Qualifizierte Bestätigung nach §6a UStG (BZSt eVatR). Prüft die USt-IdNr des Geschäftspartners und vergleicht Name, Ort, PLZ und Straße mit den offiziellen Daten des Mitgliedstaats. Ergebniscodes pro Feld: - A = Übereinstimmung - B = Keine Übereinstimmung - C = Nicht ang...
Part of the Ustidnr MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call qualified_confirmation to retrieve information from Ustidnr without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though qualified_confirmation only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
tools:
qualified_confirmation:
rules:
- action: allowSee the full Ustidnr policy for all 3 tools.
Agents calling read-class tools like qualified_confirmation have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
Qualifizierte Bestätigung nach §6a UStG (BZSt eVatR). Prüft die USt-IdNr des Geschäftspartners und vergleicht Name, Ort, PLZ und Straße mit den offiziellen Daten des Mitgliedstaats. Ergebniscodes pro Feld: - A = Übereinstimmung - B = Keine Übereinstimmung - C = Nicht angefragt - D = Vom Mitgliedstaat nicht unterstützt Args: own_vat_id: Eigene deutsche USt-IdNr (z.B. DE123456789). partner_vat_id: USt-IdNr des Geschäftspartners. company_name: Erwarteter Firmenname des Partners. city: Erwarteter Ort des Partners. zip_code: Erwartete PLZ des Partners. street: Erwartete Straße des Partners. . It is categorised as a Read tool in the Ustidnr MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for qualified_confirmation. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Ustidnr MCP server.
qualified_confirmation is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the qualified_confirmation rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the Intercept policy for qualified_confirmation. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
qualified_confirmation is provided by the Ustidnr MCP server (mavengence/ustidnr-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept