Open your email and look at the messages you have sent to yourself. A business owner I know does it twenty times a week: reads something useful on his phone, fires it to his own inbox, gets back to work. He thinks he is hoarding links. He is actually recording his taste, and nobody has told him yet.
Forget the scary word. "Train your agent" is not code. Think about the last good person you hired. On day one they were sharp but useless to you, because they knew nothing about how you work. You did not reprogram them. You showed them examples: keep this, ignore that, always flag this third thing. A few weeks later, they just knew. That is training, and an agent is the same brilliant new hire.
Here is the part people get backwards. The valuable thing is not the pile of saved articles. It is the judgment that decided what went into the pile and what got skipped. Do not hand the agent the catalog. Hand it the judgment that made the catalog.
What I actually do: every week I drop each thing I emailed myself into one of four buckets, Act on it, Use it now, Keep it, or Ignore, then give each a thumbs up or down. Every drop is a labeled example: this thing, in my world, is THAT kind of thing. A hundred of those tiny votes is a portrait of my taste drawn from real life instead of guesswork.
Notice what is missing. I have not built a robot or written a line of code. I made my own judgment visible and repeatable, so it can be handed off later.