kyc_lookup_cpf

THE RISK

Low Risk

Why kyc_lookup_cpf needs a policy

Although the tool performs a POST request, its function is to retrieve and validate existing personal data from Brazilian tax and credit authorities (Receita Federal, SPC, Serasa). It queries external databases and returns read-only information.

From the tool's definition Tool description states it 'Validate[s] a CPF' and 'Returns name, DOB, regularity status, restrictions, risk score' — these are retrieval and query operations with no modification of data.

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

POLICY

How to control kyc_lookup_cpf

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 kyc_lookup_cpf:

policy.json

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

kyc_lookup_cpf 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 →

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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 kyc_lookup_cpf

What does the kyc_lookup_cpf tool do? +

Validate a CPF against Receita Federal + SPC / Serasa. Returns name, DOB, regularity status, restrictions, risk score. POST /v1/kyc/cpf. 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 kyc_lookup_cpf? +

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

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

Can I rate-limit kyc_lookup_cpf? +

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

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

kyc_lookup_cpf 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 →