Skill

nano-banana-pro-openrouter

Generate or edit images via OpenRouter's Gemini 3 Pro model using CLI script. Handles prompt-only generation, single-image edits, multi-image compositing; supports 1K/2K/4K resolutions.

Python

ai-ml

From awesome-copilot

Install

Run in your terminal

npx claudepluginhub ctr26/dotfiles --plugin awesome-copilot

Tool Access

This skill uses the workspace's default tool permissions.

Supporting Assets

View in Repository

assets/SYSTEM_TEMPLATE

scripts/generate_image.py

Skill Content

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Stats

Stars28207

Forks3270

Last CommitFeb 10, 2026

Actions

View Source View Plugin View on GitHub View README

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: <code>curl -LsSf https://astral.sh/uv/install.sh \| sh</code>. Windows: <code>powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 \| iex"</code>. 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.