About
Alt text, headings, contrast, ARIA for AI agents
Security Report
Valid MCP server (2 strong, 4 medium validity signals). 3 known CVEs in dependencies (0 critical, 3 high severity) Package registry verified. Imported from the Official MCP Registry.
8 files analyzed · 4 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-rog0x-a11y": {
"args": [
"-y",
"@rog0x/mcp-a11y-tools"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
mcp-a11y-tools
Web accessibility analysis tools for AI agents, served over the Model Context Protocol (MCP).
Tools
check_alt_text
Analyze images in HTML for missing, empty, or low-quality alt text.
- Detects missing
altattributes - Identifies decorative images (
alt=""withrole="presentation") - Flags low-quality alt text (e.g., "image", "photo", filenames)
- Checks linked images,
<input type="image">, and<area>elements
check_heading_hierarchy
Validate heading structure for proper nesting and content quality.
- Verifies h1-h6 order with no skipped levels
- Ensures a single
<h1>per page - Detects empty, too-short, or too-long headings
- Supports
role="heading"witharia-level - Returns a visual tree of the heading outline
check_color_contrast
Check WCAG 2.x contrast ratio for foreground/background color pairs.
- Calculates precise contrast ratio per WCAG relative luminance formula
- Reports AA and AAA compliance for normal and large text
- Accepts hex (
#fff,#ffffff),rgb(r,g,b), and named colors
validate_aria
Validate ARIA attributes on HTML elements.
- Detects invalid ARIA roles
- Checks for missing required ARIA properties per role
- Flags redundant ARIA roles that match native semantics
- Warns about
aria-labelon non-interactive elements - Catches
aria-hidden="true"on focusable elements
check_form_accessibility
Audit form elements for accessibility compliance.
- Verifies every input has an associated label (explicit, implicit, or ARIA)
- Checks radio/checkbox groups for
<fieldset>and<legend> - Flags placeholder text used as the only label
- Suggests
autocompleteattributes for personal info fields - Detects duplicate IDs that break label association
Setup
npm install
npm run build
Usage with Claude Desktop
Add to your claude_desktop_config.json:
{
"mcpServers": {
"a11y-tools": {
"command": "node",
"args": ["D:/products/mcp-servers/mcp-a11y-tools/dist/index.js"]
}
}
}
License
MIT
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