The authors discuss RNPLS&T organizational and technological ap proaches toward designing “Methodological chatbot for libraries”. They substantiate the relevance of chatbot as a digital service intended to develop diverse professional competences. The system of building library professional competences is multicomponent, multilevel and polythematic, including using and designing various automated interaction systems. The authors suggest which library competences can be built with methodological chatbot, i. e. the basic, event-driven, analytical, digital, and technological. Correspondingly the RNPLS&T’s chatbot architecture was structured and designed, and further trial and implementation took place. The authors describe the functionality of the virtual assistant, its target audience, architecture, navigation system and content oriented toward logical algorithms of librarians’ queries. The functions of the methodological chatbot (educational, navigational, corrective, controlling) can be detailed based on the subject matter. The authors substantiate the choice of Telegram for the methodological and programming decisions and of @BotFather and @Manybot and their basic functionality. They demonstrate the structure hierarchy of the chatbot and content navigation sequence.