Compares the runtime behavior of two or more versions of the same code by running them on identical inputs and diffing outputs, side effects, and errors. Use when validating a refactor, port, or optimization; when the user asks if two implementations behave the same; or when investigating a suspected regression across versions.
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If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.