validate_document

KYC: validate a CPF or CNPJ against Receita Federal. Returns registration status (REGULAR / SUSPENSA / CANCELADA / NULA / PENDENTE) and, when authorized, holder name and birth date.

ServerMcp Afip
CategoryRead

How to control validate_document ↓

WHAT IT DOES

What validate_document does on Mcp Afip

AI agents call validate_document 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_document needs a policy

This tool queries identity and tax registration data from Receita Federal (the Brazilian tax authority; note the server is labeled AFIP but references Brazilian CPF/CNPJ identifiers). It retrieves personally identifiable information (name, birth date) and regulatory status.

From the tool's definition Tool description explicitly states it 'validate' and 'Returns registration status...and...holder name and birth date'—a retrieval of KYC (Know Your Customer) data with no modification, deletion, or execution capability.

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

POLICY

How to control validate_document

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_document:

policy.json

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

validate_document 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_document

What does the validate_document tool do? +

KYC: validate a CPF or CNPJ against Receita Federal. Returns registration status (REGULAR / SUSPENSA / CANCELADA / NULA / PENDENTE) and, when authorized, holder name and birth date. 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_document? +

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

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

Can I rate-limit validate_document? +

Yes. Add a rate_limit block to the validate_document 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_document completely? +

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

validate_document 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.

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