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PointSav Digital Systems

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Multi-Engine Session Coordination — Session Locks, boot_id, and Role Guards

The development workspace supports two AI engines (Claude Code and Gemini CLI) and two human operators on the same Linux box. 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, role (Command or Totebox), 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 VM 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 Command Session to the workspace root. That Command Session writes role.lock at .agent/role.lock; a second attempt errors out unless the operator manually clears the lock. Totebox Sessions are scoped to individual archives and write their locks under clones/<archive>/.agent/engines/<engine-id>/session.lock.

What this does not solve: two engines opened in the same clone. 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 Bash or Write tool call in a clone whose session.lock shows a different live engine. bin/foundry-health.sh includes a cross-user index.lock detector that surfaces same-repo locks held by different UIDs.

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. Command Sessions should run foundry-health.sh early and clear stale locks before opening any archive.

See also

Important Information

Important Information

Corporate structure. PointSav Digital Systems ("PointSav") is a trade name of Woodfine Capital Projects Inc. ("Woodfine"). PointSav does not itself offer, sell, or solicit any security. Any securities offering associated with Woodfine's real-property direct-hold solutions is made exclusively by Woodfine, and only by means of the applicable Private Placement Memorandum.

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