Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. 'Create a new team' implies a mutation operation but doesn't specify whether it's idempotent, what happens on conflicts, or what the response includes. It misses details like rate limits, authentication needs, or side effects.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.