Platform
A laptop can run one agent while you watch it. Running a fleet takes isolation, an always-on runtime, and control.
An agent needs somewhere safe to execute. Every session gets its own ephemeral sandbox with nothing shared, so ten agents can work the same repo in parallel without touching a laptop or each other.
An agent that reacts the moment a PR opens cannot wait for someone to open a laptop. Scheduled, event-triggered, and mention agents all need a runtime that is always on.
Autonomous agents need control that does not depend on a human at the keyboard. Every session runs inside limits you set once and enforce everywhere.