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Users should be able to opt in and out of managed toolchains, e.g.

managed-toolchains = always | preferred | fallback | never

We could also frame this differently, like..

toolchain-discovery = prefer-system | prefer-managed | only-system | only-managed

We could also frame this differently, like..

toolchain-discovery = prefer-system | prefer-managed | only-system | only-managed

What about?

toolchains = uv-first | system-first | managed-first | uv-only | system-only | managed-only

Or you could explicitly configure python providers like PDM. People might (and are) using tools like mise asdf pyenv.

What's the difference between uv-only and managed-only there?

I don't think we'll support discovery of Python interpreters in other tool's installation directories. It seems more reasonable to just expect them to be registered in the PATH (or, on WIndows, in the registry).

What's the difference between uv-only and managed-only there?

I don't think we'll support discovery of Python interpreters in other tool's installation directories. It seems more reasonable to just expect them to be registered in the PATH (or, on WIndows, in the registry).

Makes sense, but then I guess what's the difference between system python and other tools? In other words, brew python should just not come up, am I correct?

A "system" Python here is any Python toolchain installed on the system i.e. not being managed by uv. Brew Python will come up if it's on the PATH, but we won't try to discover it a Brew-specific location (as we won't, thusfar, attempt to discover pyenv Python in their storage directory)

It would be useful to be able to tell uv to prefer using asdf/pyenv discovery/installation if that's available rather than only python-build-standalone

This issue is actually completed: https://docs.astral.sh/uv/reference/settings/#python-preference

Feel free to open a new one to track support for other managed Python distribution kinds, but we're pretty unlikely to support more.

sure, done https://github.com/astral-sh/uv/issues/7400

Thanks!