Image SEO Audit

A focused, page-level (or domain-sample) audit of every <img> and <picture> on the target. Surfaces alt-text issues, format gaps (WebP/AVIF coverage), responsive-image gaps (srcset / sizes), LCP and CLS risk, and missing ImageObject markup. Output is a prioritised remediation list plus paste-ready <picture> and JSON-LD snippets.

Adapted from AgriciDaniel/claude-seo's seo-images skill (MIT). Rubric, lazy-loader taxonomy, and severity ladder track the upstream implementation; data sources are wired to this catalogue's SE Ranking / Firecrawl / Google APIs stack.

Prerequisites

• Required for inventory: mcp__firecrawl-mcp__firecrawl_scrape (raw HTML access). WebFetch returns markdown only — every <img> attribute (srcset, sizes, loading, fetchpriority, width, height, data-src* lazy variants) is stripped before the skill ever sees it. Without Firecrawl the audit cannot run. Install via bash extensions/firecrawl/install.sh.
• Optional (PSI byte-saving estimates): google-api.json configured (Tier 0 — API key only). When present, step 9 runs and adds real Lighthouse wastedBytes per image to the remediation list.
• Optional (SE Ranking audit cross-reference): SE Ranking MCP server connected and a recent audit for the domain. When present, step 10 elevates image-related audit issues onto the same remediation list.
• User provides: a target URL (single-page audit) or a domain (sampled audit). For domains, the skill confirms how many pages to sample before spending Firecrawl credits.

Process