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DimensionMDN MCP ServerMDN's official experimental MCP server for web search, docs, and browser compatibility dataContext7Upstash's official server providing up-to-date third-party library docs for AI coding assistants
FMRS53 / 100 · D80 / 100 · B
Reliability8 / 2014 / 20
Security and permissions12 / 2016 / 20
Maintenance10 / 2017 / 20
Documentation11 / 2015 / 20
Setup experience12 / 2018 / 20
Best for
  • Web developers who need accurate, current web platform documentation
  • Coding agents aiming to reduce inaccuracies caused by outdated LLM training data
  • Developers using fast-moving frameworks/libraries worried about the AI suggesting stale code
  • Scenarios wanting zero-config documentation lookup
Not for
  • Users who require strict data-privacy guarantees and want no query logging whatsoever
  • Production workflows requiring a stable, guaranteed-uptime API, since this server is experimental and may be withdrawn at any time
  • Looking up internal/private codebase documentation (Context7 targets publicly published open-source libraries)
  • Cases needing very high coverage of obscure, niche libraries (coverage depends on what Context7's platform has indexed)
Required permissions
  • The server itself does not require access to local files or a codebase
  • Using the remote server sends query content to Mozilla's servers
  • Usable without an API key (subject to a free-tier rate limit); CONTEXT7_API_KEY is an optional credential for higher quota
  • Read-only documentation lookup — no code execution or local filesystem access involved
Risks and side effects
  • The README states that query data is stored for analytics; it is not linked to identifying user information, but private details a user shares with the LLM could inadvertently be included in logged queries
  • As an experimental project, the server may be withdrawn at any time, making it unsuitable for dependencies requiring long-term stability
  • Use of the remote server requires compliance with Mozilla's Acceptable Use Policy
  • The free tier has limited quota — high-frequency use may hit rate limits
  • Documentation content comes from Context7's platform index, so its accuracy and freshness depend on that platform's crawl cadence
Supported clientsClaude CodeClaude Code, VS Code, Cursor, Cline, Amp
Tools02