create_invoice_position · Sevdesk MCP: Risk & Policy

WHAT IT DOES

What create_invoice_position does on Sevdesk

AI agents use create_invoice_position 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 create_invoice_position needs a policy

This tool creates new line items on invoices, which modifies financial documents. While creation is reversible (Write category), it directly impacts accounting records and invoiced amounts. It does not move money (Financial category) nor delete data (Destructive), but the impact on financial records and invoice totals justifies 'high' severity.

From the tool's definition Tool name is 'create_invoice_position' and description states 'Create a new position on an invoice'. The verb 'Create' and 'new position' indicate data creation/modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_invoice_position Rate-limited

create_invoice_position 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_position": {
      "limits": [
        {
          "counter": "create_invoice_position_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

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 create_invoice_position

What does the create_invoice_position tool do? +

Create a new position on an invoice. 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 create_invoice_position? +

Register the Sevdesk MCP server in PolicyLayer and add a rule for create_invoice_position: 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 create_invoice_position? +

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

Can I rate-limit create_invoice_position? +

Yes. Add a rate_limit block to the create_invoice_position 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_position completely? +

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

create_invoice_position 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.