Describe the solution you'd like
Set the current repo as an environment variable that can be accessed while processing. From the logs it looks like this is available at invocation time

[git-xargs] DEBU[2023-03-03T10:38:56-08:00] Created branch                                Branch Name=refs/heads/add-self-hosted Repo=my-cool-repo
[git-xargs] DEBU[2023-03-03T10:38:56-08:00]                                               Repo=my-cool-repo

Describe alternatives you've considered
I could parse this out of the cwd, but that seems brittle since there's a lot of nonces to prevent collisions

/private/var/folders/zc/ysm6hx_n2qng1h09htfdw_8m0000gn/T/git-xargs-my-cool-repo1360847715

I could also invoke a git command and poke at the output, that involves too much shell cruft and line noise.

Additional context

It's possible this is already implemented or could be solved simpler than I envision.