# CLI Model Flag Implementation Summary

## ✅ Implementation Complete

The `--model` flag has been successfully implemented in the Claude PM Framework CLI with full integration and validation.

## 🚀 Features Implemented

### 1. CLI Argument Parser Enhancement
- **Location**: `/claude_pm/cli/__init__.py`
- **Feature**: Added `--model` / `-m` flag to main CLI group
- **Validation**: Integrated with ModelType enum validation
- **Storage**: Model selection stored in Click context object (`ctx.obj["model"]`)

### 2. Model Resolution System
- **Function**: `_resolve_model_selection(model_input: str) -> Optional[str]`
- **Aliases Support**: 
  - `sonnet` → `claude-sonnet-4-20250514`
  - `opus` → `claude-4-opus`
  - `haiku` → `claude-3-haiku-20240307`
  - `sonnet3` → `claude-3-5-sonnet-20241022`
  - `opus3` → `claude-3-opus-20240229`
  - Plus numbered variants (`sonnet4`, `opus4`)
- **Validation**: Full model ID validation against ModelType enum
- **Partial Matching**: Supports partial model ID matching for convenience

### 3. Context Integration
- **Function**: `get_model_override(ctx: click.Context) -> Optional[str]`
- **Function**: `create_model_selector_with_override(ctx: click.Context)`
- **Environment Variable**: Automatically sets `CLAUDE_PM_MODEL_OVERRIDE`
- **Backward Compatibility**: Existing code using ModelSelector automatically picks up overrides

### 4. Models Command
- **Command**: `claude-pm models`
- **Options**: 
  - `--verbose`: Show detailed model configurations
  - `--aliases`: Show model aliases and mappings
- **Features**:
  - Model configuration table (tokens, context window, cost/speed tiers)
  - Agent model assignments display
  - Current override display
  - Usage examples and environment variable documentation

### 5. User Experience Features
- **Help Text**: Comprehensive help with examples
- **Verbose Mode**: Shows selected model when `--verbose` flag used
- **Invalid Model Handling**: Warning messages for invalid models, continues with defaults
- **Override Display**: Shows current override in models command when active

## 🧪 Testing Results

All functionality tested and verified:

✅ **Model Resolution**: All aliases resolve correctly  
✅ **CLI Integration**: Flag appears in help and processes correctly  
✅ **Context Storage**: Model override properly stored and accessible  
✅ **Models Command**: All display modes working correctly  
✅ **Validation**: Invalid models show warnings but don't break execution  
✅ **Environment Integration**: ModelSelector automatically uses CLI override  
✅ **Backward Compatibility**: Existing code works without modification  

## 📋 Usage Examples

```bash
# Basic usage with aliases
claude-pm --model sonnet status
claude-pm --model opus test
claude-pm --model haiku agents status

# Full model ID usage
claude-pm --model claude-sonnet-4-20250514 models --verbose

# Model exploration
claude-pm models                    # Basic model info
claude-pm models --aliases          # Show aliases
claude-pm models --verbose          # Detailed info
claude-pm --model opus models       # Show with override

# Integration with existing commands
claude-pm --model sonnet setup
claude-pm --model opus deployment-status
```

## 🔧 Integration Points

### For Command Developers

1. **Simple Override Check**:
   ```python
   from claude_pm.cli.cli_utils import get_model_override
   
   @click.pass_context
   def my_command(ctx):
       model = get_model_override(ctx)
       if model:
           print(f"Using model: {model}")
   ```

2. **ModelSelector Integration**:
   ```python
   from claude_pm.cli.cli_utils import create_model_selector_with_override
   
   @click.pass_context
   def my_command(ctx):
       selector = create_model_selector_with_override(ctx)
       model_type, config = selector.select_model_for_agent('engineer')
   ```

3. **Automatic Environment Integration**:
   ```python
   # Existing ModelSelector code automatically picks up CLI override
   from claude_pm.services.model_selector import ModelSelector
   
   def my_function():
       selector = ModelSelector()  # Automatically uses CLI override
       return selector.select_model_for_agent('qa')
   ```

## 📁 Files Modified

- `/claude_pm/cli/__init__.py` - Main CLI argument parser
- `/claude_pm/cli/cli_utils.py` - Utility functions for model override access
- `/claude_pm/cli/system_commands.py` - Models command implementation

## 📚 Documentation Created

- `/claude_pm/cli/MODEL_INTEGRATION_EXAMPLE.md` - Integration guide for command developers
- `/claude_pm/cli/MODEL_FLAG_IMPLEMENTATION_SUMMARY.md` - This summary document

## 🎯 Next Steps

The implementation is complete and ready for use. Command developers can now:

1. Use `get_model_override()` to check for CLI model overrides
2. Use `create_model_selector_with_override()` for ModelSelector integration
3. Rely on automatic environment variable integration for existing code
4. Use the `models` command to help users understand available options

## 🚀 Benefits

- **User-Friendly**: Simple aliases make model selection intuitive
- **Comprehensive**: Full model ID support for advanced users
- **Integrated**: Works seamlessly with existing ModelSelector infrastructure
- **Validated**: Proper error handling and user feedback
- **Documented**: Clear examples and integration patterns
- **Backward Compatible**: Existing code continues to work unchanged