Definition
A trigger is an event that causes an agent run to start, such as an incoming message, an inbound webhook, or a scheduled time being reached.
In practice
Triggers are what separate an agent you use from an agent that works. A scheduled trigger fires at a fixed cadence, which suits recurring deliverables such as a daily digest or a weekly report. An event trigger fires when something happens, which suits reactive work such as triaging a message as it lands. The detail that catches people is that a schedule on a machine that is asleep does not queue up and run later; the moment passes and nothing records that it did. Recording every trigger, including runs that found nothing to do, is what makes silence diagnostic.
Example
A recruiter uses two triggers on one agent. A scheduled trigger runs at 8am every weekday and summarises new applications. An event trigger fires whenever a candidate books an interview, through the booking tool's webhook, and the agent prepares a short brief on that candidate. Every trigger leaves a run record, including mornings with no new applications, so a quiet Monday looks different from a broken one.
Common questions about trigger
What is the difference between a scheduled trigger and an event trigger?
A scheduled trigger starts an agent run at a fixed time or cadence, which suits recurring deliverables like a daily digest. An event trigger starts a run when something happens, such as a message arriving or a webhook firing, which suits reactive work like triaging a request the moment it lands.
What happens to a trigger when the host is offline?
Usually nothing at all. A scheduled trigger that fires while the machine is asleep or offline does not queue and run later: the moment passes, and nothing records that it was missed. That is why an agent trigger should live on a host that stays online, and why every run should be recorded.
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