get_invoices

THE RISK

Low Risk

Why get_invoices needs a policy

This tool queries and retrieves invoice data from the AFIP (Argentine tax authority) system. It has no side effects, does not modify, delete, or execute operations—it only fetches existing records. This is a straightforward data retrieval action with minimal risk; the only concern would be information disclosure if unauthorized access occurs, but that is an access control issue rather than a tool capability risk.

From the tool's definition Tool name 'get_invoices' and description 'Get invoices for a link' indicates retrieval operation with no modification or deletion. The verb 'Get' is a canonical Read operation.

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

POLICY

How to control get_invoices

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 get_invoices:

policy.json

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

get_invoices 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.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

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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 get_invoices

What does the get_invoices tool do? +

Get invoices for a link (BR/MX fiscal institutions). 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 get_invoices? +

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

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

Can I rate-limit get_invoices? +

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

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

get_invoices 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 →