Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the burden of behavioral disclosure. It only says 'Search for files matching a glob pattern' and does not mention whether the search is recursive, how hidden files are handled, what the return format is, or whether max_results has implications. This is a significant gap for a tool with zero annotation coverage.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.