Answer questions about live production system behavior — current variable values, execution durations, hit counts, and value distributions — by instrumenting running services with Lightrun MCP tools. Use when the question requires live runtime data rather than static code analysis (e.g. "show recent requests to this endpoint", "show the runtime distribution for this operation", "what values appear for this expression in production?", "which branch runs for customer X?"). Do not use for incident diagnosis, pull-request review, code changes, setup, or deployment. Route latency, timeout, deadline, SLO, or hang diagnosis to lightrun-slow-execution-diagnosis when available; route other diagnosis, or fallback when that skill is unavailable, to lightrun-live-runtime-debugging when available. If neither diagnosis skill is available, report the scope gap.