download_invoice_xml

THE RISK

Low Risk

Why download_invoice_xml needs a policy

This tool retrieves and returns an existing invoice document in XML format via a download URL. It performs a read-only query operation without modifying, deleting, or executing any code. No financial transactions, destructive operations, or external code execution are involved.

From the tool's definition Tool name is 'download_invoice_xml' and description states 'Download invoice as XML (returns download URL)'. The verb 'download' and the action of retrieving/returning a URL indicate data retrieval with no side effects.

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

POLICY

How to control download_invoice_xml

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 download_invoice_xml:

policy.json

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

download_invoice_xml 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 download_invoice_xml

What does the download_invoice_xml tool do? +

Download invoice as XML (returns download URL). 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 download_invoice_xml? +

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

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

Can I rate-limit download_invoice_xml? +

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

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

download_invoice_xml 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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