get_cep

THE RISK

Low Risk

Why get_cep needs a policy

This is a simple address lookup utility that queries a postal code database and returns corresponding address data. It has no side effects, cannot modify data, execute code, delete records, or commit financial transactions. The blast radius of misuse is minimal — an agent could retrieve addresses for any postal code, but this is low-sensitivity public information already tied to postal codes. Classified as Read.

From the tool's definition Tool name 'get_cep' and description 'Look up address by CEP (Brazilian postal code)' indicate a lookup/query operation that retrieves address information without modifying or executing anything.

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

POLICY

How to control get_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 get_cep:

policy.json

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

get_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 get_cep

What does the get_cep tool do? +

Look up address by CEP (Brazilian postal code). 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 get_cep? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for get_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 get_cep? +

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

Can I rate-limit get_cep? +

Yes. Add a rate_limit block to the get_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 get_cep completely? +

Set action: deny in the PolicyLayer policy for get_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 get_cep? +

get_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 →