The 71% reduction is interesting but I'd want to see where those tokens are actually going in a typical agent session. In my experience running multi-step coding agents, the git output itself is rarely the bottleneck...
Not saying it is the bottleneck. It's bloat. 7.4% of all shell tokens across 3,156 sessions is a lot of unnecessary context. It won't make or break a session, but it adds up across thousands of calls.