create_invoice · FacturaHub MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_invoice does on FacturaHub MCP Server

AI agents use create_invoice to create or update resources in FacturaHub MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FacturaHub MCP Server environment.

WHY IT NEEDS A POLICY

Why create_invoice needs a policy

This tool creates new data (invoices and possibly clients) reversibly, which is a Write operation. However, it has high severity because invoices are financial documents that represent real business obligations and revenue records. While not a financial transaction itself (no money moves), creating invoices commits the business to those obligations and affects accounting records.

From the tool's definition Tool description states 'Create an invoice' and 'if the client does not exist yet, it will be created automatically.' The tool creates new financial records (invoices) and potentially creates new client records.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_invoice Rate-limited

create_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.

View as policy code

policy.json

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

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches FacturaHub MCP Server, so you can run agents against it safely.

FAQ

Questions about create_invoice

What does the create_invoice tool do? +

[FacturaHub] Create an invoice. You can specify the client by name, email, or ID — if the client does not exist yet, it will be created automatically. IMPORTANT — E-INVOICE COMPLIANCE: After creating the invoice, if the user. It is categorised as a Write tool in the FacturaHub MCP Server 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_invoice? +

Register the FacturaHub MCP Server MCP server in PolicyLayer and add a rule for create_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 FacturaHub MCP Server. Nothing to install.

What risk level is create_invoice? +

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

Can I rate-limit create_invoice? +

Yes. Add a rate_limit block to the create_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_invoice completely? +

Set action: deny in the PolicyLayer policy for create_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_invoice? +

create_invoice is provided by the FacturaHub MCP Server MCP server (santy1422/facturahub-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.