In a production system where agents operate over long time horizons (minutes to hours), how would you manage state persistence and recovery?

How does the model actually "call" a tool? Explain the back-and-forth between the Assistant message and the Tool/Function message in an API loop.

How does the "Extraction, Transformation, and Loading" process differ when preparing data for a Vector Database versus a traditional SQL database?

How do you evaluate an agent when the "correct path" might involve 5 different tool calls in any order?