Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already flag non-read-only, destructive and open-world; the description adds real value on top by disclosing that each call appends another commit (cumulative history, not a reset) and that repo must come from get-github-status. It does not explain what makes the operation 'destructive' or what happens on conflict/failure, leaving a small gap against the annotation bar.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.