Progress

The server can report progress on long-running operations using progress tokens.

// In a long-running handler:
runtime.notify_progress(ProgressNotificationParams {
    progress_token: ProgressToken::String("task-123".into()),
    progress: 0.5,
    total: Some(1.0),
    message: Some("Processing...".into()),
    meta: None,
}).await?;

Progress tokens are typically provided by the client in the request. Use them to give feedback on tool execution or resource loading.