What does it mean that chained triggers?

The completion of one agent becomes the trigger for the next.

Example: You finish brushing your teeth and that completion — mouth closed, toothbrush back in the holder — is the trigger that activates your next agent: fill the kettle. The kettle clicking off triggers pouring coffee. Pouring coffee triggers sitting at the desk. Sitting at the desk triggers opening your journal. You didn't decide five times. You decided once — to brush your teeth. The chain carried you the rest of the way.

Try this: Map one existing chain in your life. Pick a reliable morning or evening sequence and write out every link: 'After I [completion of A], I do [B].' Identify where the chain breaks most often — that's your weakest link. Now design one new two-link chain: pick an existing behavior you already do reliably and attach one new behavior to its completion. Run it for three days. If it holds, extend the chain by one more link.