Car Rental Brain
REMOTE · APP.CARRENTALBRAIN.COM
Real cost of car hire at 120+ airports: second driver, cover, deposits, debit cards, desk hours.
Available components
Last scanned (22 hours ago)
Scores higher than 55% of remote servers
Reachable. Last reached 23 Oct 2026.
Category E-commerce
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security63
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS check failed: the endpoint is reachable over plaintext HTTP. See how to fix → View diagnostics → Fail
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability70
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 930 tokens (~155/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management13
- Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 22 Oct 26 +2
- Tool “airport_costs” rewrote its description, which is the text the model reads security
- Tool “build_search_link” rewrote its description, which is the text the model reads security
- Tool “compare_airports” rewrote its description, which is the text the model reads security
- Tool “get_capabilities” rewrote its description, which is the text the model reads security
- Tool “list_airports” rewrote its description, which is the text the model reads security
- Tool “supplier_terms” rewrote its description, which is the text the model reads security
- Schema quality: 120 → 155 ▼ functional
- Tool coverage: 71% → 100% ▲ functional
- Server version: 1.0.0 → 1.0.1 functional
- “build_search_link” reworded the description of “age” cosmetic
- “build_search_link” reworded the description of “automatic” cosmetic
- “build_search_link” reworded the description of “car_type” cosmetic
- “build_search_link” reworded the description of “debit_card” cosmetic
- “build_search_link” reworded the description of “extra_driver” cosmetic
- “compare_airports” reworded the description of “limit” cosmetic
- “compare_airports” reworded the description of “sort_by” cosmetic
- 21 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
- 20 Oct 26 0
- Stability: unverified → 0.03 ▲ functional
- 19 Oct 26 63
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 23 Oct 2026 · Probed https://app.carrentalbrain.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=carrentalbrain.com | CN=YE2,O=Let's Encrypt,C=US | 16 Oct 2026 | 14 Jan 2027 | ECDSA 256 | ECDSA-SHA384 | 57f1f626ae936d16e221f7b929505606c25 |
| SANs: *.carrentalbrain.com, carrentalbrain.com | ||||||
| CN=YE2,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 4df3b15dd6c0784c507cd37b58e6f115 |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of app.carrentalbrain.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| carrentalbrain.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://app.carrentalbrain.com/mcp | Verified | 200 | |
| http (plaintext) | http://app.carrentalbrain.com/mcp | Served over HTTP | 200 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
airport_costs Airport costs ~153
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); by pick-up month; second-driver fees; deposits; debit-card acceptance; desk closing times and out-of-hours fees; policies. Use when someone asks what car hire really costs at one airport, or about deposits, fees or desk hours there.
| Name | Type | Req | Description |
|---|---|---|---|
| airport | string | yes | Airport id, IATA code or name, e.g. 'faro', 'FAO', 'Faro Airport' |
| month | string | – | Optional pick-up month YYYY-MM |
| trip_days | integer | – | Optional trip length in days |
| Name | Type | Req | Description |
|---|---|---|---|
| airport | string | – | – |
| basis | object | – | – |
| by_pickup_month | array|null | – | – |
| country | string | – | – |
| currency | string | – | – |
| deposit | object | – | – |
| desk_hours | object | – | – |
| error | string | – | – |
| iata | string | – | – |
| note | string | – | – |
| payment | object | – | – |
| price_per_day_7_day_hire | object | – | – |
| report_url | string | – | – |
| search_link | string | – | – |
| second_driver | object | – | – |
No examples provided.
build_search_link Build search link ~280
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. Use whenever the person has dates and wants to see or book cars.
