kkoppenhaver

Nano Banana Image Generation — Development skill for Claude Code

Development community intermediate

Generate professional images via the Gemini CLI's nanobanana extension.

How to install Nano Banana Image Generation

This entry records only its repository, not the path inside it, so there is no exact command to give. Open kkoppenhaver/cc-nano-banana and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Nano Banana Image Generation does

Generate professional images via the Gemini CLI's nanobanana extension.

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README

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:*)

Nano Banana Image Generation

Generate professional images via the Gemini CLI's nanobanana extension.

When to Use This Skill

ALWAYS use this skill when the user:

Asks for any image, graphic, illustration, or visual
Wants a thumbnail, featured image, or banner
Requests icons, diagrams, or patterns
Asks to edit, modify, or restore a photo
Uses words like: generate, create, make, draw, design, visualize

Do NOT attempt to generate images through any other method.

Before First Use

Verify extension is installed:

gemini extensions list | grep nanobanana

If missing, install it:

gemini extensions install https://github.com/gemini-cli-extensions/nanobanana

Verify API key is set:

[ -n "$GEMINI_API_KEY" ] && echo "API key configured" || echo "Missing GEMINI_API_KEY"

Command Selection

User Request	Command
"make me a blog header"	`/generate`
"create an app icon"	`/icon`
"draw a flowchart of..."	`/diagram`
"fix this old photo"	`/restore`
"remove the background"	`/edit`
"create a repeating texture"	`/pattern`
"make a comic strip"	`/story`

Available Commands

**Note:** Always use the `--yolo` flag to automatically approve all tool actions.

Command	Use Case
`gemini --yolo "/generate 'prompt'"`	Text-to-image generation
`gemini --yolo "/edit file.png 'instruction'"`	Modify existing image
`gemini --yolo "/restore old_photo.jpg 'fix scratches'"`	Repair damaged photos
`gemini --yolo "/icon 'description'"`	App icons, favicons, UI elements
`gemini --yolo "/diagram 'description'"`	Flowcharts, architecture diagrams
`gemini --yolo "/pattern 'description'"`	Seamless textures and patterns
`gemini --yolo "/story 'description'"`	Sequential/narrative images
`gemini --yolo "/nanobanana prompt"`	Natural language interface

Common Options

--yolo - Required. Auto-approve all tool actions (no confirmation prompts)
--count=N - Generate N variations (1-8)
--preview - Auto-open generated images
--styles="style1,style2" - Apply artistic styles
--format=grid|separate - Output arrangement

Common Sizes

Use Case	Dimensions	Notes
YouTube thumbnail	1280x720	`--aspect=16:9`
Blog featured image	1200x630	Social preview friendly
Square social	1080x1080	Instagram, LinkedIn
Twitter/X header	1500x500	Wide banner
Vertic