Your Coding Agent Will Never Start From Scratch Again: Session Storage in AgentCore Runtime

Picture this: your coding agent spent the last 40 minutes scaffolding a Node.js project. It installed dependencies, wrote the models, configured the ORM, left unit tests half-finished. You have to close the session. The next day you pick it back up — and the agent starts from scratch. No files. No node_modules . No trace of what it built. That's not a bug in your agent. It's the by-design behavior of any agent runtime without persistence. Every session boots from a clean filesystem. And there's an important distinction worth making before diving into the code: Episodic memory (which we covered in the previous article ) stores what the agent learned : patterns, reflections, past experiences. Session Storage stores what the agent built : files, dependencies, artifacts, operational project state. These are two complementary forms of persistence, not interchangeable ones. A serious production agent needs both. Today we focus on the second. The Problem with Ephemeral Agents The AgentCore ru