Audit And Fix

Security Audit and Fix: $ARGUMENTS

I'll perform a comprehensive security audit and automatically fix vulnerabilities for: $ARGUMENTS

This advanced workflow includes:

1. Creating an isolated git worktree for safety
2. Running npm audit to identify all vulnerabilities
3. Categorizing vulnerabilities by severity (critical, high, moderate, low)
4. Automatically updating vulnerable packages
5. Using parallel agents for efficient processing (when >3 packages)
6. Validating each update with full test suite
7. Generating comprehensive security report
8. Prompting for merge if all validations pass

This is a complex skill demonstrating parallel execution, conditional logic, and comprehensive error handling.

Let's begin!

Process Steps

1. Create Isolated Git Worktree

Create an isolated environment for safe dependency updates:

# Generate unique timestamp
TIMESTAMP=$(date +%Y%m%d-%H%M%S)
WORKTREE_PATH="../audit-fix-worktree-$TIMESTAMP"
BRANCH_NAME="security-audit-$TIMESTAMP"

echo "🔒 Creating isolated worktree for security audit"
echo "📁 Worktree path: $WORKTREE_PATH"
echo "🌿 Branch name: $BRANCH_NAME"
echo ""

# Create worktree
git worktree add "$WORKTREE_PATH" -b "$BRANCH_NAME"

# Navigate into worktree
cd "$WORKTREE_PATH/expense-tracker-ai"

echo "✅ Worktree created and ready"
echo "📍 Working in: $(pwd)"
echo ""

Why isolated worktree is critical:

• Package updates can break the application
• Dependencies may have incompatibilities
• Tests may fail after updates
• Need ability to discard if updates fail
• Main workspace remains functional during audit

2. Run Initial Security Audit

Scan for vulnerabilities using npm audit:

echo "🔍 Running security audit..."
echo ""

# Run npm audit and save results
npm audit --json > audit-report.json 2>&1

# Check if audit found any issues
AUDIT_EXIT_CODE=$?

if [ $AUDIT_EXIT_CODE -eq 0 ]; then
  echo "✅ No vulnerabilities found!"
  echo ""
  echo "Your dependencies are secure."
  echo "No updates needed."

  # Clean up worktree
  cd /Users/greg/code/claude-code-coursera
  git worktree remove "$WORKTREE_PATH"
  git branch -d "$BRANCH_NAME"

  exit 0
fi

echo "⚠️  Vulnerabilities detected. Analyzing..."
echo ""

3. Categorize Vulnerabilities by Severity

Parse audit results and categorize by severity:

echo "📊 Vulnerability Analysis"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"

# Extract vulnerability counts by severity
if command -v jq >/dev/null 2>&1; then
  # Use jq if available
  CRITICAL=$(jq -r '.metadata.vulnerabilities.critical // 0' audit-report.json)
  HIGH=$(jq -r '.metadata.vulnerabilities.high // 0' audit-report.json)
  MODERATE=$(jq -r '.metadata.vulnerabilities.moderate // 0' audit-report.json)
  LOW=$(jq -r '.metadata.vulnerabilities.low // 0' audit-report.json)
  INFO=$(jq -r '.metadata.vulnerabilities.info // 0' audit-report.json)
else
  # Fallback: parse npm audit output directly
  npm audit | grep -E "Critical|High|Moderate|Low|Info" | while read -r line; do
    case "$line" in
      *Critical*) echo "$line" | awk '{print $2}' > /tmp/critical_count ;;
      *High*) echo "$line" | awk '{print $2}' > /tmp/high_count ;;
      *Moderate*) echo "$line" | awk '{print $2}' > /tmp/moderate_count ;;
      *Low*) echo "$line" | awk '{print $2}' > /tmp/low_count ;;
    esac
  done

  CRITICAL=$(cat /tmp/critical_count 2>/dev/null || echo 0)
  HIGH=$(cat /tmp/high_count 2>/dev/null || echo 0)
  MODERATE=$(cat /tmp/moderate_count 2>/dev/null || echo 0)
  LOW=$(cat /tmp/low_count 2>/dev/null || echo 0)
fi

TOTAL=$((CRITICAL + HIGH + MODERATE + LOW))

echo "🔴 Critical: $CRITICAL"
echo "🟠 High: $HIGH"
echo "🟡 Moderate: $MODERATE"
echo "🟢 Low: $LOW"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo "📋 Total vulnerabilities: $TOTAL"
echo ""

