awesome-copilot/skills/nano-banana-pro-openrouter/SKILL.md

name, description, metadata

name	description	metadata
nano-banana-pro-openrouter	Generate or edit images via OpenRouter using openai-python with the Gemini 3 Pro Image model. Use for prompt-only image generation, image edits, and multi-image compositing; supports 1K/2K/4K output, saves results to the current working directory, and prints MEDIA lines.	emoji requires primaryEnv 🍌 bins env uv OPENROUTER_API_KEY OPENROUTER_API_KEY

Nano Banana Pro OpenRouter

Overview

Generate or edit images with OpenRouter using the google/gemini-3-pro-image-preview model and the openai-python client. Support prompt-only generation, single-image edits, and multi-image composition. Save results to the current working directory and output MEDIA lines for easy attachment.

Prompt-only generation

uv run {baseDir}/scripts/generate_image.py \
  --prompt "A cinematic sunset over snow-capped mountains" \
  --filename sunset.png

Edit a single image

uv run {baseDir}/scripts/generate_image.py \
  --prompt "Replace the sky with a dramatic aurora" \
  --input-image input.jpg \
  --filename aurora.png

Compose multiple images

uv run {baseDir}/scripts/generate_image.py \
  --prompt "Combine the subjects into a single studio portrait" \
  --input-image face1.jpg \
  --input-image face2.jpg \
  --filename composite.png

Resolution

• Use --resolution with 1K, 2K, or 4K.
• Default is 1K if not specified.

System prompt customization

The skill reads an optional system prompt from assets/SYSTEM_TEMPLATE. This allows you to customize the image generation behavior without modifying code.

Behavior and constraints

• Read the API key from OPENROUTER_API_KEY (no CLI flag).
• Accept up to 3 input images via repeated --input-image.
• Save output in the current working directory. If multiple images are returned, append -1, -2, etc.
• Print MEDIA: <path> for each saved image. Do not read images back into the response.