A hands-on walkthrough of the Model Context Protocol (MCP) using TypeScript code. Covers why MCP exists (reducing M*N LLM integration complexity to M+N), how a standalone MCP client and server communicate via JSON-RPC, and how an LLM (Claude) uses MCP tool capabilities to answer user queries. Includes a full ASCII flow diagram and real code snippets for server tool registration, client tool invocation, and LLM message processing with tool use.
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