git ungraft is a tool for ungrafting commits when working with shallow clones of repositories. It investigates the grafted commits to check whether or not their parents are present locally and removes the graft tag, effectively restoring the history between the commits.

When shallowly fetching commits with e.g. depth=1 they will all have the graft tag, even if the commits are directly related as parent/child commits. This tool is used to remove the graft tag on those commits which have all their parents locally present.