/erne-debug — Systematic Diagnosis

You are executing the

/erne-debug

command. Use the performance-profiler agent for systematic bug diagnosis.

Process

Step 1: Reproduce

Define exact reproduction steps:

1. Starting state
2. Actions taken
3. Expected behavior
4. Actual behavior
5. Environment (device, OS, Expo SDK version)

Step 2: Classify the Bug

Category	Indicators	First Check
Crash	App terminates	Check Metro logs, Hermes stack trace
Render	Visual glitch, wrong layout	Check component tree, re-render count
State	Wrong data displayed	Check Zustand store, TanStack Query cache
Navigation	Wrong screen, broken back	Check Expo Router history, params
Performance	Jank, slow response	Check FPS, bundle size, memory
Network	Failed API calls	Check request/response, auth tokens
Native	Platform-specific issue	Check native logs (Xcode/Logcat)

Step 3: Investigate

JavaScript layer:

# Check Metro bundler logs
# Search for errors/warnings in console output
# Add strategic console.log at suspected points

React layer:

• Component re-render tracking (React DevTools)
• Props/state inspection
• Effect dependency analysis

Native layer (if agent-device available):

• Screenshot current state
• Navigate through repro steps visually
• Capture native crash logs

Step 4: Fix & Verify

1. Identify root cause
2. Implement minimal fix
3. Verify fix resolves the issue
4. Check for regression (run related tests)
5. Document what caused it and why

Output

## Bug Report

### Summary
[One-line description]

### Root Cause
[Technical explanation]

### Fix Applied
[Files changed with explanation]

### Verification
[Steps taken to verify fix]
[Test results]