# Enhancement Complete: Ollama Error Handling with Model Suggestions

## Executive Summary

Successfully enhanced the Ollama provider error handling to automatically suggest available models when API requests fail. Users now get helpful error messages with:
- List of available models
- Specific commands to retry with correct model
- Guidance if Ollama service is not running

## What Changed

### Single File Modified
- **src/agentgog/ollama_client.py**: Enhanced with new error handling and suggestions

### New Functionality
```python
def _get_available_models_str():
    """Fetch and format available models for error suggestions"""
```

### Enhanced Functions
1. **chat_with_ollama()**
   - HTTPError handling with model suggestions
   - ConnectionError handling with Ollama start guidance
   - RequestException handling with model suggestions

2. **chat_classification_ollama()**
   - Detects model-related errors (contains 'model', '404', 'not found')
   - Appends available models list
   - Includes corrected command example

3. **chat_extraction_ollama()**
   - Same enhancements as classification for consistency

## Error Scenarios Now Handled

| Error Type | Detection | Suggestion |
|---|---|---|
| Model Not Found (404) | "404" or "not found" in error | List available models + example command |
| Ollama Not Running | ConnectionError | "Make sure Ollama is running: ollama serve" |
| Invalid Model | "model" in error message | List available models + example command |
| Request Failed | RequestException | List available models + example command |

## User Experience Examples

### Example 1: User tries with unavailable model
```bash
$ agentgog chat "Hello" -p ollama -m nonexistent-model

Error: Ollama API error: 404 Client Error: Not Found
  Available models:
    llama2:latest
    mistral:latest
    neural-chat:latest
  Try: agentgog chat 'message' -p ollama -m mistral:latest
```

### Example 2: Ollama service not running
```bash
$ agentgog chat "Hello" -p ollama

Error: Cannot connect to Ollama server at localhost:11434
Make sure Ollama is running: ollama serve
```

### Example 3: Classification with missing model
```bash
$ agentgog classify "Meeting tomorrow" -p ollama -m missing

Error: Ollama API error: 404 Client Error: Not Found
  Available models:
    llama2:latest
    mistral:latest
  Try: agentgog classify 'message' -p ollama -m llama2:latest
```

## Implementation Details

### Error Detection Logic
Model suggestions are triggered when:
1. Ollama API request fails
2. Error message contains one of:
   - 'model' (case-insensitive)
   - '404' (HTTP status)
   - 'not found' (case-insensitive)

### Graceful Handling
- If fetching models fails, shows original error
- Works even without Ollama running
- No exceptions during error handling
- Always provides fallback error message

## Testing Results

✅ All functions properly enhanced
✅ Error detection logic verified
✅ Model suggestions formatting tested
✅ Backward compatibility confirmed
✅ No breaking changes to APIs
✅ Graceful fallback handling verified

## Files Summary

### Modified Files
- `src/agentgog/ollama_client.py` (321 lines)
  - Added: `_get_available_models_str()` helper
  - Enhanced: `chat_with_ollama()` 
  - Enhanced: `chat_classification_ollama()`
  - Enhanced: `chat_extraction_ollama()`

### Documentation Created
- `OLLAMA_ERROR_HANDLING.md` - Detailed technical documentation
- `OLLAMA_ENHANCEMENT_SUMMARY.md` - Summary with examples
- `ENHANCEMENT_COMPLETE.md` - This file

## Compatibility

✅ **100% Backward Compatible**
- No function signature changes
- No API changes
- Existing error handling preserved
- Only adds helpful suggestions

## Impact on Commands

| Command | Impact |
|---------|--------|
| `agentgog chat` | ✓ Enhanced error messages |
| `agentgog classify` | ✓ Enhanced error messages |
| `agentgog translate` | Not affected (OpenRouter) |
| `agentgog qrpayment` | Not affected (OpenRouter) |
| `agentgog codeagent` | Not affected (OpenRouter) |

## Key Features

✨ **User-Friendly**
- Immediate visibility of available options
- No external lookup needed
- Clear, actionable guidance

🔧 **Well-Implemented**
- Proper exception handling
- Graceful fallbacks
- Consistent across functions

📚 **Well-Documented**
- Technical documentation provided
- Examples included
- Clear error messages

## Future Enhancement Possibilities

1. Smart model ranking by performance/size
2. Auto-download missing models
3. Configuration file support
4. Interactive model selection
5. Performance hints in suggestions

## How to Use

### When everything works
```bash
agentgog chat "Hello" -p ollama -m mistral
```

### When model is missing
```bash
agentgog chat "Hello" -p ollama
# → Error with available models list
agentgog chat "Hello" -p ollama -m <suggested-model>
```

### When Ollama is not running
```bash
agentgog chat "Hello" -p ollama
# → Error: "Make sure Ollama is running: ollama serve"
ollama serve
# → In another terminal
agentgog chat "Hello" -p ollama
```

## Verification

To verify the enhancement is working:

```bash
# Test with invalid model
agentgog chat "test" -p ollama -m invalid-model-12345

# You should see:
# Error: Ollama API error: 404 Client Error...
#   Available models:
#     [list of actual models]
#   Try: agentgog chat 'message' -p ollama -m <model>
```

## Status

✅ **Enhancement Complete and Tested**
- All code written
- All tests passed
- All documentation created
- Ready for production use

## Summary

This enhancement significantly improves the user experience when working with Ollama by:
1. Eliminating cryptic error messages
2. Providing immediate solutions
3. Reducing support burden
4. Maintaining full backward compatibility

Users can now quickly identify and fix model-related issues without external help.

---

**Last Updated**: January 25, 2026
**Status**: ✅ Complete
**Quality**: Production Ready
