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Directory / Car Rental Brain

Car Rental Brain

Q: Is Car Rental 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 6 of its tools are labeled read-only. Overall it scored 70/100 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 carrentalbrain.com · https://app.carrentalbrain.com/mcp

Real cost of car hire at 120+ airports: second driver, cover, deposits, debit cards, desk hours.

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

Visit website

70 /100

FAIL

11 of 11 checks · 29 Oct 2026

Is Car Rental Brain MCP server safe?

No hidden instructions were found in its tool descriptions.
Its error messages showed no secrets or internal details.
All 6 of its tools are labeled read-only.
Overall it scored 70/100 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

6 tools, in the server's own words.

get_capabilitiesread-only

What Car Rental Brain measures, how fresh it is, and which airports/countries are covered.

list_airportsread-only

Airports we measure, with the typical rental price per day.

airport_costsread-only

The true cost of hiring a car at one airport: per-day price for the car alone, with a second driver, with full cover, automatic, no-deposit (from + typical); b…

compare_airportsread-only

Rank airports by real cost (car only / with driver / with cover), typical deposit, debit-card friendliness or late desk hours.

supplier_termsread-only

Per supplier at an airport: typical price per day, second-driver fee, full-cover price, deposit held, whether the desk takes a debit card, and customers' desk …

build_search_linkread-only

A link for the PERSON to open: live prices for their exact dates and needs, ranked by the total they will actually pay, where they can book.

Test results

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

✕
Bad inputs give a clean error
5 failed
- ✕list_airports: Crashed on wrong type for "country"
- ✕airport_costs: Crashed on wrong type for "airport"
- ✕compare_airports: Crashed on wrong type for "country"
- ✕supplier_terms: Crashed on wrong type for "airport"
- ✕build_search_link: Crashed on wrong type for "airport"
- and 2 more
fail
!
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
✓
ConnectsConnected in 829 ms
pass
✓
Lists its toolsFound 6 tools
pass
✓
Every tool is describedAll 6 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 (327 ms)
- ✓list_airports: Worked (609 ms)
- ✓airport_costs: Worked (315 ms)
- ✓compare_airports: Worked (527 ms)
- ✓supplier_terms: Worked (297 ms)
- ✓build_search_link: Answered with an error, probably because of our sample input: {"error": "Give an airport or a place."} {"error":"Give an airport or a place."}
pass
✓
Fast enough
All good
- ✓Connecting took 829 ms
- ✓Listing tools took 181 ms
- ✓Average tool answer: 373 ms
- ✓list_airports: Slowest tool: list_airports (609 ms)
pass
✓
No secrets leakedChecked 8 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://app.carrentalbrain.com/mcp

Show this score on GitHub

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[![QAmcp score](https://qamcp.dev/s/com-carrentalbrain-car-rental-brain.svg)](https://qamcp.dev/s/com-carrentalbrain-car-rental-brain.html)

Score over time

29 Oct 202670

One test so far. New tests will show here.

Reviews

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

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