# Web Validator by DigestSEO (npm · mcp-web-validator)

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

- Trust score: 83/100 (high trust)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-21

## Components

- remote · `web-validator-mcp.digestseo.com`: 73/100, [markdown](https://verifymcp.io/servers/akzar1el-mcp-web-validator/web-validator-mcp.md), [page](https://verifymcp.io/servers/akzar1el-mcp-web-validator/web-validator-mcp)
- npm · `mcp-web-validator`: 83/100 (this document), [markdown](https://verifymcp.io/servers/akzar1el-mcp-web-validator/mcp-web-validator.md), [page](https://verifymcp.io/servers/akzar1el-mcp-web-validator/mcp-web-validator)

## Channel facts

- Registry: `npm`
- Package: `mcp-web-validator`
- Version: `1.3.7`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-21.

- **Supply Chain Security**: 99/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 37 of 141 dependencies flagged as unhealthy (1 deprecated).
- **Provenance & Transparency**: 100/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to AKzar1el/mcp-web-validator).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 0 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 80/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 636 tokens (~79/item across 8 items; 8 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Web Validator by DigestSEO MCP server?

Web Validator by DigestSEO runs locally as an npm package, launched with npx -y mcp-web-validator. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add akzar1el-mcp-web-validator -- npx -y mcp-web-validator
```

### Cursor

```json
{
  "mcpServers": {
    "akzar1el-mcp-web-validator": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-web-validator"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "akzar1el-mcp-web-validator": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-web-validator"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add akzar1el-mcp-web-validator -- npx -y mcp-web-validator
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "akzar1el-mcp-web-validator": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "mcp-web-validator"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add akzar1el-mcp-web-validator --command npx --arg -y --arg mcp-web-validator
```

### Hermes

```yaml
mcp_servers:
  akzar1el-mcp-web-validator:
    command: "npx"
    args: ["-y", "mcp-web-validator"]
```

### Netclaw

```json
{
  "McpServers": {
    "akzar1el-mcp-web-validator": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "mcp-web-validator"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add akzar1el-mcp-web-validator -t stdio -c npx -a -y mcp-web-validator
```

### Other

```json
{
  "mcpServers": {
    "akzar1el-mcp-web-validator": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-web-validator"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-21 (score 83, +1)

- [security regression] Tool safety: pass → unverified
- [security] Stability: Stability not yet verified: we do not have a sandbox capture of the MCP schema this version of the package serves yet.
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional improvement] Stability: unverified → 0.03
- [functional] First check of Schema quality: unverified
- [functional] Package version: 1.3.5 → 1.3.7

### 2026-09-20 (score 82)

First indexed and scored.

## MCP tools (8)

### `html.local` (~54 tokens)

Validate local HTML

Reads a bounded local HTML file and sends its markup to the W3C Nu HTML Checker. Use only files the user is authorized to share.

Input parameters:

- `filePath` (string, required): Absolute or workspace-relative path to an HTML file.

Output parameters:

- `error` (string)
- `errors` (array)

### `html.url` (~65 tokens)

Validate a public URL

Fetches a bounded public HTTP(S) page, then sends its markup to the W3C Nu HTML Checker. Private, reserved, credentialed, and nonstandard-port destinations are rejected.

Input parameters:

- `url` (string, required): Public HTTP(S) URL on port 80 or 443.

Output parameters:

- `error` (string)
- `errors` (array)
- `fetchedUrl` (string)

### `css.local` (~54 tokens)

Validate local CSS

Reads a bounded local CSS file and sends it to the W3C Jigsaw CSS Validator. Use only files the user is authorized to share.

Input parameters:

- `filePath` (string, required): Absolute or workspace-relative path to a CSS file.

Output parameters:

- `error` (string)
- `errors` (array)

### `seo.metadata` (~45 tokens)

Audit SEO metadata

Analyzes supplied HTML locally for metadata, heading structure, viewport configuration, image alternatives, and Open Graph fields.

Input parameters:

- `htmlContent` (string, required): Raw HTML markup to inspect locally.

