io.github.rog0x/a11y

mcp-a11y-tools

Is the io.github.rog0x/a11y MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-31.

Alt text, headings, contrast, ARIA for AI agents

alive probed 2026-11-14 · unchanged since 2026-10-31

5tools

958tokens in Claude Opus 5.5

0.5 %of Claude's 200k window

0.4×the median server

611 msto initialize

15 msto list tools

Run it: npx -y @rog0x/mcp-a11y-tools@1.0.2 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: mcp-a11y-tools 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 958 tokens in Claude Opus 5.5, exact, measured 2026-10-17. With the Claude Code prefix mcp__…__ on each tool name: 998. The o200k_base estimate is 526. Counted again when the tool definitions change. Method.
Repository: https://github.com/rog0x/mcp-a11y-tools
Registry: active, updated 2026-03-22 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.82×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
check_color_contrast	239	131	25 %
check_alt_text	186	102	19 %
check_form_accessibility	180	99	19 %
check_heading_hierarchy	177	97	18 %
validate_aria	177	97	18 %

Other registry entries on npmjs.com, the ones next to this name; all of them.

Servers that mention a11y.

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.