One slide: when to use Agent Sandbox vs Agent Substrate for agent infrastructure

davemccollough · x · 2026-11-10

A conference slide laying out the choice between two open-source agent runtimes. Agent Sandbox (kubernetes-sigs/agent-sandbox) fits one sandbox per task/user: warm pool for fast start, suspend keeps storage, Kubernetes-native API (CRDs) on the cluster's control plane. Agent Substrate targets very many mostly idle agents: actors multiplexed on warm workers, resume with memory intact in milliseconds, its own control plane (API server + PostgreSQL) beside Kubernetes. Both provide VM-grade isolation on AKS and are open source.

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