Web Validator by DigestSEO
Audit public webpages and supplied markup for HTML, CSS, SEO, JSON-LD, and link issues.
Connect it
Settings → Connectors → Add custom connector
URL: https://web-validator-mcp.digestseo.com/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://web-validator-mcp.digestseo.com/mcp{
"mcpServers": {
"mcp-web-validator": {
"url": "https://web-validator-mcp.digestseo.com/mcp"
}
}
}claude mcp add --transport http mcp-web-validator https://web-validator-mcp.digestseo.com/mcp{
"servers": {
"mcp-web-validator": {
"type": "http",
"url": "https://web-validator-mcp.digestseo.com/mcp"
}
}
}{
"mcpServers": {
"mcp-web-validator": {
"command": "npx",
"args": [
"-y",
"mcp-web-validator@1.3.42"
]
}
}
}claude mcp add mcp-web-validator -- npx -y mcp-web-validator@1.3.428 tools, verified live
validate_htmlread-onlyUse this when raw HTML markup is supplied. Sends that markup to the Nu HTML Checker hosted at validator.nu and returns validation messages. For a live URL, use audit_public_webpage.
validate_cssread-onlyUse this when raw CSS source is supplied. Parses it inside the Worker and returns syntax messages without contacting an external service.
audit_seo_metadataread-onlyUse this for a focused SEO/accessibility-signal check of supplied HTML. It does not fetch a live webpage; use audit_public_webpage for a URL.
validate_schema_markupread-onlyUse this for a focused JSON-LD syntax check of supplied HTML. It parses JSON only and does not validate Schema.org vocabulary semantics.
check_broken_linksread-onlyUse this for a focused check of up to 20 public HTTP(S) links found in supplied HTML. It does not fetch base_url, follow redirects, or retain response bodies.
generate_validation_reportread-onlyUse this when HTML markup is already supplied. Combines Nu HTML validation with local CSS, SEO, accessibility-signal, and JSON-LD syntax checks. It does not fetch a webpage from base_url; use audit_public_webpage for a live URL.
audit_public_webpageread-onlyUse this when the user provides one live public webpage URL. Fetches one bounded static HTML response, then runs HTML validation, SEO/accessibility-signal, and JSON-LD syntax checks. It checks links only when requested and does not crawl, execute JavaScript, authenticate, or fetch linked stylesheets. Use only URLs the user owns or is authorized to inspect.
audit_public_siteread-onlyUse this for a bounded, sitemap-first audit of a public website the user owns or is authorized to inspect. It fetches at most 8 same-origin HTML pages per call, respects robots.txt, and returns compact page summaries plus deduplicated findings. It does not recursively follow HTML links, authenticate, execute JavaScript, fetch assets, or run site-wide link checks. Use page_offset to continue when m
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