send_invoice_email

THE RISK

Medium Risk

Why send_invoice_email needs a policy

This tool sends an email, which is a write/communication action with external side effects. It does not create or modify financial records, move money, or delete data. However, misuse could result in sending invoices to wrong recipients or spamming, hence medium severity.

From the tool's definition 'Email an issued invoice to a recipient' — sends an email communication containing an already-issued invoice

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

POLICY

How to control send_invoice_email

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 send_invoice_email:

policy.json

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

send_invoice_email 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 →

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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.
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 send_invoice_email

What does the send_invoice_email tool do? +

Email an issued invoice to a recipient. 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 send_invoice_email? +

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

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

Can I rate-limit send_invoice_email? +

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

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

send_invoice_email 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 →