/səˈraɪ/  ·  suh-RYE  ·  noun

A serai is the walled inn where caravans stopped for the night. Water, fodder, a gate shut at dark. The travellers slept; the caravan was safe without anyone staying awake to watch it. At dawn the gates opened and everyone went on.

The word is Persian — sarāy, a house — and it is the second half of caravanserai. The serai is not the caravan. It is the place that keeps the caravan.

Close your laptop.
Your agents keep working.

serai is a native macOS app that runs Claude Code and OpenCode in tmux on machines that don’t sleep — a Mac mini, a NUC, a server — and reaches you when one of them stops and needs a decision. Your agents are the travellers. The machine that never sleeps is the courtyard.