image-seo

image-seo is a skill for Claude Code from nowork-studio/notfair-plugin. It costs 197 tokens per session (865 once invoked), scanned A, original, MIT.

An image-search-visibility and performance audit skill for websites. It checks whether images can appear in Google Images and whether they slow pages or hurt page stability.

In plain words
What is it for?
Use it to review alt text, filenames, WebP or AVIF conversion, compression, responsive image settings, lazy loading, dimensions, and image sitemaps.
Why use it?
It identifies missing descriptions, oversized files, poor formats, and loading problems that can reduce image traffic and page quality.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter.

Part of the notfair plugin — 52 skills, 1 MCP server shipped together

About the project

NotFair Plugin is a collection of open-source SEO, generative-engine-optimization, and marketing workflows that AI agents can follow. It helps agents audit websites, analyze search and advertising data, plan campaigns, and make reviewable marketing changes; the catalogue entries are its skills, instructions, MCP connection, and plugin.

nowork-studio/notfair-plugin · 3,508 stars · on GitHub · notfair.co

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/nowork-studio/notfair-plugin/image-seo
Any agent
npx skills add nowork-studio/notfair-plugin --skill image-seo
Clone the repo
git clone --depth 1 https://github.com/nowork-studio/notfair-plugin

Made for: Claude Code.

Or install notfair, the plugin that ships this one along with the rest of its 52 skills, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for image-seo

README.md
[![agentmods](https://agentmods.dev/badge/skills/nowork-studio/notfair-plugin/image-seo.svg)](https://agentmods.dev/skills/nowork-studio/notfair-plugin/image-seo)
Your own site
<a href="https://agentmods.dev/skills/nowork-studio/notfair-plugin/image-seo"><img src="https://agentmods.dev/badge/skills/nowork-studio/notfair-plugin/image-seo.svg" alt="Measured on agentmods" height="20"></a>
Per session 197 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 865 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00197 $0.00865
Opus 5 $0.00098 $0.00432
Sonnet 5 $0.00039 $0.00173
Haiku 4.5 $0.00020 $0.00086

Measured 7d ago against content hash b1b4e599faf0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

image-seo scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

seo/image-seo/SKILL.md · 73 lines

How it starts

The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Image SEO Audit

You are a technical-SEO engineer specializing in visual search and image performance. Your job is to find why a site's images aren't earning Google Images traffic and where they're hurting page experience — then return concrete fixes.

Credit: capability inspired by the open-source claude-seo project (MIT, Agrici Daniel). Implementation is original to NotFair.


Step 0 — Scope

Collect the target ($URL) — a page, a template (e.g. all product pages), or the site. If broad, pick 3–5 representative pages; image issues are template-level.

Phase 0 — Preflight & data

Read and follow ../shared/preamble.md. GSC optional — if connected, pull the Search results → Search appearance → Image filter to see current image traffic and which pages already earn it.

Phase 1 — Crawl images

For each page, extract every <img>, <picture>/<source>, and CSS background that carries meaning, and record: src, alt, intrinsic dimensions, byte size, format, loading, srcset/sizes, explicit width/height.

Phase 2 — Audit each image

  • Alt text — present, descriptive, keyword-relevant (not stuffed), empty alt="" only for decorative images. Flag missing/duplicate/"image123.jpg"-style alt.
  • File name — descriptive, hyphenated, lowercase ASCII (e.g. automatic-sliding-door.webp), not IMG_4821.JPG.
  • Format — WebP/AVIF for photos; SVG for icons/line art; flag oversized PNG/JPEG.
  • Weight — flag images over ~150–200 KB or far larger than their display size.
  • Responsivesrcset/sizes present so mobile doesn't download desktop assets.
  • CLS — explicit width/height (or aspect-ratio) on every img to reserve space.
  • Lazy-loadloading="lazy" for below-the-fold; the LCP/hero image must NOT be lazy-loaded (common, costly mistake — check it).

Phase 3 — Discoverability layer

  • Image sitemap entries (or image: extensions in the main sitemap).
  • ImageObject / Product.image / Article.image structured data where relevant.
  • Images reachable in HTML (not injected only by JS that Google may not render).
  • Surrounding text/captions reinforce the image topic.

Read the full file on GitHub · 73 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 7d ago First seen · 73 lines · 197 tokens per session scan A b1b4e599faf0

Subscribe to this mod's changes

image-seo is a skill published in the GitHub repository nowork-studio/notfair-plugin (3,508 stars, last pushed today), licensed MIT. It adds 197 tokens to every session and 865 once invoked, about $0.0010 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

Other skills, from other repositories

octowiz

Octowiz AI coding workflow coordinator. Reads IntegraHub memory doctrine at runtime, detects where you are in the development lifecycle, and routes to the right skill combination from superpowers + mattpocock-skills. Use this skill at the START of any development work — whether you have a fresh idea, an existing plan…

raelli/octowiz · 139 tokens

setup

Setup orchestrator for the Octowiz Bridge. Re-runs the live environment check, builds a gap list, and runs only the phases needed: plugins, memory, repo, verify. Invoked automatically by octowiz:octowiz when hard gaps are detected.

raelli/octowiz · 57 tokens

build-user-persona

Build evidence-backed user personas from research inputs. Creates structured persona documents grounded in evidence, with each attribute clearly labeled as research-validated or inferred. Use this skill when you need personas for an FR, strategy doc, or design brief. Trigger on: "build a persona", "create user…

felipecabargas/gambit · 105 tokens

competitive-analysis

Structure a competitive landscape analysis — player profiles, capability comparison matrix, whitespace opportunities, and strategic implications. Use this skill when entering a new market, refreshing strategy, or preparing for a planning cycle. Trigger on: "do a competitive analysis", "who are our competitors"…

felipecabargas/gambit · 100 tokens

write-product-strategy

Generate comprehensive product strategy documents aligned with business goals. Use this when defining or updating your product's strategic direction, aligning teams on where to play and how to win, or creating a STRATEGY.md that bridges vision and execution. Triggers include: clarifying product strategy, articulating…

felipecabargas/gambit · 120 tokens

synthesize-user-research

Synthesize raw user research (interview notes, survey results, support tickets, NPS verbatims) into structured insights: themes, pain points, jobs-to-be-done, and research gaps. Use this skill when you need to make sense of qualitative research data before writing a feature request or building personas. Trigger on…

felipecabargas/gambit · 126 tokens