What should your AI product do?
Decide what the model should do, and what good looks like, before you build.
Put the behavior in a contract, then build the system prompt that enforces it.
Pick the model as a product decision, then decide how it gets facts it was not trained on.
Build a real version yourself in a day, and let it find the cases your spec missed.
Can you prove your AI product does it well?
Decide what the model may never do on its own, and enforce it.
Measure that it works, because you cannot catch quiet failures by eye.
Design the uncertain moments instead of hiding them.
A good response is relevant, consistent, appropriate, affordable, and fast. You cannot maximize all five.
Does your AI product still do it well?
Measure what matters once real people are using it, and read real sessions.
The model moves under you, so watch for slow decay.
Turn every failure you catch into the next turn's work.
Then you run the cycle again.
The umbrella across every turn of the cycle.
A retrieval system is only as good as what it is allowed to read.
Tell the system what each person is allowed to see.
Once a product acts on its own, every weakness compounds.