app.aplusz/flight-fares
Description
Cheapest observed fare, 6-month low and best departure date for a city pair.
What our measurements say
app.aplusz/flight-fares is a remote MCP server published at aplusz.app. It has been probed 6 times since 9/14/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 1,041 ms, a delay an agent will notice. It offers a narrow, focused set of 3 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool names clearly indicate their purpose (e.g., find_cheapest_fare, resolve_city).
- Descriptions explain use cases (e.g., 'when the user asks about price') and benefits (e.g., 'replaces dozens of page fetches').
Weaknesses
- find_cheapest_fare's description is cut off ('Both arguments are req') and lacks clarity on date-related outputs.
- list_routes_from's optional 'limit' parameter lacks a default value explanation.
find_cheapest_fare— Description is incomplete and ends abruptly, missing critical parameter details.list_routes_from— Optional 'limit' parameter lacks clarification on default behavior.
Verdict
Event narrative
Risk: low
- 2026-09-14T04:24:59.037Z — No parameter changes detected · Stable legacy operation continued
- 2026-09-14T14:41:53.703Z — No parameter changes detected · Stable legacy operation continued
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 58ms → warm 55ms (penalty 3ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
find_cheapest_fareReturns 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.
fromstringrequiredtostringrequired
list_routes_fromReturns 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.
fromstringrequiredlimitinteger
resolve_cityTurns 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.
querystringrequired
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Legacy
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