send_invoice · Fortnox MCP: Risk & Policy

WHAT IT DOES

What send_invoice does on Fortnox

AI agents use send_invoice to commit financial operations through Fortnox — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why send_invoice needs a policy

send_invoice moves real money, and an autonomous agent will call it with the same confidence it calls a search tool. A misread instruction or an injected prompt is all it takes to drain an account or blow a budget.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_invoice Approval-gated

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

View as policy code

policy.json

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

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

FAQ

Questions about send_invoice

What does the send_invoice tool do? +

Send an invoice to the customer via email. It is categorised as a Financial tool in the Fortnox MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on send_invoice? +

Register the Fortnox MCP server in PolicyLayer and add a rule for send_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 Fortnox. Nothing to install.

What risk level is send_invoice? +

send_invoice 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 send_invoice? +

Yes. Add a rate_limit block to the send_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 send_invoice completely? +

Set action: deny in the PolicyLayer policy for send_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 send_invoice? +

send_invoice is provided by the Fortnox MCP server (proviscale/fortnox-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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