Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. 'Débannit un utilisateur' implies a mutation operation that reverses a ban, but it doesn't specify required permissions, whether the action is reversible, rate limits, or what happens if the user isn't banned. This is inadequate for a mutation tool with zero annotation coverage.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.