update_invoice_position · Sevdesk MCP: Risk & Policy

WHAT IT DOES

What update_invoice_position does on Sevdesk

AI agents use update_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 update_invoice_position needs a policy

This tool modifies financial accounting documents (invoice positions) reversibly, which places it in the Write category rather than Execute or Destructive. However, the severity is high because invoices are critical financial records—misuse could alter transaction history, amounts due, or tax records.

From the tool's definition Tool name 'update_invoice_position' and description 'Update an existing invoice position' directly indicate modification of invoice data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_invoice_position Rate-limited

update_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": {
    "update_invoice_position": {
      "limits": [
        {
          "counter": "update_invoice_position_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 update_invoice_position

What does the update_invoice_position tool do? +

Update an existing invoice position. 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 update_invoice_position? +

Register the Sevdesk MCP server in PolicyLayer and add a rule for update_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 update_invoice_position? +

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

Can I rate-limit update_invoice_position? +

Yes. Add a rate_limit block to the update_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 update_invoice_position completely? +

Set action: deny in the PolicyLayer policy for update_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 update_invoice_position? +

update_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.