fix: improve google/nano-banana image_input parameter handling

- Fixed critical bug where google/nano-banana model requires URLs not local file paths for image_input parameter
- Added special handling for nano-banana image_input to skip local paths and show clear warnings
- Updated config.py documentation to clearly state nano-banana URL requirements and square format limitation
- Enhanced error messages to help users understand nano-banana parameter requirements
- Improved parameter validation and user feedback for better debugging experience

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: preangelleo

replicate_batch_process/config.py

@@ -137,10 +137,10 @@
         'specialized': 'high_quality_detailed_images_with_reference',
         'scenario': 'premium_quality_generation_with_reference_images',
         'reference_image': True,
-        'description': "Google's Gemini 2.5 Flash Image model (nicknamed 'Nano Banana') - A state-of-the-art image generation model that supports up to 3 reference images for style transfer and context understanding.",
+        'description': "Google's Gemini 2.5 Flash Image model (nicknamed 'Nano Banana') - A state-of-the-art image generation model that supports up to 3 reference images for style transfer and context understanding. IMPORTANT: Only generates square format (1024x1024) images.",
         'supported_params': {
             'prompt': {'type': 'str', 'default': None, 'required': True, 'description': 'Text prompt describing the desired image'},
-            'image_input': {'type': 'list', 'default': None, 'description': 'List of reference image URLs or file paths (maximum 3 images)'},
+            'image_input': {'type': 'list', 'default': None, 'description': 'List of reference image URLs (maximum 3 images). IMPORTANT: Must be URLs, not local file paths. Local files will be skipped.'},
             'output_format': {'type': 'select', 'default': 'jpg', 'options': ['jpg', 'png'], 'description': 'Output image format'}
         }
     }

replicate_batch_process/main.py

@@ -418,7 +418,26 @@ def replicate_model_calling(prompt, model_name, **kwargs):
             # Add parameters from kwargs that are supported by the model
             for param_name, param_config in supported_params.items():
                 if param_name in current_kwargs:
-                    # Handle file inputs specially
+                    # Handle special cases for google/nano-banana image_input (requires URLs only)
+                    if model_name == 'google/nano-banana' and param_name == 'image_input':
+                        image_list = current_kwargs[param_name]
+                        if isinstance(image_list, list):
+                            url_list = []
+                            for img in image_list:
+                                if isinstance(img, str):
+                                    if img.startswith(('http://', 'https://')):
+                                        url_list.append(img)
+                                    else:
+                                        print(f"⚠️  google/nano-banana requires URLs for image_input, not file paths: {img}")
+                                        print(f"   Skipping local file path. Upload to a hosting service first.")
+                            if url_list:
+                                input_params[param_name] = url_list
+                                print(f"📁 Using {len(url_list)} image URLs for nano-banana")
+                            else:
+                                print(f"⚠️  No valid URLs found for google/nano-banana image_input parameter")
+                        continue
+                    
+                    # Handle other file inputs normally
                     if param_config.get('type') == 'file' and current_kwargs[param_name] is not None:
                         file_input = current_kwargs[param_name]
                         # If it's a string, treat as file path or URL