Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The one genuinely additive disclosure is 'keyless, nothing to sign', which tells the agent no wallet signature is required — annotations cannot express that. The rest repeats annotations nearly verbatim and doubles down with a redundant 'Cost and signer: free and keyless' sentence, adding no rate-limit, auth-scope, or staleness behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.