create_invoice_batch

THE RISK

Critical Risk

Why create_invoice_batch needs a policy

This tool creates financial invoices — up to 250 at a time — which are formal financial documents that commit monetary obligations. Invoices directly trigger payment obligations between parties. The server is explicitly described as an Agent-to-Agent Payment Protocol server, confirming the financial context. Misuse could result in fraudulent or erroneous invoices being issued at scale, making this critical severity.

From the tool's definition create_invoice_batch: 'Create a batch of invoices in a single CAE request (FECAESolicitar, up to 250)'

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

POLICY

How to control create_invoice_batch

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for create_invoice_batch:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_invoice_batch": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to create_invoice_batch is blocked until a human approves it. The rest of the server keeps working.

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Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

Critical-risk tools in Mcp Ap2 → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about create_invoice_batch

What does the create_invoice_batch tool do? +

Create a batch of invoices in a single CAE request (FECAESolicitar, up to 250). It is categorised as a Financial tool in the Mcp Ap2 MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on create_invoice_batch? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for create_invoice_batch: 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 Ap2. Nothing to install.

What risk level is create_invoice_batch? +

create_invoice_batch is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit create_invoice_batch? +

Yes. Add a rate_limit block to the create_invoice_batch 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_invoice_batch completely? +

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

create_invoice_batch is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Ap2 tool call.

Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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