Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide readOnlyHint=true, destructiveHint=false, idempotentHint=true, and openWorldHint=true, indicating a safe, non-destructive, repeatable operation. The description adds minimal context by specifying it's a GET request, which aligns with annotations but doesn't disclose additional behavioral traits like error conditions, rate limits, or authentication needs beyond what annotations imply.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.