What is MCP (Model Context Protocol)?

MCP -- Model Context Protocol -- is an open standard created by Anthropic that lets AI tools connect to external services and data sources. Think of it like USB for AI: a universal way for AI assistants to plug into tools, databases, APIs, and files without custom integrations for each one. Before MCP, every AI tool had its own way of accessing external data, which meant developers had to build separate plugins for each platform. MCP replaces that fragmentation with a single protocol that any AI tool can support.

In practice, MCP works through "servers" -- small programs that expose specific capabilities to AI tools. An MCP server might give Claude access to your GitHub repos, your Slack messages, your database, or your prompt library. The AI tool (called the "client") discovers what the server can do and uses those capabilities naturally in conversation. You do not need to copy-paste data or switch between tabs -- the AI can read, write, and search external systems directly.

MCP is already supported by Claude (desktop app and Claude Code), Cursor, Windsurf, and a growing number of AI tools. PromptingBox publishes an MCP server that lets you save, search, and retrieve your prompts from inside any MCP-compatible AI tool. Install it with a single npx command and your entire prompt library becomes accessible wherever you work.