Agent-Skills.md

Agent Skills: Image Generation Skill

AI image generation using Google Gemini (Gemini) and OpenAI GPT-Image. Generate, edit, iterate, and create assets.

UncategorizedID: thrownlemon/claude-code-plugins/imagegen

Repository

thrownlemon/claude-code-plugins
ThrownLemonLicense: MIT
1

Install this agent skill to your local

pnpm dlx add-skill https://github.com/ThrownLemon/claude-code-plugins/tree/HEAD/plugins/imagegen/skills/imagegen

Skill Files

Browse the full folder contents for imagegen.

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plugins/imagegen/skills/imagegen/SKILL.md

Skill Metadata

Name
imagegen
Description
AI image generation using Google Gemini (Gemini) and OpenAI GPT-Image. Generate, edit, iterate, and create assets.

Image Generation Skill

This skill enables AI-powered image generation, editing, and asset creation using Google Gemini (Gemini) and OpenAI GPT-Image.

When to Use

Activate this skill when the user wants to:

  • Generate images from text descriptions
  • Edit or modify existing images
  • Create project assets (icons, favicons, social images)
  • Generate design inspiration (moodboards)
  • Create consistent character designs
  • Compare different AI image providers

Available Commands

| Command | Use For | |---------|---------| | /imagegen:generate | Generate images from prompts | | /imagegen:edit | Edit existing images | | /imagegen:iterate | Refine images through multiple steps | | /imagegen:compare | Compare Google vs OpenAI | | /imagegen:assets | Generate project assets | | /imagegen:moodboard | Create design inspiration sets | | /imagegen:character | Create consistent character sheets | | /imagegen:config | Configure defaults |

Delegation

For complex image generation tasks, delegate to the image-generator subagent which has access to all generation scripts and can handle multi-step workflows.

Quick Reference

Providers

Google Gemini (Gemini)

  • Models: gemini-2.5-flash-image, gemini-3-pro-image-preview
  • Best for: Character consistency, multi-turn iteration, style variety
  • API Key: GEMINI_API_KEY or GOOGLE_API_KEY

OpenAI GPT-Image

  • Models: gpt-image-1.5, gpt-image-1, gpt-image-1-mini
  • Best for: Text in images, transparent backgrounds, precise edits
  • API Key: OPENAI_API_KEY

Common Sizes/Aspect Ratios

| Format | Google | OpenAI | |--------|--------|--------| | Square | 1:1 | 1024x1024 | | Landscape | 16:9 | 1536x1024 | | Portrait | 9:16 | 1024x1536 | | Wide | 21:9 | - |

Example Interactions

User: "Generate an image of a sunset over mountains" Action: Use /imagegen:generate --prompt "A sunset over mountains"

User: "Create app icons for my project" Action: Use /imagegen:assets --type icons --prompt "[ask for description]"

User: "Edit this image to add rain" Action: Use /imagegen:edit --image [path] --prompt "Add rain falling"

User: "I want to iterate on this design" Action: Use /imagegen:iterate --image [path] --prompt "[refinement]"

User: "Which provider would be better for logos?" Action: Explain Google is better for style variety, OpenAI for text, and suggest /imagegen:compare to test both.

Prerequisites Check

Before generating, verify:

  1. Required Python packages: google-genai, openai, Pillow (for resizing)
  2. API keys set in environment
  3. Output directory accessible
# Install packages
pip install google-genai openai Pillow

# Set API keys (user's responsibility)
export GEMINI_API_KEY=your_key
export OPENAI_API_KEY=your_key

Prompt Tips

Help users craft effective prompts:

  • Be descriptive but concise
  • Specify style (photorealistic, watercolor, minimalist)
  • Include lighting (golden hour, dramatic, soft)
  • Mention composition (close-up, wide shot, centered)
  • For characters, include distinctive features
  • For logos, specify simplicity level