Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations indicate readOnlyHint=false, destructiveHint=false, idempotentHint=false. The description adds no further behavioral details (e.g., fetch+merge vs rebase, conflict handling, authentication needs). With annotations present, the bar is lower, but the description does not enhance transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.