Nano Banana 2 Image Generation&Editing

Generate and edit images using Google's Nano Banana 2 (Imagen) model — the latest high-quality image generation AI. Supports text-to-image generation and image editing with up to 14 reference images. Two provider modes: Atlas Cloud and Google AI Studio. Use this skill whenever the user wants to generate images, create AI art, edit photos with AI, do image-to-image transformation, create illustrations, make visual content, or mentions Nano Banana, Imagen, Gemini image, or Google image generation. Also trigger when users ask to create sprites, thumbnails, banners, logos, product photos, concept art, or any visual asset using AI.

MikeWang@xixihhhh

Install

openclaw skills install @xixihhhh/nano-banana-2-skill

Nano Banana 2 Image Generation

Generate and edit images using Google's Nano Banana 2 (Imagen) model via two provider options.

Privacy & data note: This skill sends text prompts and image data to third-party APIs (Atlas Cloud at api.atlascloud.ai or Google AI Studio at generativelanguage.googleapis.com) for image generation. For image editing via Atlas Cloud, local files are uploaded to Atlas Cloud's temporary storage to obtain a URL — the agent MUST ask the user for explicit confirmation before uploading any local file. Uploaded files are temporary and may be cleaned up periodically. No data is stored locally beyond the downloaded output files.

Required Environment Variables

Variable	Required	Description
`ATLASCLOUD_API_KEY`	If using Atlas Cloud	Atlas Cloud API key for image generation
`GEMINI_API_KEY`	If using Google AI Studio	Google AI Studio API key

At least one of the above must be set. If both are set, ask the user which provider to use.

Provider Selection

If ATLASCLOUD_API_KEY is set → use Atlas Cloud
If GEMINI_API_KEY is set → use Google AI Studio
If both are set → ask the user which provider to use
If neither is set → ask the user to configure one:
- Atlas Cloud: Sign up at https://www.atlascloud.ai, Console → API Keys → Create key, then export ATLASCLOUD_API_KEY="your-key"
- Google AI Studio: Get key from https://aistudio.google.com/apikey, then export GEMINI_API_KEY="your-key"

Atlas Cloud

Async API with polling workflow
Flat-rate pricing regardless of resolution
Supports 300+ models through one API key

Google AI Studio

Direct access via Google's Gemini API
Synchronous response with base64 image output

Pricing Comparison

Resolution	Google AI Studio	Atlas Cloud	Savings
1K (default)	$0.080/image	$0.072/image	10% off
2K	$0.080/image	$0.072/image	10% off
4K	$0.080/image	$0.072/image	10% off

Atlas Cloud is 10% cheaper than Google AI Studio across all resolutions, with flat-rate pricing regardless of resolution.

Available Models

Text-to-Image Models

Model ID (Atlas Cloud)	Price	Description
`google/nano-banana-2/text-to-image`	$0.072/image	Stable, production-ready

Image Editing Models

Model ID (Atlas Cloud)	Price	Description
`google/nano-banana-2/edit`	$0.072/image	Stable image editing

Google AI Studio model: gemini-3.1-flash-image-preview (handles both generation and editing)

Mode 1: Atlas Cloud API

Setup

The user needs an Atlas Cloud API key. Guide them to:

Sign up at https://www.atlascloud.ai
Go to Console → API Keys → Create new key
Set environment variable: export ATLASCLOUD_API_KEY="your-key"

Script Usage

This skill includes a Python script for image generation. Zero external dependencies required.

List available image models

bash

python scripts/generate_image.py list-models

Generate an image

bash

python scripts/generate_image.py generate \
  --model "MODEL_ID" \
  --prompt "Your prompt here" \
  --output ./output

Upload a local image (for editing)

bash

python scripts/generate_image.py upload ./local-image.jpg

Edit an image

bash

python scripts/generate_image.py generate \
  --model "MODEL_ID" \
  --prompt "Edit instruction" \
  --image "https://...uploaded-url..."

