Systematic root-cause debugging: 8 phases — history search / reproduce / scope lock / pattern match / hypothesis test / fix / verify / report. Iron Law: no fix without a root cause. Trigger: investigate / debug / 调查 / 排查 / 为什么挂了 / 这个bug / 根因分析 / 错误报错 / 500 / stack trace / 昨天还好的. Skip: general code review (/review) / verification (/verify) / planned refactor (/implement).
$npx -y skills add abysscn/oh-my-dag --skill investigateInstalls into the current project.
Run `npx skills use "https://github.com/abysscn/oh-my-dag" --skill "abysscn/oh-my-dag/investigate"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/abysscn/oh-my-dag" that are relevant to the current task. Run `npx skills add "https://github.com/abysscn/oh-my-dag"` and select the relevant skills, then follow their instructions.