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PointSav Digital Systems

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Multi-engine session coordination — session locks, boot_id, and role guards

Totebox Orchestration supports multiple AI engines and human operators working concurrently on the same host. The coordination problem is not theoretical — when two sessions touch the same .git/index, the working tree corrupts in ways that are expensive to diagnose.

The protocol is intentionally minimal: each engine writes .agent/engines/<engine-id>/session.lock at startup. The lock carries the engine identifier, session role, parent PID, ISO-8601 start time, and the boot ID from /proc/sys/kernel/random/boot_id. The boot ID is the key — it lets a future session decide whether a lock is stale (a different boot ID means the host rebooted between sessions, making the lock definitively dead) or potentially live (same boot ID, check kill -0 <pid> for process liveness).

The totebox-session model assigns exactly one hub session to the workspace root. That session writes role.lock at .agent/role.lock; a second attempt errors out unless the operator manually clears the lock. Archive sessions are scoped to individual archives and write their locks under that archive's .agent/engines/<engine-id>/session.lock.

What this does not solve: two engines opened in the same archive. The session-lock protocol detects the conflict and warns, but does not physically prevent it — flock on .git/index does that. A planned PreToolUse hook adds a check that refuses any write call in an archive whose session.lock shows a different live engine. The workspace health-check tool includes a cross-user index.lock detector that surfaces same-archive locks held by different operators.

Stale-lock cleanup is automatic when boot IDs disagree, manual otherwise. A cleanup pass on 2026-05-18 removed 8 such locks — 3 from a previous boot, 5 from dead PIDs in the current boot. Hub sessions should run the health-check tool early and clear stale locks before opening any archive.

See also

Important Information

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