An assembly for hanging a tubular string includes a packoff (56) having a fastener and a seal for engaging an inner surface of the tubular string and a setting tool. The setting tool includes: a debris cap (84) for engaging an upper end of the tubular string, thereby forming a buffer chamber between the debris cap (84) and the packoff (56); a mandrel (66) having a port formed through a wall thereof; a piston (71): disposed along the mandrel, having an upper face in fluid communication with the port, and operable to stroke the debris cap relative to the mandrel, thereby setting a hanger of the tubular string; an actuator sleeve (71) extending along the mandrel and connected to the piston; a packer actuator (62) including a housing connected to the debris cap above the buffer chamber and a fastener for engaging a profile of the actuator sleeve; and a latch releasably connecting the housing to the mandrel.