CHAPTER 7
The Money Rules
§3.6 Cost discipline — one gateway, quotas + a ceiling, cache, no standing spend
SEE IT
YOUAdd an “explain this in plain English” button — it calls the model on whatever the user is looking at.
THE AGENTStraightforward. I’ll wire the model call right into the button handler and the three other spots that could use it. Want me to build it now?
Every one of those call sites spends real money, on your account, with no meter and no cap. The moment before you say “go” is the only cheap place to put the guardrail. After it ships, the bill is already running.
DO IT
What do you tell it to build first?
Earn the rule to move on.