address_validation

THE RISK

Low Risk

Why address_validation needs a policy

This tool retrieves and validates address information against reference databases, returning standardized data. Despite the POST method, the operation is read-only — it queries external sources (Brazilian postal and geographic databases) to normalize and validate input without creating, modifying, or deleting data. No side effects, no financial impact, no irreversible actions.

From the tool's definition Tool performs address 'normalization + validation' against external databases (CORREIOS + IBGE), returning canonical address, CEP, neighborhood, city, state, geocode.

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

POLICY

How to control address_validation

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 address_validation:

policy.json

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

address_validation 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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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 address_validation

What does the address_validation tool do? +

Address normalization + validation against CORREIOS + IBGE — canonical address, CEP, neighborhood, city, state, geocode. POST /v1/datasets/addresses. 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 address_validation? +

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

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

Can I rate-limit address_validation? +

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

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

address_validation 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 →