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Web Validator by DigestSEO MCP Server

by akzar1el Your server? Claim it
answering

Web Validator by DigestSEO is answering right now. Last checked 4 min ago. 1 452 installs a week from npm. It exposes 8 tools. Last commit 28 Oct 2026.

Audit public webpages and supplied markup for HTML, CSS, SEO, JSON-LD, and link issues.

Installs per day peak 2 038 · avg 328 · -93% w/w
a month agotoday
Uptime history 66 days of history · worst day 92%
66 days agonow
100.0%
Uptime 24h
91 of 91 checks
8
Tools
read from the server
285 ms
Response time
average over 24h
1 452
Installs / week
npm and PyPI

What the code does

We read the source, 5 d ago · tools taken from the live server · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Long encoded blob in source chatgpt-plugin/src/language-subtags.ts:5, src/language-subtags.ts:5 
  "MzQmR8cZEAlkUwQAiBBoHIQMCZSAAkNEkMZZZVwEBIAR9GfXUBgOwG0ObaGJRCBhQEACAwAAEADAQdHd90d0m1NABAJCBAEQAAQAIAAAAEEABAJA8N/f7//+/7u9/++vf//Bc/V2OYf///8P9zvw//9cUCiX/t//9///f/f///////8/nv7//9/Eq6Dn+///7/9///////+9Qh8P33X+SXEA8t3++ZMcgv/r/v////////f/////1////3//9/////////77//////7/////+…

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

run in your terminal
claude mcp add mcp-web-validator --transport http https://web-validator-mcp.digestseo.com/mcp
Settings → Connectors → Add custom connector, then paste this address
https://web-validator-mcp.digestseo.com/mcp
~/.codex/config.toml
[mcp_servers.mcp-web-validator]
url = "https://web-validator-mcp.digestseo.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "mcp-web-validator": {
      "url": "https://web-validator-mcp.digestseo.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "mcp-web-validator": {
      "type": "http",
      "url": "https://web-validator-mcp.digestseo.com/mcp"
    }
  }
}

Available tools 8

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

audit
audit_public_site
Use 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 more sitemap pages remain.
audit_public_webpage
Use 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_seo_metadata
Use 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
validate_css
Use this when raw CSS source is supplied. Parses it inside the Worker and returns syntax messages without contacting an external service.
validate_html
Use 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_schema_markup
Use this for a focused JSON-LD syntax check of supplied HTML. It parses JSON only and does not validate Schema.org vocabulary semantics.
broken
check_broken_links
Use 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
generate_validation_report
Use 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.

Endpoints

URLTransportStateLatencyChecked
https://web-validator-mcp.digestseo.com/mcp streamable-http answering 179 ms 4 min ago

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Web Validator by DigestSEO — questions

Answers built from our own checks of this server.

What can Web Validator by DigestSEO do?
It exposes 8 tools, read directly from the server on our last check. Among them: audit_public_site, audit_public_webpage, audit_seo_metadata, check_broken_links, generate_validation_report, validate_css and 2 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
What is Web Validator by DigestSEO mostly used for?
Its tools cluster around validate and audit. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.
Is Web Validator by DigestSEO working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 285 ms. The bar chart above shows every period we have measured.
How do I connect Web Validator by DigestSEO?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Web Validator by DigestSEO need an API key?
No. Web Validator by DigestSEO completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 8 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Web Validator by DigestSEO?
It answers our handshake in 285 ms on average, which is faster than 50% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
How many people use Web Validator by DigestSEO?
The npm package mcp-web-validator was installed 1 452 times in the last week. Week over week that is -93%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Web Validator by DigestSEO open source?
The code is open source: it is published under the MIT licence, written in TypeScript, 9 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at web-validator-mcp.digestseo.com, which runs on its operator's own terms.