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Async agent training doubles rollout throughput, but held-out success falls. What do you inspect first?

Follow one rollout from its generating policy to the optimizer. Diagnose stale weights, broken comparison groups, missing rewards and completion-time bias before treating more samples as more learning.

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

Follow one rollout from its generating policy to the optimizer. Diagnose stale weights, broken comparison groups, missing rewards and completion-time bias before treating more samples as more learning.

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