Question
You need a date-range picker utility in TypeScript that, given a start and end date plus a user timezone, returns the inclusive list of calendar days and validates the range. You'll have an AI agent build the date math (not the UI). Write the prompt/spec — constraints, edge cases, acceptance criteria — for a first-try-correct result. What does a vague prompt ("give me the days between two dates") get wrong with dates specifically?
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.