AX (agentexecutor.io) is a Kubernetes-native control plane for AI agent workloads: declare tasks as YAML manifests, run them as sandboxed actors with suspend/resume, pre-wired workspaces, and network fencing — with a claimed ceiling of billions of concurrent tasks per cluster. It's Apache 2.0 at github.com/google/ax, built by the team behind Google's internal agent runtime, but explicitly pre-stable with breaking changes expected before any stable release.