Lesson 2: Put the right help articles in front of the model

Module 7 · Lesson 2 · About 55 minutes · Needs: Module 2 Lesson 2 (lost in the middle), Module 1 Lesson 4 (the Wilson interval), Module 6 Lesson 2 (the tool loop); the guard ask from course-guide/02

The situation

It is Monday 13 July 2026, week 7. Maya wants drafted replies that quote the help centre, not the model's memory. Ana Duarte's ticket T-1001 is the test case: she was charged 288 USD twice and wants the duplicate back. The answer, including "5 to 10 working days", is in one article, billing-refunds.

Joel's one-cent cap rules out pasting all twelve articles into every call. You need a retriever that picks a few, a way to measure it, and decisions on how many to send, in what order, and who fetches them.