Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=false, so safety framing is partly covered. The description adds one genuinely useful behavioral fact — in-flight statements are cancelled — but says nothing about whether the stop waits, is idempotent, or what happens if the run already finished.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.