Too Long; Didn't Read Act of 2018 or the TL; DR Act of 2018 This bill requires the Office of Management and Budget to develop and issue regulations that direct each federal agency to provide a clearly-marked section at the top of a communication (both hard copy and electronic) that the agency sends to an individual if such communication requires or authorizes such individual to take action. To the extent practicable, the clearly-marked section at the top of the first page shall include: the action item; if a response is required, optional, or not required; the deadline, if applicable; how to complete the action item; and the agency's contact information.