Why You Must Freeze a Holdout Set Before Trusting Any Coding-Agent Score

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Coding-agent benchmarks can quietly become meaningless when teams repeatedly inspect failures, adjust system prompts, and rerun the same tasks — inflating pass rates without genuine improvement. A structured protocol addresses this by splitting a task suite into a tune set and a permanently frozen holdout set, with scores only published from the untouched holdout. Each task must meet strict validity rules: the unpatched repo must fail hidden tests, the oracle patch must pass them, and hidden tests must never be visible to the agent. The holdout split should be generated with a fixed random seed rather than human intuition, which tends to place harder tasks in the tune set and skew results. Even a small suite of twenty well-formed tasks is considered more reliable than hundreds of loosely defined demos, since a frozen denominator, meaningful metrics, and grader integrity checks are all required before a percentage qualifies as a real measurement.

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