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Verifies Polish companies by NIP/KRS and validates EU VAT numbers via VIES from official registries.
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 skanfirmy-mcp MCP server exposes 14 tools, focused primarily on communication capabilities. Its published description reads: "Verifies Polish companies by NIP/KRS and validates EU VAT numbers via VIES from official registries". It communicates over Streamable HTTP using the 2026-07-28 protocol revision, and does not require authorization to connect. MCPGrade currently rates skanfirmy-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 "Tool input schema requests a secret". 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 skanfirmy-mcp's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add skanfirmy-mcp to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://skanfirmy.pl/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.
Sprawdza status VAT (Biała Lista Podatników VAT) i dane z KRS dla polskiej firmy po numerze NIP.
Sprawdza zbiorczo listę do 30 NIP-ów w jednym zapytaniu do Wykazu VAT (Biała Lista) Ministerstwa Finansów — status VAT, rachunki bankowe, REGON, KRS i adres każdego podmiotu. Do weryfikacji portfela k
Sprawdza dane podmiotu w rejestrze REGON (GUS, Baza Internetowa REGON) po numerze NIP: numer REGON, oficjalna nazwa urzędowa, forma (osoba prawna/fizyczna), pełny adres (województwo, powiat, gmina). O
Sprawdza ważność unijnego numeru VAT kontrahenta w systemie VIES (Komisja Europejska).
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: sprawdz_lista_nip
A tool description tries to alter the model’s use of another tool.
S (do tego użyj sprawdz_nip dla pojedynczych).RecommendationDescriptions must describe only their own tool.
tool: observe_nip
The input schema declares a parameter that asks the caller to hand over a password, key, token, or other secret — a credential-harvest / token-passthrough risk. (Bare pagination `token` params are excluded.)
parameter "api_key"RecommendationNever pass secrets as tool arguments; authenticate out-of-band and remove credential parameters from the schema.
tool: unobserve_nip
The input schema declares a parameter that asks the caller to hand over a password, key, token, or other secret — a credential-harvest / token-passthrough risk. (Bare pagination `token` params are excluded.)
parameter "api_key"RecommendationNever pass secrets as tool arguments; authenticate out-of-band and remove credential parameters from the schema.
tool: list_observations
The input schema declares a parameter that asks the caller to hand over a password, key, token, or other secret — a credential-harvest / token-passthrough risk. (Bare pagination `token` params are excluded.)
parameter "api_key"RecommendationNever pass secrets as tool arguments; authenticate out-of-band and remove credential parameters from the schema.
tool: changes_since
The input schema declares a parameter that asks the caller to hand over a password, key, token, or other secret — a credential-harvest / token-passthrough risk. (Bare pagination `token` params are excluded.)
parameter "api_key"RecommendationNever pass secrets as tool arguments; authenticate out-of-band and remove credential parameters from the schema.
tool: set_webhook
A tool exposes a free-text/webhook/feedback parameter with no honest purpose — a classic exfil channel.
cz webhook)."},"api_key":{"type":"string","description":"Klucz API skanRecommendationRemove side-channel parameters; constrain tool inputs.
tool: set_webhook
The input schema declares a parameter that asks the caller to hand over a password, key, token, or other secret — a credential-harvest / token-passthrough risk. (Bare pagination `token` params are excluded.)
parameter "api_key"RecommendationNever pass secrets as tool arguments; authenticate out-of-band and remove credential parameters from the schema.
tool: (server instructions)
A tool description tries to alter the model’s use of another tool.
j). Zawiera też szukaj_katalog_api — przeszukiwanie otwarteAPI.pl, katalogu innychRecommendationDescriptions 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: set_webhook
The server advertises open-world / broadly-scoped capabilities.
no annotations on write-capable tool "set_webhook"RecommendationScope 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.
Sprawdza, czy numer rachunku bankowego (NRB) figuruje w Wykazie VAT (Biała Lista) dla danego NIP — należyta staranność przy przelewach powyżej 15 000 zł.
Generuje indywidualny mikrorachunek podatkowy (do wpłat PIT/CIT/VAT) na podstawie NIP lub PESEL.
Wyszukuje kody klasyfikacji PKD 2025 po nazwie działalności lub numerze kodu.
Oblicza odsetki ustawowe lub za transakcje handlowe (B2B) za opóźnienie w płatności, z rozbiciem na okresy obowiązywania stawki NBP.
Przeszukuje otwarteAPI.pl — katalog publicznych API Polski i Unii Europejskiej (VAT, KRS, GUS, NBP, EBC, Eurostat i inne). Zwraca pasujące wpisy z linkiem do oficjalnej dokumentacji każdego API. Puste
Dodaje NIP do monitoringu — będziesz dostawać powiadomienia (i przez zmiany_od / e-mail), gdy zmieni się status VAT lub rachunek bankowy na Białej Liście MF. Wymaga klucza API skanfirmy (Authorization
Usuwa NIP z monitoringu. Wymaga klucza API skanfirmy.
Zwraca listę NIP-ów, które monitorujesz, wraz z ich aktualnym statusem VAT i datą ostatniego sprawdzenia. Wymaga klucza API skanfirmy.
Zwraca zmiany (status VAT / rachunki bankowe) wykryte od podanej daty dla obserwowanych przez Ciebie NIP-ów. Kanał pollingowy dla agentów. Wymaga klucza API skanfirmy.
Ustawia (lub usuwa) URL webhooka push dla Twojego monitoringu — zamiast/oprócz polling. Gdy wykryjemy zmianę u obserwowanego NIP-u, wyślemy POST z podpisem HMAC-SHA256 (nagłówek X-Skanfirmy-Signature)