Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint: true, so the description doesn't need to re-state safety. The description adds value by clarifying that the tool is 'free' (no cost) and requires an owned ideaId. It also broadly describes what the analysis covers (momentum, timing, opportunity). No contradictions with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.