consult_cnpj

THE RISK

Low Risk

Why consult_cnpj needs a policy

This is a lookup/query operation that retrieves existing company data from a Brazilian business registry (CNPJ database). There is no creation, modification, deletion, code execution, or financial transaction involved. The tool purely reads and returns company information, making it a Read category tool with low severity risk.

From the tool's definition Tool name 'consult_cnpj' and description 'Look up Brazilian company data (razão social, status, address) by CNPJ' indicates retrieval of publicly available company registration 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 Ap2, 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 Ap2 — 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 →

Free to start. No card required.

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 Ap2 MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on consult_cnpj? +

Register the Mcp Ap2 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 Ap2. 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 Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Ap2 tool call.

Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →