specification.website
Website specification — HTML, accessibility, security, SEO, agent-readiness. Platform-agnostic, sourced, MIT.
The specification.website MCP server provides AI agents with programmatic access to a comprehensive, platform-agnostic web standards specification covering HTML, accessibility, SEO, security, and agent-readiness requirements. Developed by Joost de Valk, this server exposes curated technical specifications drawn from WHATWG, W3C, IETF, and other authoritative sources through the Model Context Protocol. It enables agents to retrieve standardized web development guidelines and best practices without needing to parse multiple documentation sources. The server is deployed on Cloudflare Workers and released under the MIT license.
Key Features
Use Cases
- 01AI coding assistants validating website implementations against web standards during development
- 02Agents checking HTML document structure and metadata requirements for compliance
- 03Automated accessibility audits referencing WCAG-aligned specifications
- 04SEO optimization tasks requiring current search engine and schema.org guidelines
- 05Security header configuration verification against IETF RFC standards
- 06Agent-readiness evaluation for websites being prepared for AI consumption
Related MCP Servers
View moremarkitdown
Python tool for converting files and office documents to Markdown.
firecrawl
The context API to search, scrape, and interact with the web at scale. 🔥
prompts.chat
f.k.a. Awesome ChatGPT Prompts. Share, discover, and collect prompts from the community. Free and open source — self-host for your organization with complete privacy.
langflow
Langflow is a powerful tool for building and deploying AI-powered agents and workflows.
specification.website — FAQ
What is the specification.website MCP server?+
It's an MCP server that gives AI agents access to a comprehensive, platform-agnostic web standards specification covering HTML, accessibility, SEO, security, and more. Every specification is sourced from authoritative bodies like WHATWG, W3C, and IETF.
How do I install the specification.website MCP server?+
The server is deployed as a public Cloudflare Worker endpoint, so you configure your MCP client to connect to the remote server rather than installing it locally. Check the mcp/README.md in the repository for the exact connection configuration.
Which AI clients work with this MCP server?+
Any MCP-compatible client can connect to it, including Claude Desktop and other applications that support the Model Context Protocol.
Do I need API keys to use specification.website?+
No API keys are required. The MCP server is publicly accessible at mcp.specification.website/mcp.
Is the specification.website MCP server free to use?+
Yes, it's completely free and open-source. The content is licensed under CC BY 4.0 and the code under MIT.
Can I run my own instance of the MCP server?+
Yes, the repository includes the full source code in the mcp/ directory with deployment instructions for running your own Cloudflare Worker instance.
How do I install specification.website?+
Open the source repository on GitHub and follow its README. specification.website is a mcp server — MCP Agents Market links you directly to the official repo.
Is specification.website free?+
specification.website is an open-source project hosted on GitHub. Check the repository for its license and any usage requirements.