nano-banana
GitHub通过 Nano Banana 模型生成或编辑图像，支持单图生成、编辑及多图合成，自动处理图片压缩与格式，并输出特定媒体行以在聊天中发送图片。
Trigger Scenarios
Install
npx skills add nexu-io/nexu --skill nano-banana -g -y
SKILL.md
Frontmatter
{
"name": "nano-banana",
"homepage": "https:\/\/ai.google.dev\/",
"metadata": {
"openclaw": {
"emoji": "🍌",
"requires": {
"bins": [
"node"
]
}
}
},
"description": "Generate or edit images via Nano Banana image models. Triggers on \"generate image\", \"image generation\", \"nano banana\", \"edit image\", \"nano banana pro\", \"nano banana 2\""
}
Nano Banana — Image Generation
Image generation script supporting three models. Requires sharp for input image compression (auto-installed on first run).
Models
| Flag | Notes |
|---|---|
--model nano-banana |
Default. Fast, good quality. |
--model nano-banana-pro |
Highest quality, slower. |
--model nano-banana-2 |
Legacy model. |
Generate an image
node {baseDir}/scripts/generate-image.js --prompt "a cat sitting on mars" --filename "cat-on-mars.png"
Edit a single image
node {baseDir}/scripts/generate-image.js \
--prompt "make the sky purple" \
--filename "edited.png" \
-i "/path/to/input.png" \
--model nano-banana-pro
Multi-image composition (up to 14 images)
node {baseDir}/scripts/generate-image.js \
--prompt "combine these into a collage" \
--filename "collage.png" \
-i img1.png -i img2.png -i img3.png
Options
| Flag | Short | Default | Description |
|---|---|---|---|
--prompt |
-p |
required | Image description or editing instruction |
--filename |
-f |
required | Output filename |
--input-image |
-i |
— | Input image(s), repeatable, max 14 |
--model |
— | nano-banana |
nano-banana, nano-banana-pro, or nano-banana-2 |
--resolution |
-r |
1K |
1K, 2K, or 4K |
--aspect-ratio |
— | — | e.g. 1:1, 16:9, 4:3, 3:4, 9:16 |
API key
The API key is pre-configured on this machine. No flags or environment variables needed.
Input image handling
All input images are sent as inline base64. Images over 500 KB are automatically compressed to JPEG and resized to fit under the limit. This keeps requests fast and avoids File API auth issues with the enterprise endpoint.
Output
Relative filenames are saved to $OPENCLAW_STATE_DIR/media/outbound/{slugid}/nano-banana/{filename}. Absolute paths are used as-is. Absolute paths are used as-is. Use timestamps in filenames to avoid overwrites: cat-on-mars-20260304-165000.png.
Sending images to the user
The script prints a MEDIA: <absolute-path> line on stdout. You MUST include this exact MEDIA: line in your reply text so the image is delivered as an attachment in Discord/Slack/chat.
Example reply:
Here's your image!
MEDIA: /Users/alche/.openclaw/media/outbound/my-bot/nano-banana/cat-on-mars.png
Rules:
- Copy the
MEDIA:line from the script output into your reply verbatim — this is how images get sent - Do NOT read the generated image back with the read tool
- Do NOT try to base64 encode or manually attach the image
- The
MEDIA:line must be on its own line in your response
Version History
- dadfb1c Current 2026-07-25 09:21
