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An AI assistant just produced code that's subtly wrong. Walk me through how you diagnose why, when the model is a black box.

You can't read the model's weights, so you debug the inputs you control. There's a four-bucket triage, prompt, context, model, or spec, that localizes the fault fast, and the real deliverable is feeding each diagnosis back so the same failure can't recur.

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

You can't read the model's weights, so you debug the inputs you control. There's a four-bucket triage, prompt, context, model, or spec, that localizes the fault fast, and the real deliverable is feeding each diagnosis back so the same failure can't recur.

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