List Banco de Portugal's statistical domains (the full subject tree). Each domain has id, parent_id (tree links; null = top level), label/short_label/description (Portuguese by default), num_series, num_datasets, and has_series. Start here, then use a domain id with list_datasets. lang defaults t...
Part of the Bpstat Pt server.
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AI agents call list_domains to retrieve information from Bpstat Pt 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 list_domains 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.
{
"version": "1",
"default": "deny",
"tools": {
"list_domains": {}
}
}See the full Bpstat Pt policy for all 24 tools.
These attack patterns abuse exactly the kind of access list_domains gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
List Banco de Portugal's statistical domains (the full subject tree). Each domain has id, parent_id (tree links; null = top level), label/short_label/description (Portuguese by default), num_series, num_datasets, and has_series. Start here, then use a domain id with list_datasets. lang defaults to PT; pass "EN" for English.. It is categorised as a Read tool in the Bpstat Pt MCP Server, which means it retrieves data without modifying state.
Register the Bpstat Pt MCP server in PolicyLayer and add a rule for list_domains: 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 Bpstat Pt. Nothing to install.
list_domains 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 list_domains 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 list_domains. 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.
list_domains is provided by the Bpstat Pt MCP server (https://gateway.pipeworx.io/bpstat-pt/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 24 Bpstat Pt tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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