Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish readOnlyHint=false, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. Beyond that, the description adds genuinely useful context: jobs are 'owner-scoped' (auth scoping), 'resumable' (lifecycle), and 'Each source consumes its usual member quota' (rate/quota cost). It does not explain failure/idempotency behavior beyond the word 'stable'.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.