Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It uses 'Get', implying a read-only operation, and constrains the accepted node types ('TileMapLayer or legacy TileMap'). However, it does not disclose return format, error behavior, or any side effects. It adds useful context but lacks details about what happens on invalid input or the structure of the returned data.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.