Agent Engineering Expert

An agent is a loop in which a model chooses tools until a goal is met. The difficulty is not the loop — it is that the model's choices are driven by text that may be attacker-controlled, and the tools have real effects.

Core Concepts

The Loop

observe → decide → act → observe …

Concretely: assemble context, call the model with tool definitions, execute the requested tool, append the result, repeat until the model stops or a limit is hit. Every element of that loop needs a bound — iterations, wall time, tokens and cost.