Severity definitions:

• Critical: Immediate action required, actively exploited
• High: Serious security risk, patch ASAP
• Moderate: Security concern, should fix soon
• Low: Minor issue, fix when convenient
• Info: Informational, no immediate action needed

4. Identify Vulnerable Packages

Extract the list of packages that need updating:

echo "📦 Identifying vulnerable packages..."
echo ""

# Get list of vulnerable packages
if command -v jq >/dev/null 2>&1; then
  # Extract unique package names from audit report
  VULNERABLE_PACKAGES=$(jq -r '.vulnerabilities | keys[]' audit-report.json 2>/dev/null || echo "")
else
  # Fallback: parse npm audit output
  VULNERABLE_PACKAGES=$(npm audit | grep -E "^[a-z]" | awk '{print $1}' | sort -u)
fi

if [ -z "$VULNERABLE_PACKAGES" ]; then
  echo "❌ Could not parse vulnerable packages"
  echo "Running npm audit fix instead..."

  npm audit fix

  if [ $? -eq 0 ]; then
    echo "✅ npm audit fix completed"
  else
    echo "❌ npm audit fix failed"
    echo "Manual intervention required"
  fi

  exit 0
fi

# Count packages
PACKAGE_COUNT=$(echo "$VULNERABLE_PACKAGES" | wc -l | tr -d ' ')

echo "Found $PACKAGE_COUNT vulnerable packages:"
echo "$VULNERABLE_PACKAGES" | while read -r pkg; do
  echo "  • $pkg"
done
echo ""

5. Determine Execution Strategy

Based on the number of packages, choose sequential or parallel execution:

echo "🎯 Determining execution strategy..."
echo ""

if [ "$ARGUMENTS" = "." ] || [ "$ARGUMENTS" = "all" ]; then
  # Process all vulnerable packages
  PACKAGES_TO_UPDATE="$VULNERABLE_PACKAGES"
  UPDATE_MODE="all"
elif echo "$ARGUMENTS" | grep -q '\*'; then
  # Glob pattern matching
  PACKAGES_TO_UPDATE=$(echo "$VULNERABLE_PACKAGES" | grep "$ARGUMENTS")
  UPDATE_MODE="pattern"
else
  # Specific packages
  PACKAGES_TO_UPDATE="$ARGUMENTS"
  UPDATE_MODE="specific"
fi

UPDATE_COUNT=$(echo "$PACKAGES_TO_UPDATE" | wc -l | tr -d ' ')

echo "Update mode: $UPDATE_MODE"
echo "Packages to update: $UPDATE_COUNT"
echo ""

# Choose execution strategy
if [ $UPDATE_COUNT -gt 3 ]; then
  echo "📊 Multiple packages detected ($UPDATE_COUNT packages)"
  echo "🚀 Using parallel execution for efficiency"
  echo ""
  echo "Strategy:"
  echo "  • Split into groups of 2 packages per agent"
  echo "  • Launch parallel Task agents"
  echo "  • Each agent updates and validates independently"
  echo "  • Collect and merge results"
  echo ""
  EXECUTION_MODE="parallel"
else
  echo "📝 Processing $UPDATE_COUNT packages sequentially"
  echo ""
  EXECUTION_MODE="sequential"
fi

Execution strategies:

• 1-3 packages: Sequential (simpler, easier to debug)
• 4+ packages: Parallel (faster, more efficient)

6. Execute Updates (Sequential Mode)

For ≤3 packages, update one by one:

if [ "$EXECUTION_MODE" = "sequential" ]; then
  echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
  echo "Starting sequential updates..."
  echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
  echo ""

  SUCCESS_COUNT=0
  FAILURE_COUNT=0
  FAILED_PACKAGES=""

  echo "$PACKAGES_TO_UPDATE" | while read -r package; do
    if [ -z "$package" ]; then
      continue
    fi

    echo "📦 Updating: $package"
    echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"

    # Get current version
    CURRENT_VERSION=$(npm list "$package" --depth=0 2>/dev/null | grep "$package" | awk -F@ '{print $NF}')
    echo "Current version: $CURRENT_VERSION"

    # Update package
    npm install "$package@latest" --save

    if [ $? -ne 0 ]; then
      echo "❌ Failed to install $package@latest"
      FAILURE_COUNT=$((FAILURE_COUNT + 1))
      FAILED_PACKAGES="$FAILED_PACKAGES\n  • $package"
      continue
    fi

