list_postal_codes

THE RISK

Low Risk

Why list_postal_codes needs a policy

This tool performs a straightforward search and retrieval of publicly available postal code information. It has no side effects, does not execute operations, does not modify or delete data, and does not involve financial transactions. The action is purely informational lookup, consistent with the Read category.

From the tool's definition Tool name 'list_postal_codes' and description 'Search addresses by street name or location (returns matching CEPs)' indicate a query/lookup operation that retrieves postal code data without modifying any records.

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

POLICY

How to control list_postal_codes

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_postal_codes:

policy.json

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

list_postal_codes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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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.
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 list_postal_codes

What does the list_postal_codes tool do? +

Search addresses by street name or location (returns matching CEPs). 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_postal_codes? +

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

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

Can I rate-limit list_postal_codes? +

Yes. Add a rate_limit block to the list_postal_codes 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_postal_codes completely? +

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

list_postal_codes 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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