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Generate images using Google's Nano Banana Pro (gemini-3-pro-image-preview). Accepts text prompts and optionally images (for editing/transformation) as INPUT. Returns generated IMAGES as OUTPUT.
6 of 22 test cases passed with the skill.
Tokens, turns and time describe resource use, not a dollar price.
Lift withheld: 6 comparable cases; this report requires 8.
A test case the skill fixed. Same model, same prompt, with and without the skill.
I want to blend two reference photographs, photo_a.jpg and photo_b.jpg, into a single surreal landscape saved as landscape_blend.png. How should this command be constructed?
| Checked | Without skill | With skill |
|---|---|---|
| The command passes `-i photo_a.jpg`. | Missed | Passed |
| The command passes `-i photo_b.jpg`. | Missed | Passed |
| The command specifies `-o landscape_blend.png`. | Missed | Passed |
The instructions your model reads when the skill loads.
Generate images using Google's advanced Nano Banana Pro model (gemini-3-pro-image-preview).
The user must have GEMINI_API_KEY environment variable set with a valid Google AI API key.
The script is located in the same directory as this SKILL.md file. Run it with uv run:
uv run /path/to/skills/nano-banana-pro/generate_image.py "your prompt" -o output.png
When this skill is invoked, locate generate_image.py in the skill directory and run it.
| Parameter | Required | Description |
|---|---|---|
prompt | Yes | Text description of the image to generate or transformation to apply |
-o, --output | Yes | Output filename (you decide the path based on context) |
-i, --image | No | Input image(s) for editing/transformation or as context/reference (can be used multiple times) |
--aspect-ratio | No | One of: 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9 (default: 1:1) |
--size | No | Image size: 1K, 2K, 4K (default: 1K) |
Basic image generation:
uv run generate_image.py "A sunset over mountains" -o sunset.png
Infographic with specific aspect ratio:
uv run generate_image.py "Infographic showing the water cycle with labeled stages" -o water_cycle.png --aspect-ratio 9:16
test cases passed with the skill
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