Question
You're asking an AI agent to implement a Java function that splits an invoice total across N line items proportionally and applies a percentage tax, returning amounts to charge a customer's card. Write the spec that makes it monetarily correct and auditable. What numeric type, rounding mode, and invariants do you require, and what acceptance criteria prove it? Then describe what a naive prompt ('split the total and add tax') produces that fails an accountant's audit.
Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it — tests, edge cases, reading critically — and how you’d re-prompt or decompose to get it right.
Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.