# app.aplusz/flight-fares

> Cheapest observed fare, 6-month low and best departure date for a city pair.

- name: app.aplusz/flight-fares
- version: 1.0.0
- connection class: R0 (autonomous)
- trust: 92/100
- quality: 79/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/app.aplusz%2Fflight-fares
- tools: https://api.protogrid.dev/v1/servers/app.aplusz%2Fflight-fares/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "flight-fares": {
      "type": "http",
      "url": "https://aplusz.app/mcp"
    }
  }
}
```


## Trust

- hygiene: 100
- liveness: 97
- freshness: 85
- provenance: 85
- drivers: +repository +dns-namespace +website +reachable +uptime-94% ~updated-38d-ago
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 79/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 71 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: find_cheapest_fare (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_routes_from (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); resolve_city (readOnlyHint, destructiveHint, idempotentHint, openWorldHint)
- pass `tools.token_cost`: about 489 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 3, about 489 tokens to load them all
- tool set hash: e730905c561aa59ae4c9264ae61d8c2b
- badge: [![protogrid quality](https://protogrid.dev/badge/app.aplusz/flight-fares.svg)](https://protogrid.dev/servers/app.aplusz/flight-fares)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://aplusz.app/mcp (streamable-http, auth none, reachable true, uptime30d 0.9369369)

## Packages

_none_

## Tools (3)

- `find_cheapest_fare`: Returns the cheapest observed one-way fare between two cities, plus the six-month low and the departure date on which the low was observed. Use whenever the user names an origin and a destination and asks about price, the cheapest date to fly, or whether a fare is a good deal. Both arguments are required; neither alone produces a valid answer. Answers are directional and per pair - PAR to BKK is not BKK to PAR and is not PAR to SIN. Prices are cached snapshots, never live quotes: say "last observed", never "current price", and surface live_check_url to any user about to book.
- `list_routes_from`: Returns destinations reachable from one origin, sorted cheapest first. Use when the user asks where they can fly cheaply from a city, or wants inspiration rather than one specific pair. One call replaces dozens of page fetches. Prices are cached snapshots.
- `resolve_city`: Turns a spoken city name into the uppercase IATA city code the other tools expect. Call this before find_cheapest_fare whenever you are not certain of a code. Do not invent codes.