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. It only states the action (segmenting) without describing side effects, output format, whether the input is modified, or what the function returns. An agent cannot anticipate what 'segmenting' produces (e.g., a list of regions, a modified file) or any side effects on the input file. This is a significant gap for a tool with no annotation support.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.