Audit any website with Claude before you ship (free, no API keys)

#webdev #seo #ai #mcp

Before shipping anything to production, ask Claude to audit it. Here's the exact setup and what you get.

Setup (30 seconds)

claude mcp add siteaudit -- uvx --from siteaudit-mcp siteaudit

SiteAudit MCP gives Claude 11 website audit tools. No API keys. No accounts.

The full audit

Run a full audit on https://yoursite.com and give me a prioritized action plan.

Claude calls full_audit("https://yoursite.com") and returns:

Full Audit — yoursite.com

Overall score: 67/100

SEO (72/100):
✓ Title tag present and good length
✓ Meta description present  
✗ Missing canonical URL on 3 pages
✗ No schema markup detected
✗ H1 missing on /about page
⚠ robots.txt exists but blocks /blog/ — intentional?

Performance (58/100):
✗ LCP: 4.1s (threshold: 2.5s) — FAIL
✗ CLS: 0.18 (threshold: 0.1) — FAIL
✓ FID/INP: 89ms — PASS
✓ TTFB: 0.3s — good
Largest Contentful Paint element: hero image (2.4MB — compress this)

Security (81/100):
✓ HTTPS enforced
✓ HSTS header present
✗ Missing Content-Security-Policy
✗ X-Frame-Options not set (clickjacking risk)
✓ X-Content-Type-Options present

Accessibility (71/100):
⚠ 4 images missing alt text
✗ 2 form inputs without labels
✓ Color contrast passes on main content
⚠ Skip navigation link missing

Priority action plan:
1. [CRITICAL] Compress hero image: 2.4MB → target <200KB. This alone fixes LCP.
2. [HIGH] Add X-Frame-Options and CSP headers (15 min in nginx/CDN config)
3. [HIGH] Add canonical URLs to all pages
4. [MEDIUM] Add schema markup (Organization + WebPage at minimum)
5. [MEDIUM] Fix 4 missing alt texts
6. [LOW] Add H1 to /about

That's the actual output. Not a checklist you have to interpret — a prioritized action plan.

Pre-launch checklist prompt

I'm about to launch https://staging.myapp.com. 
Give me a go/no-go assessment focused on what would 
embarrass me in front of users or hurt SEO on day 1.

Competitor analysis

Compare my site (https://mysite.com) vs 
my main competitor (https://competitor.com). 
Where are they beating me?

Returns a side-by-side on SEO score, performance, security, and accessibility with delta analysis.

Useful for

Pre-deployment: catch issues before users see them
Client pitching: walk in with actual data ("your site has 4 security header issues and LCP at 4.1s")
Sprint planning: turn audit results into a concrete backlog
Regression monitoring: run after every deploy to catch regressions

All 11 tools

Tool	What it audits
`full_audit`	Everything below combined
`seo_audit`	Meta, headings, canonical, schema, robots, sitemap
`performance_audit`	Lighthouse via Google PageSpeed
`security_audit`	HTTPS, HSTS, CSP, X-Frame-Options, other headers
`accessibility_audit`	WCAG 2.1 violations
`compare_sites`	Side-by-side of two URLs
`lighthouse_audit`	Raw Lighthouse scores
`check_links`	Broken link detection
`check_robots_txt`	robots.txt analysis
`seo_meta_check`	Meta tags deep-dive
`core_web_vitals`	CWV only

Install

# Claude Code
claude mcp add siteaudit -- uvx --from siteaudit-mcp siteaudit

# Claude Desktop
{
  "mcpServers": {
    "siteaudit": {
      "command": "uvx",
      "args": ["--from", "siteaudit-mcp", "siteaudit"]
    }
  }
}