upload_voucher_file · Sevdesk MCP: Risk & Policy

WHAT IT DOES

What upload_voucher_file does on Sevdesk

AI agents use upload_voucher_file 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 upload_voucher_file needs a policy

Uploading a file to a voucher is a write operation that creates or adds data to an existing record. While reversible (files can typically be deleted), it modifies the voucher record's state.

From the tool's definition Tool uploads a file to attach to a voucher, creating new data (file attachment) within the accounting system. The description explicitly states 'upload' and 'attach', which are modification operations that persist data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upload_voucher_file Rate-limited

upload_voucher_file 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": {
    "upload_voucher_file": {
      "limits": [
        {
          "counter": "upload_voucher_file_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 upload_voucher_file

What does the upload_voucher_file tool do? +

Upload a file (PDF, image) to attach to a voucher. 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 upload_voucher_file? +

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

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

Can I rate-limit upload_voucher_file? +

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

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

upload_voucher_file 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.