Check a library for compliance to the KLC:
../kicad-library-utils/schlib/checklib.py library/silabs.lib
Check with extra reporting which gives a human readable description of the issues:
../kicad-library-utils/schlib/checklib.py --enable-extra -v library/silabs.lib
Show super detailed information about a single part's vilations, with recommendations on how to fix:
../kicad-library-utils/schlib/checklib.py --enable-extra -vv library/silabs.lib -c CP2112