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Follow one topic on a news site, at almost no cost. You want to know when something is published about one specific topic — without reading the whole site every hour. A job can watch for you, and it costs almost nothing while nothing is happening.
A job fetches the headlines. A cheap comparison first checks whether anything changed since the last check. Only when something is new does the agent actually read it.
If nothing relevant appears for days, the job slows down to once per hour by itself. The moment a matching story appears, it speeds back up to every 15 minutes.
Every matching story is added to a running file, with its source and time. You read it whenever you want.