I know this question would come up some day…I have a personal opinion about that for cockpit. I want to keep the repo small and simple + a „clean“ vendor folder without docs/tests etc. I understand that for large projects, composer is a must, but Cockpit has very few dependencies which are easy to update before a release. You should be able to download cockpit from github and start right away without any further step. so for now composer integration is not planned.