Cloud Run runs your container; the Agent Runtime runs your agent.
Session state and tool-calling as managed primitives, not something you build.
Renamed, April 2026
Vertex AI Agent Builder → Gemini Enterprise Agent Platform. "Agent Engine" is now "Deployments" internally.
Exam term
The ACE guide itself still says Agent Runtime — use that term
Multi-turn conversational session state and tool-calling tracking come built in — a plain Cloud Run deployment would require you to build both yourself on a database and orchestration code.