nano-banana-use

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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.

1installs

Sourcecnemri/google-genai-skills

Added on2026-02-07

NPX Install

npx skill4agent add cnemri/google-genai-skills nano-banana-use

SKILL.md Content

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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:

API Key:
- ```
GOOGLE_API_KEY
```
  or
```
GEMINI_API_KEY
```

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

:

bash

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

Edit an Image

Modify an existing image based on a text prompt.

bash

uv run skills/nano-banana-use/scripts/edit_image.py original.png "Make the sky purple" --output edited.png

Compose Images

Generate a new image based on multiple input images and a prompt.

bash

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

Options

```
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

.

nano-banana-use

NPX Install

Tags

SKILL.md Content

Nano Banana Use

Prerequisites

Usage

Generate an Image

Edit an Image

Compose Images

Options