Token Allocation Strategy (200K Sonnet context):
├── System Prompt & Instructions: ~15K tokens (7.5%)
│   ├── CLAUDE.md: ~8K
│   ├── Command definitions: ~4K
│   └── Skill metadata: ~3K
├── Active Conversation: ~80K tokens (40%)
│   ├── Recent messages: ~50K
│   ├── Context cache: ~20K
│   └── Active references: ~10K
├── Reference Context (Progressive Disclosure): ~50K (25%)
│   ├── Project structure: ~15K
│   ├── Related Skills: ~20K
│   └── Tool definitions: ~15K
└── Reserve (Emergency Recovery): ~55K tokens (27.5%)
    ├── Session state snapshot: ~10K
    ├── TAGs and cross-references: ~15K
    ├── Error recovery context: ~20K
    └── Free buffer: ~10K

Step 1: Original context (50K tokens)
Step 2: Compress to summary (15K tokens)
Step 3: Add pointers to original → 35K tokens saved
Step 4: Carry forward summary only across handoffs

❌ Bad (high token cost):
"The user configuration from the previous 20 messages..."

✅ Good (efficient reference):

├── Critical Context (ALWAYS keep)
│   ├── Current task objectives
│   ├── User preferences & expertise level
│   └── Active constraints
├── Supporting Context (keep if space allows)
│   ├── Related history
│   ├── Reference documentation
│   └── Tool availability
└── Temporary Context (discard when not needed)
    ├── Raw tool outputs
    ├── Intermediate calculations
    └── Debug information

undefined

**Technique 5: Task-Based Session Management**

---

Session State Stack (Enterprise ):
├── L1: Context-Aware Layer (Claude 4.5+ feature)
│   ├── Token budget tracking
│   ├── Context window position
│   ├── Auto-summarization triggers
│   └── Model-specific optimizations
├── L2: Active Context (current task, variables, scope)
├── L3: Session History (recent actions, decisions)
├── L4: Project State (SPEC progress, milestones)
├── L5: User Context (preferences, language, expertise)
└── L6: System State (tools, permissions, environment)

{
  "session_id": "sess_uuid_v4",
  "model": "claude-sonnet-4-5-20250929",
  "created_at": "2025-11-12T10:30:00Z",
  "context_window": {
    "total": 200000,
    "used": 85000,
    "available": 115000,
    "position_percent": 42.5
  },
  "persistence": {
    "auto_load_history": true,
    "context_preservation": "critical_only",
    "cache_enabled": true
  },
  "forking": {
    "enabled": true,
    "fork_session_id": "sess_fork_uuid",
    "checkpoint_timestamp": "2025-11-12T10:30:00Z"
  }
}

undefined

---

Workflow State Transitions:

pending → in_progress → blocked (waiting) → completed/failed
             ↓                                    ↓
         [monitor token budget]          [save checkpoint]
         [track elapsed time]            [update history]
         [check for recovery]            [archive state]

def token_budget_callback(context):
    """
    Called automatically when token budget changes.
    Model provides real-time context awareness.
    """
    
    remaining_tokens = context.available_tokens
    used_percent = context.token_usage_percent
    
    if used_percent > 85:
        # Activate emergency summarization
        compress_context_window()
        archive_old_context()
        
    elif used_percent > 75:
        # Start progressive disclosure
        defer_non_critical_context()
        
    elif used_percent > 60:
        # Monitor for safety
        track_context_growth()

{
  "handoff_id": "uuid-v4",
  "timestamp": "2025-11-12T10:30:00Z",
  "from_agent": "spec-builder",
  "to_agent": "tdd-implementer",
  "session_context": {
    "session_id": "sess_uuid",
    "model": "claude-sonnet-4-5-20250929",
    "context_position": 42.5,
    "available_tokens": 115000,
    "user_language": "ko",
    "expertise_level": "intermediate",
    "current_project": "MoAI-ADK"
  },
  "task_context": {
    "spec_id": "SPEC-001",
    "current_phase": "implementation",
    "completed_steps": ["spec_complete", "architecture_defined"],
    "next_step": "write_tests",
    "constraints": ["must_use_pytest", "coverage_85"]
  },
  "context_snapshot": {
    "critical_context": "...compressed...",
    "session_checkpoints": [...],
    "active_todos": [...],
    "token_budget_strategy": "progressive_summarization"
  },
  "recovery_info": {
    "last_checkpoint": "2025-11-12T10:25:00Z",
    "recovery_tokens_reserved": 55000,
    "session_fork_available": true
  }
}

def validate_handoff(handoff_package):
    """Enterprise validation with token budget check"""
    
    required_fields = [
        'handoff_id', 'from_agent', 'to_agent',
        'session_context', 'task_context', 'context_snapshot'
    ]
    
    for field in required_fields:
        if field not in handoff_package:
            raise HandoffError(f"Missing required field: {field}")
    
    # NEW : Validate token budget
    context = handoff_package['session_context']
    available = context['available_tokens']
    if available < 30000:  # Minimum safe buffer
        trigger_context_compression()
    
    # Validate agent compatibility
    if not can_agents_cooperate(
        handoff_package['from_agent'],
        handoff_package['to_agent']
    ):
        raise AgentCompatibilityError("Agents cannot cooperate")
    
    return True

{
  "checkpoint_id": "ckpt_uuid",
  "timestamp": "2025-11-12T10:30:00Z",
  "phase": "GREEN",
  "token_usage": {
    "used": 85000,
    "available": 115000
  },
  "context_snapshot": "...compressed snapshot...",
  "session_id": "sess_uuid",
  "recovery_tokens_reserved": 55000
}

def sync_memory_files(session_state):
    """Ensure memory files reflect current session state"""
    
    # Update session metadata with token info
    update_session_metadata({
        'session_id': session_state.id,
        'token_usage': session_state.token_budget,
        'context_position': session_state.context_position,
        'last_sync': timestamp()
    })
    
    # Sync TodoWrite tasks
    sync_todowrite_tasks(session_state.active_tasks)
    
    # Update context cache (compressed)
    update_context_cache(compress_context(session_state.context))
    
    # Log token usage for analytics
    log_token_usage({
        'timestamp': timestamp(),
        'used': session_state.tokens_used,
        'available': session_state.tokens_available,
        'percent': session_state.usage_percent
    })
    
    # Archive old checkpoints (>7 days)
    archive_old_checkpoints()

{
  "session": {
    "persistence_enabled": true,
    "auto_checkpoint": true,
    "checkpoint_interval_minutes": 10,
    "recovery_strategy": "progressive_summarization",
    "context_budget": {
      "warning_threshold_percent": 75,
      "emergency_threshold_percent": 85,
      "reserve_tokens": 55000
    },
    "forking_enabled": true,
    "max_parallel_sessions": 3
  }
}

undefined

undefined