Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the burden of disclosing behavior. 'Delete' implies a destructive, likely irreversible action, and 'your own tweets' conveys an ownership requirement. However, it does not state irreversibility, potential errors, or permission requirements beyond ownership, which would be useful for a mutation tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.