Nano Banana Image Generator

Overview

This skill enables AI-powered image generation using Nano Banana Pro (powered by Gemini). Generated images are automatically saved to the user's public images folder for easy access.

When to Use

• User asks to "generate an image of..."
• User asks to "create a picture of..."
• User asks to "make an illustration of..."
• User wants visual content created from a text description
• User mentions "Nano Banana" for image generation

Workflow

Step 1: Generate the Image

Use the Composio/Rube MCP tools to generate the image:

1. Call RUBE_SEARCH_TOOLS with the query "generate images using nano banana" to get session ID
2. Call RUBE_MULTI_EXECUTE_TOOL with tool_slug GEMINI_GENERATE_IMAGE

Tool Parameters:

• prompt (required): The text description of the image to generate
• model: Use gemini-3-pro-image-preview for Nano Banana Pro (default, best quality with 4K support)
• aspect_ratio: Options include 1:1, 16:9, 9:16, 4:3, 3:4, etc.
• image_size: For Nano Banana Pro, options are 1K, 2K, or 4K

Example execution:

RUBE_MULTI_EXECUTE_TOOL with:
  tool_slug: "GEMINI_GENERATE_IMAGE"
  arguments: {
    "prompt": "A cute cat wearing sunglasses on a beach",
    "model": "gemini-3-pro-image-preview",
    "aspect_ratio": "16:9",
    "image_size": "2K"
  }

The tool returns a public S3 URL with the generated image.

Step 2: Download and Save to Public Folder

After receiving the image URL from the generation tool:

1. Download the image using curl or wget
2. Save it to the public images folder: /Users/mac/Public/images/
3. Use a descriptive filename based on the prompt (e.g., cat-sunglasses-beach.png)

Example:

curl -o "/Users/mac/Public/images/cat-sunglasses-beach.png" "<generated-image-url>"

Step 3: Confirm to User

After saving:

1. Confirm the image was generated and saved
2. Provide the local file path
3. Optionally display the image if in a supported environment

Important Notes

• Always set sync_response_to_workbench: false when calling RUBE_MULTI_EXECUTE_TOOL for image generation
• The public images folder is /Users/mac/Public/images/ - create it if it doesn't exist
• Use descriptive, kebab-case filenames derived from the prompt
• The Gemini connection is already active and ready to use