persons_lookup

THE RISK

Low Risk

Why persons_lookup needs a policy

This tool queries a government tax authority database to retrieve personal identification information (CPF is Brazil's tax ID; AFIP is Argentine equivalent). While it is a read-only operation, the sensitivity of the personal data returned—full name, date of birth, mother's name—elevates severity to medium due to privacy concerns and potential use in identity fraud or social engineering if misused by an unvetted AI…

From the tool's definition Tool performs 'CPF lookup' returning personal identity data (name, DOB, mother). The description explicitly indicates data retrieval with 'no side effects' characteristic of Read operations.

Documented attack patterns abuse exactly the kind of access persons_lookup gives an agent:

POLICY

How to control persons_lookup

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Afip, and nothing reaches the server without passing your rules. This is the rule we recommend for persons_lookup:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "persons_lookup": {}
  }
}

persons_lookup is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Mcp Afip — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about persons_lookup

What does the persons_lookup tool do? +

CPF lookup — name, DOB, mother. It is categorised as a Read tool in the Mcp Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on persons_lookup? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for persons_lookup: 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 Mcp Afip. Nothing to install.

What risk level is persons_lookup? +

persons_lookup is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit persons_lookup? +

Yes. Add a rate_limit block to the persons_lookup 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.

How do I block persons_lookup completely? +

Set action: deny in the PolicyLayer policy for persons_lookup. 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.

What MCP server provides persons_lookup? +

persons_lookup is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →