Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Goes well beyond the annotations: it discloses the authentication requirement and the fallback behavior (the connection prompts sign-in on printdash.io), that the original is unchanged, and that every line is re-priced at today's rates — a material side effect for a non-readOnly tool with destructiveHint=false. It stops short of spelling out that a second call yields a second independent quote (idempotentHint=false), which is the one behavioral consequence an agent could still get wrong.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.