email_nfse

THE RISK

Medium Risk

Why email_nfse needs a policy

This tool sends an email with a document attachment to a recipient. It creates/triggers an outbound communication (write/send action) but does not delete data or move money. The blast radius is medium — misuse could send tax documents to unintended recipients, potentially leaking sensitive financial data.

From the tool's definition Email the PDF of an already-issued NFS-e to a recipient

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

POLICY

How to control email_nfse

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 email_nfse:

policy.json

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

email_nfse 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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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 email_nfse

What does the email_nfse tool do? +

Email the PDF of an already-issued NFS-e 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 email_nfse? +

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

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

Can I rate-limit email_nfse? +

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

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

email_nfse 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 →