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Car Rental Brain MCP server

Which MCP servers are Car Rental Brain's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-28

← Back to Car Rental Brain

Whose server it is
  • Registry namecom.carrentalbrain/car-rental-brainverified in the MCP registry

The registry name sits under carrentalbrain.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-28
  • Stateanswerschecked 2026-10-28
  • Tools6
  • Server calls itselfcar-rental-brain
  • Server version1.1.0
  • Protocol version2025-06-18

On 2026-10-28 the server answered initialize and tools/list without a sign-in. First answer in 656 ms.

Should an agent connect itNot proven either way yet
  • Its tools do compare total car hire cost including second driver fees; check deposit amounts and card requirements before pickup, but not rebook an existing car hire booking when prices drop.
  • Checked on 6 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 6, the first on 2026-10-28
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 6 so far
  • What an agent can do with it2 of 3 use cases
  • Answeredmeasuring6 of the 7 daily checks it takes to print a share
  • Median first answer561 ms
  • Space in an agent's context≈ 1,138 tokensthe definitions of all its tools (6), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results6 of 6 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • can do · compare total car hire cost including second driver fees
  • can do · check deposit amounts and card requirements before pickup
  • cannot · rebook an existing car hire booking when prices drop

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers6 tools · read 2026-10-28
  • get_capabilities

    What Car Rental Brain measures, how fresh it is, and which airports/countries are covered. Use first when unsure whether a place is covered.

  • list_airports

    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.

  • airport_costs

    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…

  • compare_airports

    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?'

  • supplier_terms

    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…

  • build_search_link

    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.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "car-rental-brain": {
      "type": "http",
      "url": "https://app.carrentalbrain.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http carrentalbrain https://app.carrentalbrain.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://app.carrentalbrain.com/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.