What does it mean that agent components: trigger, condition, and action?

Every agent has a trigger that activates it, a condition that validates it, and an action it takes.

Example: You design an agent for email triage: trigger — a new message lands in your inbox. Condition — the sender is not in your contacts and the subject contains a request. Action — move it to a 'Review Friday' folder. Without the condition, every email gets deferred. Without the trigger, the rule never fires. Without the action, you've built a sensor that watches but never responds. All three components must be present for the agent to function.

Try this: Pick one recurring decision you make on autopilot — what to eat for lunch, whether to check your phone when it buzzes, how to respond when a meeting runs over. Decompose it into its three components: (1) What triggers it? Name the specific situational cue. (2) What condition validates it? What must be true for you to proceed? (3) What action do you take? Write it as a single if-when-then statement: 'When [trigger], if [condition], then [action].' You have now reverse-engineered one of your default agents.