Try this
- Choose the point at which the shopper will check the list and explain what happens to later additions.
- For a genuinely essential late item, send a direct request and wait for acknowledgment. Adding text to a list alone does not confirm it will be purchased.
A worked example
“I’ll check the list before entering the shop. Later additions may wait.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Do not assume a new item was seen just because it was added.