Agent-as-Tool
A pattern where one agent exposes a specialist agent as a callable tool instead of handing over the whole conversation.
Plain English
The main agent can ask a specialist for one job and keep ownership of the final answer.
Example
A travel planner calls a visa-checking agent as a tool, receives the result, and continues planning the trip.
Why it matters
It offers specialization without losing the thread of who owns the user-facing response.