A tool string disposable in a wellbore includes a plug configured to seal against an inner surface of a tubular string disposed in the wellbore, a setting tool coupled to the plug, including a housing including a central passage, a mandrel slidably disposed in the housing, wherein the mandrel includes an outer surface including a planar surface, and a piston coupled to the mandrel and including a central passage, wherein, in response to a pressurization of the central passage of the piston of the setting tool, the setting tool is configured to actuate the plug to seal against the inner surface of the tubular string.