Post-Launch QA with Fat Agent: Automated Audits and Fixes

Where this fits

You've just shipped a client site. The deployment is live, but you know the real work starts now: checking for broken links, missing meta tags, slow pages, and accessibility gaps. Manually auditing every page is tedious and error-prone. Fat Agent Skill turns Claude into a post-launch QA engineer that systematically audits your live site and walks you through fixes—so you can catch issues before your client does.

Why agents benefit

• Multi-domain audits in one pass: Runs checks for SEO, security, accessibility, performance, local SEO, e-commerce, email deliverability, i18n, and DNS—without you switching tools.
• Context-aware module selection: Auto-detects signals in your HTML (e.g., product schemas, local business markers) and runs only relevant audits, saving time and reducing noise.
• Site-wide crawling with persistence: Concurrently crawls your entire site into SQLite, enabling deep analysis and repeatable re-tests after fixes.
• Actionable fix generation: Instead of just reporting problems, it proposes concrete code changes and then re-tests to verify improvements.
• Conversational setup: It asks about your stack and critical flows, so the audit is tailored to your specific deployment.

Practical scenarios

1. Post-deployment sanity check for a marketing site

You've launched a new landing page. You say "run FAT agent" and it audits meta tags, heading hierarchy, image alt text, and page speed. It flags missing og:image and suggests adding it—then re-tests to confirm the fix.

2. E-commerce storefront audit before a promo campaign

With product pages, it detects structured data issues, broken checkout links, and missing hreflang tags. It also checks email deliverability headers and DNS records, ensuring your promo emails won't land in spam.

3. Accessibility compliance for a government client

You need WCAG 2.1 AA checks. Fat Agent runs axe-core tests, identifies contrast failures and missing ARIA labels, and provides code snippets to fix them. You can then re-run the audit to show a clean report.

Add it to your agent workflow

Install the skill with:

npx skills add spruikco/fat-agent-skill

Then, in Claude, after deploying a site, simply say:

Run FAT agent on https://example.com

It will ask a few clarifying questions (stack, critical flows), then execute the audit and present findings with suggested fixes. You can iterate until the FAT score improves.

Compare before adopting

Before integrating, compare Fat Agent with your existing QA tooling. Look at:

• Quality signals: Check the badge for 915 passing tests and CI status—does it stay updated?
• Maintenance freshness: Recent commits and release cadence matter for a tool that needs to keep up with web standards.
• Alternatives: Lighthouse CI, Pa11y, or custom scripts may cover parts, but Fat Agent bundles them into one agent-driven workflow.
• Workflow fit: Does it integrate with your current Claude setup? The npx install is simple, but verify it works with your agent runtime.

Why it is worth tracking

Fat Agent Skill has 38 stars and an active CI pipeline, suggesting a healthy community and ongoing maintenance. Its modular design means new audit modules can be added without breaking existing ones. If you regularly ship client sites and want to automate post-launch QA, this skill is worth evaluating now—especially if you're already using Claude for development tasks. For a deeper look, check its page on OpenAgentSkill.