consultar_cep

THE RISK

Low Risk

Why consultar_cep needs a policy

This tool retrieves postal code information from a public Brazilian database. It performs a read-only lookup with no side effects, data modification, or execution of arbitrary operations. Even if misused by an agent, it can only retrieve publicly available information, posing minimal risk.

From the tool's definition Tool name 'consultar_cep' (consult/query CEP) indicates a lookup operation. CEP is the Brazilian postal code system.

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

POLICY

How to control consultar_cep

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Brasil API, and nothing reaches the server without passing your rules. This is the rule we recommend for consultar_cep:

policy.json

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

consultar_cep 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 Brasil API — 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

Related tools and policies

More MCP Brasil API tools

Read consultar_banco Obtém informações de um banco brasileiro. Read consultar_banco_info Obtém informações de um banco específico pelo código. Read consultar_cambio Obtém informações de uma lista de moedas de cambio. Read consultar_cambio_info consultar_cambio_info Read consultar_cnpj Obtém informações para um CNPJ brasileiro. Read consultar_ddd consultar_ddd Read consultar_feriados consultar_feriados Read consultar_taxa_oficial consultar_taxa_oficial

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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 consultar_cep

What does the consultar_cep tool do? +

consultar_cep. It is categorised as a Read tool in the MCP Brasil API MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on consultar_cep? +

Register the MCP Brasil API MCP server in PolicyLayer and add a rule for consultar_cep: 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 Brasil API. Nothing to install.

What risk level is consultar_cep? +

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

Can I rate-limit consultar_cep? +

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

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

consultar_cep is provided by the MCP Brasil API MCP server (lucianfialho/mcp-brasil-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Brasil API tool call.

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

CHECK YOUR STACK →