Use manual Tab upgrades and compare Auto Farm, Auto Sell, and Auto Upgrade terms only when they appear in a menu.
Quick answer
What to do
Press Tab to open the upgrade menu, compare the options visible in your round, and choose the tool change that matches the problem you are trying to solve.
The practical upgrade action is manual: earn cash from a cow exchange, press Tab, read the current menu, and choose an option you can afford. No Auto Upgrade switch appears in these steps.
Manual Tab routine
Collect a small batch of hay.
Take it to the cow and finish the exchange.
Press Tab and read each visible price and effect.
Choose the upgrade that matches your bottleneck.
Return to the hay and check the next loop.
Inspect pickup or Grasp if each collection action feels small. Inspect Bag if return trips interrupt the search. Inspect Hold if repeated clicking is the nuisance. Only use options that appear in your current menu.