nano-banana-pro-openrouter

name nano-banana-pro-openrouter description Generate or edit images via OpenRouter with the Gemini 3 Pro Image model. Use for prompt-only image generation, image edits, and multi-image compositing; supports 1K/2K/4K output. metadata {"emoji":"🍌","requires":{"bins":["uv"],"env":["OPENROUTER_API_KEY"]},"primaryEnv":"OPENROUTER_API_KEY"} Nano Banana Pro OpenRouter Overview Generate or edit images with OpenRouter using the google/gemini-3-pro-image-preview model. Support prompt-only generation, single-image edits, and multi-image composition. 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 Accept up to 3 input images via repeated --input-image . --filename accepts relative paths (saves to current directory) or absolute paths. If multiple images are returned, append -1 , -2 , etc. to the filename. Print MEDIA: <path> for each saved image. Do not read images back into the response. Troubleshooting If the script exits non-zero, check stderr against these common blockers: Symptom Resolution OPENROUTER_API_KEY is not set Ask the user to set it. PowerShell: $env:OPENROUTER_API_KEY = "sk-or-..." / bash: export OPENROUTER_API_KEY="sk-or-..." uv: command not found or not recognized macOS/Linux: curl -LsSf https://astral.sh/uv/install.sh | sh . Windows: powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex" . Then restart the terminal. AuthenticationError / HTTP 401 Key is invalid or has no credits. Verify at https://openrouter.ai/settings/keys . For transient errors (HTTP 429, network timeouts), retry once after 30 seconds. Do not retry the same error more than twice — surface the issue to the user instead.