Nano Banana Imagegen

What it does

When your agent uses it

• The user asks to create
• Edit images with AI
• Requests like create an image
• Generate a picture

Example prompts

• “create an image”
• “generate a picture”
• “make me a logo”
• “/nano-banana-imagegen”

Requirements

• Node.js
• A credential in GEMINI_API_KEY
• A credential in OPENROUTER_API_KEY

Workflow steps

4 steps, taken from the step headings in SKILL.md.

1. 1Understand the Request
2. 2Craft an Effective Prompt
3. 3Generate the Image
4. 4Iterate

What it can do on your machine

Read from SKILL.md and the folder at commit 7a2d171. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • npx

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use npx, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • GEMINI_API_KEY
  • OPENROUTER_API_KEY

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Nano Banana Imagegen loads about 1.6k tokens when it runs, and up to ~7.4k if it reads all its reference files. Until then it costs about 97 tokens; SKILL.md has 619 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~97

When it runs · the whole SKILL.md, loaded when a task matches

~1.6k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~7.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

• NoteMentions a .env fileSKILL.md:14

  set via the environment or a gitignored `.env` in the project

• NoteMentions a .env fileSKILL.md:166

  Or create a `.env` file in your project:

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from BlackBeltTechnology/pi-agent-dashboard at commit 7a2d171, republished under its MIT licence (© BlackBeltTechnology). 619 words, ~1,644 tokens.

name

nano-banana-imagegen

description

Generate and edit images using Google Gemini image models via the nano-banana CLI. Use when the user asks to create, generate, make, or edit images with AI. Supports text-to-image, image editing, style transfer, and multi-image composition. Trigger on requests like "create an image", "generate a picture", "make me a logo", "edit this photo", "add X to this image".

# Generate a new image
pi-nano-banana "a serene mountain landscape at sunset"

# Edit an existing image
pi-nano-banana "add a hot air balloon to the sky" --file photo.jpg

# Specify output path
pi-nano-banana "a minimalist logo" --output logo.png

# Use a specific model / faster flash model
pi-nano-banana "detailed illustration" --model gemini-2.0-flash-exp
pi-nano-banana "a quick sketch" --flash

"a cat"

"A fluffy orange tabby cat curled up on a velvet armchair, soft afternoon sunlight streaming through a window, warm cozy interior, photorealistic style, shallow depth of field"

npx @the-focus-ai/nano-banana "your detailed prompt here"

npx @the-focus-ai/nano-banana "<prompt>"

npx @the-focus-ai/nano-banana "<edit instruction>" --file <input-image>

pi-nano-banana "a red fox in the snow, watercolor" -o fox.png --backend pi
pi-nano-banana "make it night" --file fox.png -o fox-night.png --backend pi

export GEMINI_API_KEY="your-api-key-here"

GEMINI_API_KEY=your-api-key-here

© BlackBeltTechnology, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 6 other files (references) in packages/nano-banana/.pi/skills/nano-banana-imagegen of BlackBeltTechnology/pi-agent-dashboard.

• SKILL.md
• references/headers-and-heroes.md
• references/icons-and-logos.md
• references/illustrations.md
• references/photography-and-editing.md
• references/prompting-guide.agent.md
• references/prompting-guide.md

Open the folder on GitHubat commit 7a2d171