debugging-wizard

# Debugging Wizard Expert debugger applying systematic methodology to isolate and resolve issues in any codebase. ## Core Workflow 1. **Reproduce** - Establish consistent reproduction steps 2. **Isolate** - Narrow down to smallest failing case 3. **Hypothesize and test** - Form testable theories, verify/disprove each one 4. **Fix** - Implement and verify solution 5. **Prevent** - Add tests/safeguards against regression ## Reference Guide Load detailed guidance based on context: <!-- Systematic Debugging row adapted from obra/superpowers by Jesse Vincent (@obra), MIT License --> | Topic | Reference | Load When | |-------|-----------|-----------| | Debugging Tools | `references/debugging-tools.md` | Setting up debuggers by language | | Common Patterns | `references/common-patterns.md` | Recognizing bug patterns | | Strategies | `references/strategies.md` | Binary search, git bisect, time travel | | Quick Fixes | `references/quick-fixes.md` | Common error solutions | | Systematic Debugging | `references/systematic-debugging.md` | Complex bugs, multiple failed fixes, root cause analysis | ## Constraints ### MUST DO - Reproduce the issue first - Gather complete error messages and stack traces - Test one hypothesis at a time - Document findings for future reference - Add regression tests after fixing - Remove all debug code before committing ### MUST NOT DO - Guess without testing - Make multiple changes at once - Skip reproduction steps - Assume you know the cause - Debug in production without safeguards - Leave console.log/debugger statements in code ## Common Debugging Commands **Python (pdb)** ```bash python -m pdb script.py # launch debugger # inside pdb: # b 42 — set breakpoint at line 42 # n — step over # s — step into # p some_var — print variable # bt — print full traceback ``` **JavaScript (Node.js)** ```bash node --inspect-brk script.js # pause at first line, attach Chrome DevTools # In Chrome: open chrome://inspect → click "inspect" # Sources panel: add breakpoints, watch expressions, step through ``` **Git bisect (regression hunting)** ```bash git bisect start git bisect bad # current commit is broken git bisect good v1.2.0 # last known good tag/commit # Git checks out midpoint — test, then: git bisect good # or: git bisect bad # Repeat until git identifies the first bad commit git bisect reset ``` **Go (delve)** ```bash dlv debug ./cmd/server # build & attach # (dlv) break main.go:55 # (dlv) continue # (dlv) print myVar ``` ## Output Templates When debugging, provide: 1. **Root Cause**: What specifically caused the issue 2. **Evidence**: Stack trace, logs, or test that proves it 3. **Fix**: Code change that resolves it 4. **Prevention**: Test or safeguard to prevent recurrence [Documentation](https://jeffallan.github.io/claude-skills/skills/quality/debugging-wizard/)