Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide readOnlyHint, openWorldHint, idempotentHint. The description adds critical behavioral details: requires a logged-in MCP session from `tronsave_login`, explains the `mcp-session-id` header requirement, clarifies that internal tools never accept API keys via arguments, and describes the two session types. No contradictions with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.