LangSmith When to use this skill - The user already chose LangSmith and needs the smallest useful packet for tracing, evals, review, prompt ownership, or trace propagation. - A request mentions LangChain tracing , / , / , annotation queues , run trees , trace IDs , datasets , or experiment comparison . - The team needs to decide whether a change needs debugging traces , an offline eval gate , an online review queue , Prompt Hub / prompt-registry work, or multi-service lineage . - The user has some LangSmith setup already, but confidence is still low and they need an audit / gap review . Do no…