Observability Setup — Which Backend + One-Line Autolog "Instrument before you need it. The cheapest debugging session is a trace you already have." This is an ENHANCE overlay . The local skills [[langsmith]], [[phoenix]] and [[mlflow]] each teach one backend deeply. This skill sits one level up: it answers the question those skills cannot — which one, and how do I turn it on in a single line right now — then hands off to the chosen backend's own skill for depth. --- 1. 何时激活 (When to activate) Activate at one of three moments — earlier is always cheaper: | Trigger | Signal | |---|---| | Starti…