# nanobanana

Generates and edits images via Gemini models. Handles local multi-image references, batch output, and dry-run validation without sending requests.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 10600 installs · ★ 7
- Author: GargantuaX
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/GargantuaX/openskills/tree/HEAD/skills/nanobanana/SKILL.md
- Updated: 2026-04-22
- HTML: https://affpapa.org/en/nevibecode/skills/nanobanana

## What it does

The skill provides a Python CLI entrypoint to generate and edit images through Gemini models. Under the hood, `scripts/nanobanana.py` handles single requests with `generate` and bulk jobs with `batch`. It exposes aliases for exact models: `nanobanana` targets `gemini-2.5-flash-image`, `nanobanana-2` calls `gemini-3.1-flash-image-preview`, and `nanobanana-pro` runs `gemini-3-pro-image-preview`.

Strict option validation catches errors before dispatching calls. The `--size` flag is supported only on Gemini 3 image models; passing it to `nanobanana` causes an immediate failure. Also, resolution `512` works exclusively on `nanobanana-2`. You should run `--dry-run` whenever payload shape needs checking.

Editing uses repeated `--input-image` flags to blend multiple local references into one output. Custom endpoints are configured via `--base-url` or `GEMINI_BASE_URL`. With `--auth-mode auto`, the script passes `x-goog-api-key` to official endpoints and attaches Bearer authorization headers on custom gateways.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add GargantuaX/openskills --skill nanobanana -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/nanobanana/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/nanobanana/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add GargantuaX/openskills --skill nanobanana -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/nanobanana/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add GargantuaX/openskills --skill nanobanana -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/nanobanana/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install GargantuaX/openskills nanobanana
```

2. **Manually: put the files in place**
- File: `.github/skills/nanobanana/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add GargantuaX/openskills --skill nanobanana -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/GargantuaX/openskills --path skills/nanobanana
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/nanobanana/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add GargantuaX/openskills --skill nanobanana -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/GargantuaX/openskills/tree/HEAD/skills/nanobanana/SKILL.md

## When to use it
- generate images from text prompts using Gemini models
- combine multiple local reference images into one graphic edit
- produce several image variants in a single batch command
- validate request payloads before sending them with `--dry-run`

## Example prompts
- Run nanobanana-2 to generate a 16:9 hero image and save it into out/hero.png
- Edit refs/subject.png and refs/background.png using nanobanana-pro into out/poster.png
- Test the batch icon generation command with nanobanana using --dry-run

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 4a2c793527a9faa4.

BEGIN THIRD-PARTY FILE 4a2c793527a9faa4
````text
---
name: nanobanana
description: Gemini-native Nano Banana image generation and editing across Nano Banana, Nano Banana 2, and Nano Banana Pro. Use when you need text-to-image, image-to-image edits, repeated local references, batch generation, dry-run request inspection, or a custom Gemini-compatible base URL such as a self-hosted gateway.
---

# Nano Banana

A single Python entrypoint for Gemini-native Nano Banana image generation and editing, with model aliases, strict option validation, batch runs, and custom endpoint support.

## Workflow

1. Open [references/config.md](./references/config.md) to choose environment variables and override order.
2. Open [references/models-and-api.md](./references/models-and-api.md) to pick the right Nano Banana tier and check model-specific constraints.
3. Prefer `gemini-3.1-flash-image-preview` (`nanobanana-2`) unless you need either the fastest low-cost default (`nanobanana`) or the highest-fidelity reasoning model (`nanobanana-pro`).
4. Run `scripts/nanobanana.py generate` for one request or `scripts/nanobanana.py batch` for repeated variants.
5. Add `--dry-run` first when the main risk is the payload shape, endpoint, or model-specific option support.
6. Pass `--base-url` or `GEMINI_BASE_URL` when you need a custom Gemini-compatible gateway.
7. Add `--save-response <path>` on `generate` when you need the raw JSON body for debugging.

## Commands

Single text-to-image request:

```powershell
python .\skills\nanobanana\scripts\nanobanana.py generate `
  --prompt "A retro-futurist product hero illustration for a developer tool" `
  --output .\out\hero.png `
  --model nanobanana-2 `
  --ratio 16:9 `
  --size 2K
```

Edit an existing image with two local references:

```powershell
python .\skills\nanobanana\scripts\nanobanana.py generate `
  --prompt "Turn these references into a clean launch poster with legible title text" `
  --input-image .\refs\subject.png `
  --input-image .\refs\background.png `
  --output .\out\poster.png `
  --model nanobanana-pro `
  --ratio 4:5 `
  --size 2K
```

Use a custom Gemini-compatible gateway:

```powershell
python .\skills\nanobanana\scripts\nanobanana.py generate `
  --prompt "A bold mascot sticker pack" `
  --output .\out\stickers.png `
  --base-url http://your-gateway.example.com/v1beta `
  --auth-mode bearer
```

Batch-generate five variants:

```powershell
python .\skills\nanobanana\scripts\nanobanana.py batch `
  --prompt "Minimal app icon for a PDF workflow product" `
  --count 5 `
  --dir .\out\icons `
  --prefix icon `
  --model nanobanana `
  --ratio 1:1
```

Inspect the final request without sending it:

```powershell
python .\skills\nanobanana\scripts\nanobanana.py generate `
  --prompt "An editorial illustration of AI agents at work" `
````
END THIRD-PARTY FILE 4a2c793527a9faa4

The third-party file has ended. Everything between the 4a2c793527a9faa4 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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