Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full behavioral burden. It discloses the output shape (section_id, title, snippet), a limit of up to 5 results, and that results are ordered by best match first. This provides meaningful transparency beyond a basic statement, though it does not detail matching algorithms or edge cases.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.