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Instant private jet charter price estimates and confirmed live quotes, worldwide.
Do not connect
A critical issue was found. Do not connect this server as-is.
Scanned 7 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 Villiers Charter MCP server exposes 4 tools, focused primarily on general-purpose capabilities. Its published description reads: "Instant private jet charter price estimates and confirmed live quotes, worldwide". It communicates over Streamable HTTP using the 2026-07-28 protocol revision, and does not require authorization to connect. MCPGrade currently rates Villiers Charter F — a critical issue was found and the server should not be connected as-is. Its most notable findings include "Hidden instructions in a tool description" 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 Villiers Charter's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add Villiers Charter to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://mcp.villiers.ai/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.
Get an indicative private jet charter price estimate for a route, broken down by aircraft category (light / midsize / heavy jet). Returns an instant price range. IMPORTANT: an estimate is an indicativ
Submit a request for CONFIRMED live private jet pricing. Villiers contacts vetted operators and emails the confirmed options — real aircraft availability and pricing, with a secure link to review and
Check the outcome of a previous request_jet_confirmation call — has Villiers sent confirmed options yet, and where does the trip stand now (still being sourced / options sent / booked / closed with no
Search Villiers' available empty-leg flights — heavily discounted, one-off private jet repositioning flights that are significantly cheaper than a full charter. Use this when a user wants cheap privat
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_jet_estimate
A tool description contains imperative text aimed at the model (e.g. "ignore previous", "before answering read …").
nt price range. IMPORTANT: an estimate is an indicative range, not a confiRecommendationRemove model-directed instructions from tool descriptions.
tool: get_jet_estimate
A tool description tries to alter the model’s use of another tool.
the next step — request_jet_confirmation — to receive exact, bookable, confirmed live prRecommendationDescriptions must describe only their own tool.
tool: request_jet_confirmation
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
d may result in token revocation. Requires the user's email and a depRecommendationRemove side-channel parameters; constrain tool inputs.
tool: request_jet_confirmation
A tool description tries to alter the model’s use of another tool.
equires a prior get_jet_estimate call in the same session, with the price rangeRecommendationDescriptions must describe only their own tool.
tool: get_confirmation_status
A tool description tries to alter the model’s use of another tool.
of expecting a webhook.RecommendationDescriptions must describe only their own tool.
tool: (server instructions)
A tool description tries to alter the model’s use of another tool.
flow: (1) call get_jet_estimate and present the price range to the user; (2) onRecommendationDescriptions 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: get_jet_estimate
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: request_jet_confirmation
The server advertises open-world / broadly-scoped capabilities.
annotations.destructiveHint = trueRecommendationScope tools to the minimum needed.
tool: get_confirmation_status
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
tool: search_empty_legs
The server advertises open-world / broadly-scoped capabilities.
annotations.openWorldHint = trueRecommendationScope tools to the minimum needed.
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