code-debugginglisted

# Debugging Skills A collection of systematic debugging methodologies that ensure thorough investigation before attempting fixes. ## Available Sub-Skills ### Systematic Debugging **Location:** `systematic-debugging/SKILL.md` Four-phase debugging framework: Root Cause Investigation → Pattern Analysis → Hypothesis Testing → Implementation. The iron law: NO FIXES WITHOUT ROOT CAUSE INVESTIGATION FIRST. ### Root Cause Tracing **Location:** `root-cause-tracing/SKILL.md` Trace bugs backward through the call stack to find the original trigger. Don't fix symptoms - find where invalid data originated and fix at the source. ### Defense-in-Depth Validation **Location:** `defense-in-depth/SKILL.md` Validate at every layer data passes through to make bugs structurally impossible. Four layers: Entry Point → Business Logic → Environment Guards → Debug Instrumentation. ### Verification Before Completion **Location:** `verification-before-completion/SKILL.md` Run verification commands and confirm output before claiming success. The iron law: NO COMPLETION CLAIMS WITHOUT FRESH VERIFICATION EVIDENCE. ## When to Use - **Bug in production** → Start with systematic-debugging - **Error deep in stack trace** → Use root-cause-tracing - **Fixing a bug** → Apply defense-in-depth after finding root cause - **About to claim "done"** → Use verification-before-completion ## Quick Dispatch | Symptom | Sub-Skill | |---------|-----------| | Test failure, unexpected behavior | systematic-debuggin