## Facts

- Tool: `transit_departures`
- Server: InfraNode (`https://mcp.infranode.dev/mcp`) — https://policylayer.com/tools/dev-infranode-infranode.md
- Homepage: https://github.com/street1983nk/infranode
- Risk category: Read (Low risk)
- Registry record: grade C, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 2 (1 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `slug` | string | yes | City identifier, e.g. 'berlin' or 'hamburg'. Resolved leniently: the German name with or without umlauts, any casing, a common English exonym or short form also |
| `stop_id` | object | no | Required stop ID to fetch departures for. Discover a city's stop IDs with get_city_resource(slug, resource='transit') first (each stop carries its id). Format: |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "transit_departures",
    "arguments": {
      "slug": "<slug>"
    }
  }
}
```

## Why transit_departures is rated Low

Retrieves real-time transit data without modifying or deleting any system state.

From the tool's own definition: "Get live public-transport departures, read-only, no side effects"

## Use case

AI agents call transit_departures to retrieve information from InfraNode without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches InfraNode:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "transit_departures": {}
  }
}
```

## Other tools on InfraNode (11)

- `air_quality` — Read — https://policylayer.com/tools/dev-infranode-infranode/air-quality.md
- `compare` — Read — https://policylayer.com/tools/dev-infranode-infranode/compare.md
- `get_city` — Read — https://policylayer.com/tools/dev-infranode-infranode/get-city.md
- `get_city_overview` — Read — https://policylayer.com/tools/dev-infranode-infranode/get-city-overview.md
- `get_city_resource` — Read — https://policylayer.com/tools/dev-infranode-infranode/get-city-resource.md
- `list_cities` — Read — https://policylayer.com/tools/dev-infranode-infranode/list-cities.md
- `pois` — Read — https://policylayer.com/tools/dev-infranode-infranode/pois.md
- `sources` — Read — https://policylayer.com/tools/dev-infranode-infranode/sources.md
- `station_board_arrivals` — Read — https://policylayer.com/tools/dev-infranode-infranode/station-board-arrivals.md
- `station_board_departures` — Read — https://policylayer.com/tools/dev-infranode-infranode/station-board-departures.md
- `weather` — Read — https://policylayer.com/tools/dev-infranode-infranode/weather.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=dev-infranode-infranode · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/dev-infranode-infranode