create_service_invoice

THE RISK

Medium Risk

Why create_service_invoice needs a policy

This tool creates a new financial document (NFS-e - Nota Fiscal de Serviço) within the Argentine tax authority's electronic invoicing system. While it is reversible through subsequent corrections or cancellations (thus Write rather than Destructive), it has high severity because: (1) it commits official tax documentation, (2) it affects tax records and compliance obligations, and (3) misuse could create fraudulent…

From the tool's definition The tool 'create_service_invoice' creates a service invoice (NFS-e) in Bling, an electronic invoicing system. The description explicitly states 'Create', indicating data creation.

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

POLICY

How to control create_service_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 create_service_invoice:

policy.json

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

create_service_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.

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EXPLORE

Related tools and policies

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Financial authorize_transaction Authorize a transaction (reserve funds without capturing) via Braintree GraphQL authorizeP Financial cancel_collection Cancel a scheduled collection request Financial cancel_credit Cancel an authorized-but-uncaptured credit payment. Financial cancel_payment Attempt to cancel a payment that has not yet settled. Iniciador endpoint: POST /payments/{ Financial cancel_payment_intent Cancel a payment intent that has not yet been captured. Fails on already-captured intents; Financial cancel_recurrence Cancel an active recurrence. Future charges will stop; already-charged cycles are untouche Financial cancel_subscription Cancel a subscription by ID Financial revoke_token Revoke an issued access_token or refresh_token at POST /v1/token/revoke. Use to terminate

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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 create_service_invoice

What does the create_service_invoice tool do? +

Create a service invoice (NFS-e) in Bling. 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 create_service_invoice? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for create_service_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 create_service_invoice? +

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

Can I rate-limit create_service_invoice? +

Yes. Add a rate_limit block to the create_service_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 create_service_invoice completely? +

Set action: deny in the PolicyLayer policy for create_service_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 create_service_invoice? +

create_service_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.

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