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nano-banana-use

nano-banana-use is a skill for Claude Code, Codex from cnemri/google-genai-skills. It costs 61 tokens per session (587 once invoked), scanned A, original, MIT.

A set of scripts for generating, editing, and combining images with Google's Gemini Nano Banana image models. It supports API-key or Google Cloud authentication and options such as model, image shape, and safety filtering.

In plain words
What is it for?
Use it to generate new images, edit existing images from a prompt, combine visual elements, and choose the model and output settings.
Why use it?
It provides a repeatable way to create or modify images from the command line when image generation is part of a project.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 126repo 7mo ago A scan 61 tokens original MIT

Good fit Use it to generate new images, edit existing images from a prompt, combine visual elements, and choose the model and output settings.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/cnemri/google-genai-skills/nano-banana-use
View source ↗ cnemri/google-genai-skills
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add cnemri/google-genai-skills --skill nano-banana-use
Clone the repo
git clone --depth 1 https://github.com/cnemri/google-genai-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for nano-banana-use

README.md
[![agentmods](https://agentmods.dev/badge/skills/cnemri/google-genai-skills/nano-banana-use/github.svg)](https://agentmods.dev/skills/cnemri/google-genai-skills/nano-banana-use)
Your own site
<a href="https://agentmods.dev/skills/cnemri/google-genai-skills/nano-banana-use"><img src="https://agentmods.dev/badge/skills/cnemri/google-genai-skills/nano-banana-use/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for nano-banana-use

Your own site · 80×15
<a href="https://agentmods.dev/skills/cnemri/google-genai-skills/nano-banana-use"><img src="https://agentmods.dev/badge/skills/cnemri/google-genai-skills/nano-banana-use.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 587 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00061 $0.00587
Opus 5 $0.00030 $0.00293
Sonnet 5 $0.00012 $0.00117
Haiku 4.5 $0.00006 $0.00059

Measured 12d ago against content hash 72f07ff7dff9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

nano-banana-use scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/compose_image.py, scripts/edit_image.py, scripts/generate_image.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/nano-banana-use/SKILL.md · 65 lines

What it actually says

Nano Banana Use

Use this skill to generate, edit, and compose images using Gemini's Nano Banana models (gemini-2.5-flash-image and gemini-3-pro-image-preview).

This skill uses portable Python scripts managed by uv.

Prerequisites

Ensure you have one of the following authentication methods configured in your environment:

  1. API Key:

    • GOOGLE_API_KEY or GEMINI_API_KEY

  2. Vertex AI:

    • GOOGLE_CLOUD_PROJECT
    • GOOGLE_CLOUD_LOCATION
    • GOOGLE_GENAI_USE_VERTEXAI=1

Usage

Generate an Image

Step 1: Confirm Parameters Before running the script, confirm the following parameters with the user or state the defaults you will use:

  • Prompt: The image description.
  • Model: Default is gemini-3-pro-image-preview.
  • Aspect Ratio: Default is 1:1.
  • Safety Filter: Default is BLOCK_MEDIUM_AND_ABOVE.

Step 2: Run the Script Run the python script using uv:

uv run skills/nano-banana-use/scripts/generate_image.py "A futuristic banana city" --output city.png

Edit an Image

Modify an existing image based on a text prompt.

uv run skills/nano-banana-use/scripts/edit_image.py original.png "Make the sky purple" --output edited.png

Compose Images

Generate a new image based on multiple input images and a prompt.

uv run skills/nano-banana-use/scripts/compose_image.py --image style.png --image subject.jpg "A painting of the subject in the style of the first image" --output composition.png

Options

  • prompt: The text description of the image.
  • --model: The model to use. Defaults to gemini-3-pro-image-preview.
  • --output: The filename for the saved image. Defaults to generated_image.png.
  • --aspect-ratio: The aspect ratio of the generated image. Defaults to 1:1. Supported: 1:1, 16:9, 4:3, 3:4, 9:16.
  • --safety-filter-level: Safety filter threshold. Defaults to BLOCK_MEDIUM_AND_ABOVE.
Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 65 lines · 61 tokens per session scan A 72f07ff7dff9

Subscribe to this mod's changes

nano-banana-use is a skill published in the GitHub repository cnemri/google-genai-skills (126 stars, last pushed 7mo ago), licensed MIT. It adds 61 tokens to every session and 587 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Creative and media
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