seo-images-media

seo-images-media is a skill for Claude Code from Hainrixz/claude-seo-ai. It costs 72 tokens per session (1,281 once invoked), scanned A, original, MIT.

An accessibility and media check for web pages that reviews image descriptions, image sizing, file formats, and video markup. It helps make page media understandable to screen readers and search systems.

In plain words
What is it for?
Use it to audit page images and video, create contextual alternative text, add image dimensions, and identify media markup or format issues.
Why use it?
It finds missing, vague, repeated, or overloaded image descriptions and missing dimensions that can make pages harder to use or cause content to jump while loading. It also flags older media formats and missing video information for search engines.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the claude-seo-ai plugin — 34 skills, 5 agents, 1 hook shipped together

Good fit Use it to audit page images and video, create contextual alternative text, add image dimensions, and identify media markup or format issues.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add Hainrixz/claude-seo-ai
Claude Code
/plugin install claude-seo-ai

Made for: Claude Code.

Or install claude-seo-ai, the plugin that ships this one along with the rest of its 34 skills, 5 agents, 1 hook.

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 seo-images-media

README.md
[![agentmods](https://agentmods.dev/badge/skills/hainrixz/claude-seo-ai/seo-images-media/github.svg)](https://agentmods.dev/skills/hainrixz/claude-seo-ai/seo-images-media)
Your own site
<a href="https://agentmods.dev/skills/hainrixz/claude-seo-ai/seo-images-media"><img src="https://agentmods.dev/badge/skills/hainrixz/claude-seo-ai/seo-images-media/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for seo-images-media

Your own site · 80×15
<a href="https://agentmods.dev/skills/hainrixz/claude-seo-ai/seo-images-media"><img src="https://agentmods.dev/badge/skills/hainrixz/claude-seo-ai/seo-images-media.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 72 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,281 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00072 $0.01281
Opus 5 $0.00036 $0.00641
Sonnet 5 $0.00014 $0.00256
Haiku 4.5 $0.00007 $0.00128

Measured 4d ago against content hash 54eed1affba7, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

seo-images-media 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 4d 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.

skills/seo-images-media/SKILL.md · 42 lines

How it starts

The opening of the file, as written. The whole thing — 42 lines — stays where its author put it; the contents beside it link to each section on GitHub.

seo-images-media (M9)

Accessible, well-described media is read by both ranking systems and AI extractors — alt text is the primary semantic handle for an image. Reference: references/schema-tier1.md (VideoObject row).

Inputs

Work from the PageSnapshot named in your dispatch envelope: read parsed from <run_dir>/pages/<slug>.json (images[] with alt_present/sized/lazy, iframes, jsonld[]); Grep pages/<slug>.html for verbatim evidence; site artifacts live in <run_dir>/site/{robots.json,sitemaps.json,discovery.json}. Deterministic findings already emitted by audit.mjs are listed in <run_dir>/findings.deterministic.json — do not re-emit those ids; add model-judged findings only. If invoked directly with a URL/path and no snapshot exists, first run node "${CLAUDE_PLUGIN_ROOT}/scripts/snapshot.mjs" <target> --out "${CLAUDE_PLUGIN_DATA}/runs" and use the printed snapshot path.

Audits

Working from the PageSnapshot (parsed_rendered when render.used is not none, else parsed):

  1. Alt presence: every content <img> has an alt attribute. Distinguish decorative images (alt="" + role="presentation" is correct, not a finding) from missing alt entirely (fail).
  2. Alt quality: not empty on a content image; not the filename (IMG_2031.jpg); not duplicated verbatim across distinct images; not keyword-stuffed (comma-separated keyword lists are an anti-pattern). Alt should be descriptive and contextual to surrounding content. Target length ~80-140 chars — long enough to be specific, short enough that screen readers/AI don't truncate.
  3. Dimensions: width and height set on <img> (or aspect-ratio reserved in CSS) to prevent layout shift (CLS, a Core Web Vitals input — defer the CWV measurement itself to the perf module).
  4. Format: flag legacy jpg/png where a modern format (WebP/AVIF) or a responsive <picture>/srcset would serve smaller bytes.
  5. Video: embedded video (<video>, YouTube/Vimeo iframe) without VideoObject JSON-LD — coordinate with M5; required/recommended props in references/schema-tier1.md.

Read the full file on GitHub · 42 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. 4d ago Changed 54eed1affba7
  2. 6d ago Changed · +3 lines 606350efc498
  3. 12d ago First seen · 39 lines · 72 tokens per session scan A 108b4eada928

Subscribe to this mod's changes

seo-images-media is a skill published in the GitHub repository Hainrixz/claude-seo-ai (59 stars, last pushed 5d ago), licensed MIT. It adds 72 tokens to every session and 1,281 once invoked, about $0.0004 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.

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