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Search and read web standards from WHATWG, IETF, W3C, MDN, Can I Use, WPT, Node.js, and TypeScript via remote Cloudflare Workers.
Do not connect
A critical issue was found. Do not connect this server as-is.
Scanned 1 month ago Due for re-check
A server can change after it's graded. Re-run the automated scan to refresh this report.
This grade is deterministic and reproducible: the same server surface always yields the same grade under a given algorithm version. It is a real automated assessment computed by the MCPGrade engine from what the probe actually observed — not a fabricated or opinion score. It is not a manual human pentest, so it can miss context-specific risks.
Every signal below was measured directly by the automated probe. The grade is derived only from evidence like this — nothing is assumed.
The whatwg-spec-mcp MCP server exposes 7 tools, focused primarily on general-purpose capabilities. Its published description reads: "Search and read web standards from WHATWG, IETF, W3C, MDN, Can I Use, WPT, Node.js, and TypeScript via remote Cloudflare Workers". It communicates over Streamable HTTP using the 2025-06-18 protocol revision, and does not require authorization to connect. MCPGrade currently rates whatwg-spec-mcp F — a critical issue was found and the server should not be connected as-is. Its most notable findings include "Cross-tool shadowing" and "Cross-tool shadowing". This report is a deterministic, reproducible automated assessment: the same observed surface always yields the same grade under a given algorithm version, and it is refreshed as new scans arrive and free to read — but it is not a substitute for a manual human security review. Always re-check whatwg-spec-mcp's advertised tools, transport security, and authorization posture before connecting an autonomous agent or sharing sensitive context with it.
Add whatwg-spec-mcp to an MCP client using the endpoint below. Review the grade and findings above before granting an autonomous agent access.
MCP endpoint
https://whatwg-spec-mcp.jasnell.workers.dev/mcpStreamable HTTP transport. This is the MCP endpoint, not a website — paste it into your MCP client server list rather than a browser.
Captured passively during the read-only scan. Click any value to find servers that match it.
The tools this server advertises via tools/list — names, purposes, and the parameters each accepts, exactly as enumerated read-only.
List all WHATWG living standards with their name, description, and URL. Optionally filter by a search term. Examples: - list_standards() — list all 22 standards - list_standards(search="networking") —
Search for sections across ALL WHATWG standards at once. Useful when you don't know which standard defines a particular concept or API. For example: "structuredClone", "AbortSignal", "EventTarget", "R
Search within a specific WHATWG standard for sections by title, ID, section number, or concept. Returns matching section titles, IDs, and URLs. If you don't know which standard to search, use `search_
Sorted worst-first. Each finding shows its severity, what it means, its OWASP MCP Top-10 mapping, and a recommended fix — the check id links to the exact methodology row that produced it.
tool: search_all_standards
A tool description tries to alter the model’s use of another tool.
belong to. Use `search_standard` instead if you already know which standard toRecommendationDescriptions must describe only their own tool.
tool: search_standard
A tool description tries to alter the model’s use of another tool.
to search, use `search_all_standards` instead. Examples: - search_standard(standardRecommendationDescriptions must describe only their own tool.
tool: search_spec_content
A tool description tries to alter the model’s use of another tool.
content. Unlike search_standard which only matches section headings, this searcRecommendationDescriptions must describe only their own tool.
tool: get_standard_section
A tool description tries to alter the model’s use of another tool.
preserved. Use search_standard first to find the correct section ID. ExamplesRecommendationDescriptions must describe only their own tool.
The server accepts tool enumeration (and likely invocation) with no authentication.
RecommendationRequire OAuth 2.1 authorization for any server exposing non-public tools.
Vantaj uptime monitoring via MCP — manage monitors, heartbeats, incidents, and status pages.
Unified gateway to Algeria's TKAWEN ecosystem: commerce, certification, and AI tools.
Provides access to the Cohereon Doctrine AI safety framework with governance components, tiered access, and agent onboarding.
Agentic rails for complex workflows with receipts, fees, and MCP tool access.
Structural TC39 spec lookup for ECMA-262 and ECMA-402 in AI agents, SHA-pinned and offline-first.
Structural TC39 spec lookup for ECMA-262 and ECMA-402 in AI agents, SHA-pinned and offline-first.
Full-text search within a WHATWG standard's content. Unlike search_standard which only matches section headings, this searches the actual body text of the spec. Useful for finding where a specific ter
Fetch the table of contents for a specific WHATWG standard, listing all sections with their numbers, titles, and IDs. Useful for browsing the structure of a standard before reading specific sections.
Fetch the full content of a specific section from a WHATWG standard. Returns the section text converted to simplified markdown with headings, algorithm steps, and cross-references preserved. Use searc
Search open and closed GitHub issues and pull requests across WHATWG specification repositories. Useful for finding discussions, bug reports, feature requests, and in-progress spec changes. Examples: