google-session-cookies-require-periodic-refresh-cron
Google session cookies have variable lifetimes: SID/HSID ~2 years, SIDCC ~1 year, __Secure-1PSIDTS rotates within days-weeks. The upstream client does not persist refreshed cookies back to disk during normal usage. A daily health check cron that runs nlm notebook list and fires an Alertmanager alert on failure is the minimum viable self-healing mechanism — this catches cookie expiry before it causes silent failures in production MCP calls.