Fat Agent Skill — Security skill for Claude Code

🍔 FAT Agent — Fix, Audit, Test


**A Claude plugin that acts as your post-launch QA engineer.**

FAT Agent systematically audits deployed websites for SEO, performance, security, accessibility, and content issues — then walks you through fixing every one.

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What It Does

After you deploy a site, say **"run FAT agent"** and it will:

1. Gather context — Asks smart questions about your site, stack, and critical user flows
2. Audit — Runs 8 automated check categories against your live URL
3. Report — Generates a prioritised punch list (P0 Critical → P3 Nice-to-have)
4. Fix — Offers to generate code fixes for every issue found
5. Re-test — After you redeploy, verifies the fixes are live

Audit Categories

Category	Automated?	What It Checks
🌐 Availability & Response	✅	HTTP status, redirects, response headers, caching
🔍 SEO Essentials	✅	Title, meta, headings, OG tags, structured data, sitemap, robots.txt
⚡ Performance	✅	HTML size, render-blocking scripts, lazy loading, resource hints
🔒 Security Headers	✅	HSTS, CSP, X-Frame-Options, Referrer-Policy, Permissions-Policy
♿ Accessibility	Partial	Alt text, labels, landmarks, skip links + targeted user questions
🧪 Functional Checks	👤 User	Forms, navigation, mobile, 404 page, integrations
📝 Content & Legal	Partial	Placeholder text, privacy policy, copyright year
📊 Analytics & Tracking	✅	GA4, GTM, Facebook Pixel, Plausible, Hotjar, Fathom, Umami, Mixpanel, PostHog + 10 more

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Installation

Claude Code Plugin (Recommended)

claude plugins add https://github.com/spruikco/fat-agent-skill

This installs the FAT Agent plugin with the `/fat-audit` slash command.

Claude Code (Manual)

git clone https://github.com/spruikco/fat-agent-skill ~/.claude/skills/fat-agent

Claude Code reads `SKILL.md` automatically and activ