site-check

Site Check MCP

A Model Context Protocol server that exposes the public Site Check API as 15 Claude tools. No API keys, no auth — just wire it up and ask Claude to audit any site.

Site Check itself is a Go API + Remix frontend from Pantheon Professional Services. This repo is a thin MCP wrapper so Claude can call it directly.

What you get

15 tools, all backed by https://api.site-check.ps-pantheon.com:

Tool	What it does
check_site	Full check: DNS, HTTP, TLS, security headers, email auth, Pantheon detection
check_seo	Title, meta, headings, images, robots.txt, sitemap, structured data
check_lighthouse	Lighthouse / PSI: scores, CWV, filmstrip, waterfall, asset breakdown
check_crux	Chrome UX Report real-user metrics
check_migration	10-point Pantheon migration readiness
check_batch	Up to 10 URLs in parallel
compare_sites	Crawl-based side-by-side comparison
probe_agcdn	Active AGCDN feature probing (WAF, IO, rate limiting)
check_bot_protection	Bot mitigation detection
check_hsts_preload	HSTS preload list check
discover_subdomains	CT logs + SecurityTrails subdomain discovery
check_resources	Broken CSS/JS/image/font audit
get_dns_history	Historical DNS via SecurityTrails
get_whois	WHOIS via SecurityTrails
check_har	Local HAR file analysis

Install

Claude Code (recommended)

/plugin marketplace add https://github.com/pantheon-systems-ps/site-check-mcp.git
/plugin install site-check

Done. Ask Claude: "Check the site pantheon.io".

Claude Desktop

1. Clone:

   git clone https://github.com/pantheon-systems-ps/site-check-mcp.git ~/Git/site-check-mcp
   

2. Build:

   cd ~/Git/site-check-mcp/server
   npm install && npm run build
   

3. Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

   {
     "mcpServers": {
       "site-check": {
         "command": "node",
         "args": ["/Users/YOU/Git/site-check-mcp/server/dist/index.js"]
       }
     }
   }
   

4. Restart Claude Desktop. The 15 tools appear under the hammer icon.

Try it

"Check the security headers on pantheon.io"
"Run a Lighthouse audit on example.com"
"Is example.com ready to migrate to Pantheon?"
"Compare site1.com vs site2.com"
"Discover subdomains for pantheon.io"

Configuration

Env var	Default	Description
SITE_CHECK_API_URL	https://api.site-check.ps-pantheon.com	Override the API host (e.g., for local dev or a staging environment)

Develop

cd server
npm install
npm run dev      # tsc --watch
npm run build    # one-shot build → dist/
npm start        # runs the built server on stdio (for manual testing)

The MCP server reads JSON-RPC over stdio per the Model Context Protocol spec. To test locally without Claude, use the MCP Inspector:

npx @modelcontextprotocol/inspector node dist/index.js

License

MIT — see LICENSE.

Related

• Site Check web UI — same checks, browser-based
• Model Context Protocol