CONF-016: Deprecated logging capability is declared

Severity	Applies to	Spec section
warn	modern era, stdio, http	2026-07-28/deprecated#deprecated

Reads the capabilities from server/discover. Logging is deprecated as of 2026-07-28 (SEP-2577) and new implementations SHOULD NOT adopt it. Roots and sampling are also deprecated; they are client features and are checked when the MRTR checks land.

From the command line: mcpprobe checks explain CONF-016. To leave it out of a run, add "CONF-016" to [checks] disable in mcpprobe.toml; to change how much it counts, use severity_overrides.