The purpose of the Liquibase SDK is facilitate development and testing of the Liquibase codebase and Liquibase extensions. The Liquibase SDK ships with the standard command line Liquibase installation which can be downloaded from the Liquibase download page.
After unzipping liquibase-bin.zip or liquibase-bin.tar.gz you will find an “sdk” sub directory which contains everything related to the SDK.
Liquibase SDK is available in Liquibase 3.2.0+