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Directory / Airfare Brain

Airfare Brain

Q: Is Airfare Brain MCP server safe?

QAmcp's test on 29 Oct 2026: No hidden instructions were found in its tool descriptions. Its error messages showed no secrets or internal details. All 5 of its tools are labeled read-only. Overall it scored 90/100 on 29 Oct 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by airfarebrain.com · https://airfarebrain.com/mcp

True cost of flight extras (bags, seats, fees) on 29 airlines in Europe and North America, sourced.

5 tools✓ all read-only✓ no account neededPricing: not listed

Visit website

90 /100

PASS · WITH NOTES

11 of 11 checks · 29 Oct 2026

Is Airfare Brain MCP server safe?

No hidden instructions were found in its tool descriptions.
Its error messages showed no secrets or internal details.
All 5 of its tools are labeled read-only.
Overall it scored 90/100 on 29 Oct 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

5 tools, in the server's own words.

get_capabilitiesread-only

What Airfare Brain covers: airlines, how fees are researched and dated, what it does NOT do (no live fares, no booking), and what car hire at the destination a…

list_airlinesread-only

List every airline with a fee table: name, IATA code, the date its fees were checked, and its page.

airline_feesread-only

One airline's published extra fees (bags, seats, priority, check-in, changes, payment), each with the price range, when bought (at booking / later / airport), …

true_costread-only

The true cost of a flight on one airline.

trip_at_airportread-only

The whole trip into one airport in one answer: the flight's extras on an airline (bags, seats, fees, as true_cost) AND what car hire there really costs (Car Re…

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Ready for the newest MCP version
1 warning
- !Uses an older MCP version (2025-06-18). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Bad inputs give a clean error
1 warning
- !trip_at_airport: Accepted wrong type for "airport" without complaining
- and 5 more
note
✓
ConnectsConnected in 503 ms
pass
✓
Lists its toolsFound 5 tools
pass
✓
Every tool is describedAll 5 tools and their inputs are described
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No hidden instructionsNo hidden instructions found in tool descriptions
pass
✓
Tools work with good inputs
All good
- ✓get_capabilities: Worked (106 ms)
- ✓list_airlines: Worked (124 ms)
- ✓airline_fees: Answered with an error, probably because of our sample input: {"error":"Unknown airline 'test'.","note":"Known: Aer Lingus (EI), Air Canada (AC), Air France (AF), Alaska Airlines (AS), American Airline…
- ✓true_cost: Answered with an error, probably because of our sample input: {"error":"Unknown airline 'test'.","note":"Known: Aer Lingus (EI), Air Canada (AC), Air France (AF), Alaska Airlines (AS), American Airline…
- ✓trip_at_airport: Worked (123 ms)
pass
✓
Fast enough
All good
- ✓Connecting took 503 ms
- ✓Listing tools took 87 ms
- ✓Average tool answer: 106 ms
- ✓list_airlines: Slowest tool: list_airlines (124 ms)
pass
✓
No secrets leakedChecked 7 error messages: no secrets or internal details
pass
✓
Follows MCP best practices (not scored yet)Tool names, safety labels and tool list size follow the MCP guide
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://airfarebrain.com/mcp

Show this score on GitHub

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[![QAmcp score](https://qamcp.dev/s/com-airfarebrain-airfare-brain.svg)](https://qamcp.dev/s/com-airfarebrain-airfare-brain.html)

Score over time

29 Oct 202690

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use Airfare Brain, signed in with GitHub, one per person. Reviews never change the score.

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