// Generate and edit images using Google's Nano Banana 2 (Gemini 3.1 Flash Image Preview) API. This skill should be used when the user asks to create or modify images, especially when they need fast iteration, explicit aspect-ratio control, or resolution control from 512px to 4K.
| name | nano-banana-2 |
| description | Generate and edit images using Google's Nano Banana 2 (Gemini 3.1 Flash Image Preview) API. This skill should be used when the user asks to create or modify images, especially when they need fast iteration, explicit aspect-ratio control, or resolution control from 512px to 4K. |
Generate new images or edit existing images with Nano Banana 2 (gemini-3.1-flash-image-preview).
Run the script using absolute or workspace-relative path (do NOT cd into the skill directory first):
Generate new image:
uv run ./.agents/skills/nano-banana-2/scripts/generate_image.py --prompt "your image description" --filename "output-name.png" [--resolution 512px|1K|2K|4K] [--aspect-ratio RATIO] [--api-key KEY]
Edit image(s) with references:
uv run ./.agents/skills/nano-banana-2/scripts/generate_image.py --prompt "editing instructions" --filename "output-name.png" --input-image "path/to/input1.png" [--input-image "path/to/input2.png" ...] [--resolution 512px|1K|2K|4K] [--aspect-ratio RATIO] [--api-key KEY]
Always run from the user's current working directory so outputs are saved in the active project context.
Use model code:
gemini-3.1-flash-image-preview (Nano Banana 2)Do not use gemini-3-pro-image-preview in this skill.
Nano Banana 2 supports:
512px (fastest, low-latency iteration)1K (default)2K4KMap common user language:
512px1K2K4KUse uppercase K for 1K, 2K, 4K.
Supported aspect ratios:
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, 21:9Map common requests:
1:19:1616:921:92:3 or 3:44:1 or 8:1If unspecified, let the model default behavior apply.
Provide up to 14 reference images when needed by repeating --input-image:
Use one image for simple edits; use multiple images for composition or consistency-sensitive tasks.
Resolve API key in this order:
--api-key argumentGEMINI_API_KEY environment variableIf no key is available, stop and report a clear error.
Generate filenames as: yyyy-mm-dd-hh-mm-ss-name.png
Examples:
2026-02-26-17-31-04-japanese-garden.png2026-02-26-17-31-59-social-banner.pngFor generation, pass the user's request as-is unless critically underspecified. For editing, include explicit transformation instructions in the prompt and preserve the original intent.
--filename)Create a 4K widescreen image:
uv run ./.agents/skills/nano-banana-2/scripts/generate_image.py --prompt "Futuristic city skyline at blue hour with neon reflections" --filename "2026-02-26-17-45-00-futuristic-skyline.png" --resolution 4K --aspect-ratio 16:9
Edit with multiple references:
uv run ./.agents/skills/nano-banana-2/scripts/generate_image.py --prompt "Create a polished campaign image that keeps the exact logo details and character identity" --filename "2026-02-26-17-50-10-campaign-image.png" --input-image "logo.png" --input-image "character.png" --resolution 2K --aspect-ratio 4:5
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This skill helps with GitHub Copilot SDK work across Node.js/TypeScript, Python, Go, .NET, and Java. It covers setup, authentication, permissions, streaming events, custom tools, custom agents, MCP servers, hooks, skills, and session persistence.
Generate and edit images using Google's Nano Banana 2 (Gemini 3.1 Flash Image Preview) API. This skill should be used when the user asks to create or modify images, especially when they need fast iteration, explicit aspect-ratio control, or resolution control from 512px to 4K.
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