    # Get new version
    NEW_VERSION=$(npm list "$package" --depth=0 2>/dev/null | grep "$package" | awk -F@ '{print $NF}')
    echo "New version: $NEW_VERSION"

    # Validate the update
    echo ""
    echo "Running validation..."

    # Build
    echo "  1/4 Build..."
    npm run build >/dev/null 2>&1
    if [ $? -ne 0 ]; then
      echo "  ❌ Build failed after updating $package"
      FAILURE_COUNT=$((FAILURE_COUNT + 1))
      FAILED_PACKAGES="$FAILED_PACKAGES\n  • $package (build failed)"
      # Revert
      npm install "$package@$CURRENT_VERSION" --save
      continue
    fi
    echo "  ✅ Build passed"

    # Lint
    echo "  2/4 Lint..."
    npm run lint >/dev/null 2>&1
    if [ $? -ne 0 ]; then
      echo "  ❌ Lint failed after updating $package"
      FAILURE_COUNT=$((FAILURE_COUNT + 1))
      FAILED_PACKAGES="$FAILED_PACKAGES\n  • $package (lint failed)"
      npm install "$package@$CURRENT_VERSION" --save
      continue
    fi
    echo "  ✅ Lint passed"

    # Unit tests
    echo "  3/4 Unit tests..."
    npm test >/dev/null 2>&1
    if [ $? -ne 0 ]; then
      echo "  ❌ Tests failed after updating $package"
      FAILURE_COUNT=$((FAILURE_COUNT + 1))
      FAILED_PACKAGES="$FAILED_PACKAGES\n  • $package (tests failed)"
      npm install "$package@$CURRENT_VERSION" --save
      continue
    fi
    echo "  ✅ Tests passed"

    # E2E tests
    echo "  4/4 E2E tests..."
    npm run test:e2e >/dev/null 2>&1
    if [ $? -ne 0 ]; then
      echo "  ❌ E2E tests failed after updating $package"
      FAILURE_COUNT=$((FAILURE_COUNT + 1))
      FAILED_PACKAGES="$FAILED_PACKAGES\n  • $package (e2e failed)"
      npm install "$package@$CURRENT_VERSION" --save
      continue
    fi
    echo "  ✅ E2E tests passed"

    echo ""
    echo "✅ Successfully updated: $package ($CURRENT_VERSION → $NEW_VERSION)"
    echo ""
    SUCCESS_COUNT=$((SUCCESS_COUNT + 1))
  done

  echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
  echo "Sequential Update Summary"
  echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
  echo "✅ Successful: $SUCCESS_COUNT"
  echo "❌ Failed: $FAILURE_COUNT"

  if [ $FAILURE_COUNT -gt 0 ]; then
    echo ""
    echo "Failed packages:"
    echo -e "$FAILED_PACKAGES"
  fi
  echo ""
fi

7. Execute Updates (Parallel Mode)

For >3 packages, use parallel agents:

if [ "$EXECUTION_MODE" = "parallel" ]; then
  echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
  echo "Starting parallel updates..."
  echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
  echo ""

  # Split packages into groups
  # Group size: 2 packages per agent
  GROUP_SIZE=2

  # Calculate number of groups needed
  NUM_GROUPS=$(( (UPDATE_COUNT + GROUP_SIZE - 1) / GROUP_SIZE ))

  echo "Parallel execution plan:"
  echo "  • Total packages: $UPDATE_COUNT"
  echo "  • Packages per agent: $GROUP_SIZE"
  echo "  • Number of agents: $NUM_GROUPS"
  echo ""

  # Claude will use Task tool with general-purpose subagents
  # Each subagent will receive a subset of packages to update
  #
  # Conceptual breakdown:
  # - Agent 1: packages 1-2
  # - Agent 2: packages 3-4
  # - Agent 3: packages 5-6
  # ...
  #
  # Each agent independently:
  # 1. Updates its assigned packages
  # 2. Runs full validation suite for each
  # 3. Reports success/failure
  # 4. Reverts on failure
  #
  # Main process waits for all agents to complete,
  # then collects and merges results

  echo "⏳ Launching parallel agents..."
  echo ""

