Core answer
Start here. This is the direct spoken answer to practice first.
Overview
A production agent is a bounded workflow system with a probabilistic decision-maker, not an unrestrained model loop.
I begin with a measurable user goal and prove that flexible next-step selection outperforms a deterministic workflow. The application authenticates the user, constructs trusted context, exposes a small task-specific toolset, and runs the model inside explicit state transitions and budgets. Tools enforce authorization and validation, while final success is verified from application or external state.