An image-generation and editing tool that uses Google's Gemini image models to create pictures, graphics, and images containing text. It can also modify existing photos or other images.

Use it to create illustrations, logos, diagrams, visual variations, edited photos, or images with consistent characters and readable text.

It provides a way to produce visual content from descriptions or edit supplied images, with setup guidance for connecting the required Gemini service.

nano-banana — Skill for Claude Code by ckorhonen

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 ckorhonen/claude-skills --skill nano-banana

Clone the repo

git clone --depth 1 https://github.com/ckorhonen/claude-skills

Made for: Claude Code.

Or install claude-skills, the plugin that ships this one along with the rest of its 62 skills, 4 commands, 7 agents.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ckorhonen/claude-skills/nano-banana/github.svg)](https://agentmods.dev/skills/ckorhonen/claude-skills/nano-banana)

Your own site

<a href="https://agentmods.dev/skills/ckorhonen/claude-skills/nano-banana"><img src="https://agentmods.dev/badge/skills/ckorhonen/claude-skills/nano-banana/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/ckorhonen/claude-skills/nano-banana"><img src="https://agentmods.dev/badge/skills/ckorhonen/claude-skills/nano-banana.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 78 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,370 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. 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.

Model	Per session	Once invoked
Fable 5.1	$0.00078	$0.02370
Opus 5	$0.00039	$0.01185
Sonnet 5	$0.00016	$0.00474
Haiku 4.5	$0.00008	$0.00237

Measured 12d ago against content hash d9ac41b1dbcc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade B, and why

nano-banana scanned grade B with 1 finding 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.

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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

Or add to `~/.claude/settings.json` manually:

skills/nano-banana/SKILL.md · 279 lines

How it starts

The opening of the file, as written. The whole thing — 279 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Nano Banana - AI Image Generation via MCP

Generate stunning 4K images, edit photos, and create graphics with perfect text rendering using Google's Gemini image models via MCP. The default model is gemini-3.1-flash-image-preview (Nano Banana 2), launched February 2026.

When to Use

Invoke when user:

Asks to "generate an image" or "create a picture"
Wants to "edit this photo" or "modify this image"
Needs graphics with text (logos, infographics, diagrams)
Requests "consistent characters" across multiple images
Says "visualize this" or "make me a [visual thing]"

Prerequisites

1. Gemini API Key

Get a free API key from Google AI Studio:

Sign in with Google account
Click "Get API Key" → "Create API Key"
Copy and save securely

2. MCP Server Setup

Recommended: NanoBanana-MCP (uses Gemini 3.1 Flash Image for highest quality)

# Quick install via Claude Code CLI
claude mcp add nano-banana --env GEMINI_API_KEY=your-key-here -- npx -y nanobanana-mcp

Or add to ~/.claude/settings.json manually:

{
  "mcpServers": {
    "nano-banana": {
      "command": "npx",
      "args": ["-y", "nanobanana-mcp"],
      "env": {
        "GEMINI_API_KEY": "your-api-key-here"
      }
    }
  }
}

Alternative: Nano-Banana-MCP by ConechoAI (Gemini 2.0 Flash - faster, lower cost)

{
  "mcpServers": {
    "nano-banana": {
      "command": "npx",
      "args": ["nano-banana-mcp"],
      "env": {
        "GEMINI_API_KEY": "your-api-key-here"
      }
    }
  }
}

Available Tools

Once MCP is configured, these tools become available:

Core Tools

Tool	Purpose	Key Parameters
`gemini_generate_image`	Create new images from text prompts	`prompt`, `model`, `aspectRatio`, `imageSize`
`gemini_edit_image`	Modify existing images with instructions	`imagePath`, `instructions`, `model`
`continue_editing`	Refine the last generated image	`instructions`
`get_image_history`	List all generated images in session	-

Read the full file on GitHub · 279 lines

Files

What ships with it

9 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.

12d ago First seen · 279 lines · 78 tokens per session scan B d9ac41b1dbcc

Subscribe to this mod's changes

nano-banana is a skill published in the GitHub repository ckorhonen/claude-skills (14 stars, last pushed 2mo ago), licensed MIT. It adds 78 tokens to every session and 2,370 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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