What is a11ymcp?
a11ymcp is a MCP server by ronantakizawa that test URLs and HTML for WCAG 2.0/2.1/2.2 compliance using axe-core, including color contrast, ARIA validation and orientation lock detection. It is listed under Developer tools and has 93 GitHub stars.
| Type | Mcp server |
|---|---|
| Author | ronantakizawa |
| Repository | ronantakizawa/a11ymcp |
| Popularity | 93 GitHub stars |
| Category | Developer tools |
| Security | Low risk (96/100) |
| Rank | #609 of 4,418 MCP servers; #156 in Developer tools |
| License | MIT |
| Last commit | 2026-03-10 |
| Runs | Locally |
| Language | TypeScript |
Is a11ymcp safe to install?
a11ymcp scores 96/100 on the MCPMods security check: Low risk. No checks raised a concern. It passed 5 of 6 checks.
MCP server results come from listing signals: who publishes it, where your data goes and what it can do. The code itself is not scanned yet.
| Check | Result |
|---|---|
| Community-built server | Note |
| Runs on your machine only | Pass |
| No credentials mentioned | Pass |
| Read-only by description | Pass |
| No code execution | Pass |
| Source on GitHub | Pass |
How do I install a11ymcp?
- Find the launch command. The README says how the server starts (npx, uvx, docker or a remote URL) and which API keys it needs.
https://github.com/ronantakizawa/a11ymcp
- Add it to Claude Code. Replace the part after -- with the command from the README. Remote servers use --transport http with a URL.
claude mcp add a11ymcp -- <command from README> claude mcp add --transport http a11ymcp <server-url>
- Check it connected. This lists your MCP servers and their status.
claude mcp list
Or ask Claude to set it up
Paste this into Claude Code and it installs a11ymcp for you:
Add the "a11ymcp" MCP server from https://github.com/ronantakizawa/a11ymcp to Claude Code. Read its README for the launch command and any API keys I need, run claude mcp add, then check that it connects.