Web Accessibility-Testing MCP Server (A11y MCP)

@ronantakizawa

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Basic information

About Web Accessibility-Testing MCP Server

MCP Server for Web Accessibility Testing (10k+ Downloads, #20 on ProductHunt)

#mcp #a11y#a11y-testing#accessibility-testing

Web Accessibility-Testing MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "a11y-accessibility": {
      "command": "npx",
      "args": [
        "-y",
        "a11y-mcp-server"
      ]
    }
  }
}

Web Accessibility-Testing MCP Server tools

Test a webpage for accessibility issues using Axe-core

Test an HTML string for accessibility issues

Get information about available accessibility rules with optional filtering

Check if a foreground and background color combination meets WCAG contrast requirements

Check if ARIA attributes are used correctly in HTML

Check if content forces a specific orientation

Overview

What is Web Accessibility-Testing MCP Server (A11y MCP)?

An MCP (Model Context Protocol) server that gives LLMs access to web accessibility testing APIs. It uses the Deque Axe-core API and Puppeteer to analyze web content for WCAG compliance and identify accessibility issues.

How to use Web Accessibility-Testing MCP Server (A11y MCP)?

Install Node.js 18 or later, then configure the server in your MCP-compatible client (e.g., Claude Desktop, Claude Code, VS Code, Cursor, Windsurf) by adding "command": "npx", "args": ["-y", "a11y-mcp-server"] to the client's MCP configuration.

Key features of Web Accessibility-Testing MCP Server (A11y MCP)

Test any public URL for accessibility issues.
Test raw HTML strings for accessibility issues.
Check content against WCAG 2.0, 2.1, and 2.2 standards.
Explore and filter available accessibility rules.
Analyze color combinations for WCAG contrast compliance.
Validate correct usage of ARIA attributes.
Detect content that forces specific screen orientations.

Use cases of Web Accessibility-Testing MCP Server (A11y MCP)

Audit a live web page for WCAG 2.1 AA violations during development.
Check an HTML snippet for accessibility issues before deploying.
Verify color contrast ratios meet WCAG thresholds using an LLM.
Validate ARIA attribute usage in dynamically generated HTML.
Test how content behaves across desktop and mobile viewport sizes.

Frequently asked questions

What runtime does the server require?

Node.js 18 or later.

Which clients can I use with this server?

Any MCP-compatible client, including Claude Desktop, Claude Code, VS Code, Cursor, and Windsurf.

Does the server send data to an external service?

No. Testing is performed locally by the server using Puppeteer and the Axe-core library.

What accessibility standards are supported?

WCAG 2.0 (Levels A, AA, AAA), WCAG 2.1 (Levels A, AA), WCAG 2.2 Level AA, and best-practice rules.

Is this an official Deque Labs product?

No. This is not an official MCP server from Deque Labs.

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