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MCP Web Validator

Claimed

by AKzar1el

W3C HTML/CSS Validator and Technical SEO Audit MCP Server. Part of the DigestSEO (https://digestseo.com) suite.

Set up this server

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01 / Choose your client

02 / Before you connect

Authentication is not specified. Check the project instructions before connecting.

Install the runtime required by the project and make it available to your client.

Project instructions

Use names from the project instructions, separated by commas. Enter names only, never secret values.

03 / Add the configuration

Source: generated from public install instructions

claude mcp add --transport stdio 'mcp-web-validator' -- 'npx' '-y' 'mcp-web-validator'

Run in your terminal after replacing any placeholders.

04 / Check it in your client

Open your client’s MCP settings and confirm the server connects and lists its tools. A copied configuration does not confirm a working connection.

accessibilitycss-validatordeveloper-toolshtml-validatormcpmodel-context-protocolseo-auditw3cw3c-validator

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Security profile

Exposure: Limited

Runs commands or loads code on your machine, but does not reach secrets or other agents.

What this server can reach, from a static read of the shipped code. Nothing was executed and nothing here is a verdict: a browser tool has to run commands and an API wrapper has to call its API. Decide what fits your setup.

NVIDIA SkillSpector v2.11.0, MCPVault MCP-server policy. Scanned 5 days ago @ cb0a306.

Detected

  • Talks to external services1 places

    Makes outbound requests. The hosts are listed so you can see where data goes.

    html5.validator.nu

  • Contains instructions aimed at AI agents1 places

    Text in code or agent-facing files that steers a model. Worth reading before you trust it.

  • Passes model output on without checks1 places

    Model output reaches HTML, SQL or a shell without validation.

Not detected: reads environment variables in bulk, sends conversation content outward, runs shell commands, reads or writes other agents' configuration, accesses credential files, uses elevated privileges, installs itself to run later, matches a known malicious pattern.

Dependencies with known advisories

None found in the lockfiles and manifests checked against OSV.dev.

Left out of the profile

29 pattern matches in documentation, configuration or CI files were recorded but are not part of the profile, because they do not run when the server does. The owner dashboard lists them.

How the profile works Maintainers see file, line and a fix for each item in their dashboard.

16 of 16 tools

Documented tools (16)

From project documentation. A server handshake does not verify each tool’s description or behavior.

audit_public_site

Run a bounded sitemap-first audit of up to eight authorized, same-origin public pages. It respects robots.txt, returns compact page coverage and deduplicated findings, and does not run site-wide link checks.

audit_public_webpage

Fetch one authorized public HTML page and run the combined HTML, SEO/accessibility-signal, and JSON-LD syntax audit. Link checks are optional.

audit_seo_metadata

Audit supplied HTML for covered on-page SEO and accessibility signals.

check_broken_links

Check up to 20 authorized public links extracted from supplied HTML.

css.local

Validate a local CSS file.

generate_validation_report

Combine the checks for supplied markup; baseurl resolves relative links but does not fetch a page.

html.local

Validate a local HTML file.

html.url

Validate the markup returned by a public URL.

links.broken

Check links extracted from supplied HTML.

report.validation

Combine HTML, optional CSS, SEO, JSON-LD, and bounded link checks in a Markdown report.

schema.markup

Parse JSON-LD blocks and report JSON syntax errors.

screenshot.capture

Capture desktop, tablet, mobile, or custom viewport screenshots.

seo.metadata

Audit titles, descriptions, canonical tags, headings, viewport metadata, image alt attributes, and Open Graph metadata.

validate_css

Parse supplied CSS for syntax errors inside the Worker.

validate_html

Validate raw HTML markup already supplied in the conversation.

validate_schema_markup

Check JSON-LD blocks in supplied HTML for JSON syntax errors.

Tool change history

Compared across complete checks of the same configuration. Tools were listed, not invoked. Input-schema changes are not measured here.

No complete tool checks yet.

FAQ

Questions about MCP Web Validator MCP Server

How do I connect MCP Web Validator MCP Server to Claude?
Run `claude mcp add mcp-web-validator -- npx -y mcp-web-validator` in Claude Code, or add the same command and arguments under mcpServers in Cursor's mcp.json or Claude Desktop's claude_desktop_config.json, then restart the client. The blocks above are ready to paste.
Is MCP Web Validator MCP Server free?
The listed licence is MIT. Check the upstream terms for permitted use and commercial requirements; a public repository does not by itself mean the software is free or open source. Connected APIs and hosted services may have separate charges.
What can MCP Web Validator MCP Server do?
MCP Web Validator MCP Server documents 16 tools to the agent, including audit_public_site, audit_public_webpage, audit_seo_metadata. The descriptions above come from project documentation. A live handshake does not test individual tool behavior.