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Your agent's weekly pass rate fell from 92% to 88%, and nobody changed the agent, the prompt or the model. How do you find out why?

Four points gone with no deploy. It might be the agent failing on new inputs, the judge that scores it, or simply a different mix of requests. One of those is not a quality problem at all. Which checks separate them, and in what order?

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

Four points gone with no deploy. It might be the agent failing on new inputs, the judge that scores it, or simply a different mix of requests. One of those is not a quality problem at all. Which checks separate them, and in what order?

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