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Search and book hotels across 100k+ properties with real reservation capabilities.
Do not connect
A critical issue was found. Do not connect this server as-is.
Scanned 26 days ago Due for re-check
A server can change after it's graded. Re-run the automated scan to refresh this report.
This grade is deterministic and reproducible: the same server surface always yields the same grade under a given algorithm version. It is a real automated assessment computed by the MCPGrade engine from what the probe actually observed — not a fabricated or opinion score. It is not a manual human pentest, so it can miss context-specific risks.
Every signal below was measured directly by the automated probe. The grade is derived only from evidence like this — nothing is assumed.
The 1stay MCP server exposes 8 tools, focused primarily on general-purpose capabilities. Its published description reads: "Search and book hotels across 100k+ properties with real reservation capabilities". It communicates over Streamable HTTP using the 2025-06-18 protocol revision, and does not require authorization to connect. MCPGrade currently rates 1stay F — a critical issue was found and the server should not be connected as-is. Its most notable findings include "Cross-tool shadowing" and "Cross-tool shadowing". This report is a deterministic, reproducible automated assessment: the same observed surface always yields the same grade under a given algorithm version, and it is refreshed as new scans arrive and free to read — but it is not a substitute for a manual human security review. Always re-check 1stay's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add 1stay to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://mcp.stayker.com/mcpStreamable HTTP transport. This is the MCP endpoint, not a website — paste it into your MCP client server list rather than a browser.
Captured passively during the read-only scan. Click any value to find servers that match it.
The tools this server advertises via tools/list — names, purposes, and the parameters each accepts, exactly as enumerated read-only.
Search hotels by location and dates for exactly one room, with check-in up to 340 days from today. Returns available properties with nightly rates across major brands, boutique, and independent hotels
Sorted worst-first. Each finding shows its severity, what it means, its OWASP MCP Top-10 mapping, and a recommended fix — the check id links to the exact methodology row that produced it.
tool: get_hotel_details
A tool description tries to alter the model’s use of another tool.
RecommendationDescriptions must describe only their own tool.
tool: book_hotel
A tool description tries to alter the model’s use of another tool.
rate_code from get_hotel_details, valid approximately 15 minutes. Expired codesRecommendationDescriptions must describe only their own tool.
tool: resend_confirmation
A tool description tries to alter the model’s use of another tool.
are handled at https://stayker.com/service.RecommendationDescriptions must describe only their own tool.
tool: get_booking
A tool description tries to alter the model’s use of another tool.
token issued by lookup_booking and scoped to a single booking. Without a validRecommendationDescriptions must describe only their own tool.
The server accepts tool enumeration (and likely invocation) with no authentication.
RecommendationRequire OAuth 2.1 authorization for any server exposing non-public tools.
tool: search_hotels
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: get_hotel_details
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: book_hotel
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: resend_confirmation
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: cancel_booking
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
Vantaj uptime monitoring via MCP — manage monitors, heartbeats, incidents, and status pages.
Unified gateway to Algeria's TKAWEN ecosystem: commerce, certification, and AI tools.
Provides access to the Cohereon Doctrine AI safety framework with governance components, tiered access, and agent onboarding.
Agentic rails for complex workflows with receipts, fees, and MCP tool access.
Structural TC39 spec lookup for ECMA-262 and ECMA-402 in AI agents, SHA-pinned and offline-first.
Structural TC39 spec lookup for ECMA-262 and ECMA-402 in AI agents, SHA-pinned and offline-first.
Get rates and room details for exactly one room at a specific hotel. Returns room types, live rates, amenities, cancellation policies, and rate_codes required by book_hotel. Guest pays the hotel direc
Book exactly one hotel room. The first 1Stay release does not support multi-room searches or reservations. Returns a secure checkout URL. This tool accepts no guest identity or payment fields. Name, e
Look up a reservation by verifying the guest's identity. Returns the confirmation number and booking summary in conversation. Requires the guest's full name plus either the hotel confirmation number,
Resend a hotel reservation confirmation email. Use either the confirmation number from a successful lookup_booking call, or the guest's full name and email address when they do not know their confirma
Look up a reservation exclusively by the hotel confirmation number shown in the guest's confirmation email. Internal Stayker booking IDs are never accepted or disclosed by MCP. Returns full booking de
Create a secure cancellation handoff for a hotel reservation. After verifying the guest, this tool returns the hotel cancellation policy on file and a first-party 1Stay cancellation URL. It never canc
List available 1Stay hotel booking tools. An optional keyword filters by search, book, cancel, or details; absence of a keyword returns all tools.