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There is a step in the development process for large language model (LLM)-assisted tooling that most teams skip because it's tedious, time-consuming, and doesn't produce results visible to end users: Verifying that what the model is saying is actually correct. Not fluent, not coherent, not topically relevant — correct in the sense of accurately identifying the right answer to the specific problem the tool was built to solve. The gap between "this output sounds right to me" and "this output is verifiably correct" is where most LLM-assisted enterprise tools fail quietly. They pass internal review because the output sounds right. They fail in production because those people weren't reviewing against ground truth — they were reviewing against their intuition about what a good answer looks like. This distinction matters more as LLM-assisted tools move from productivity accessories to components that influence real business decisions. If your AI-assisted tool is shaping how an analyst investigates a data quality issue, how a compliance reviewer decides whether to escalate a flagged record, or how an operations team triages a validation failure — the accuracy of its output has real consequences. "Seems reasonable" is not an adequate evaluation standard for that. What qualitative evaluation actually catches The standard evaluation approach for LLM output in enterprise tooling is qualitative: A sample of outputs is reviewed by someone with domain knowledge, judged against a mental model of what a good answer looks like, and the prompt is adjusted if too many outputs seem off. This catches a specific class of problems: Outputs that are obviously wrong, poorly formatted, or off-topic. These are real issues worth catching. They're also the easy ones. What qualitative evaluation consistently misses is the class of outputs that are wrong in ways that are difficult to see without checking against something external. An explanation that confidently identifies the wrong root cause, in language that sounds authoritative, based on reasoning that sounds plausible — this passes qualitative review. It fails the moment someone with the right context checks it against what actually happened. In a system whose value proposition depends on accuracy, "sounds plausible" is not the same as "correct." The two can diverge significantly, and qualitative review won't tell you when they have. What an actual eval harness looks like The alternative is building an evaluation harness that scores model output against labeled ground truth — a set of cases where the correct answer is known, against which you can measure accuracy rather than coherence. I built this while developing a root-cause explainer for data migration drift: A tool that takes a detected drift event and generates a ranked explanation of what most likely caused it. The first prototype produced fluent, specific-sounding explanations that passed qualitative review. When I tested it against cases where I already knew th…
