google-secure-1psidts-cookie-rotates-days-to-weeks
__Secure-1PSIDTS is the shortest-lived Google session cookie (days to weeks), and is the primary auth expiry trigger for NotebookLM MCP. Core session cookies (SID/HSID) last ~2 years and SIDCC ~1 year. Regular active usage slows rotation (Google keeps active sessions alive); inactivity accelerates invalidation. Mitigation: daily nlm notebook list health check cron with Alertmanager notification on failure, so manual cookie refresh via DevTools Network tab is triggered proactively rather than discovered from downstream failures.