Edge probe diagnostics (EPDs) for the KSTAR consists of fixed Langmuir probe arrays, movable and reciprocating Langmuir probe assemblies. The probe array is designed to measure plasma basic parameters and their poloidal profiles in the plasma-surface interaction regions such as an inboard limiter and divertors. The movable and the reciprocating probe assemblies are designed to measure spatial profiles of plasma parameters in the scrape-off layer region and near the X point, respectively. In this work, the current engineering design activities for the KSTAR EPDs, and technical issues from sample fabrications and their performance tests are presented.