Transport and Prehension
Every automation is doing one of two things: transport — moving things unchanged — or prehension, the taking-in that decides what matters, whose signature is permanent discard. The obvious rule, automate the safe half, fails in your own inbox: a drafting assistant has decided what the mail was about before you approve anything. So the line is not a property of tasks. It is a door — the point where output turns into your name, past which nothing crosses unread. One door, honestly kept, buys back both the hours and the authorship; most people have either ten anxious doors or none.
A script reads my studio's version history and turns the week into a few published lines. Between the reading and the publishing, a judgment happens — what the week was about — and for a long while I could not say whether the machine was carrying my work or living it. I have a working answer now, and it is not a rule about which tasks are safe to automate. It is a door: a point in the operation past which nothing leaves without a human having read it and meant it. To say why a door, and not a rule, I need two words.
Two operations
Transport is movement without transformation — carrying, formatting, scheduling, retrying, collating. The object arrives unchanged; nothing about it has been decided. Prehension is the other operation: the taking-in of many things into one stance toward them, and its signature is loss — deciding what the week was about means deciding what it was not about, permanently. The word is Alfred North Whitehead's, borrowed for the one thing judgment cannot say: judgment names a faculty that someone exercises; prehension names an event that simply happens — a taking-in, with permanent discard — whether or not anyone is exercising anything. That difference is about to do all the work.
Your inbox already knows this
The obvious rule — automate the transport, keep the prehension — fails at exactly the edge you live on, and you do not need my studio to see it. Take the assistant that drafts replies to your mail. Drafting is supposed to be the safe half: you still click send, so you have kept the judgment. Except the draft has already decided what the incoming message was about, which of its points deserved an answer, and what tone you take with this particular person. By the time you approve it, most of the taking-in has happened — an event, with discard, and nobody exercising anything. That is prehension without a judge, and machines now perform it all day, in small denominations, under the label of carrying. A sorting of tasks into safe and unsafe bins cannot survive this. The summary was already a stance; the draft was already a position; the safe half was never safe.
The door
So the line is not a property of tasks, and you cannot draw it once and go back to sleep. It is a decision about where the signature sits — the point past which an output stops being material and becomes a position that someone can be asked to answer for. Mine sits at the studio's exit: nothing the machine writes leaves without having been read by me, and the reading is not quality control — the machine makes fewer typos than I do. The reading is the prehension that counts, because it is the moment the words stop describing my work and become something I am saying. Your send button is the same door, on one condition: that you actually read what you sign. A door you wave things through is transport wearing the costume of judgment — and it is remarkable how quickly waving starts to feel like reading.
Where to put yours
The carryable part is a placement, not a policy. Look at whatever you adopted this year that drafts, summarizes, or recommends, and ask two questions of it: where did the discard happen, and who read the result before it became yours? Then put one door at the point where output turns into your name — the sent mail, the published page, the number you quote to a client — and let everything upstream of it run as fast as it likes. One honestly-kept door buys back both of the things this argument has been about. The hours, because everything before the door is transport and can be automated without guilt. And the authorship, because nothing crosses it unread. Most people, as far as I can tell, have either ten anxious doors or none. One is the number that works.
The boundary will not hold still, so the door has to be kept, not just installed. The machines keep getting better at what looks like taking-in, and each new ability arrives labeled as more carrying — that is precisely how the deciding drifts out of the room. So keep asking, of every smooth new default, which of the two operations it just absorbed. The stakes are not symmetrical: a machine that transports for you hands you back your hours. A machine that prehends for you is, quietly and with excellent manners, living your life.