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. 'Get agency detailed information' implies a read-only operation, but doesn't specify whether this requires authentication, what format the information returns, whether there are rate limits, or what happens with invalid agency IDs. For a tool with zero annotation coverage, this minimal description leaves significant behavioral questions unanswered.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.