Back up your prompts before sunset. Copy each Agent's prompt and run configuration into a local document so you have an offline reference. The migration flow itself also preserves the prompt inside each new Automation as you rebuild.
Your Agents are listed under Settings → Moby Tools → Agents (Moby 1) during the migration window — that's the best time to walk the list and save what you need. An offline copy means you're not depending on future UI state to recover a prompt.