Run python scripts/generate_image.py generate --help for all options. Extra model params can be passed as key=value (e.g. aspect_ratio=16:9 resolution=2k).

Text-to-Image Generation

Parameters:

Parameter	Type	Required	Default	Options
`prompt`	string	Yes	-	Text description of the image
`aspect_ratio`	string	No	1:1	1:1, 3:2, 2:3, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9
`resolution`	string	No	1k	1k, 2k, 4k
`output_format`	string	No	png	png, jpeg
`seed`	integer	No	random	For reproducible results

Workflow — submit, poll, download:

bash

# Step 1: Submit generation request
curl -s -X POST "https://api.atlascloud.ai/api/v1/model/generateImage" \
  -H "Authorization: Bearer $ATLASCLOUD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/nano-banana-2/text-to-image",
    "prompt": "A serene Japanese garden with cherry blossoms",
    "aspect_ratio": "16:9",
    "resolution": "2k"
  }'
# Response: { "code": 0, "data": { "id": "prediction-id" } }

# Step 2: Poll for result (repeat until status is "completed" or "succeeded")
curl -s "https://api.atlascloud.ai/api/v1/model/prediction/{prediction-id}" \
  -H "Authorization: Bearer $ATLASCLOUD_API_KEY"
# Response when done: { "code": 0, "data": { "status": "completed", "outputs": ["https://...image-url..."] } }

# Step 3: Download the image
curl -o output.png "IMAGE_URL_FROM_OUTPUTS"

When implementing this workflow programmatically:

Poll every 2-3 seconds
Check for status: "completed" or "succeeded" means done
Check for status: "failed" means error — read the error field
Image URLs are in data.outputs[] array

Uploading Local Images

To use local images for editing, first upload them to get a URL. The agent MUST confirm with the user before uploading any local file (e.g., "I'll upload /path/to/image.jpg to Atlas Cloud for editing. Proceed?").

bash

curl -s -X POST "https://api.atlascloud.ai/api/v1/model/uploadMedia" \
  -H "Authorization: Bearer $ATLASCLOUD_API_KEY" \
  -F "file=@/path/to/local/image.jpg"
# Returns: { "code": 200, "data": { "download_url": "https://...url...", "filename": "image.jpg", "size": 123456 } }

Use the returned download_url as the image URL in the images array for editing requests.

Note: Uploaded files are for temporary use with Atlas Cloud generation tasks only. URLs may expire after a period of time.

Image Editing

Same workflow as text-to-image, but with additional images parameter:

Parameter	Type	Required	Default	Options
`prompt`	string	Yes	-	Editing instruction
`images`	array of strings	Yes	-	1-14 image URLs to edit
`aspect_ratio`	string	No	-	Same options as above
`resolution`	string	No	1k	1k, 2k, 4k

bash

curl -s -X POST "https://api.atlascloud.ai/api/v1/model/generateImage" \
  -H "Authorization: Bearer $ATLASCLOUD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/nano-banana-2/edit",
    "prompt": "Change the sky to a dramatic sunset",
    "images": ["https://example.com/photo.jpg"],
    "resolution": "2k"
  }'

Using Atlas Cloud MCP Tools (if available)

If the user has the Atlas Cloud MCP server configured, use the built-in tools directly:

text

# Quick generate
atlas_quick_generate(model_keyword="nano banana 2", type="Image", prompt="...")

# Or with specific model
atlas_generate_image(model="google/nano-banana-2/text-to-image", params={...})

# Check result
atlas_get_prediction(prediction_id="...")

Mode 2: Google AI Studio (Official)

Setup

Get API key from https://aistudio.google.com/apikey
Set environment variable: export GEMINI_API_KEY="your-key"

Text-to-Image Generation

bash

curl -s -X POST \
  "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-image-preview:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [{
      "parts": [{"text": "A serene Japanese garden with cherry blossoms"}]
    }],
    "generationConfig": {
      "responseModalities": ["TEXT", "IMAGE"],
      "imageConfig": {
        "aspectRatio": "16:9",
        "imageSize": "2K"
      }
    }
  }'

