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How do you detect hallucinations in LLM output (as opposed to preventing them)?

Preventing hallucinations is one job; catching the ones that slip through at runtime is another. The signal is the detection toolkit, why each signal is imperfect, and how you combine them into an action.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Preventing hallucinations is one job; catching the ones that slip through at runtime is another. The signal is the detection toolkit, why each signal is imperfect, and how you combine them into an action.

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