person_check

THE RISK

Low Risk

Why person_check needs a policy

This is a Read operation—it queries and retrieves personal information (name, DOB, restrictions, risk indicators) without modifying any data. However, severity is medium rather than low because: (1) it accesses sensitive PII including date of birth; (2) it retrieves risk indicators that could enable discrimination; (3) misuse could support identity verification attacks or profiling.

From the tool's definition Tool performs KYC validation and returns personal data: 'validate a CPF, return name + DOB + restrictions + risk indicators'. The verb 'validate' and 'return' indicate data retrieval with no modification.

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

POLICY

How to control person_check

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 person_check:

policy.json

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

person_check 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.

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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 person_check

What does the person_check tool do? +

KYC — validate a CPF, return name + DOB + restrictions + risk indicators. POST /v1/checks/person. 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 person_check? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for person_check: 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 person_check? +

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

Can I rate-limit person_check? +

Yes. Add a rate_limit block to the person_check 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 person_check completely? +

Set action: deny in the PolicyLayer policy for person_check. 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 person_check? +

person_check 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 →