Host, client, and server

Learn 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.

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Visual

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Rename the boxes

1. Take a diagram that only shows product logos.
2. Replace each logo with host, client, or server.
3. If you cannot, you do not have the architecture yet.

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Quiz

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Ecosystem

Host

The application a person is actually using.

Sisters: Plugins, Function calling, Language-server ideas.

A notes server can serve chat and a voice host if both speak the same protocol.

Treat the spec revision as something you pin, like a model id.

Config

• Write the goal in one sentence.
• Name the input and the allowed output.
• Save the trace next to the result.

Troubleshooting

• The answer looks fluent and is wrong. Check whether a source passage actually contains the claim.
• The loop never stops. Set a step cap and stop when the tool result repeats.

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