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. 'Create a new task' implies a write/mutation operation, but it reveals nothing about permissions required, whether the creation is immediate or queued, what happens on failure, rate limits, or what the response contains. For a mutation tool with zero annotation coverage, this is critically inadequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.