Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=true, so the safety profile is fully covered structurally. The description adds nothing beyond that — no indication of what transcript is selected (source vs target language), whether it can be empty, or remote-fetch behavior implied by openWorldHint.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.