nano-banana-use

name	nano-banana-use
description	Generate, edit, and compose images using Gemini Nano Banana models via portable Python scripts. Handles authentication via API Key or Vertex AI environment variables. Available parameters: prompt, model, aspect-ratio, safety-filter-level. Always confirm parameters with the user or explicitly state defaults before running.

Nano Banana Use

Use this skill to generate, edit, and compose images using Gemini's Nano Banana models (gemini-2.5-flash-image and gemini-3-pro-image-preview).

This skill uses portable Python scripts managed by uv.

Prerequisites

Ensure you have one of the following authentication methods configured in your environment:

1. API Key:

   • GOOGLE_API_KEY or GEMINI_API_KEY

2. Vertex AI:

   • GOOGLE_CLOUD_PROJECT
   • GOOGLE_CLOUD_LOCATION
   • GOOGLE_GENAI_USE_VERTEXAI=1

Usage

Generate an Image

Step 1: Confirm Parameters Before running the script, confirm the following parameters with the user or state the defaults you will use:

• Prompt: The image description.
• Model: Default is gemini-3-pro-image-preview.
• Aspect Ratio: Default is 1:1.
• Safety Filter: Default is BLOCK_MEDIUM_AND_ABOVE.

Step 2: Run the Script Run the python script using uv:

uv run skills/nano-banana-use/scripts/generate_image.py  --output city.png