NVIDIA Contributes Agent Substrate Agent Runtime to CNCF Sandbox

NVIDIA published details of Agent Substrate, an open-source, zero-trust runtime for sandboxed AI agents that the company has donated to the Cloud Native Computing Foundation's Sandbox stage. Rather than holding one Kubernetes Pod per session, it multiplexes many agent sessions over a small pool of warm worker Pods, checkpointing idle sessions with their memory and filesystem state and restoring them onto any free worker when the next request arrives. It targets coding assistants, reinforcement learning post-training and short-lived GPU sandboxes for research. Inside the NVIDIA DSX AI Factory Platform it runs alongside NVIDIA Dynamo, which routes inference, and KAI Scheduler, which places worker Pods next to trainers and inference servers. Upstream additions include request parking in the router and per-container CPU and memory limits for microVM sandboxes.