What Is the Model Context Protocol? Hosts, Clients, Servers and the 2026-07-28 Spec
MCP is a JSON-RPC based protocol that lets you write tools and data sources once as a server and connect them to any AI application through a standard client. We watch the wire with hand-written JSON messages to see the host, client and server roles, the tools/resources/prompts primitives, the stdio and Streamable HTTP transports, and the 2026-07-28 revision that removed the handshake.
8 Nov 2026
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10 min
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7
