Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description usefully adds the return format (TypeScript declarations callable from execute_typescript) and the reach scope, but defers the operational contract to server instructions rather than disclosing it.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.