| Name | Type | Req | Description |
|---|---|---|---|
| age | integer | – | Main driver's age in years (default 35). Under 25 or over 70 often costs more. |
| airport | string | – | Airport id, IATA code or name, e.g. 'faro', 'FAO', 'Faro Airport' |
| automatic | boolean | – | True for automatic gearbox only. |
| car_type | string | – | Car size; omit for every size. |
| currency | string | – | EUR, GBP, USD... |
| debit_card | boolean | – | True if the driver has no credit card - only cars whose desk takes a debit card for the deposit. |
| dropoff_date | string | – | YYYY-MM-DD |
| dropoff_time | string | – | HH:MM |
| extra_driver | boolean | – | True if a second driver will drive - their fee is then in every total. |
| pickup_date | string | – | YYYY-MM-DD |
| pickup_time | string | – | HH:MM |
| place | string | – | Any city/place if not a measured airport |
| residence | string | – | Two-letter country of residence, e.g. GB |
| Name | Type | Req | Description |
|---|---|---|---|
| about_the_link | string | – | – |
| error | string | – | – |
| note | string | – | – |
| search_link | string | – | – |
No examples provided.
compare_airports Compare airports ~164
Rank airports by real cost (car only / with driver / with cover), typical deposit, debit-card friendliness or late desk hours. Use for 'where in Spain is car hire cheapest in March?' or 'which airport is best for a debit card?'
| Name | Type | Req | Description |
|---|---|---|---|
| airports | array | – | Optional list of airports |
| country | string | – | Optional country to compare within |
| limit | integer | – | How many airports to return (default 10). |
| month | string | – | Optional pick-up month YYYY-MM (price sort uses that month) |
| sort_by | string | – | What to rank by: price (car only), price_with_driver, price_with_cover, deposit (lowest first), debit (most debit-friendly), late_desk (open latest). Default price. |
| Name | Type | Req | Description |
|---|---|---|---|
| airports | array | – | – |
| error | string | – | – |
| note | string | – | – |
| sorted_by | string | – | – |
No examples provided.
get_capabilities Get capabilities ~38
What Car Rental Brain measures, how fresh it is, and which airports/countries are covered. Use first when unsure whether a place is covered.
Input schema present but exposes no named parameters.
| Name | Type | Req | Description |
|---|---|---|---|
| airports_measured | integer | – | – |
| countries | array | – | – |
| error | string | – | – |
| latest_measurement | string | – | – |
| note | string | – | – |
| tools | array | – | – |
No examples provided.
list_airports List airports ~56
Airports we measure, with the typical rental price per day. Filter by country. Use to find an airport id or to list what is covered in a country.
| Name | Type | Req | Description |
|---|---|---|---|
| country | string | – | Optional country, e.g. 'Portugal' |
| Name | Type | Req | Description |
|---|---|---|---|
| airports | array | – | – |
| error | string | – | – |
| note | string | – | – |
No examples provided.
supplier_terms Supplier terms ~104
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 review scores. Use when the person is choosing between suppliers at one airport or asks about a named supplier.
| Name | Type | Req | Description |
|---|---|---|---|
| airport | string | yes | Airport id, IATA code or name, e.g. 'faro', 'FAO', 'Faro Airport' |
| supplier | string | – | Optional supplier name |
| Name | Type | Req | Description |
|---|---|---|---|
| airport | string | – | – |
| error | string | – | – |
| note | string | – | – |
| search_link | string | – | – |
| suppliers | array | – | – |
No examples provided.
How do I install the Car Rental Brain MCP server?
Car Rental Brain is a hosted endpoint at https://app.carrentalbrain.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · app.carrentalbrain.com
claude mcp add --transport http com-carrentalbrain-car-rental-brain 'https://app.carrentalbrain.com/mcp'
What is the Car Rental Brain MCP server?
Car Rental Brain is an MCP server listed in the public MCP registry as com.carrentalbrain/car-rental-brain. Real cost of car hire at 120+ airports: second driver, cover, deposits, debit cards, desk hours. This page covers its hosted endpoint (https://app.carrentalbrain.com/mcp).
Is the Car Rental Brain MCP server safe to use?
Car Rental Brain scores 66 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Car Rental Brain MCP server expose?
Car Rental Brain exposes 6 tools: get_capabilities, list_airports, airport_costs, compare_airports, supplier_terms, build_search_link. Their descriptions and schemas cost roughly 795 tokens of context every time the server is loaded.
Does the Car Rental Brain MCP server require authentication?
No. We connected to Car Rental Brain without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Car Rental Brain MCP server still maintained?
Car Rental Brain is still listed as active in the MCP registry. We last reached this channel on 23 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.