# tfl.transit.line_status

Get real-time service status for all Transport for London (TfL) lines including Tube, Overground, Elizabeth line, DLR, bus, tram, and cable car. Returns the current operational status (Good Service, Minor Delays, Severe Delays, Part Suspended, etc.) and the reason for any disruption. Filter by specific modes (tube, overground, elizabeth-line, dlr, bus, tram, cable-car, river-bus) and choose to show only disrupted lines. Returns total line count, how many are disrupted, and per-line status with severity score (0=closed, 10=good). Useful for journey planning, commuter alerts, and real-time London transport monitoring. Source: TfL Unified API — api.tfl.gov.uk. No auth required, TfL Open Data CC-BY.

Agent View of the PolicyLayer registry record for `tfl.transit.line_status`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/tfl.transit.line-status

## Facts

- Tool: `tfl.transit.line_status`
- Server: Apibase (`apibase-mcp-client`) — https://policylayer.com/tools/io-github-whiteknightonhorse-apibase.md
- Install: `npx -y apibase-mcp-client`
- Homepage: https://github.com/whiteknightonhorse/APIbase
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 3
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `modes` | string | no | Comma-separated transport modes to query (e.g. tube,overground,elizabeth-line,dlr,bus,tram,cable-car). Defaults to tube,overground,elizabeth-line,dlr. Valid mod |
| `detail` | boolean | no | Include additional disruption detail such as affected stops (default false). When true, the response includes affected station lists for each disruption. |
| `include_good_service` | boolean | no | Whether to include lines running with Good Service in the results (default true). Set to false to return only lines with disruptions, delays, or suspensions. |

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": "tfl.transit.line_status",
    "arguments": {}
  }
}
```

## Why tfl.transit.line_status is rated Low

Retrieves public transit status data with no side effects or modifications.

From the tool's own definition: "Get real-time service status, returns current operational status"

## Use case

AI agents call tfl.transit.line_status to retrieve information from Apibase 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 Apibase:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "tfl.transit.line_status": {}
  }
}
```

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## 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=io-github-whiteknightonhorse-apibase · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-whiteknightonhorse-apibase