Turn

One user message plus everything the agent does in response, up until it yields back to the user. Contains one or more model provider requests — many, if the agent calls tools. A clarifying question closes the turn; your reply opens the next one. The hierarchy is session > Turn > Model provider request.

Usage:

"One turn took two minutes?"

"It made fourteen tool calls inside that turn — each one is a separate model provider request. Latency stacks up before the agent finally yields back to you."