Debile is a Debian build system. It's ultra reduced, super minimal and purely implemented in modern Python. This allows folks to use debile as a platform to aid with building debs, or running custom tooling against debs or debian source packages.

Debile isn't useful for many "normal" situations, other tools, such as sbuild, or pbuilder will do much better when used directly by simple shell scripts. It's also not great as a buildd, check out wanna-build if you're interested in a big professonal setup.