Agent
The Agent will watch the same data this documentation describes and tell you when something you asked about happens: rules, delivery, tags.
It does not exist yet. This page is here so that when it does, it lands where you are already reading rather than in a separate help site nobody finds.
What is decided: a rule will be a DQL condition — the same language, the same three-valued logic, the same provenance on every value it fires on. If you can screen for it today, you will be able to be told about it.
What is not decided: delivery, tagging, and how a rule states what it wants when a condition goes from unknown to true. That is not the same event as going from false to true — the first means the data arrived, the second means the market moved — and treating them alike would produce alerts that fire on the platform’s own gaps.
Until then, the stream sends every change as it arrives, including a status change with no new value, and a program of yours can decide what is worth acting on.