book_invoice_payment · Sevdesk MCP: Risk & Policy

WHAT IT DOES

What book_invoice_payment does on Sevdesk

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

WHY IT NEEDS A POLICY

Why book_invoice_payment needs a policy

This tool modifies invoice payment records in an accounting system, making it a Write operation rather than Financial (which would involve actual money movement). However, the high severity reflects that misuse could corrupt accounting records or create false payment documentation, affecting financial reconciliation and compliance.

From the tool's definition Tool name 'book_invoice_payment' and description 'Book a payment on an invoice in sevdesk' indicate modification of invoice payment status in an accounting system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

book_invoice_payment Rate-limited

book_invoice_payment 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": {
    "book_invoice_payment": {
      "limits": [
        {
          "counter": "book_invoice_payment_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 Sevdesk, so you can run agents against it safely.

FAQ

Questions about book_invoice_payment

What does the book_invoice_payment tool do? +

Book a payment on an invoice in sevdesk. It is categorised as a Write tool in the Sevdesk MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on book_invoice_payment? +

Register the Sevdesk MCP server in PolicyLayer and add a rule for book_invoice_payment: 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 Sevdesk. Nothing to install.

What risk level is book_invoice_payment? +

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

Can I rate-limit book_invoice_payment? +

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

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

book_invoice_payment is provided by the Sevdesk MCP server (codestra/sevdesk-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.