The forward deployed engineer's attention is what holds a new deployment together. At day 60 that attention goes away, and the account moves to a customer success manager who covers many more customers and can't read the configuration. What survives that move is whatever got written down.
So write one page. The promise, the signal, the watch list, the keys, and a recall rule. The CSM owns the account from there. A named person at the customer owns the ability to change the customer layer, and if nobody does, the deployment is still being held up by the engineer who built it. Gartner's September 29, 2026 forecast, that 70% of enterprises will abandon agentic AI built by vendor forward deployed engineering by 2028 because they are "unable to evolve it on their own," is that blank line added up across a market.
Part 6 of The FDE Transition, Month Two: The FDE Leaves, the Workflow Has to Stay, makes the case in full. The handbook chapter on building the FDE team covers the pairing behind it: adoption is a deliverable, owned by name.