I guess it depends on what you mean by a build system. From my understanding uv build basically just bundles up all the source code it finds, and packages it into a .whl with the correct metadata. It cannot actually do any build steps like running commands to compile or transform code or data in any way. For that you need something like setuptools or scikit-build or similar. All of which integrate seamlessly with uv.

I see what you mean. You can use it with mise that has build support.

It actually does exactly what pip does depending on your configured build backend, so if you have your pyproject.toml/setup.py configured to build external modules, `uv build` will run that and build a binary wheel

Yes, that's my point. You need to bring your own 'real' build system to make uv doing anything non-trivial. And the fact that this work transparently with uv is a very good thing.