Stripe webhook receiver spec
You need an agent to build a webhook receiver in Python (FastAPI) that ingests Stripe events: verify the signature, dedupe replayed events, process asynchronously, and return 200 fast. Instead of prompting iteratively, you want to write one spec good enough that it gets the security- and correctness-critical parts right on the first pass. Sketch the spec — what context, constraints, and acceptance criteria you include — and call out what a vague prompt ('build a Stripe webhook handler') would get wrong here.
handle_webhook_deliveries(delivery_lines: list[str], webhook_secret: str) → list[str][["whsec:22|evt_1;invoice.paid;100","whsec:22|evt_1;invoice.paid;100","whsec:99|evt_2;invoice.paid;100"],"whsec"]out["200_enqueued","200_duplicate","400_bad_signature"][["whsec:7|evt_1;x","whsec:7|evt_2;y"],"whsec"]out["200_enqueued","200_enqueued"]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 & agentic: describe the solution in plain language (or narrate it) and the coach grades your approach.