- Track if an agent has read a call in the frontend state - Create a new coordinator zome function `get_calls_count` to return the number of calls in a herd - Poll `get_calls_count` periodically in the Watering Hole to identify which herds have new calls - Display visual indicator next to herd name indicating that there are new, unread calls in herd - Display visual indicator on Call in AllPosts component, indicating that it has not been read
