A method and system for automatically supplying parts for an assembly line is provided. The method includes generating and executing an action plan specifying movements associated with a robotic apparatus associated with the assembly line, items required for the assembly line, and a vehicle associated with providing the items for the robotic apparatus. The vehicle is directed to a location comprising the items and a first item is selected and retrieved upon arriving at the location. A measured weight of the first item is compared to a predetermined maximum weight threshold for delivery by the vehicle and a resulting delivery process with respect to the vehicle, first item, and robotic apparatus is executed. A notification indicating details associated with the delivery process is transmitted to the robotic apparatus.