index-v1.json and index.xml use default repository description
$ curl -s https://f-droid.org/repo/index-v1.json | jq '.repo.description'
"This is a repository of apps to be used with F-Droid. Applications in this repository are either official binaries built by the original application developers, or are binaries built from source by the admin of f-droid.org using the tools on https://gitlab.com/fdroid."
$ curl -s https://f-droid.org/repo/index-v2.json | jq '.repo.description."en-US"'
"The official F-Droid Free Software repository. Everything in this repository is always built from the source code."