Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so safety is covered by structured data and the description is not obliged to restate it. Beyond that, the description adds no behavior — nothing about what is returned (script source vs. metadata), or what happens when the title does not exist.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.