GKE Introduces Agent Sandbox For Isolation

Google's GKE introduces Agent Sandbox, a Kubernetes extension providing ephemeral, gVisor-backed, VM-like sandboxes for running untrusted or specialized agent code. The open-source CRD and controller (agents.x-k8s.io/v1alpha1) offer stable identity, persistent volumes, hibernation, SandboxTemplate/Claim/WarmPool abstractions, and Autopilot integration with gVisor enabled by default, reducing kernel escape risk and improving on-demand agent deployment latency.
Scoring Rationale
Official, actionable GKE feature with broad cluster impact + limited novelty beyond established gVisor sandboxing practices.
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