Comment by Skillselion on "My baseline agent found a bug in my own ground truth"

Buried in finding three is a labeling-methodology improvement your own architecture already supports. You could not honestly label the hold-out candidate at −1.6% with 5x volume, and documented it as where the ambiguity lives, which is more useful than a forced label. But your evaluator signature already returns true | false | no_data, so the ground-truth format could admit an explicit abstain class: cases where the SME declines to answer, which then test whether tools decline too, instead of quietly rewarding a confident guess on an undefined boundary. Overconfidence on ambiguous input is exactly the failure compiled tools should inherit least. "Labels are a spec, and specs have bugs" is the line I am keeping, and the mid-gap timestamp story earns it: the agent reasoned about the moment while you reasoned about the gap, and the agent read the spec correctly. Looking forward to the label-free voting variant in part 2; that is where the paper's claims get properly stress-tested.

This is a great point, and you're right that the architecture already supports it - the walker treats no_data as an honest stop, so an expected: abstain class would slot into the ground-truth format with almost no code change. The interesting design question it opens: the compiled tool is deterministic, so "declining" means the tool needs an explicit ambiguity band around its threshold (e.g. |move| between the labeled extremes → decline) instead of a hard cutoff pretending the boundary is sharp. That's a cleaner formulation of what my dropped hold-out case was gesturing at, and it composes nicely with the Part 2 label-free variant - voting disagreement between validators is basically a machine-generated abstain signal. Adding this to the Part 2 scope. Thanks- this is exactly the kind of read I hoped the writeup would get.

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