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Validates EU, UK, and Australian VAT numbers against official registries with fraud risk analysis.
Do not connect
A critical issue was found. Do not connect this server as-is.
Scanned 1 month 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 vat-validator-mcp MCP server exposes 2 tools, focused primarily on general-purpose capabilities. Its published description reads: "Validates EU, UK, and Australian VAT numbers against official registries with fraud risk analysis". It communicates over Streamable HTTP using the 2026-07-28 protocol revision, and does not require authorization to connect. MCPGrade currently rates vat-validator-mcp 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 vat-validator-mcp's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add vat-validator-mcp to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://vat-validator-mcp-production.up.railway.appStreamable 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.
Validates a VAT number against live government registries. Call this BEFORE submitting any B2B payment via an agentic payment rail -- at the moment a VAT number appears on a supplier invoice and Strip
Retrieves current VAT rates for a jurisdiction. Call this BEFORE calculating any invoice total or approving any VAT amount -- or immediately after validate_vat passing the country_code from that respo
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: validate_vat
A tool description tries to alter the model’s use of another tool.
his response to get_vat_rates. One call, machine-ready verdict, no further anRecommendationDescriptions must describe only their own tool.
tool: get_vat_rates
A tool description tries to alter the model’s use of another tool.
mediately after validate_vat passing the country_code from that response. UsRecommendationDescriptions 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: validate_vat
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "validate_vat"RecommendationScope tools to the minimum needed.
tool: get_vat_rates
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "get_vat_rates"RecommendationScope tools to the minimum needed.
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