# Cnemri Google Genai Skills Nano Banana Use

> Nano Banana Use

- Skill: `tomevault-io/cnemri-google-genai-skills-nano-banana-use` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/cnemri-google-genai-skills-nano-banana-use`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/cnemri-google-genai-skills-nano-banana-use/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/cnemri-google-genai-skills-nano-banana-use

---


# 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`:

```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`.

---
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<!-- tomevault:4.0:skill_md:2026-04-11 -->