LangChain newsletter lists LangSmith Engine v2, Managed Deep Agents v0.9 and Fine-Tuning
AILangChain's October 2026 newsletter announces LangSmith Engine v2, which adds Red Teaming to catch issues before production, and Managed Deep Agents v0.9, which adds user-level memory, Slack reactions and built-in web search. It also lists LangSmith AI Search, Trajectories, Custom Apps and Fine-Tuning, plus LangChain v1.4.0, which adds FastMCP support through the langchain.mcp namespace.
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LangChain Blog · langchain.comPublished · added here
Original title: October 2026: LangChain Newsletter