upstash/context7: 49K-Star MCP Server Injecting Live Library Documentation Into LLM Context at Code Time

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Context7, built by Upstash, is an MCP server that resolves the stale-docs problem by injecting current, version-accurate library documentation directly into LLM context windows — preventing hallucinated deprecated APIs during vibe coding sessions. At 49.4K stars with mcp-server and vibe-coding topic tags, it's one of the most-starred MCP servers in existence and integrates as a drop-in context source for Claude Code, Cursor, and other coding environments. The scale signals that documentation grounding has become a first-class infrastructure concern for AI coding.