Finds root cause before applying fixes for errors, crashes, regressions, failing tests, broken behavior, and screenshot-reported defects. Use when users ask 排查/报错/崩溃/不工作/回归/判断为什么报错, or say something used to work and now fails. Not for code review or new features.
This skill does not declare a tool allowlist. The agent host applies whatever default tools are available at runtime.
Registry
github (via claudemarketplaces.com)