Output parameters:

- `error` (string)
- `issues` (array)
- `totalIssues` (integer)
- `truncated` (boolean)

### `links.broken` (~100 tokens)

Check public links

Resolves and checks up to 25 public HTTP(S) links in supplied HTML. Redirects are reported but not followed, and response bodies are discarded.

Input parameters:

- `baseUrl` (string): Optional public HTTP(S) base URL used to resolve relative links.
- `htmlContent` (string, required): Raw HTML markup containing links to check.
- `maxLinks` (integer): Maximum number of public HTTP(S) links to check, from 1 to 25.

Output parameters:

- `error` (string)
- `links` (array)

### `schema.markup` (~50 tokens)

Validate JSON-LD syntax

Parses JSON-LD blocks in supplied HTML locally and reports empty blocks or JSON syntax errors. It does not validate vocabulary semantics.

Input parameters:

- `htmlContent` (string, required): Raw HTML containing JSON-LD script blocks.

Output parameters:

- `error` (string)
- `issues` (array)
- `totalIssues` (integer)
- `truncated` (boolean)

### `report.validation` (~96 tokens)

Generate a validation report

Combines W3C HTML/CSS validation, local SEO/accessibility checks, JSON-LD syntax checks, and a bounded public-link check into a Markdown and structured report.

Input parameters:

- `baseUrl` (string): Optional public HTTP(S) base URL used to resolve relative links.
- `cssFilePath` (string): Optional absolute or workspace-relative CSS file path.
- `htmlFilePath` (string, required): Absolute or workspace-relative HTML file path.

Output parameters:

- `cssMessages` (array)
- `errors` (array)
- `failedChecks` (array)
- `htmlMessages` (array)
- `links` (array)
- `report` (string)
- `schemaIssues` (array)
- `seoIssues` (array)
- `summary` (object)

### `screenshot.capture` (~112 tokens)

Capture responsive screenshots

Renders a local HTML file or HTTP(S) URL in a sandboxed local Chromium browser and writes PNG screenshots to the requested directory. Downloads the pinned headless browser on first use if it is not already cached. Existing matching files may be replaced.

Input parameters:

- `outputDir` (string): Directory where PNG screenshots will be written.
- `targetPath` (string, required): Local HTML path or HTTP(S) URL to render.
- `viewports` (array): Optional viewport definitions; defaults to desktop, tablet, and mobile sizes.

Output parameters:

- `error` (string)
- `outputDirectory` (string)
- `screenshots` (array)

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/akzar1el-mcp-web-validator/mcp-web-validator#diagnostics

## Score history

- 2026-09-21: 83
- 2026-09-20: 82

## Common questions

### What is the Web Validator by DigestSEO MCP server?

Web Validator by DigestSEO is an MCP server listed in the public MCP registry as io.github.AKzar1el/mcp-web-validator. Audit public webpages and supplied markup for HTML, CSS, SEO, JSON-LD, and link issues. This page covers its npm package (mcp-web-validator).

### Is the Web Validator by DigestSEO MCP server safe to use?

Web Validator by DigestSEO scores 83 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 21 September 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Web Validator by DigestSEO MCP server expose?

Web Validator by DigestSEO exposes 8 tools: html.local, html.url, css.local, seo.metadata, links.broken, and 3 more. Their descriptions and schemas cost roughly 576 tokens of context every time the server is loaded.

### Is the Web Validator by DigestSEO MCP server still maintained?

Web Validator by DigestSEO is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Web Validator by DigestSEO MCP server under?

Web Validator by DigestSEO declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/mcp-web-validator
- Socket report: https://socket.dev/npm/package/mcp-web-validator
- Repository: https://github.com/AKzar1el/mcp-web-validator
- Website: https://digestseo.com/validator-mcp/
- Changelog RSS feed: https://verifymcp.io/servers/akzar1el-mcp-web-validator/mcp-web-validator.xml
- Changelog JSON feed: https://verifymcp.io/servers/akzar1el-mcp-web-validator/mcp-web-validator.json
- HTML version of this page: https://verifymcp.io/servers/akzar1el-mcp-web-validator/mcp-web-validator