consult_cnpj

THE RISK

Low Risk

Why consult_cnpj needs a policy

The tool performs a read-only lookup of company registration data. It retrieves information (company name, status, address) without creating, modifying, deleting, or executing anything. The data retrieved is typically public company registry information. This is a straightforward Read operation with low severity because misuse would only expose publicly available information.

From the tool's definition Tool description states 'Look up Brazilian company data (razão social, status, address) by CNPJ' — this is a query/lookup operation that retrieves publicly available company information with no modification or side effects.

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

POLICY

How to control consult_cnpj

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 consult_cnpj:

policy.json

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

consult_cnpj 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 consult_cnpj

What does the consult_cnpj tool do? +

Look up Brazilian company data (razão social, status, address) by CNPJ. 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 consult_cnpj? +

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

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

Can I rate-limit consult_cnpj? +

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

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

consult_cnpj 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 →