Having not looked at it deeply yet, why require building every time it's invoked? Is the idea to get it working then add build caching later? Seems like a pretty big drawback (bigger than the go.mod pollution, for me). Github runners are sllooooow so build times matter to me.
`go tool` doesn't require a rebuild, but it does checking that the tool is up-to-date (which requires doing at least a bit of work).
This is one of the main advantages of using `go tool` over the "hope that contributors to have the right version installed" approach. As the version of the tool required by the project evolves, it continues to work.
Interestingly, when I was first working on the proposal, `go run` deliberately did not cache the built binary. That meant that `go tool` was much faster because it only had to do the check instead of re-running the `link` step. In Go 1.24 that was changed (both to support `go tool`, but also for some other work they are planning) so this advantage of `go tool` is not needed anymore.
