Designing the Runtime Layer for Stateful AI Agents: Where Agent Substrate Fits
Introduction: The Layer Nobody Designs AI agents are evolving from simple prompt-response systems into stateful, long-running applications that can reason, execute tasks, and interact with external systems. Yet, most agent architectures are driven by models, tools, memory, and orchestration — not runtime infrastructure that can run agents reliably. Unlike traditional applications, stateful AI agents need execution context to run (and recover from failures), concurrent tasks, and the ability to r

