SEO Image Gen: AI Image Generation for SEO Assets (Extension)

Generate production-ready images for SEO use cases using Gemini's image generation

via the banana Creative Director pipeline. Maps SEO needs to optimized domain modes,

aspect ratios, and resolution defaults.

Architecture Note

This extension is built on Claude Banana,

the standalone AI image generation skill for Claude Code.

This skill has two components with distinct roles:

• SKILL.md (this file): Handles interactive /seo image-gen commands for generating images

• Agent (agents/seo-image-gen.md): Audit-only analyst spawned during /seo audit to assess existing OG/social images and produce a generation plan (never auto-generates)

Prerequisites

This skill requires the banana extension to be installed:

./extensions/banana/install.sh

Check availability: Before using any image generation tool, verify the MCP server

is connected by checking if gemini_generate_image or set_aspect_ratio tools are

available. If tools are not available, inform the user the extension is not installed

and provide install instructions.

Quick Reference

Command

What it does

/seo image-gen og <description>

Generate OG/social preview image (1200x630 feel)

/seo image-gen hero <description>

Blog hero image (widescreen, dramatic)

/seo image-gen product <description>

Product photography (clean, white BG)

/seo image-gen infographic <description>

Infographic visual (vertical, data-heavy)

/seo image-gen custom <description>

Custom image with full Creative Director pipeline

/seo image-gen batch <description> [N]

Generate N variations (default: 3)

SEO Image Use Cases

Each use case maps to pre-configured banana parameters:

Use Case

Aspect Ratio

Resolution

Domain Mode

Notes

OG/Social Preview

16:9

1K

Product or UI/Web

Clean, professional, text-friendly

Blog Hero

16:9

2K

Cinema or Editorial

Dramatic, atmospheric, editorial quality

Schema Image

4:3

1K

Product

Clean, descriptive, schema ImageObject

Social Square

1:1

1K

UI/Web

Platform-optimized square

Product Photo

4:3

2K

Product

White background, studio lighting

Infographic

2:3

4K

Infographic

Data-heavy, vertical layout

Favicon/Icon

1:1

512

Logo

Minimal, scalable, recognizable

Pinterest Pin

2:3

2K

Editorial

Tall vertical card

Generation Pipeline

For every generation request:

• Identify use case from command or context (og, hero, product, etc.)

• Apply SEO defaults from the use cases table above

• Set aspect ratio via set_aspect_ratio MCP tool

• Construct Reasoning Brief using the banana Creative Director pipeline:

• Load references/prompt-engineering.md for the 6-component system

• Apply domain mode emphasis (Subject 30%, Style 25%, Context 15%, etc.)

• Be SPECIFIC and VISCERAL: describe what the camera sees

• Generate via gemini_generate_image MCP tool

• Post-generation SEO checklist (see below)

Check for Presets

If the user mentions a brand or has SEO presets configured:

python3 scripts/presets.py list

Load matching preset and apply as defaults. Also check references/seo-image-presets.md

for SEO-specific preset templates.

Post-Generation SEO Checklist

After every successful generation, guide the user on:

• Alt text:Write descriptive, keyword-rich alt text for the generated image

• File naming:Rename to SEO-friendly format: keyword-description-widthxheight.webp

• WebP conversion:Convert to WebP for optimal page speed:

magick output.png -quality 85 output.webp

• File size:Target under 200KB for hero images, under 100KB for thumbnails

• Schema markup:Suggest ImageObject schema for the generated image:

{

  "@type": "ImageObject",

  "url": "https://example.com/images/keyword-description.webp",

  "width": 1200,

  "height": 630,

  "caption": "Descriptive caption with target keyword"

}

• OG meta tags:For social preview images, remind about:

<meta property="og:image" content="https://example.com/images/og-image.webp" />

<meta property="og:image:width" content="1200" />

<meta property="og:image:height" content="630" />

<meta property="og:image:alt" content="Descriptive alt text" />

Cost Awareness

Image generation costs money. Be transparent:

• Show estimated cost before generating (especially for batch)

• Log every generation: python3 scripts/cost_tracker.py log --model MODEL --resolution RES --prompt "brief"

• Run cost_tracker.py summary if user asks about usage

Approximate costs (gemini-3.1-flash):

• 512: ~$0.02/image

• 1K resolution: ~$0.04/image

• 2K resolution: ~$0.08/image

• 4K resolution: ~$0.16/image

Model Routing

Scenario

Model

Why

OG images, social previews

gemini-3.1-flash-image-preview @ 1K

Fast, cost-effective

Hero images, product photos

gemini-3.1-flash-image-preview @ 2K

Quality + detail

Infographics with text

gemini-3.1-flash-image-preview @ 2K, thinking: high

Better text rendering

Quick drafts

gemini-2.5-flash-image @ 512

Rapid iteration

Error Handling

Error

Resolution

MCP not configured

Run ./extensions/banana/install.sh

API key invalid

New key at https://aistudio.google.com/apikey

Rate limited (429)

Wait 60s, retry. Free tier: ~10 RPM / ~500 RPD

IMAGE_SAFETY

Rephrase prompt - see references/prompt-engineering.md Safety section

MCP unavailable

Fall back: python3 scripts/generate.py --prompt "..." --aspect-ratio "16:9"

Extension not installed

Show install instructions: ./extensions/banana/install.sh

Cross-Skill Integration

• seo-images (analysis) feeds into seo-image-gen (generation): audit results from /seo images identify missing or low-quality images; use those findings to drive /seo image-gen commands

• seo-audit spawns the seo-image-gen agent (not this skill) to analyze OG/social images across the site and produce a prioritized generation plan

• seo-schema can consume generated images: after generation, suggest ImageObject schema markup pointing to the new assets

Reference Documentation

Load on-demand. Do NOT load all at startup:

• references/prompt-engineering.md:6-component system, domain modes, templates

• references/gemini-models.md:Model specs, rate limits, capabilities

• references/mcp-tools.md:MCP tool parameters and responses

• references/post-processing.md:ImageMagick/FFmpeg pipeline recipes

• references/cost-tracking.md:Pricing, usage tracking

• references/presets.md:Brand preset management

• references/seo-image-presets.md:SEO-specific preset templates

Response Format

After generating, always provide:

• Image path:where it was saved

• Crafted prompt:show what was sent to the API (educational)

• Settings:model, aspect ratio, resolution

• SEO checklist:alt text suggestion, file naming, WebP conversion

• Schema snippet:ImageObject or og:image markup if applicable