Kubernetes won the container decade. Google’s Agent Substrate wants the next one.
The New Stack 21 hours ago
Google released GKE Agent Sandbox to general availability in May 2026 and introduced Agent Substrate, a separate scheduler designed for AI agents because Kubernetes was built for long-running services rather than the bursty, mostly-idle workloads that agents represent. Agent Substrate achieves 30x or more oversubscription with sub-second activation by snapshotting idle sessions to storage and multiplexing them onto pre-warmed worker pods, while Agent Sandbox provides kernel isolation via gVisor for running untrusted model-generated code at 300 sandboxes per second with 90 percent finishing in 200 milliseconds. The emergence of this dedicated agent runtime as a fourth compute offering alongside virtual machines, containers, and serverless indicates that the infrastructure layer for managing agents is consolidating into specialized systems separate from general container orchestration.
