validate_cpf

ServerMcp Afip
CategoryRead

WHAT IT DOES

What validate_cpf does on Mcp Afip

AI agents call validate_cpf to retrieve information from Mcp Afip without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why validate_cpf needs a policy

This tool queries an external Brazilian tax authority database (Receita Federal) to validate CPF information and retrieve status/personal data. While it reads sensitive PII (name, status, birthdate verification), it does not modify, delete, execute commands, or initiate financial transactions. The read-only nature and status-checking function place it in the Read category.

From the tool's definition Tool 'validate_cpf' performs validation and returns status information from Receita Federal registry. No modification, deletion, or execution of arbitrary code. Description states 'Returns { valid, status... name, situation }' indicating data retrieval only.

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

POLICY

How to control validate_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 validate_cpf:

policy.json

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

validate_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.

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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 validate_cpf

What does the validate_cpf tool do? +

IDCloud: validate a Brazilian CPF with Receita Federal. Returns { valid, status (REGULAR | SUSPENSA | TITULAR FALECIDO | CANCELADA | NULA | PENDENTE), name, situation }. Optional birthdate enables a cross-check against the CPF registry. 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 validate_cpf? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for validate_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 validate_cpf? +

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

Can I rate-limit validate_cpf? +

Yes. Add a rate_limit block to the validate_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 validate_cpf completely? +

Set action: deny in the PolicyLayer policy for validate_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 validate_cpf? +

validate_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.

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