Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden. It only states 'Supprimer un tour' (delete a tour), but does not disclose if deletion cascades to associated data, if it is immediate/permanent, or what checks occur. A destructive operation like this needs more behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.