Context7 Reaches 55,202 Stars as the Most Popular MCP Server of 2026 — Injects Version-Specific Library Docs Into Any AI Coding Agent

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Upstash's Context7 MCP server has climbed to 55,202 GitHub stars by solving AI coding agents' hallucinated-documentation problem. It fetches version-specific code examples directly into the LLM context — ask for Next.js 14 middleware patterns and you get Next.js 14 docs, not 13 or 15. Works with Claude Code, Cursor, OpenCode, and any MCP-compatible client, free under MIT license with optional API key for higher rate limits.