list_cep_ranges

THE RISK

Low Risk

Why list_cep_ranges needs a policy

This tool retrieves shipping service coverage information (CEP postal code ranges) without creating, modifying, deleting, executing code, or moving money. It is a straightforward read operation with minimal blast radius if misused by an AI agent.

From the tool's definition Tool name is 'list_cep_ranges' and description states it 'List CEP ranges' — a retrieval operation with no modification or execution implied. CEP (Código de Endereçamento Postal) is Brazilian postal code data; listing ranges is a query-only operation.

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

POLICY

How to control list_cep_ranges

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 list_cep_ranges:

policy.json

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

list_cep_ranges 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.

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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.
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FAQ

Questions about list_cep_ranges

What does the list_cep_ranges tool do? +

List CEP ranges (faixas de CEP) served by a given shipping service. 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 list_cep_ranges? +

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

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

Can I rate-limit list_cep_ranges? +

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

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

list_cep_ranges 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.

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