CarRentalList

Is CarRentalList MCP server safe?

• No hidden instructions were found in its tool descriptions.
• Its error messages showed no secrets or internal details.
• All 13 of its tools are labeled read-only.
• Overall it scored 96/100 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

13 tools, in the server's own words.

Test results

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

• !
  Follows MCP best practices (not scored yet)

  2 tips (not scored)

  • !Very common tool names: search, fetch. Next to other servers' tools the AI may mix them up; a short prefix helps (like "github_search" instead of "search").
  • !The tool list is about 58 KB (roughly 14k tokens). AI apps send it with every message, so it takes that much of the AI's memory before any work starts.
  note
• !
  Resources and prompts work

  3 warnings (2 resources, 2 templates, 3 prompts)

  • !plan_exotic_weekend: Could not open it with sample inputs: Invalid arguments for plan_exotic_weekend: ✖ a daily amount in USD, e.g. 800 → at budget_per_day
  • !compare_companies: Could not open it with sample inputs: Invalid arguments for compare_companies: ✖ at least 2 slugs → at slugs
  • !find_my_car: Could not open it with sample inputs: Invalid arguments for find_my_car: ✖ a daily amount in USD, e.g. 800 → at max_daily ✖ an age in years, 18-99, e.g. 23 → at driver_age
  • and 4 more
  note
• ✓
  ConnectsConnected in 471 ms
  pass
• ✓
  Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
  pass
• ✓
  Lists its toolsFound 13 tools
  pass
• ✓
  Every tool is describedAll 13 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

  • ✓search_vehicles: Worked (673 ms)
  • ✓get_company: Answered with an error, probably because of our sample input: No company "test" in the catalog. Use search_vehicles or browse_locations to find companies.
  • ✓browse_locations: Worked (123 ms)
  • ✓browse_makes: Worked (38 ms)
  • ✓vehicle_availability: Worked (57 ms)
  • ✓search_companies: Worked (135 ms)
  • ✓price_overview: Worked (57 ms)
  • ✓catalog_highlights: Worked (196 ms)
  • and 5 more
  pass
• ✓
  Bad inputs give a clean error

  All good

  • ✓search_vehicles: Refused wrong type for "query" with a clear error
  • ✓get_company: Refused missing required input "slug" with a clear error
  • ✓get_company: Refused wrong type for "slug" with a clear error
  • ✓browse_locations: Refused wrong type for "state" with a clear error
  • ✓browse_makes: Refused wrong type for "state" with a clear error
  • ✓vehicle_availability: Refused missing required input "model" with a clear error
  • ✓vehicle_availability: Refused wrong type for "model" with a clear error
  • ✓search_companies: Refused wrong type for "state" with a clear error
  • and 11 more
  pass
• ✓
  Tools work together

  5 chains working

  • ✓search_vehicles → get_company: get_company found what search_vehicles returned (slug = "california-auto-rental")
  • ✓search_companies → get_company: get_company found what search_companies returned (slug = "california-auto-rental")
  • ✓price_overview → get_company: get_company found what price_overview returned (slug = "realcar")
  • ✓catalog_highlights → get_company: get_company found what catalog_highlights returned (slug = "dfw-luxury-car-rental")
  • ✓top_companies → get_company: get_company found what top_companies returned (slug = "veluxity")
  pass
• ✓
  Fast enough

  All good

  • ✓Connecting took 471 ms
  • ✓Listing tools took 42 ms
  • ✓Average tool answer: 151 ms
  • ✓search_vehicles: Slowest tool: search_vehicles (673 ms)
  pass
• ✓
  No secrets leakedChecked 42 error messages: no secrets or internal details
  pass

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Score over time

• 29 Oct 202696

One test so far. New tests will show here.

Reviews

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