The fleet does not run on a model's general memory of eCommerce. It runs on three separate layers, and understanding the split is the whole point.
Rules — margin floors, refund ceilings, SLA windows, marketplace policy — live in code, in the action handler. A model cannot be persuaded past them because it is not the thing enforcing them.
Knowledge — the catalogue, the client's own policies, historical tickets, precedent — lives in a retrieval index scoped to your workspace alone. Agents answer from indexed documents belonging to your accounts, not from anything the model happens to recall.
Judgement — anything ambiguous, novel, or touching money, health claims or legal exposure — goes to your reviewer. Always, by design, not as a fallback.