Context: Why Long-Horizon Agent Memory is Hard When evaluating ByteDance's deer-flow for our multi-hour autonomous research pipeline, the core challenge wasn't task orchestration—it was semantic memory persistence under high concurrency . Agents running 90+ minute sessions need to recall prior decisions, avoid redundant API calls, and maintain coherent context across sandbox restarts. Most agent frameworks treat memory as an afterthought. deer-flow takes it seriously with a pluggable m...