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Systematic debugging methodology using evidence-based investigation to identify root causes. Use when encountering bugs, errors, unexpected behavior, failing tests, or intermittent issues. Enforces four-phase framework (root cause investigation, pattern analysis, hypothesis testing, implementation) with the iron law NO FIXES WITHOUT ROOT CAUSE FIRST. Covers runtime errors, logic bugs, integration failures, and performance issues. Useful when debugging, troubleshooting, investigating failures, or when --debug flag is mentioned.

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1Download skill
2Enable skills in Claude

Open claude.ai/settings/capabilities and find the "Skills" section

3Upload to Claude

Click "Upload skill" and select the downloaded ZIP file

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SKILL.md

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