Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is fully covered. The description adds one genuinely useful behavioural fact not in the annotations: results are restricted to companies the user has authorized via OAuth. It says nothing about pagination behaviour or result size, which matters for a paged list endpoint.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.