SkillsAdd

github/awesome-copilot · Official

nano-banana-pro-openrouter

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.

All-time #1512 First seen Feb 10, 2026
8-week activity · all time api

Installation

$ npx skills add github/awesome-copilot --skill nano-banana-pro-openrouter
View on skills.sh ↗ GitHub repository ↗

Summary

  • Image generation and editing via OpenRouter's Gemini 3 Pro model with multi-image compositing support.
  • Supports three workflows: prompt-only generation, single-image editing, and multi-image composition (up to 3 images per request) Output resolution options: 1K, 2K, or 4K (defaults to 1K) Customizable behavior through optional system prompt template in assets/SYSTEM_TEMPLATE Requires OPENROUTER_API_KEY environment variable and uv package manager; includes troubleshooting guidance for authentication and dependency issues

Similar popular skills

Related neighbors and high-traction skills in the same topics — useful to compare before installing.

openrouter-typescript-sdk Similar name
openrouterarchived/agent-skills

Complete reference for integrating with 300+ AI models through the OpenRouter TypeScript SDK us…

2K installs
openrouter-models Similar name
openrouterteam/skills

Query OpenRouter for available AI models, pricing, capabilities, throughput, and provider perfo…

8 installs

Also in this package

Other skills from github/awesome-copilot · top by installs.

npx skills add github/awesome-copilot
git-commit 44.5K excalidraw-diagram-generator 29.1K documentation-writer 26.2K multi-stage-dockerfile 23.4K prd 22.9K gh-cli 21.9K refactor 21.6K java-springboot 19.9K create-readme 18.1K playwright-generate-test 18K

Browse all from github/awesome-copilot

More details

Agent compatibility

Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.

Claude Code Not declared
Cursor Not declared
Codex Not declared
GitHub Copilot Declared
Windsurf Not declared
Gemini CLI Not declared
Cline Not declared
OpenCode Not declared

Repository health

Stars 38.8K
License LICENSE
Default branch main
Open issues 21
Status Active

Skill metadata

Parsed from SKILL.md frontmatter.

Declared agents github-copilot
More metadata
emoji
🍌
requires
{"bins":["uv"],"env":["OPENROUTER_API_KEY"]}
primaryEnv
OPENROUTER_API_KEY

Package contents

Files included with this skill beyond the listing page.

  • skill md SKILL.md 2,658 B
  • docs SUMMARY.md 213 B

History

  1. First seen on skills.sh
  2. First recorded snapshot · 9,938 installs

SKILL.md

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
OPENROUTERAPIKEY is not set Ask the user to set it. PowerShell: $env:OPENROUTERAPIKEY = "sk-or-..." / bash: export OPENROUTERAPIKEY="sk-or-..."
uv: command not found or not recognized macOS/Linux: <code>curl -LsSf https://astral.sh/uv/install.sh &#124; sh</code>. Windows: <code>powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 &#124; 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.