It's a separate binary -- we install Ruff if you invoke `uv format`. So if you don't invoke `uv format`, there's no impact on the binary size, etc.

But, for example, my project already uses Ruff, and I have to worry about having a "managed" extra copy of Ruff that subtly alters the normal functioning both of "uv tool run" and of ruff itself.

It's intentionally distinct from the `uv tool` interface — it won't change `ruff` or `uv tool run` behaviors.