MCP server

W3c

io.github.pipeworx-io/w3c

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

W3C MCP — web-standards lookup over w3c/browser-specs (GitHub, CF-reachable).

Working at last checkOfficial: pipeworx.io's GitHub account (pipeworx-io)About 26,703 tokens per request once connected44 tools

https://gateway.pipeworx.io/w3c/mcp

At a glance

Type: MCP server
Publisher: pipeworx.io (verified by the MCP Registry)
Status: Working at last check
Tools: 44
Token cost: About 26,703 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http w3c https://gateway.pipeworx.io/w3c/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.w3c]
url = "https://gateway.pipeworx.io/w3c/mcp"

Gemini CLI

{"mcpServers":{"w3c":{"httpUrl":"https://gateway.pipeworx.io/w3c/mcp"}}}

Cursor

{"mcpServers":{"w3c":{"url":"https://gateway.pipeworx.io/w3c/mcp"}}}

VS Code

{"servers":{"w3c":{"type":"http","url":"https://gateway.pipeworx.io/w3c/mcp"}}}

Antigravity

agy mcp add w3c https://gateway.pipeworx.io/w3c/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"w3c","server_url":"https://gateway.pipeworx.io/w3c/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"w3c","server_url":"https://gateway.pipeworx.io/w3c/mcp"}

w3c_search ~244 tokens
Find W3C / web-standards specifications by keyword or topic — HTML, CSS, WCAG accessibility, DOM, SVG, WAI-ARIA, WebAuthn, Fetch, and 800+ others. Answers "what W3C spec defines X", "the CSS grid specification", "web accessibility standard", "which spec covers custom elements". Returns specs with sh
w3c_spec ~156 tokens
Detail for one web-standards spec by shortname ("WCAG21", "css-grid-1", "html") or title fragment ("web content accessibility"). Returns title, status, organization (W3C/WHATWG), working groups, series, official URL, editor's-draft URL. Example: w3c_spec({ spec: "WCAG21" }). Accepts shortname/name/t

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