The build tools specifies the toolchain used to build Android projects. In Eclipse you can change which version is used with the project.properties file by specifying sdk.buildtools
, e.g.
sdk.buildtools=17.0.0
You will probably never need to do that, as it will use the most recent installed version by default. It is not tightly coupled to the SDK version, and has only been recently split apart from the SDK itself (since version 17).