run this command from librarian repository:
go run ./cmd/librarian/ release init -push
you'll get an error
time=2025-09-23T18:55:40.664Z level=INFO msg="failed to commit and push: failed to create pull request: POST https://api.github.com/repos/googleapis/librarian/pulls: 422 Validation Failed [{Resource:Issue Field:body Code:custom Message:body is too long (maximum is 65536 characters)}]"
exit status 1