LangSmith Engine v2 adds red teaming and validated fixes

LangChain announced LangSmith Engine v2 at Interrupt. With the update, teams can spot agent issues and resolve them before users see them.

Engine v2 adds red teaming that identifies issues in an agent before they surface in production. It tests proposed fixes and confirms they work before showing them to users, and it surfaces inefficient agent work plus trends in cost and latency. LangChain linked the release to its LangSmith Engine v2 announcement.