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' implies mutation, but the description doesn't specify permissions required, whether updates are partial or complete, error handling for invalid inputs, or response format. It mentions 'multiple meetings' but doesn't clarify limits or atomicity of the batch operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.