"Top 10 repos" lists come and go — the categories endure. Each planet is a class of real Claude-ecosystem extension. Orbit, click, and assemble your own stack.
The Model Context Protocol (open-sourced by Anthropic in Nov 2024) is a standard plug socket between an AI model and the outside world. Instead of writing custom glue code for every tool — your database, GitHub, Slack, a browser — each tool exposes an MCP server, and any MCP-aware client (Claude Desktop, Claude Code, many IDEs) can use it instantly. One protocol, many tools: like USB-C for AI context.
The canonical starting point is Anthropic's reference repo modelcontextprotocol/servers, which ships servers for filesystem access, Git, fetch, memory, and more. A typical "productivity machine" setup layers: MCP servers (hands), prompt collections (instincts), an agent framework (nervous system), workflow templates (habits), and eval harnesses (report card). Repo popularity claims vary — treat any specific "top 10" ranking as a snapshot, not gospel.