Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide no safety hints (readOnlyHint=false, destructiveHint=false), so the description must explain what selecting a material changes and what side effects occur. It only says 'select,' which is minimally informative and does not disclose whether a project must be open, whether selection affects later operations, or how invalid IDs are handled.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.