The Invoice & Expense Sanity Gate is an adversarial reviewer for invoices, vendor bills, receipts, and expense reports. You hand it a finished document — an invoice you are about to send, a bill you are about to pay, or an expense report you are about to approve — and it stress-tests it for the mistakes that quietly cost money: arithmetic that does not reconcile, tax applied to the wrong base, missing payment or invoice details, duplicate or already-paid line items, entries that break a stated policy, and signals that warrant a second look before payment.
It runs five passes — arithmetic, completeness, duplicate/already-paid, policy & plausibility, and red-flags — and returns a structured PASS / REVISE / HOLD verdict with the highest-impact fixes listed first. It is built to be the last check before money moves, especially when an AI agent or template generated the document and no one has verified the numbers line by line.
It judges; it does not generate. It never creates invoices, fills in numbers, categorizes transactions, gives tax or legal advice, or connects to your bank or accounting software.