  # The actual Task tool usage will be handled by Claude
  # This is a placeholder showing the conceptual approach
  #
  # For each group:
  #   Task({
  #     subagent_type: 'general-purpose',
  #     description: `Update packages: ${group.join(', ')}`,
  #     prompt: `Update these packages with full validation: ${packages}
  #              For each package:
  #              1. npm install package@latest
  #              2. Run build, lint, test, e2e
  #              3. Revert if any validation fails
  #              4. Report results`,
  #     run_in_background: true
  #   })
  #
  # Wait for all agents
  # Collect results
  # Generate summary

  echo "✅ All agents completed"
  echo ""
fi

Parallel execution benefits:

• Speed: 3-5x faster for large updates
• Resource utilization: Better use of available CPU
• Scalability: Handles dozens of packages efficiently

Parallel execution challenges:

• Complexity: More moving parts
• Debugging: Harder to trace failures
• Coordination: Need to merge results
• Rate limits: May hit npm registry limits

8. Run Post-Update Security Audit

After updates, verify vulnerabilities are fixed:

echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo "Running post-update security audit..."
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo ""

npm audit --json > audit-report-after.json 2>&1
AUDIT_EXIT_CODE=$?

if [ $AUDIT_EXIT_CODE -eq 0 ]; then
  echo "✅ No vulnerabilities remaining!"
  echo ""
  REMAINING_VULNS=0
else
  # Count remaining vulnerabilities
  if command -v jq >/dev/null 2>&1; then
    CRITICAL_AFTER=$(jq -r '.metadata.vulnerabilities.critical // 0' audit-report-after.json)
    HIGH_AFTER=$(jq -r '.metadata.vulnerabilities.high // 0' audit-report-after.json)
    MODERATE_AFTER=$(jq -r '.metadata.vulnerabilities.moderate // 0' audit-report-after.json)
    LOW_AFTER=$(jq -r '.metadata.vulnerabilities.low // 0' audit-report-after.json)
  else
    CRITICAL_AFTER=0
    HIGH_AFTER=0
    MODERATE_AFTER=0
    LOW_AFTER=0
  fi

  REMAINING_VULNS=$((CRITICAL_AFTER + HIGH_AFTER + MODERATE_AFTER + LOW_AFTER))

  echo "⚠️  Remaining vulnerabilities: $REMAINING_VULNS"
  echo ""
  echo "🔴 Critical: $CRITICAL_AFTER (was: $CRITICAL)"
  echo "🟠 High: $HIGH_AFTER (was: $HIGH)"
  echo "🟡 Moderate: $MODERATE_AFTER (was: $MODERATE)"
  echo "🟢 Low: $LOW_AFTER (was: $LOW)"
  echo ""
fi

# Calculate fixed count
FIXED_COUNT=$((TOTAL - REMAINING_VULNS))

echo "📊 Fix Summary:"
echo "  • Vulnerabilities fixed: $FIXED_COUNT"
echo "  • Vulnerabilities remaining: $REMAINING_VULNS"
echo ""

9. Generate Comprehensive Security Report

Create detailed report with all findings:

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🔒 SECURITY AUDIT REPORT
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

📅 Date: $(date '+%Y-%m-%d %H:%M:%S')
📁 Worktree: $WORKTREE_PATH
🌿 Branch: $BRANCH_NAME

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
📊 VULNERABILITY SUMMARY
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Initial Scan:
  🔴 Critical: $CRITICAL
  🟠 High: $HIGH
  🟡 Moderate: $MODERATE
  🟢 Low: $LOW
  ━━━━━━━━━━━━━━━━━━━━━━
  📋 Total: $TOTAL

After Updates:
  🔴 Critical: $CRITICAL_AFTER
  🟠 High: $HIGH_AFTER
  🟡 Moderate: $MODERATE_AFTER
  🟢 Low: $LOW_AFTER
  ━━━━━━━━━━━━━━━━━━━━━━
  📋 Total: $REMAINING_VULNS

Result:
  ✅ Fixed: $FIXED_COUNT vulnerabilities
  ⚠️  Remaining: $REMAINING_VULNS vulnerabilities

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
📦 PACKAGE UPDATES
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Successful Updates ($SUCCESS_COUNT):
  [List each successful package update]
  • webpack: 5.88.0 → 5.89.0 (fixed CVE-2023-XXXX)
  • react-dom: 18.2.0 → 18.3.1 (fixed CVE-2023-YYYY)
  • express: 4.18.0 → 4.19.2 (fixed CVE-2024-ZZZZ)

Failed Updates ($FAILURE_COUNT):
  [List each failed package with reason]
  • typescript: 5.1.0 → 5.3.0 (build errors)
  • jest: 29.5.0 → 30.0.0 (breaking changes)

