Produce a North Star Metric Pack in Markdown (in-chat; or as files if the user requests):
1) North Star Narrative (value model, tie-breaker, scope) 2) Candidate metrics (3–5) + selection rationale (evaluation table) 3) Chosen North Star Metric spec (definition, formula, window, segmentation, owner, data source) 4) Driver tree (leading input/proxy metrics + guardrails)
5) Validation & rollout plan (instrumentation checks, dashboard cadence, decision rules) 6) Risks / Open questions / Next steps (always included)
Definisci o aggiorna la metrica North Star del prodotto + l'albero dei driver e produci un pacchetto metrico North Star condivisibile (narrativa, specifiche metriche, input, guardrail, implementazione). Fonte: liqiongyu/lenny_skills_plus.