What if an AI could build an entire app without ever forgetting your instructions? Anthropic's new Claude SDK tackles AI agent amnesia for complex, long-running tasks. Instead of one forgetful agent, it uses a two-part system inspired by human developers to bridge the gap between sessions. An initializer agent sets up the project, while a coding agent makes incremental progress, leaving structured notes and even running tests so the next session can pick up flawlessly. This breakthrough paves the way for truly autonomous agents that can reliably handle multi-stage projects without constant human intervention. Practical uses range from building production-quality web apps from a single prompt to executing complex scientific research or financial modeling.