Skill Claude CodeCodex
Detect, validate, and generate Schema.org structured data. JSON-LD format preferred. Use when user says "schema", "structured data", "rich results", "JSON-LD", or "markup".
Skill Claude CodeCodex
Analyze existing XML sitemaps or generate new ones with industry templates. Validates format, URLs, and structure. Use when user says "sitemap", "generate sitemap", "sitemap issues", or "XML sitemap".
Skill Claude CodeCodex
Technical SEO audit across 8 categories: crawlability, indexability, security, URL structure, mobile, Core Web Vitals, structured data, and JavaScript rendering. Use when user says "technical SEO", "crawl issues", "robots.txt", "Core Web Vitals", "site speed", or "security headers".
Skill Claude CodeCodex
Visual analysis, screenshot capture, mobile rendering testing, and Visual Search readiness assessment. Uses Playwright for multi-viewport screenshots and above-the-fold analysis. Checks Google Lens optimization and image discoverability. Use when user says "visual", "screenshot", "mobile rendering", "above the fold"…
Skill Claude Code
Comprehensive SEO analysis for any website or business type. Performs full site audits, single-page deep analysis, technical SEO checks (crawlability, indexability, Core Web Vitals with INP), schema markup detection/validation/generation, content quality assessment (E-E-A-T framework per Dec 2025 update extending to…
01clauding/harness-engineering
Skill Codex
Design, debug, and harden the harness around coding agents in medium or large repositories. Use when Codex, Claude Code, Cursor, Windsurf, Copilot, or custom agents need AGENTS.md or CLAUDE.md cleanup, repo knowledge routing, skills, hooks, review and eval loops, migration governance, subagent boundaries, worktrees…
At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: