find_cep

THE RISK

Low Risk

Why find_cep needs a policy

This is a straightforward lookup/search operation with no side effects. It retrieves existing address data without creating, modifying, deleting, or executing any operations. The tool has minimal blast radius—incorrect address lookups would not cause financial loss, data destruction, or execution of unwanted operations.

From the tool's definition Tool name 'find_cep' and description 'Look up address by CEP via Correios' indicate a data retrieval operation. CEP is the Brazilian postal code system, and Correios is the Brazilian postal service.

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

POLICY

How to control find_cep

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 find_cep:

policy.json

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

find_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 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 →

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 find_cep

What does the find_cep tool do? +

Look up address by CEP via Correios. 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 find_cep? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for find_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 Afip. Nothing to install.

What risk level is find_cep? +

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

Can I rate-limit find_cep? +

Yes. Add a rate_limit block to the find_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 find_cep completely? +

Set action: deny in the PolicyLayer policy for find_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 find_cep? +

find_cep 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 →