Because in many tools the note and the reply are the same box with a toggle. The toggle is missed once, and a candid internal assessment reaches the customer.
An internal note is a comment on a ticket visible only to your team, kept in a different field from the customer reply.
Notes are a separate field with distinct styling, never included in a reply, never in the portal, and never in an email thread. It is not a permission that could be misconfigured.
An agent hands over a ticket mid-investigation. The note records what has been tried and what is suspected, so the next agent does not restart, and none of it is customer-facing.
They are not private. Anyone with access to the ticket can read them, so a note is an internal record, not a place for anything you would not want a colleague to read.
Handover, diagnosis, entitlement decisions and the reasoning behind a judgement call — the context that makes the next person effective.
Yes, which notifies them without involving the customer.
In internal exports; never in anything customer-facing.
Only by deliberately copying it, which is the intended friction.
Fourteen days, every module, no card. Or half an hour with someone who will run it on your own records and tell you where it does not help.