OpenShell compares to Agent Substrate and Kubernetes Agent Sandbox

OpenShell, Agent Substrate, and Kubernetes Agent Sandbox are three open-source runtimes that manage and isolate AI agents differently, utilizing distinct boundaries, policies, and storage mechanisms. OpenShell focuses on kernel-level controls and declarative YAML policies for process, file, and network security across multiple runtimes, while Agent Substrate and Agent Sandbox both operate on Kubernetes but handle actor state and persistence differently. The author provides a comparison of their units managed, isolation mechanisms, policy models, and quickstart workflows to help developers choose the right tool. Open article →