Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. While 'Extract text content' implies a read operation, it doesn't specify whether authentication is required, rate limits apply, what happens with malformed PDFs, or what the output format looks like. For a tool that processes external files, this 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.