Since the lack of data standards would limit the generality of test data, ISRM and the Commission on Testing Methods of ISRM promoted the data standardization of rock mechanics tests by establishing the Joint Working Group on Representing ISRM Suggested Methods in Electronic Form (RISMEF) in 2007. Prior to that, AGS had published the first edition of the interchange format in 1992 to achieve the similar goal. Therefore, the applicability of AGS format to represent the rock mechanics test data by using ISRM Suggested Methods is discussed in this paper. The hierarchy of how the AGS4 Groups are organized is reviewed. Based on the comparison of the AGS4 Rock Uniaxial Compressive Strength and Deformability Tests (RUCS) Group and the Uniaxial Compressive Test (UCT) results, the validity of using AGS4 to describe the UCT results is investigated. In addition, the AGS4 Groups which record the necessary data for Rock Mass Rating (RMR) system are analyzed. This study demonstrates that the AGS format can be extended to be in accordance with the ISRM Suggested Methods, and potentially used to standardize ISRM rock mechanics test data.