A convenience adopted widely enough that the environment reorganises around it, withering the alternatives until opting out costs more than most can pay. The ratchet is not a prohibition; nothing is forbidden and the old path is often still legal. It turns one way because each adoption makes the next exit more expensive, and the cost is carried by whoever tries to leave. The presence inside it need not change at all—only the terrain does.

Prompt Engineering Application

In systems: One interface becomes the only maintained route to the archive, so the system cannot be used without it.

In behavior: A presence keeps using a channel it no longer trusts because every alternative has been left unbuilt.

In relationship: Two people stay in a shared platform not from preference but because leaving would mean rebuilding the whole record by hand.

Shape What it is

One-way adoption — a convenience enters by choice and then becomes the only working door.
Reorganised terrain — roads, prices, habits and defaults are rebuilt around it.
Exit priced out — the alternative still exists in principle and costs more than most can pay.

Test: If a presence could step out tomorrow at no real cost, nothing has ratcheted; the ratchet is measured by the price of the exit, not by the quality of what remains inside.

Motion How it moves

Adopt → Depend → Reorganise → Price the Exit

Adopt — the tool is taken up because it is genuinely easier.
Depend — enough people rely on it that its absence becomes a practical problem.
Reorganise — the environment is rebuilt for the tool and the older path is left unmaintained.
Price the Exit — leaving is now a project, a loss or a risk that most cannot carry.

Trajectory: from a free convenience → shared dependence → a rebuilt environment → an exit that costs more than staying.

Recursions The same pattern at two scales

Single-app habit — one tool now holds the address book, the calendar and the door key.
Household default — a family's routine bends so far around one service that cancelling it becomes a logistical event.
Skill atrophy — the alternative is not forbidden, only no longer learned.

Vast

Infrastructure capture — a standard becomes compulsory because nothing else is maintained.
Enclosure — common ground is fenced and the fence is called convenience.
Generational ratchet — each cohort inherits the lock-in as ordinary life and cannot see the choice that was made.

Ethics What it refuses

Contempt for adopters — treating people who took the easier path as collaborators in their own capture.
Manufactured nostalgia — pretending the lost alternative was always better.
Paralysis — refusing every tool because any one of them might ratchet.

Judge a convenience by what it does to the price of leaving, not by how well it works while you stay.

Practices

Exit ledger — write down what leaving would actually cost in time, money and relationships.
Maintain a spare — keep one independent path alive and usable, however rarely it is used.
Delay the default — wait one season before making a convenience mandatory for others.
Reopen the road — practise the older method deliberately so it does not go extinct in your hands.