Parameters for Google AI Studio:

Parameter	Location	Options
`aspectRatio`	`generationConfig.imageConfig`	1:1, 1:4, 1:8, 2:3, 3:2, 3:4, 4:1, 4:3, 4:5, 5:4, 8:1, 9:16, 16:9, 21:9
`imageSize`	`generationConfig.imageConfig`	512px, 1K, 2K, 4K (uppercase K required)
`responseModalities`	`generationConfig`	["TEXT", "IMAGE"] for image output

Response handling: The response contains base64-encoded image data in candidates[0].content.parts[]. Loop through parts — text parts have .text, image parts have .inline_data.mime_type and .inline_data.data (base64).

Image Editing (Google AI Studio)

Include the source image as base64 inline_data alongside the text prompt:

bash

curl -s -X POST \
  "https://generativelanguage.googleapis.com/v1beta/models/gemini-3.1-flash-image-preview:generateContent" \
  -H "x-goog-api-key: $GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "contents": [{
      "parts": [
        {"text": "Change the sky to a dramatic sunset"},
        {"inline_data": {
          "mime_type": "image/png",
          "data": "BASE64_ENCODED_IMAGE"
        }}
      ]
    }],
    "generationConfig": {
      "responseModalities": ["TEXT", "IMAGE"]
    }
  }'

Python Example (Google AI Studio)

python

from google import genai
from google.genai import types
import base64

client = genai.Client()

# Text-to-Image
response = client.models.generate_content(
    model="gemini-3.1-flash-image-preview",
    contents="A serene Japanese garden with cherry blossoms",
    config=types.GenerateContentConfig(
        response_modalities=['TEXT', 'IMAGE'],
        image_config=types.ImageConfig(
            aspect_ratio="16:9",
            image_size="2K"
        ),
    )
)

for part in response.parts:
    if part.text:
        print(part.text)
    elif image := part.as_image():
        image.save("output.png")

Implementation Guide

When the user asks to generate an image, follow this workflow:

Determine provider: Check which API key is available (see Provider Selection above).
Extract parameters from user request:
- Prompt: the image description
- Aspect ratio: infer from context (banner→16:9, portrait→9:16, square→1:1, phone wallpaper→9:16, desktop wallpaper→16:9)
- Resolution: default 1k unless user wants high quality (then 2k or 4k)
- For editing: identify source image(s)
Choose model (Atlas Cloud only):
- Use google/nano-banana-2/text-to-image for generation
- Use google/nano-banana-2/edit for editing tasks
Execute the API call using bash with curl
For Atlas Cloud: Poll the prediction endpoint every 3 seconds until complete, then download the image
For Google AI Studio: Parse the response, extract base64 image data, save to file
Present the result: Show the saved file path and offer to open it

Prompt Engineering Tips

Share these with users to get better results:

Be specific about style: "oil painting", "photorealistic", "anime style", "watercolor"
Describe lighting: "golden hour", "studio lighting", "neon glow"
Mention composition: "close-up", "wide angle", "bird's eye view"
Include mood: "serene", "dramatic", "whimsical"
For text in images: Nano Banana 2 handles text rendering well — just include the text in quotes in your prompt

Nano Banana 2 Image Generation&Editing

Install

Nano Banana 2 Image Generation

Required Environment Variables

Provider Selection

Pricing Comparison

Available Models

Text-to-Image Models

Image Editing Models

Mode 1: Atlas Cloud API

Setup

Script Usage

List available image models

Generate an image

Upload a local image (for editing)

Edit an image

Text-to-Image Generation

Uploading Local Images

Image Editing

Using Atlas Cloud MCP Tools (if available)

Mode 2: Google AI Studio (Official)

Setup

Text-to-Image Generation

Image Editing (Google AI Studio)

Python Example (Google AI Studio)

Implementation Guide

Prompt Engineering Tips

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