Lesson 1: Seven proven patterns, one support desk

Module 14 · Lesson 1 · About 50 minutes · Needs: Module 6 Lesson 1 (structured output), Module 7 Lesson 2 (retrieval), Module 10 Lesson 3 (human review); the rest helps

The situation

It is Monday 31 August 2026, week 14. Drafted replies for billing and sign-in tickets are live behind a feature flag, and word has spread. Joel wants every refund ticket as a row his team can sort. Maya wants handover notes on long threads. Lena wants to ask the internal runbook questions. Tomasz wants a parser for invoice ids.

Each request is a pattern: a shape of LLM application that teams have run in production long enough to know where it breaks. You already own most of the parts. This lesson traces one ticket, T-1001 (Ana Duarte, a 288 USD duplicate charge), through seven of them.