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• Why skill evals matter — April 28, 2026 · Andy Solomon
  Skills ship as markdown plus optional scripts and resist every form of change-detection we've built for code. Evals. and the with/without skill delta in particular. are the repeatable evidence about how a skill behaves before and after a change.

About the author

Andy Solomon (@andysolomon) builds developer tooling and writes about evals, skills, and agent tooling. arc-skill-eval is the runner; Skeval is the docs and blog.