What is session persistence?
Session persistence saves the cookie jar and storage state produced by a successful sign-in, encrypted and keyed to a host and an account label, and restores it on later runs for that account. A run that restored one reports it, and a run can force a fresh sign-in instead when a stored session has gone stale.
Why it matters
Signing in is the slowest, most fragile and most detectable part of most workflows. Doing it once and reusing the session is both cheaper and safer — repeated logins from one identity are exactly the pattern bot detection is looking for.