┌──────────┐    ┌────────────┐    ┌──────────┐    ┌──────────┐    ┌───────────┐
│ phoenix  │───▶│   plan-    │───▶│  kraken  │───▶│plan-reviewer│───▶│ arbiter  │
│          │    │   agent    │    │          │    │          │    │           │
└──────────┘    └────────────┘    └──────────┘    └──────────┘    └───────────┘
  Analyze         Plan             Implement       Review          Verify
  current         changes          refactor        changes         tests pass

Task(
  subagent_type="phoenix",
  prompt="""
  Analyze for refactoring: [TARGET_CODE]

  Identify:
  - Current pain points
  - Code smells
  - Improvement opportunities
  - Risk areas
  - Test coverage gaps
  """
)

Task(
  subagent_type="plan-agent",
  prompt="""
  Plan refactoring: [TARGET_CODE]

  Analysis: [from phoenix]

  Create:
  - Step-by-step refactoring plan
  - Each step should be:
    - Small and focused
    - Independently testable
    - Reversible
  - Identify files affected
  - Risk mitigation strategy
  """
)

Task(
  subagent_type="kraken",
  prompt="""
  Implement refactoring: [TARGET_CODE]

  Plan: [from plan-agent]

  Requirements:
  - Follow plan exactly
  - Run tests after each step
  - Stop if tests fail
  - NO behavior changes
  """
)

Task(
  subagent_type="plan-reviewer",
  prompt="""
  Review refactoring: [TARGET_CODE]

  Changes: [git diff from kraken]

  Check:
  - Behavior preserved
  - No unintended changes
  - Code quality improved
  - Patterns consistent
  """
)

Task(
  subagent_type="arbiter",
  prompt="""
  Validate refactoring: [TARGET_CODE]

  - Run full test suite
  - Verify no regressions
  - Check type errors
  - Run linting
  """
)

phoenix → plan-agent → kraken → plan-reviewer → arbiter

phoenix → kraken → arbiter  (simpler, skip detailed planning)

phoenix → plan-agent → [kraken → plan-reviewer] × N phases → arbiter

User: /refactor Extract the validation logic into a separate module

Claude: Starting /refactor workflow...

Phase 1: Analyzing current structure...
[Spawns phoenix]
Found: Validation logic spread across 4 files
- form.ts (lines 45-120)
- api.ts (lines 200-280)
- user.ts (lines 15-45)
- order.ts (lines 88-130)

Phase 2: Planning extraction...
[Spawns plan-agent]
Plan:
1. Create src/validation/index.ts
2. Extract common validators
3. Update imports one file at a time
4. Run tests after each change

Phase 3: Implementing...
[Spawns kraken]
Completed all 4 steps, tests green after each

Phase 4: Reviewing changes...
[Spawns plan-reviewer]
✅ All behavior preserved
✅ DRY improved (removed 45 duplicate lines)
✅ New structure consistent

Phase 5: Final validation...
[Spawns arbiter]
✅ 312 tests passing, 0 regressions

Refactoring complete!