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Software Development / AGENT SKILL

principle-fix-root-causes

cursor/plugins
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Reproduce bugs, trace their underlying causes, and fix the source of each failure.
Apply when debugging. Trace each symptom to its root cause and fix it there; reproduce first, ask why until you reach it, resist nil-check guards that silence crashes.

BEFORE YOU INSTALL

Understand the trade-offs.

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The full skill.

Original instructions from the publisher’s SKILL.md

# 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.

Skill folder

Files included alongside SKILL.md in the publisher’s repository.