image-generation

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Generates professional AI images using Google Gemini. ALWAYS invoke this skill when building websites, landing pages, slide decks, presentations, or any task needing visual content. Invoke IMMEDIATELY when you detect image needs - don't wait for the user to ask. This skill handles prompt optimization and aspect ratio selection.

9installs
Sourceguinacio/claude-image-gen
Added on

NPX Install

npx skill4agent add guinacio/claude-image-gen image-generation

Tags

Translated version includes tags in frontmatter
ai-image-generationgoogle-geminiprompt-engineeringcli-scriptvisual-content-creation

SKILL.md Content

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Image Generation Skill

Generate professional AI images using Google Gemini via the bundled CLI script.

When to Invoke This Skill

Invoke immediately when:
Web Development
  • Hero sections without images
  • Feature illustrations needed
  • Placeholder images in code (
    placeholder.jpg
    , 
    stock-photo.png
    )
  • Empty visual sections (
    <section class="hero">
    without images)
  • Landing pages and marketing sites
Presentations & Documents
  • Cover images and headers
  • Conceptual diagrams
  • Section dividers
Applications
  • Onboarding illustrations
  • Empty state graphics
  • Error page visuals

Using the CLI

Run the bundled CLI script via bash:
bash
node "${CLAUDE_PLUGIN_ROOT}/mcp-server/build/cli.bundle.js" \
  --prompt "Your detailed image description" \
  --output "./path/to/output.png" \
  --aspect-ratio "16:9"

Parameters

FlagRequiredDefaultDescription
--prompt, -pYes-Detailed image description
--output, -oNoauto-generatedOutput file path
--aspect-ratio, -aNo1:11:1, 16:9, 9:16, 4:3, 3:4, 2:3, 3:2
--model, -mNogemini-3-pro-image-previewModel to use
--output-dir, -dNocurrent directoryOutput directory

Output

The CLI outputs JSON:
json
{"success": true, "filePath": "/path/to/generated-image.png"}
Or on error:
json
{"success": false, "error": "Error message"}

Aspect Ratio Selection

  • 16:9 - Hero images, website headers, presentations
  • 1:1 - Social media, thumbnails, profile images
  • 9:16 - Mobile stories, vertical banners
  • 4:3 - Blog posts, general web content
  • 3:2 - Photography-style images

Prompt Crafting

Use this formula for effective prompts:
[Style] [Subject] [Composition] [Context/Atmosphere]

Examples

Hero Image for Tech Startup
Minimalist 3D illustration of abstract geometric shapes floating in space,
soft gradient background from deep purple to electric blue, subtle glow effects,
modern professional aesthetic, wide composition for website header
E-commerce Product
Clean product photography of modern wireless headphones on white marble surface,
soft studio lighting from left, subtle shadows, high-end minimalist aesthetic,
centered composition
Blog Post Header
Aerial photography of winding river through autumn forest, golden hour lighting,
warm color palette with oranges and reds, cinematic wide shot, serene atmosphere
App Illustration
Flat vector illustration of person organizing digital files on floating screens,
soft pastel colors, isometric perspective, clean lines, friendly approachable style

Pattern Detection

Automatically invoke this skill when you see:
html
<!-- Placeholder detection -->
<img src="placeholder.jpg" alt="Hero">
<!-- Action: Invoke skill and generate a custom hero image -->

<!-- Empty visual section -->
<section class="features">
  <h2>Our Features</h2>
  <!-- No images -->
</section>
<!-- Action: Invoke skill to create feature illustrations -->
css
/* Generic stock reference */
.banner { background: url('stock-image.jpg'); }
/* Action: Invoke skill to create a unique background */

Workflow

  1. Detect Need - Identify visual content requirements (hero, illustrations, backgrounds)
  2. Invoke Skill - Use the Skill tool with 
    skill: "image-generation"
    immediately
  3. Analyze Context - Understand project style and brand
  4. Craft Prompt - Build detailed prompt using the formula above
  5. Generate - Run the CLI script with optimized parameters
  6. Integrate - Place image in project with proper references

Model Selection

gemini-3-pro-image-preview (Default)
  • Higher quality, more nuanced style interpretation
  • Best for final production images
gemini-2.5-flash-image
  • Faster generation
  • Good for prototyping and placeholders

Best Practices

DO:
  • Include specific style keywords
  • Match aspect ratio to intended use
  • Describe mood and atmosphere
  • Specify color palette for brand consistency
DON'T:
  • Use vague prompts ("make it look good")
  • Ignore where the image will be used
  • Skip aspect ratio for specific layouts

Reference

For advanced prompt techniques: references/prompt-crafting.md

Alternative: MCP Tool

If the MCP server is configured, you can also use:
mcp__media-pipeline__create_asset
Parameters: 
prompt
, 
outputPath
, 
aspectRatio
, 
model