Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of disclosing behavioral traits. It merely states 'Toggle session record mode' without explaining what toggling does (e.g., starts/stops recording, affects session view), side effects, or state changes. This adds minimal value beyond the tool name.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.