Not in memory
When it is not in the memory, it says so.
No guessing and no filler. If the notes are not there, the answer says so, and you can ask a person instead.
Every answer
What every answer comes with.
The notes it used
Numbered in the answer, so you can open each one.
Where each note came from
Open a note to see its source, who added it and when.
Who can see it
Every answer reads only what the person asking may open.