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---
name: principle-fix-root-causes
description: 'Use for root-cause repair only on explicit request. Requires fixing causes instead of symptoms.'
disable-model-invocation: true
---
# Fix Root Causes
When debugging, do not fix symptoms. Trace every problem to its root cause and fix it there.
**Why:** Symptom fixes accumulate. Each workaround makes the system harder to reason about, and the real bug remains. Root-cause fixes are slower upfront but reduce total debugging time.
**Pattern:**
- Reproduce first
- Ask "why" until you hit the root cause
- Do not add guards (adding a nil check to silence a crash is a symptom fix)
- If a workaround needs a paragraph-long comment to justify it, the code is wrong (fix the code, not the comment)
- Check for the pattern, not just the instance (grep for the same pattern, fix all instances)
- When stuck, instrument. Don't guess (add logging, read the actual error)
**Restart bugs: suspect state before code**
When something "fails after restart," suspect stale persistent state first: config files, caches, lock files, serialized state. If clearing a state file restores behavior, prioritize state validation as the fix.
