T6-R2 in five minutes
The host is the application the person uses.
The client speaks the protocol inside that host.
The server offers tools, resources, or prompts.
One host can talk to more than one server.
A picture of logos is not an architecture. Name the roles.
A notes server does not know whether the host is a chat window or a voice session. It knows the request. That is the point of the split.
Sources and go deeper
- Model Context Protocol specification, 2025-06-18 spec last checked 2026-10
- What is the Model Context Protocol (MCP)? spec last checked 2026-10
- Model Context Protocol organization on GitHub community last checked 2026-10
- Model Context Protocol — Wikipedia wikipedia last checked 2026-10