retrieve_invoice

THE RISK

Low Risk

Why retrieve_invoice needs a policy

This tool queries and retrieves existing invoice data without creating, modifying, deleting, or triggering external operations. It is purely informational and read-only in nature. The context (AFIP tax invoicing) does not elevate risk since no financial transactions are initiated by retrieval alone.

From the tool's definition Tool description states 'Retrieve an invoice by code' and 'Returns recipient details, status... and the linked charge'. The verb 'retrieve' and 'returns' indicate data querying with no modification or side effects.

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

POLICY

How to control retrieve_invoice

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 retrieve_invoice:

policy.json

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

retrieve_invoice 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.
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 retrieve_invoice

What does the retrieve_invoice tool do? +

Retrieve an invoice by code. Returns recipient details, status (DRAFT, OPEN, VIEWED, PAID, VOID), and the linked charge once payment begins. 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 retrieve_invoice? +

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

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

Can I rate-limit retrieve_invoice? +

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

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

retrieve_invoice 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 →