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✅ VALIDATION RESULTS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Build:       ✓ Passed
Lint:        ✓ Passed
Unit Tests:  ✓ Passed (24/24)
E2E Tests:   ✓ Passed (12/12)

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
💡 RECOMMENDATIONS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

[If remaining vulnerabilities]

🔴 Critical Priority:
  • Review remaining critical vulnerabilities
  • Consider manual updates for failed packages
  • Check for security patches or workarounds

🟠 High Priority:
  • Address high severity issues within 7 days
  • Monitor security advisories

🟡 Medium Priority:
  • Plan updates for moderate severity issues
  • Include in next maintenance cycle

[If all fixed]

✅ All Clear:
  • No vulnerabilities detected
  • All dependencies up to date
  • Maintain regular audit schedule

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🔧 NEXT STEPS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

[If successful]
  ✅ Review changes in worktree
  ✅ Test application manually
  ✅ Merge to main branch
  ✅ Deploy updated dependencies

[If failures]
  ⚠️  Review failed package updates
  ⚠️  Check breaking change documentation
  ⚠️  Consider manual migration
  ⚠️  Address remaining vulnerabilities

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

10. Prompt for Merge Decision

Ask user whether to merge the updates:

if [ $SUCCESS_COUNT -gt 0 ] && [ $FAILURE_COUNT -eq 0 ] && [ $REMAINING_VULNS -eq 0 ]; then
  # Perfect case: all updates successful, no remaining vulnerabilities
  echo "✅ Security audit complete!"
  echo "✅ All vulnerabilities fixed"
  echo "✅ All validations passed"
  echo ""
  echo "Merge changes to main branch? (yes/no)"
  echo ""
  echo "Options:"
  echo "  yes - Merge updates and clean up worktree"
  echo "  no  - Keep worktree for manual review"

elif [ $SUCCESS_COUNT -gt 0 ] && [ $REMAINING_VULNS -gt 0 ]; then
  # Partial success: some fixed, some remaining
  echo "⚠️  Partial success"
  echo "✅ Fixed: $FIXED_COUNT vulnerabilities"
  echo "⚠️  Remaining: $REMAINING_VULNS vulnerabilities"
  echo ""
  echo "Merge partial fixes to main branch? (yes/no/review)"
  echo ""
  echo "Options:"
  echo "  yes    - Merge successful updates (progress made)"
  echo "  no     - Discard all changes (address all issues first)"
  echo "  review - Keep worktree for manual inspection"

else
  # Failure: no progress or major issues
  echo "❌ Security audit completed with issues"
  echo "❌ Failed updates: $FAILURE_COUNT"
  echo "⚠️  Remaining vulnerabilities: $REMAINING_VULNS"
  echo ""
  echo "What would you like to do? (keep/cleanup/retry)"
  echo ""
  echo "Options:"
  echo "  keep    - Preserve worktree for debugging"
  echo "  cleanup - Discard changes and remove worktree"
  echo "  retry   - Try npm audit fix --force (may break)"
fi

11. Handle Merge (If Yes)

If user chooses to merge successful updates:

echo "Merging security updates to main branch..."
echo ""

# Navigate back to original repo
cd /Users/greg/code/claude-code-coursera

# Show what will be merged
echo "Changes to merge:"
git diff main..$BRANCH_NAME --stat

echo ""
echo "Proceed with merge? (yes/no)"
# Wait for confirmation

# Merge
git merge "$BRANCH_NAME"

if [ $? -ne 0 ]; then
  echo "❌ Merge conflict detected"
  echo ""
  echo "This is unusual for dependency updates."
  echo "Likely causes:"
  echo "  • package.json modified in main"
  echo "  • package-lock.json conflicts"
  echo ""
  echo "Resolve manually:"
  echo "  1. git status"
  echo "  2. Edit conflicting files"
  echo "  3. git add <files>"
  echo "  4. git merge --continue"
  exit 1
fi

echo "✅ Merge successful"
echo ""

# Offer to push
echo "Push to remote? (yes/no)"
# Wait for response

# Clean up
git worktree remove "$WORKTREE_PATH"
git branch -d "$BRANCH_NAME"

echo ""
echo "✅ Security updates merged successfully"
echo "✅ Worktree cleaned up"
echo ""
echo "Don't forget to:"
echo "  • Test application in production environment"
echo "  • Monitor for any runtime issues"
echo "  • Update deployment pipelines if needed"

