This article is a refinement and expansion of the initial ideas regarding the possibility of interpose the “agravo de instrumento” in the Civil Procedure Code of 2015, in view of the innovation and taxativeness of its hypotheses. After the initial debates, the jurisprudence of the Courts advanced and defined some new directions for the topic. In this text, the ideas are centered on the possibility or not of filing this appeal in cases of decisions on jurisdiction and other matters that were not addressed by the legislator when the new Brazilian Civil Procedure Code was issued. The basis of the proposed update for the present work is centered on the fact that, in 2019, the Superior Court of Justice (STJ) attributed a new understanding to the resource under discussion, expanding the possibility of interposing it, as well as proposing great academic, doctrinal and jurisprudential debates on the topic.