duplicate_invoice

THE RISK

Medium Risk

Why duplicate_invoice needs a policy

This tool creates a new invoice by duplicating an existing one with a new due date. It is a reversible write operation (creating a new record) rather than destructive or financial — it does not submit/issue the invoice to AFIP or move money, it simply creates a draft copy.

From the tool's definition Duplicate an existing invoice with a new due date. Endpoint: POST /invoices/:id/duplicate

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

POLICY

How to control duplicate_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 duplicate_invoice:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "duplicate_invoice": {
      "limits": [
        {
          "counter": "duplicate_invoice_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

duplicate_invoice stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about duplicate_invoice

What does the duplicate_invoice tool do? +

Duplicate an existing invoice with a new due date. Endpoint: POST /invoices/:id/duplicate. It is categorised as a Write tool in the Mcp Afip MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on duplicate_invoice? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for duplicate_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 duplicate_invoice? +

duplicate_invoice is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit duplicate_invoice? +

Yes. Add a rate_limit block to the duplicate_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 duplicate_invoice completely? +

Set action: deny in the PolicyLayer policy for duplicate_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 duplicate_invoice? +

duplicate_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 →