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Your agent fails 5% of the time mid-workflow, after executing real side effects. Make it safe.

The question that separates demo-builders from production engineers. Idempotency keys, the saga pattern, dry-run modes, approval tiers: the distributed-systems toolkit applied to agents, with the trap most answers miss.

Updated Sep 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

The question that separates demo-builders from production engineers. Idempotency keys, the saga pattern, dry-run modes, approval tiers: the distributed-systems toolkit applied to agents, with the trap most answers miss.

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