Nano Banana

What it does

When your agent uses it

• The user asks to create
• Tasks that involve Image generation
• Tasks that involve Diagrams

Example prompts

• “/nano-banana”

Requirements

• A credential in GEMINI_API_KEY
• Pre-approved tools (allowed-tools): Bash(gemini:*)

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

1. 1Verify extension is installed
2. 2If missing, install it
3. 3Verify API key is set

What it can do on your machine

Read from SKILL.md and the folder at commit 3b13699. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Bash(gemini:*)

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • gemini

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

• Network

  Hosts in commands or code, which the agent is likely to contact:

  • github.com

  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

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

Context cost

Nano Banana loads about 1.4k tokens when it runs. Until then it costs about 93 tokens; SKILL.md has 462 words of instructions outside code blocks.

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

~93

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

~1.4k

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

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 kkoppenhaver/cc-nano-banana at commit 3b13699, republished under its MIT licence (© kkoppenhaver). 462 words, ~1,387 tokens.

name

nano-banana

description

REQUIRED for all image generation requests. Generate and edit images using Nano Banana (Gemini CLI). Handles blog featured images, YouTube thumbnails, icons, diagrams, patterns, illustrations, photos, visual assets, graphics, artwork, pictures. Use this skill whenever the user asks to create, generate, make, draw, design, or edit any image or visual content.

allowed-tools

Bash(gemini:*)

export NANOBANANA_MODEL=gemini-3-pro-image-preview

# Modern illustration style
gemini --yolo "/generate 'modern flat illustration of developer coding at laptop, purple and blue gradient background, minimalist style, no text' --preview"

# Professional photography style
gemini --yolo "/generate 'professional editorial photo of coffee cup next to laptop on wooden desk, morning sunlight, shallow depth of field, no text' --count=3"

# Tech/abstract
gemini --yolo "/generate 'abstract visualization of neural network connections, dark background with glowing blue nodes, futuristic style' --preview"

gemini --yolo "/icon 'minimalist app logo for productivity tool' --sizes='64,128,256,512' --type='app-icon' --corners='rounded'"

gemini --yolo "/diagram 'user authentication flow with OAuth' --type='flowchart' --style='modern'"

© kkoppenhaver, 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 2 other files in the repository root of kkoppenhaver/cc-nano-banana.

• SKILL.md
• LICENSE
• README.md

Open the folder on GitHubat commit 3b13699

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in kkoppenhaver/cc-nano-banana, which our catalogue first saw on October 7, 2026.

• nicepkg/ai-workflowworkflows/content-creator-workflow/.claude/skills/nano-banana