Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, idempotentHint=false, destructiveHint=false, and openWorldHint=true, but the description adds zero context beyond them – nothing on what fields can be patched, whether omitted fields are preserved (the whole point of a partial update), permission requirements, or side effects. With no annotations this would still be a 1; with annotations it contributes nothing.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.