查找技能

Audit whether tests detect broken behavior by tracing assertions and running narrow controlled mutations in an isolated workspace; use for test-quality reviews, not routine test execution.

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Diagnose an uncertain bug by designing experiments that distinguish competing causes, especially speculative cache, timing, environment, or concurrency explanations.

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Review a planned deployment or release diff for rollback feasibility, mixed-version compatibility, migrations, and configuration readiness without deploying it.

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Test a changed user interaction for realistic sequence failures such as double submission, stale responses, navigation, and recovery; use for interaction QA rather than general code review.

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Trace the purpose of suspicious legacy code using current callers, tests, and Git history when deciding whether it can be changed or removed.

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Keep a small requested change focused when optional refactors, architectural redesign, or unrelated cleanup threaten to expand its scope.

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Review proposed abstractions, dependencies, and configuration for concrete consumers and maintenance cost when simplifying a design or checking overengineering.

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Verify that a requested bug fix changes observable behavior with a failing-before, passing-after reproduction and honest execution evidence.

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