io.github.theodcrx/validatehtml
validatehtml
Is the io.github.theodcrx/validatehtml MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-14.
Validate HTML, CSS, JSON, XML and WCAG accessibility from an AI coding agent. No key needed.
alive probed 2026-11-14
- Run it
- npx -y validatehtml@0.1.0 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- validatehtml 0.1.0
- Capabilities
- tools
- Instructions
- none
- Of a 1M window
- 0.1 % of a 1M context window
- Count
- 1.1k tokens in Claude Opus 5.5, exact, measured 2026-11-14. With the Claude Code prefix mcp__…__ on each tool name: 1.2k. The o200k_base estimate is 683. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/theodcrx/validatehtml-cli
- Registry
- active, updated 2026-11-10 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.67×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| validate_file | 281 | 168 | 25 % |
| validate_code | 268 | 160 | 23 % |
| audit_page | 228 | 136 | 20 % |
| validate_url | 208 | 124 | 18 % |
| site_scan_link | 159 | 95 | 14 % |
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Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The server answers initialize and tools/list. Nothing to fix.