Lesson 8 · 12 min
A capstone — running the playbook on a real feature
The capstone. Walk through applying all five habits to a real feature, with the cost reduction you'd expect at each step.
The starting point
Feature: 'AI ticket summary' for a B2B support tool. Current setup:
- Every call hits Claude Sonnet 4.6.
- Prompt is rebuilt per request from a template (no caching).
- No metadata; no per-feature visibility.
- 3M calls/month, average 1,200 input + 250 output tokens.
- Current bill: ~$3,600/month for this one feature.
CFO is asking why support tooling costs more than the product team's seat licenses.