Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden. It discloses key behavioral traits: results are 'automatically truncated if they would exceed 25,000 tokens,' and it explains parameter defaults and constraints (e.g., 'max_results: 1-1000'). However, it doesn't cover aspects like rate limits, authentication needs, or error handling.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.