Tippecanoe does not read KML directly. You must convert it to GeoJSON first. You can use ogr2ogr (part of GDAL):
KML does not support multi-level tiling. You cannot easily show "less detail" when zoomed out and "more detail" when zoomed in without loading the whole file. The Advantages of MBTiles convert kml to mbtiles
If you want a static image layer:
Recommended flags: