create_invoice_draft · Mad Invoice MCP: Risk & Policy

WHAT IT DOES

What create_invoice_draft does on Mad Invoice

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

WHY IT NEEDS A POLICY

Why create_invoice_draft needs a policy

This tool creates new invoice records in JSON storage. While creation is reversible (drafts can be deleted via delete_invoice_draft), the financial nature of invoices and potential for misuse (generating false invoices, inflating amounts) elevates severity to medium. Classified as Write rather than Financial because it operates on drafts, not committed financial transactions.

From the tool's definition Tool name 'create_invoice_draft' combined with server description stating 'creation and management of invoices' and 'Supports draft creation' indicates this tool creates new invoice data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_invoice_draft Rate-limited

create_invoice_draft 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_draft": {
      "limits": [
        {
          "counter": "create_invoice_draft_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 Mad Invoice, so you can run agents against it safely.

FAQ

Questions about create_invoice_draft

What does the create_invoice_draft tool do? +

create_invoice_draft. It is categorised as a Write tool in the Mad Invoice 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_draft? +

Register the Mad Invoice MCP server in PolicyLayer and add a rule for create_invoice_draft: 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 Mad Invoice. Nothing to install.

What risk level is create_invoice_draft? +

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

Can I rate-limit create_invoice_draft? +

Yes. Add a rate_limit block to the create_invoice_draft 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_draft completely? +

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

create_invoice_draft is provided by the Mad Invoice MCP server (mad-sol-dev/mad-invoice-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.