# search_roundtrip_flights

Search real-time round-trip flights from Google Flights, priced as paired legs rather than two separate one-ways. IMPORTANT: for any flexible search, make ONE call. Pass departure_date_from / departure_date_to for a departure range, and nights instead of return_date to search trip lengths -- '5 to 7 nights in Rome sometime in May' is one call. FREE TIER LIMIT: one call searches at most 15 departure-date x nights combinations. A wider request is sampled evenly rather than rejected, and returns truncated: true plus the exact dates searched in search_coverage.departure_dates_searched. A date absent from that list was never searched -- which is not the same as having no flights. Returns total price for both legs, per-leg airline, stops and duration, and a single bookable buy_link covering the trip.

Agent View of the PolicyLayer registry record for `search_roundtrip_flights`. HTML page: https://policylayer.com/tools/com-flightpowers-freemium-google-flights-and-booking/search-roundtrip-flights

## Facts

- Tool: `search_roundtrip_flights`
- Server: Free Flight and Hotel Search (no API key) (`https://lulu.flightpowers.com/mcp`) — https://policylayer.com/tools/com-flightpowers-freemium-google-flights-and-booking.md
- Homepage: https://github.com/mtnrabi/travel-agent-skills
- Risk category: Read (Low risk)
- Registry record: grade C, identity unverified
- Server auth posture: open
- Server rate-limited: no
- Parameters: 12 (2 required)
- Recommended policy verdict: Allowed

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `limit` | integer | no |  |
| `nights` | object | no |  |
| `sort_by` | string | no |  |
| `currency` | string | no |  |
| `max_price` | object | no |  |
| `seat_type` | object | no |  |
| `passengers` | object | no |  |
| `to_airport` | object | yes |  |
| `return_date` | object | no |  |
| `from_airport` | string | yes |  |
| `use_fallback` | boolean | no |  |
| `departure_date` | object | no |  |

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": "search_roundtrip_flights",
    "arguments": {
      "to_airport": {},
      "from_airport": "<from_airport>"
    }
  }
}
```

## Why search_roundtrip_flights is rated Low

Tool retrieves flight data without creating, modifying, or deleting any records.

From the tool's own definition: "Search real-time round-trip flights from Google Flights, priced as paired legs."

Risk signals: High parameter count (18 properties)

## Use case

AI agents call search_roundtrip_flights to retrieve information from Free Flight and Hotel Search (no API key) 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 Free Flight and Hotel Search (no API key):

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

## Other tools on Free Flight and Hotel Search (no API key) (3)

- `find_hotel_by_name` — Read — https://policylayer.com/tools/com-flightpowers-freemium-google-flights-and-booking/find-hotel-by-name.md
- `search_hotels` — Read — https://policylayer.com/tools/com-flightpowers-freemium-google-flights-and-booking/search-hotels.md
- `search_oneway_flights` — Read — https://policylayer.com/tools/com-flightpowers-freemium-google-flights-and-booking/search-oneway-flights.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=com-flightpowers-freemium-google-flights-and-booking · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/com-flightpowers-freemium-google-flights-and-booking