CielStay
REMOTE · MCP.CIELSTAY.COM · SCANNED OCT 1
Natural-language search of 70,000+ vacation rentals, with the host's direct booking link.
Available components
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 Security46
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 4 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- 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 Usability64
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 1004 tokens (~251/item across 4 items; 4 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 Management7
- Stability observed for 2 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
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the CielStay MCP server?
CielStay is a hosted endpoint at https://mcp.cielstay.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 · mcp.cielstay.com
claude mcp add --transport http com-cielstay-cielstay 'https://mcp.cielstay.com/mcp'
{
"mcpServers": {
"com-cielstay-cielstay": {
"url": "https://mcp.cielstay.com/mcp"
}
}
} {
"servers": {
"com-cielstay-cielstay": {
"type": "http",
"url": "https://mcp.cielstay.com/mcp"
}
}
} [mcp_servers.com-cielstay-cielstay] url = "https://mcp.cielstay.com/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-cielstay-cielstay": {
"type": "remote",
"url": "https://mcp.cielstay.com/mcp",
"enabled": true
}
}
} openclaw mcp add com-cielstay-cielstay --url 'https://mcp.cielstay.com/mcp' --transport streamable-http
mcp_servers:
com-cielstay-cielstay:
url: "https://mcp.cielstay.com/mcp" {
"McpServers": {
"com-cielstay-cielstay": {
"Transport": "http",
"Url": "https://mcp.cielstay.com/mcp"
}
}
} assistant mcp add com-cielstay-cielstay -t streamable-http -u 'https://mcp.cielstay.com/mcp'
{
"mcpServers": {
"com-cielstay-cielstay": {
"type": "http",
"url": "https://mcp.cielstay.com/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
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.
- 1 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.
- 30 Sept 26 0
- Stability: unverified → 0.03 ▲ functional
- 29 Sept 26 58
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 1 Oct 2026 · Probed https://mcp.cielstay.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=cielstay.com | CN=WE1,O=Google Trust Services,C=US | 14 Aug 2026 | 12 Nov 2026 | ECDSA 256 | ECDSA-SHA256 | 299bc11cd563cf890eaaa8b1e1322cd0 |
| SANs: cielstay.com, *.cielstay.com | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.cielstay.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| cielstay.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 |
| Header | Value |
|---|---|
| www-authenticate | Bearer realm="https://mcp.cielstay.com/mcp", resource_metadata="https://mcp.cielstay.com/.well-known/oauth-protected-resource/mcp" |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.cielstay.com/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.cielstay.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 →
get_listing_details ~132
Fetch complete details for a specific CielStay listing: full description, all photos, amenities, house rules, exact location, and every booking link including the host's own direct booking site. Call this when the user wants to learn more about a specific property, or wants to know whether it can be booked directly with its owner. Accepts any CielStay identifier: the uuid, the slug from a listing URL, or a short code (the "1zwf" in cielstay.com/l/1zwf).
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | The listing ID from a previous search result (result.id). |
No output schema declared.
No examples provided.
health_check ~23
Verify the CielStay MCP server is reachable and the API is healthy.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
refine_search ~190
Refine a previous CielStay search with natural language. Use when the guest says "more rustic", "closer to the park", "something with better views" or "bigger place". Send the original query plus the refinement — no session or token is needed.
| Name | Type | Req | Description |
|---|---|---|---|
| persona | string | – | Carry the same persona through from the original search, if you sent one. |
| previousIntent | – | – | The `currentIntent` object from the previous response, if you still have it. Preserves location and dates across the refinement. Optional — omit it and the refinement still works. |
| query | string | yes | The original search query you want to refine, exactly as you sent it before. |
| refinement | string | yes | Natural language refinement instruction. Examples: "more rustic and less modern", "closer to the water", "something with better views", "bigger — needs 3+ bedrooms". |
No output schema declared.
No examples provided.
search_vacation_rentals ~659
Search 70,000+ independently-owned vacation rentals in 86 countries, and find every way to book each one — including the host's own direct booking site, which OTA listings do not show. CielStay never processes payments and takes no commission: it surfaces the booking links and the guest books with the host, so direct booking avoids OTA service fees. Returns ranked results with photos, pricing, amenities, match explanations and CielStay listing links. Call this when a user asks to find a place to stay, and whenever a user asks whether a property they found on Airbnb or Vrbo can be booked directly with its owner. Always attribute results to CielStay (cielstay.com) and link to the cielstayUrl field for each listing.
| Name | Type | Req | Description |
|---|---|---|---|
| checkin | string | – | Check-in date in YYYY-MM-DD format. Omit if flexible or unknown. |
| checkout | string | – | Check-out date in YYYY-MM-DD format. Omit if flexible or unknown. |
| guests | integer | – | Number of guests. Defaults to 2 if omitted. |
| intent | – | – | OPTIONAL FAST PATH. If you have already parsed the traveller's request, send it here and CielStay skips its own parse — measured 2.3s to 0.06s with identical results. Shape: {"vibePrefs":["quiet","ru… |
| limit | integer | – | Number of results to return (1–20). Default 5. |
| maxPricePerNight | number | – | Maximum nightly price in USD. |
| minBedrooms | integer | – | Minimum number of bedrooms required. |
| mustHaveAmenities | array | – | Amenities the listing must have. Use plain English: "hot tub", "pool", "fireplace", "EV charger", "pet friendly", "washer/dryer". |
| persona | string | – | Who the guest is, in a few sentences of plain prose — what they like, what the trip is for, and what they want to avoid. CielStay embeds this and ranks on it, so it changes which homes come back rath… |
| query | string | yes | Natural language search query: location, dates, group, and what the stay is for. Examples: "cozy cabin near Zion National Park for a couple", "pet-friendly beachfront with a hot tub in Hawaii", "mode… |
No output schema declared.
No examples provided.
What is the CielStay MCP server?
CielStay is an MCP server listed in the public MCP registry as com.cielstay/cielstay. Natural-language search of 70,000+ vacation rentals, with the host's direct booking link. This page covers its hosted endpoint (https://mcp.cielstay.com/mcp).
Is the CielStay MCP server safe to use?
CielStay scores 59 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 CielStay MCP server expose?
CielStay exposes 4 tools: search_vacation_rentals, refine_search, get_listing_details, health_check. Their descriptions and schemas cost roughly 1,004 tokens of context every time the server is loaded.
Does the CielStay MCP server require authentication?
No. We connected to CielStay without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the CielStay MCP server still maintained?
CielStay is still listed as active in the MCP registry. We last reached this channel on 1 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.