Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. 'Update an existing CRM object' implies a mutation operation but reveals nothing about required permissions, whether the update is partial or complete, validation rules, error conditions, rate limits, or what happens to unspecified properties. For a mutation tool with zero annotation coverage, this leaves critical behavioral aspects undocumented.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.