Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description bears full responsibility for disclosing behavioral traits. 'Reset Upload Dir' does not explain what side effects occur (e.g., file deletion, irreversible changes), required permissions, or operational constraints. This is dangerously vague for a potentially destructive operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.