That's what I am talking about as well. The low-level implementation of an agent isn't necessarily a rigid graph, and I'd actually argue its explicitly not this.
Not sure about Cursor you mentioned as its agent is not open sourced.
The whole workflow and the Runner class is for one agent.
Check out this line: https://github.com/openai/openai-agents-python/blob/48ff99bb...
A single `run_agent` is implemented based on the Runner class and workflow. So usually the workflow is for one agent (unless there is handoff).
> An agent is an AI model configured with instructions, tools, guardrails, handoffs and more.
Agents can hand off to other agents, but even the hand-off is decided by the agent itself, not a pre-defined orchestration.