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Alex Vanderveen
651acb42e5
The segment-level run came back with 10,619 checked and 74,111 skipped, and the weak-coverage guard correctly refused to call it a result. But "74,111" on its own does not distinguish the two situations that produce it, and they call for opposite responses: something is wrong, or this mode structurally cannot cover this game. Here it is the second. 99% of the skips are segments containing an interrupt, which cannot be replayed — so in an interrupt-heavy game segment granularity skips almost everything by construction. The tool now names the dominant reason when one accounts for 60% or more, explains it, and in this case says outright to use block granularity instead. That is not hypothetical: the block-level run over the same game covered 5,679,898 blocks with ZERO skips. Same instrument, same question, and the two modes differ by four orders of magnitude in what they actually compared. No single reason above 60% names no cause at all, since inventing one would be worse than staying quiet. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>