MCP Accessibility Scanner
Enables automated web accessibility scans for WCAG compliance using Playwright and Axe-core, providing visual and JSON reports with remediation guidance.
What is MCP Accessibility Scanner?
MCP Accessibility Scanner is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to enables automated web accessibility scans for wcag compliance using playwright and axe-core, providing visual and json reports with remediation guidance.
Enables automated web accessibility scans for WCAG compliance using Playwright and Axe-core, providing visual and JSON reports with remediation guidance.
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- Enables automated web accessibility scans for WCAG complianc
Use Cases
Maintainer
Works with
Installation
NPM
npx -y mcp-accessibility-scannerManual Installation
npx -y mcp-accessibility-scannerConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use MCP Accessibility Scanner
MCP Accessibility Scanner is a TypeScript MCP server that automates WCAG compliance testing for web pages and entire sites using Playwright for browser automation and Axe-core as the accessibility rules engine. It exposes tools for single-page scans, full site audits, responsive viewport matrix testing, and keyboard navigation auditing, and can generate both visual and JSON reports with remediation guidance. Developers and QA engineers can integrate it into their AI-assisted workflow to catch WCAG 2.0, 2.1, and 2.2 violations—including contrast issues, missing labels, and keyboard traps—without leaving their AI client.
Prerequisites
- Node.js 18 or later installed
- A Chromium-based browser available (the scanner defaults to headless Chromium via Playwright)
- An MCP-compatible client such as Claude Desktop, Claude Code, or VS Code with MCP support
- Network access to the URLs you intend to scan
Install the package globally (optional) or use npx
You can install the package globally for repeated use or let npx fetch it on demand each time the MCP server starts.
# Install globally:
npm install -g mcp-accessibility-scanner
# Or use npx without installing:
npx -y mcp-accessibility-scannerInstall Playwright browser dependencies
Playwright requires browser binaries. Run the install command once after installing the package.
npx playwright install chromiumAdd the server to your MCP client config
Register the server in your claude_desktop_config.json (Claude Desktop) or equivalent client config file.
{
"mcpServers": {
"accessibility-scanner": {
"command": "npx",
"args": ["-y", "mcp-accessibility-scanner"]
}
}
}Optionally add a custom config file for browser and timeout settings
Create a JSON config file to customize browser launch options, timeouts, and network filtering. Pass it with the --config flag.
{
"browser": {
"browserName": "chromium",
"launchOptions": {
"headless": true,
"channel": "chrome"
}
},
"timeouts": {
"navigationTimeout": 60000,
"defaultTimeout": 5000
}
}Add the server via Claude Code CLI (Docker alternative)
If you prefer to run the scanner in a Docker container to avoid local Node.js dependencies, use the Claude Code CLI to add it.
claude mcp add mcp-accessibility-scanner -s user -- docker run -i --rm justasmonkev/mcp-accessibility-scannerRestart your MCP client and verify the tools are available
Restart Claude Desktop or reload your MCP client. Ask it to list available accessibility tools to confirm the server is connected.
MCP Accessibility Scanner Examples
Client configuration
Standard claude_desktop_config.json entry using npx to run the accessibility scanner.
{
"mcpServers": {
"accessibility-scanner": {
"command": "npx",
"args": ["-y", "mcp-accessibility-scanner"]
}
}
}Prompts to try
Use natural language to trigger accessibility scans. The server supports single pages, full sites, viewport matrices, and keyboard navigation audits.
- "Scan https://example.com for WCAG 2.1 AA accessibility violations and give me a summary"
- "Run a full site audit on https://myapp.com starting from the homepage"
- "Test https://myapp.com/login on mobile, tablet, and desktop viewport sizes for accessibility issues"
- "Audit keyboard navigation on https://myapp.com and check for focus traps"
- "Navigate to https://example.com and run a scan_page check for wcag21aa violations"Troubleshooting MCP Accessibility Scanner
Playwright cannot find Chromium: 'Executable doesn't exist at ...'
Run `npx playwright install chromium` in your terminal (or inside the project directory if using a local install). This downloads the Chromium binary that Playwright needs.
Scan hangs or times out on pages with heavy JavaScript
Increase the navigationTimeout in a custom config file (e.g. set it to 120000 ms) and pass it via --config flag. Some single-page applications need extra time to fully render before Axe-core can inspect the DOM.
No violations reported for a page that visually appears inaccessible
Axe-core can only detect automatically verifiable violations. Some issues (e.g. inappropriate alt text meaning, logical heading order) require human judgment. Use the scan as a first pass and follow up with manual testing for WCAG success criteria that cannot be auto-detected.
Frequently Asked Questions about MCP Accessibility Scanner
What is MCP Accessibility Scanner?
MCP Accessibility Scanner is a Model Context Protocol (MCP) server that enables automated web accessibility scans for wcag compliance using playwright and axe-core, providing visual and json reports with remediation guidance. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install MCP Accessibility Scanner?
Install via npm with the command: npx -y mcp-accessibility-scanner. Then add the server configuration to your AI client's JSON config file (e.g., claude_desktop_config.json or .cursor/mcp.json).
Which AI clients work with MCP Accessibility Scanner?
MCP Accessibility Scanner works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is MCP Accessibility Scanner free to use?
Yes, MCP Accessibility Scanner is open source and available under the MIT License license. You can use it freely in both personal and commercial projects.
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