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A/B test a conversational agent when 'success' is fuzzy, resolution, CSAT, deflection without anger

Standard A/B machinery assumes a crisp conversion event; agents give you fuzzy, delayed, gameable outcomes. The metric hierarchy, the reopen-window trick, and the sample-size reality check that win this question.

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

Standard A/B machinery assumes a crisp conversion event; agents give you fuzzy, delayed, gameable outcomes. The metric hierarchy, the reopen-window trick, and the sample-size reality check that win this question.

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