A notification service may act as an intermediary between one or more sources of text-based communications and intended recipients of action items contained in the communications. The notification service may analyze the messages posted to the source(s) to identify action items, determine multiple response options for each identified action item, generate structured notification messages including the response options for the action items and send them to the respective intended recipient users, and upon receipt of a user response that specifies a selected response option, automatically perform the associated action(s).