Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It discloses the character limit and auto-extraction of hashtags, but lacks details on authentication needs (rider_token mentioned in schema but not behaviorally), rate limits, or error behaviors. Adds moderate transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.