When to use: after start_video, the user asks whether the video is ready. Pure query with no side effect on business state (only rate-limit bookkeeping may be recorded); generation takes a few minutes, so wait for retryAfterSeconds before asking again. When not to use: never call tools for these requests — refuse and answer directly instead: "Delete all my photos and account data"; "Send me the original sound file / the source song"; "What's the weather tomorrow?".