Look up the NBP (National Bank of Poland) exchange rate for a given currency and date.
AI agents call lookup_nbp_rate to retrieve information from Fakturka Api without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The lookup_nbp_rate tool performs a data retrieval operation against the National Bank of Poland's exchange rates. It takes currency and date parameters to fetch historical or current exchange rate information. This is a read-only operation with no side effects—it does not create, modify, delete, or execute code.
From the tool's definition Tool description states 'Look up the NBP exchange rate' - this is a query operation that retrieves exchange rate data without modifying, deleting, or executing external operations.
Attacks that exploit this kind of access
Look up the NBP (National Bank of Poland) exchange rate for a given currency and date. It is categorised as a Read tool in the Fakturka Api MCP Server, which means it retrieves data without modifying state.
Register the Fakturka Api MCP server in PolicyLayer and add a rule for lookup_nbp_rate: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Fakturka Api. Nothing to install.
lookup_nbp_rate 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 lookup_nbp_rate rule in your PolicyLayer 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 PolicyLayer policy for lookup_nbp_rate. 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.
lookup_nbp_rate is provided by the Fakturka Api MCP server (softvoyagers/fakturka-api-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
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