Use when a flow breaks and needs runtime evidence — button does nothing, wrong data after save, an endpoint returns the wrong result, a CLI command or job fails silently, a request dies between layers — or when the user will reproduce locally and wants temporary debug logs / a flow trace. Triggers on "add logs and I'll repro", "trace this flow", "why is this request wrong", "instrument this bug", or guessing from code alone without a repro trail.
