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Directory / CielStay
CielStay
by cielstay.com · https://mcp.cielstay.com/mcp
The free AI index for direct booking homes. Any channel, or straight to the host.
13 of 13 checks · 31 Oct 2026
Is CielStay MCP server safe?
- None of the hidden-instruction wordings we know were found in its tool descriptions.
- Its error messages showed no secrets or internal details.
- 6 of its 7 tools are labeled read-only; the others may change or send things.
- Overall it scored 92/100 on 31 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
7 tools, in the server's own words.
search_vacation_rentalsread-onlySearch about 70,000 vacation rentals and longer-stay homes from independent hosts and property managers in 70+ countries and territories.
refine_searchread-onlyRefine a previous CielStay search in natural language, such as "more rustic", "closer to the park", "better views", "bigger place" or "with ping pong".
get_listing_detailsread-onlyFull details for one CielStay listing: description, photos, amenities, house rules, location, and every booking link CielStay holds, including the host's own b…
contact_hostSends a traveller's first message to a home's host through CielStay: questions, dates and party, a request to book, or a monthly or long-stay inquiry.
get_propertyread-onlyEvery unit at one multi-unit property: a hotel, glamping site or building whose units share a booking site and a location.
find_direct_bookingread-onlyLook up one named property and every way it can be booked, including the host's or manager's own site.
health_checkread-onlyCheck that the CielStay MCP server is reachable and the API is healthy.
Test results
Safe mode: only tools labeled read-only were run. How the test works
- ✕Fast enoughfail
1 failed, 1 warning
- !Average tool answer: 3.0 s
- ✕search_vacation_rentals: Slowest tool: search_vacation_rentals (13.8 s): most users will give up waiting
- and 2 more
- !Ready for the newest MCP versionnote
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
- ✓ConnectsConnected in 357 mspass
- ✓Lists its toolsFound 7 toolspass
- ✓Every tool is describedAll 7 tools and their inputs are describedpass
- ✓Tools are labeled safe or dangerousEvery tool has a safety labelpass
- ✓No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.pass
- ✓Tools work with good inputspass
All good
- ✓search_vacation_rentals: Worked (13.8 s)
- ✓refine_search: Worked (3.6 s)
- ✓get_listing_details: Worked (248 ms)
- ✓get_property: Worked (51 ms)
- ✓find_direct_booking: Answered with an error, probably because of our sample input: Supply otaUrl (preferred) or propertyName.
- ✓health_check: Worked (42 ms)
- –contact_host: Not run: labeled as changing data
- ✓Bad inputs give a clean errorpass
All good
- ✓search_vacation_rentals: Refused missing required input "query" with a clear error
- ✓search_vacation_rentals: Refused wrong type for "query" with a clear error
- ✓refine_search: Refused missing required input "query" with a clear error
- ✓refine_search: Refused wrong type for "query" with a clear error
- ✓get_listing_details: Refused missing required input "id" with a clear error
- ✓get_listing_details: Refused wrong type for "id" with a clear error
- ✓get_property: Refused missing required input "id" with a clear error
- ✓get_property: Refused wrong type for "id" with a clear error
- and 1 more
- ✓Tools work togetherpass
2 chains working
- ✓search_vacation_rentals → get_listing_details: get_listing_details found what search_vacation_rentals returned (id = "669ae83a408d3a833f794842")
- ✓refine_search → get_listing_details: get_listing_details found what refine_search returned (id = "669ae83a408d3a833f794842")
- ✓No secrets leakedChecked 10 error messages: no secrets or internal detailspass
- ✓Follows MCP best practices (not scored yet)Tool names, safety labels and tool list size follow the MCP guidepass
- ✓Resources and prompts workpass
All good (1 resource)
- ✓Opened 1 of 1 resources
- ✓An address that does not exist gets a clean "not found" error
Test it yourself
Free and open source. Same checks, same score.
npx qamcp-cli https://mcp.cielstay.com/mcpShow this score on GitHub
Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.
[](https://qamcp.dev/s/com-cielstay-cielstay.html)Score over time
- 31 Oct 202692
One test so far. New tests will show here.
Reviews
Coming soon: reviews from people who use CielStay, signed in with GitHub, one per person. Reviews never change the score.
QAmcp Monitor (coming soon) tests it every hour and emails you when it goes down, the score drops, a tool changes or a secret leaks. You'll also be able to claim this page and get a verified owner mark. Founding price: $19/month for life for the first 50 teams.
Have a concern, or want it removed? Ask us and we'll take it off the list. How the directory works