Web Accessibility Testing MCP
A11y MCP is a Model Context Protocol server that enables AI language models to perform automated web accessibility testing by integrating with Deque's Axe-core API and Puppeteer to analyze web content for WCAG compliance.
https://github.com/ronantakizawa/a11ymcp?ref=producthunt
Product Information
Updated:Jan 15, 2026
What is Web Accessibility Testing MCP
Web Accessibility Testing MCP (A11y MCP) is an open-source tool that bridges the gap between AI language models and web accessibility testing capabilities. Built as a Model Context Protocol (MCP) server, it provides AI assistants with direct access to professional accessibility testing APIs and tools. The server leverages Deque's Axe-core API and Puppeteer to perform comprehensive accessibility audits on web pages and HTML content, ensuring compliance with Web Content Accessibility Guidelines (WCAG) standards 2.0, 2.1, and 2.2.
Key Features of Web Accessibility Testing MCP
Web Accessibility Testing MCP (A11y MCP) is a Model Context Protocol server that enables AI language models to perform automated accessibility testing on websites and HTML content. It integrates with Deque's Axe-core API and Puppeteer to analyze web content for WCAG compliance, check color contrast ratios, validate ARIA attributes, and identify accessibility issues while providing detailed reports and remediation guidance.
Comprehensive WCAG Testing: Tests content against multiple WCAG standards (2.0, 2.1, 2.2) and provides detailed violation reports with specific remediation recommendations
Flexible Testing Options: Supports testing both public URLs and raw HTML snippets, allowing developers to check accessibility at any stage of development
Advanced Color Analysis: Performs detailed color contrast analysis between foreground and background elements, considering font size and weight for WCAG compliance
ARIA Validation: Validates proper implementation of ARIA attributes and roles to ensure screen reader compatibility
Use Cases of Web Accessibility Testing MCP
Development Integration: Developers can integrate accessibility testing directly into their IDE workflow to catch issues early in the development process
Compliance Auditing: Organizations can perform automated accessibility audits of their websites to ensure compliance with accessibility standards and regulations
Content Management: Content creators can verify their HTML content meets accessibility requirements before publishing
Educational Tool: Teaching teams and students about web accessibility by providing immediate feedback on accessibility issues and how to fix them
Pros
Seamless integration with AI language models through MCP protocol
Provides detailed, actionable feedback with specific remediation steps
Supports multiple testing scenarios (URLs, HTML snippets) and standards
Cons
Requires local setup and configuration
Not an official tool from Deque Labs
Limited to static analysis without user interaction testing
How to Use Web Accessibility Testing MCP
Install and Configure MCP Settings: Edit the MCP settings file based on your OS: For macOS: '~/Library/Application Support/Claude/claude_desktop_config.json', For Windows: '%APPDATA%\Claude\settings\claude_mcp_settings.json', For Linux: '~/.config/Claude/settings/claude_mcp_settings.json'
Add Server Configuration: Add the following configuration to your MCP settings file: { "mcpServers": { "a11y-accessibility": { "command": "npx", "args": [ "-y", "a11y-mcp-server" ] } } }
Test URL Accessibility: Use the test_accessibility tool by providing a URL parameter: { "url": "https://example.com", "tags": ["wcag2aa"] }
Test HTML String: Use the test_html_string tool to test raw HTML content: { "html": "<div><img src='image.jpg'></div>", "tags": ["wcag2aa"] }
Check Color Contrast: Use check_color_contrast tool to verify WCAG contrast requirements: { "foreground": "#777777", "background": "#EEEEEE", "fontSize": 16, "isBold": false }
Validate ARIA Attributes: Test ARIA attribute usage with HTML content: { "html": "<div role='button' aria-pressed='false'>Click me</div>" }
Check Orientation Lock: Test for orientation lock issues in HTML content: { "html": "<html><head><meta name='viewport' content='width=device-width, orientation=portrait'></head><body>Content</body></html>" }
Review Test Results: Analyze the JSON response which includes violations, passes, incomplete tests, and detailed information about any accessibility issues found
Web Accessibility Testing MCP FAQs
A11y MCP is a Model Context Protocol (MCP) server that enables LLMs (Large Language Models) to perform web accessibility testing. It uses Deque Axe-core API and Puppeteer to analyze web content for WCAG compliance and identify accessibility issues.
Web Accessibility Testing MCP Video
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