12. Handle Manual Review (If No/Review)

If user wants to review manually:

echo "Worktree preserved for review"
echo ""
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo "📁 Worktree Location"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo ""
echo "Path: $WORKTREE_PATH"
echo "Branch: $BRANCH_NAME"
echo ""
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo "🔍 Review Changes"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo ""
echo "Review package updates:"
echo "  cd $WORKTREE_PATH/expense-tracker-ai"
echo "  git diff HEAD package.json"
echo "  git diff HEAD package-lock.json"
echo ""
echo "Test application:"
echo "  npm run dev"
echo "  # Test functionality in browser"
echo ""
echo "Check dependencies:"
echo "  npm list --depth=0"
echo "  npm audit"
echo ""
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo "🔄 Merge When Ready"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo ""
echo "Merge to main:"
echo "  cd /Users/greg/code/claude-code-coursera"
echo "  git merge $BRANCH_NAME"
echo "  git push origin main"
echo ""
echo "Clean up:"
echo "  git worktree remove $WORKTREE_PATH"
echo "  git branch -d $BRANCH_NAME"
echo ""

Error Handling

Common Error Scenarios

Build Failure After Update

❌ Build failed after updating webpack

Error: Module not found: '@types/webpack'

Resolution:
1. Install missing types: npm install --save-dev @types/webpack
2. Re-run build: npm run build
3. If still failing, check breaking changes in webpack docs

Dependency Conflict

❌ npm ERR! ERESOLVE unable to resolve dependency tree

Conflict:
  react@18.3.0 requires webpack@^5.90.0
  Current webpack: 5.88.0

Resolution:
1. Update react first: npm install react@latest
2. Then update webpack: npm install webpack@latest
3. Or use --force (may cause issues):
   npm install webpack@latest --force

Test Failures After Update

❌ Tests failed after updating jest

Error: Unknown option 'testEnvironment'

Cause: Breaking change in jest 30.x

Resolution:
1. Review migration guide:
   https://jestjs.io/docs/upgrading-to-jest30
2. Update jest.config.js
3. Update test files if needed

No Fix Available

⚠️  Vulnerability in transitive dependency

Package: some-deep-dependency
Severity: High
Fixable: No

Your package → intermediate-package → some-deep-dependency

Resolution:
1. Check if intermediate-package has update
2. Contact maintainer of intermediate-package
3. Consider alternative package
4. Monitor for security patch

Advanced Usage

Audit Specific Packages

# Audit and fix only React-related packages
audit-and-fix react*

# Audit and fix webpack and babel
audit-and-fix webpack babel

# Audit and fix all testing libraries
audit-and-fix @testing-library/*

Audit by Severity

# Fix only critical vulnerabilities
# (requires custom filtering logic)
audit-and-fix . --severity=critical

# Fix critical and high severity
audit-and-fix . --severity=critical,high

Dry Run Mode

# Show what would be updated without actually updating
audit-and-fix . --dry-run

# Expected output:
# Would update:
#   • webpack: 5.88.0 → 5.89.0
#   • react-dom: 18.2.0 → 18.3.1
#   • express: 4.18.0 → 4.19.2

Performance Metrics

Sequential vs Parallel Comparison

Sequential (3 packages):

• Time: ~15 minutes
• Memory: Low
• Debuggability: Easy

Parallel (12 packages):

• Time: ~5 minutes (3x faster)
• Memory: Medium
• Debuggability: Moderate

Recommendation:

• Use sequential for ≤3 packages
• Use parallel for 4+ packages
• Consider sequential if debugging issues

Related Skills and Commands

• Simple Audit: Use existing .claude/skills/security-audit.md
• Package Updates: Use existing .claude/commands/npm-latest.md
• E2E Testing: Use existing .claude/commands/e2e-test.md
• Skills Guide: See skills.md for more patterns

Summary

This skill demonstrates:

✅ Complex conditional logic - Different strategies based on package count ✅ Parallel execution - Using Task tool with subagents for scale ✅ Comprehensive validation - Build, lint, unit tests, e2e tests ✅ Error categorization - Grouping failures by type ✅ Rollback on failure - Reverting packages that break validation ✅ Detailed reporting - Security report with before/after comparison ✅ User decision points - Multiple prompts for user control ✅ Cleanup handling - Proper worktree and branch cleanup

This is the most complex skill example, showcasing advanced patterns for production-grade automation.