duplicate_invoice · Clockify Time Tracking MCP

WHAT IT DOES

What duplicate_invoice does on Clockify Time Tracking

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

WHY IT NEEDS A POLICY

Why duplicate_invoice needs a policy

Duplicating an invoice creates a new financial document, which is a reversible write operation. While this involves financial data, the action itself (copying) is not irreversible and does not directly transfer money. It merits Write category with medium severity due to potential for creating duplicate billing records that could cause accounting confusion or erroneous double-billing if not caught.

From the tool's definition Tool name 'duplicate_invoice' indicates creating a copy of an invoice record. Description is empty, limiting direct evidence.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

duplicate_invoice Rate-limited

duplicate_invoice 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": {
    "duplicate_invoice": {
      "limits": [
        {
          "counter": "duplicate_invoice_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 Clockify Time Tracking, so you can run agents against it safely.

FAQ

Questions about duplicate_invoice

What does the duplicate_invoice tool do? +

duplicate_invoice. It is categorised as a Write tool in the Clockify Time Tracking MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on duplicate_invoice? +

Register the Clockify Time Tracking MCP server in PolicyLayer and add a rule for duplicate_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 Clockify Time Tracking. Nothing to install.

What risk level is duplicate_invoice? +

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

Can I rate-limit duplicate_invoice? +

Yes. Add a rate_limit block to the duplicate_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 duplicate_invoice completely? +

Set action: deny in the PolicyLayer policy for duplicate_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 duplicate_invoice? +

duplicate_invoice is provided by the Clockify Time Tracking MCP server (pypi:clockify-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.