nano-banana-use
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 stat...
Full skill instructions
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.
Ensure you have one of the following authentication methods configured in your environment:
API Key:
GOOGLE_API_KEY or GEMINI_API_KEYVertex AI:
GOOGLE_CLOUD_PROJECTGOOGLE_CLOUD_LOCATIONGOOGLE_GENAI_USE_VERTEXAI=1Step 1: Confirm Parameters Before running the script, confirm the following parameters with the user or state the defaults you will use:
gemini-3-pro-image-preview.1:1.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 "A futuristic banana city" --output city.png
Modify an existing image based on a text prompt.
uv run skills/nano-banana-use/scripts/edit_image.py original.png "Make the sky purple" --output edited.png
Generate a new image based on multiple input images and a prompt.
uv run skills/nano-banana-use/scripts/compose_image.py --image style.png --image subject.jpg "A painting of the subject in the style of the first image" --output composition.png
prompt: The text description of the image.--model: The model to use. Defaults to gemini-3-pro-image-preview.--output: The filename for the saved image. Defaults to generated_image.png.--aspect-ratio: The aspect ratio of the generated image. Defaults to 1:1. Supported: 1:1, 16:9, 4:3, 3:4, 9:16.--safety-filter-level: Safety filter threshold. Defaults to BLOCK_MEDIUM_AND_ABOVE.
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