Why architecture matters here

MCP logging fails on spam (no throttle), PII leak, and missing level control. Architecture matters because level + rate + sink policy shape usefulness.

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The architecture: every piece explained

The top strip is the flow. MCP server. logging/setLevel. notifications/message. Level enum.

The middle row is quality. Sink at client. Structured payload. Rate + throttling. Correlation.

The lower rows are governance. PII scrubbing. Retention. Ops — governance + privacy + audit.

MCP logging — logging/setLevel + notifications/message + client sinks + level policyserver-produced logs to the hostMCP serverproduces log lineslogging/setLevelclient-set thresholdnotifications/messageserver → clientLevel enumdebug / info / warn / error / etcSink at clientUI console / store / forwardStructured payloadlevel + logger + dataRate + throttlingavoid floodCorrelationwith tools + resourcesPII scrubbingserver-sideRetention (client)policy per hostOps — governance + privacy + auditconsumestructurethrottlecorrelatescrubretainretainoperateoperate
MCP logging pipeline: server → notifications → client sinks.
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End-to-end flow

End-to-end: client calls logging/setLevel=info. Server emits info + warn + error messages. Structured payloads land at client console. High burst triggers throttle. PII scrubbed server-side. Correlation with tool events.