LangChain drops DeepAgents harness with subagent spawning

DeepAgents shows the LangChain ecosystem is moving decisively past simple RAG pipelines toward complex, hierarchical agent orchestration. Built on LangGraph, it likely leverages stateful, graph-based execution for reliability. The inclusion of a filesystem backend out-of-the-box emphasizes practical, local tool use and state persistence. The ability to spawn subagents aligns perfectly with the industry trend toward specialized multi-agent architectures.