MCP: lifecycle, capabilities, and trust boundaries
MCP separates host, clients, and servers; capability discovery does not remove authorization, validation, or trust boundaries.
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Video summary
The ideas to retain
1. Start with ownership: host, client, and server are not synonyms
The MCP architecture defines three distinct roles.[^mcp-architecture]
Host
The host is the AI application: an IDE, desktop app, chat interface, internal agent, or another product that embeds the model experience.
Client
An MCP client lives inside the host and has a 1:1 relationship with one particular server.[^mcp-architecture]
Key moments
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