# tfl.transit.journey_plan

Plan a multi-modal journey between any two London locations using the TfL journey planner. Accepts free-text addresses, NAPTAN stop IDs, ICS station codes, or lat/lon coordinates as origin and destination. Returns up to 3 journey options with legs, modes (tube, bus, walking, overground, etc.), departure/arrival times, and turn-by-turn summaries. Optionally specify preferred modes (e.g. tube,bus), date (YYYYMMDD), and time (HHMM) for departing or arriving at a specific time. Covers all TfL services: Tube, Overground, Elizabeth line, DLR, bus, tram, river bus, and walking. 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.journey_plan`. HTML page: https://policylayer.com/tools/io-github-whiteknightonhorse-apibase/tfl.transit.journey-plan

## Facts

- Tool: `tfl.transit.journey_plan`
- 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: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 7 (2 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `to` | string | yes | Journey destination — accepts NAPTAN IDs, ICS codes, lat/lon pairs, or free-text location names (e.g. Heathrow Terminal 5, Canary Wharf, Waterloo). |
| `date` | string | no | Journey date in YYYYMMDD format (e.g. 20250710). Defaults to today. Used together with time to find departures or arrivals at that datetime. |
| `from` | string | yes | Journey origin — accepts NAPTAN IDs (940GZZLUKSX), ICS codes (1000008), lat/lon pairs (51.509,-0.128), or free-text location names (e.g. Kings Cross, Victoria, |
| `mode` | string | no | Comma-separated preferred transport modes for the journey (e.g. tube,bus,walking or tube,overground,elizabeth-line). Defaults to all available TfL modes includi |
| `time` | string | no | Journey time in HHMM 24-hour format (e.g. 0830, 1730). Defaults to current time. Interpreted as departure time unless time_is is set to Arriving. |
| `limit` | integer | no | Maximum number of journey options to return (1–5). Defaults to 3. |
| `time_is` | string | no | Whether the time parameter represents a departure or arrival time (Departing or Arriving). Defaults to Departing. |

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.journey_plan",
    "arguments": {
      "to": "<to>",
      "from": "<from>"
    }
  }
}
```

## Why tfl.transit.journey_plan is rated Medium

An AI agent can call tfl.transit.journey_plan faster than any human can review: one bad instruction and it creates or modifies resources in Apibase by the hundred, each call as confident as the last.

## Use case

AI agents use tfl.transit.journey_plan to create or update resources in Apibase, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Apibase environment.

## Recommended policy (PolicyLayer)

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

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "tfl.transit.journey_plan": {
      "limits": [
        {
          "counter": "tfl.transit.journey_plan_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

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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