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Structured approach to finding and fixing bugs
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| name | systematic-debugging |
| description | Structured approach to finding and fixing bugs |
| version | 1.0.0 |
| author | Ariff |
| when_to_use | When debugging - follow systematic process instead of guessing |
REPRODUCE → ISOLATE → TRACE → FIX → VERIFY
Never skip steps. Never guess.
Goal: See the bug happen reliably
1. Get exact reproduction steps
2. Run them yourself
3. See the exact error
4. Document: input, output, expected
Red flags:
Goal: Find minimum case that shows bug
1. Start removing things
2. Does bug still happen?
3. Keep removing until minimal
4. Result: smallest repro case
Why this matters:
Goal: Find root cause (use root-cause-tracing skill)
1. Start at symptom
2. Trace backward: where does bad value come from?
3. Keep asking "where did THIS come from?"
4. Stop when you find origin
Tools:
Goal: Change code at root cause
1. Write failing test first
2. Make minimal change to fix
3. Verify test passes
4. Check for side effects
Anti-patterns:
Goal: Confirm fix works and nothing broke
1. Run original reproduction
2. Bug should be gone
3. Run full test suite
4. No regressions
Must have:
| Type | Debug Strategy |
|---|---|
| Null/undefined | Trace where value should've been set |
| Wrong value | Log at each transformation step |
| Race condition | Add logging with timestamps |
| State corruption | Find all state modifiers |
| Off-by-one | Check loop bounds and indices |
| Missing case | Check all switch/if branches |
When adding debug logs:
// Include: location, variable name, value, timestamp
console.log('[user.ts:45]', 'userId:', userId, Date.now());
Clean up logs before committing.
When you don't know what broke it:
1. Find last known working version
2. Find first broken version
3. Binary search between them
4. Each step: does bug exist?
5. Result: exact commit that broke it
root-cause-tracing → For step 3 (Trace)defense-in-depth → For step 5 (Verify)verification-before-completion → Before claiming fixedassumption-checker → What assumptions about the code?fact-checker → Verify claims about behaviorpre-action-verifier → Before applying fix