Pi Durable

Pi Durable is Earendil’s experimental agent harness, shipped alongside Pi 1.0. TannerMidd/pi-pocket is a mobile-first, multiplayer web app for Pi built on it.

• Every model call and tool call is a task that checkpoints to storage (SQLite, JSONL, or memory) before moving on. Kill the process and a new one opens the same file and resumes.
• Recovery is per step: a cut-off model request is resent with the partial answer kept and marked aborted. A cut-off tool call reruns only if it is replay-safe; otherwise the model is told it was interrupted.
• A requestId makes a submission exactly-once, so a client retrying after a crash gets the original back.
• Forks see the parent transcript up to the fork point without copying it.
• ~15k lines total, small enough for an agent to read end to end.
• pi-pocket: restart the server mid-run and the work continues. Several people can watch, steer, or queue messages on the same session.
• npm start -- --access tailscale binds only to the tailnet address, so my phone gets it with no tunnel.
• The shift: the session lives in a SQLite file, not a terminal process, so the phone is just another client. Could replace my Moshi + tmux setup.
• Caveat: anyone who can steer runs shell commands as you.