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 'mute or unmute' implies a state-changing operation, it doesn't specify whether this requires special permissions, if changes are immediate or reversible, what happens to audio signals, or any rate limits. For a mutation tool with zero annotation coverage, this is insufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.