October 2026 LangChain Newsletter: Everything we shipped at Interrupt NYC & London

LangChain announced multiple new features and updates at Interrupt NYC and London, including LangSmith AI Search, Managed Deep Agents v0.9, and LangSmith Engine v2 to enhance AI agent control and production reliability. They also released LangChain v1.4.0 with FastMCP support and introduced the Agentic Operating Model for scaling AI production.