AI Agent Memory and State Management — LangChain / LangGraph

AI Agent Memory and State Management — LangChain / LangGraph (as of 07 Jul 2026)

How to manage memory and persistent state in LangChain agents and LangGraph graphs — covering checkpointers, cross-thread stores, deprecated memory APIs, LangMem, retrieval-augmented memory, state schema design, and production pitfalls — accurate as of July 2026.