Full NBP exchange-rate table of PLN rates for many currencies at once. Pick a table: A = major currencies (mid-rate), B = other/minor currencies (mid-rate), C = bid/ask trading rates for the major set. Rates are PLN per 1 unit of each currency (per 100 for some minor units). Defaults to the lates...
Part of the Nbp Pl server.
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AI agents use exchange_rate_table to create or modify resources in Nbp Pl. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call exchange_rate_table repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Nbp Pl.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"exchange_rate_table": {
"limits": [
{
"counter": "exchange_rate_table_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Nbp Pl policy for all 23 tools.
These attack patterns abuse exactly the kind of access exchange_rate_table gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Full NBP exchange-rate table of PLN rates for many currencies at once. Pick a table: A = major currencies (mid-rate), B = other/minor currencies (mid-rate), C = bid/ask trading rates for the major set. Rates are PLN per 1 unit of each currency (per 100 for some minor units). Defaults to the latest published table; optionally pass a single date (YYYY-MM-DD) or last_n for the N most recent tables. Weekends/Polish holidays have no data (404).. It is categorised as a Write tool in the Nbp Pl MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Nbp Pl MCP server in PolicyLayer and add a rule for exchange_rate_table: 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 Nbp Pl. Nothing to install.
exchange_rate_table is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the exchange_rate_table 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 exchange_rate_table. 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.
exchange_rate_table is provided by the Nbp Pl MCP server (https://gateway.pipeworx.io/nbp-pl/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 23 Nbp Pl tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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