6.1 — What is MCP? The universal AI-to-tools protocol
Until now, every AI tool had to build its own integrations with every external service. One AI client, ten tools: ten specific integrations, each with its own format, authentication, and limitations. Three AI clients, ten tools: thirty integrations. MCP -- Model Context Protocol -- eliminates this complexity.
MCP is an open, standardized protocol that defines how an AI assistant communicates with external tools. Think USB-C: a single universal connector. Each tool is implemented once as an MCP server, and every compatible AI client understands it natively. You go from N x M integrations to N + M.
The architecture is built on a client-server model. Claude Code acts as the **MCP clien