Shared agent workspaces fail in a fixed order, from stale reads to zombie writes
mrvladp · reddit · 2026-07-21
This long post lays out a failure ladder for shared agent workspaces: stale reads with multiple requesters, lost updates with concurrent writers, zombie writes after task reclamation, and the still-open problem of cross-host coordination.
It argues that versioning is the prerequisite for coordination, not a nice-to-have, and suggests different fixes for each rung:
- Stale read: invalidate peers when a newer version lands.
- Lost update: require the version read to be included in the write.
- Zombie write: add an ownership generation that changes when work is reclaimed, so a resumed stale process cannot silently commit.
The author also distinguishes storage rollback from undoing agent actions, saying rollback stops being a simple storage problem once the agent has already affected the world.
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