imagegen-marketplace

imagegen - Claude Code Plugin

Generate and edit images directly from Claude Code using OpenAI's image models (GPT-Image-1, DALL-E 2, DALL-E 3). Powered by imagegen-mcp.

Prerequisites

• Claude Code installed
• Node.js v18+ (for npx)
• An OpenAI API key with image generation access

Installation

Option 1: Install from This Marketplace (Recommended)

This repository serves as its own plugin marketplace. Add it to Claude Code, then install the plugin:

Step 1: Add the marketplace

Run Claude Code and use the /plugins command, then select Manage marketplaces and add this repository:

thorrak/imagegen-plugin

Step 2: Install the plugin

Once the marketplace is added, install the plugin:

/plugins install imagegen@imagegen-marketplace

Or browse interactively via /plugins > Discover.

Option 2: Local Installation (Development)

Clone the repository and point Claude Code to it directly:

git clone https://github.com/thorrak/imagegen-plugin.git
claude --plugin-dir /path/to/imagegen-plugin

Setup

Set your OpenAI API key as an environment variable:

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

Add this to your shell profile (~/.bashrc, ~/.zshrc, etc.) to persist across sessions. The plugin's MCP server reads this variable automatically on startup.

Usage

Slash Commands

Generate an image from a text prompt:

/generate-image a minimalist weather app icon, flat design, blue gradient
/generate-image --model dall-e-3 --size 1792x1024 a panoramic mountain landscape
/generate-image --transparent a coffee shop logo, simple vector style

Edit an existing image:

/edit-image ./assets/logo.png change the background color to navy blue
/edit-image ./photo.png --mask ./mask.png replace the sky with a starry night

Natural Language

You can also ask Claude conversationally — the plugin's skill activates automatically:

• "Generate an icon for my app"
• "Create a hero banner for the landing page"
• "Edit the logo to make the text larger"
• "Make a transparent PNG version of this image"

Command Flags

Both commands support optional flags:

Flag	Values	Default	Notes
--model	gpt-image-1, dall-e-2, dall-e-3	gpt-image-1
--size	e.g. 1024x1024, 1792x1024	1024x1024	Valid sizes vary by model
--format	png, jpeg, webp	png
--quality	auto, standard, hd	auto	hd is DALL-E 3 only
--transparent	(flag, no value)	off	GPT-Image-1 + PNG/WebP only
--n	number	1	DALL-E 3 limited to 1

Available Models

Model	Best For	Editing	Transparent BG	Sizes
gpt-image-1	General use, highest quality	Yes	Yes	1024x1024, 1536x1024, 1024x1536
dall-e-3	Artistic/creative images	No	No	1024x1024, 1792x1024, 1024x1792
dall-e-2	Quick drafts, low cost	Yes	No	256x256, 512x512, 1024x1024

Output

Generated images are saved to ./generated-images/ in your project directory with descriptive filenames (e.g., weather-app-icon.png, hero-banner.png).

Plugin Components

Component	Description
MCP Server	Auto-starts imagegen-mcp via npx — connects to OpenAI's image APIs
Skill	Activates automatically when you discuss image generation — guides model selection, parameters, and prompting
Commands	/generate-image and /edit-image for quick, flag-based access

Troubleshooting

MCP server fails to start:

• Verify OPENAI_API_KEY is set: echo $OPENAI_API_KEY
• Verify Node.js is installed: node --version (v18+ required)
• Check that npx works: npx --version

Image generation fails:

• Check your OpenAI API key has image generation permissions
• Verify the requested size is valid for the chosen model (see table above)
• If you get a content policy error, try rephrasing your prompt

Plugin not loading:

• Run /plugins in Claude Code and verify imagegen is listed and enabled
• Restart Claude Code after installing the plugin

Credits

Built on imagegen-mcp by spartanz51.