Position bias
after Hanako
Where it sits outranks what it says
One instruction, four fixed slots, and one rule you can move.
POS 33% · USE 28%
one context window, start to endthe model reads all of it
how reliably a position gets used
highlow
your rule · 28% · weakest
The system prompt
re-read on every single turn
The file you pasted
six thousand lines of it
Tool output from earlier
climbing back, not all the way
The question you just asked
the last thing it reads
Your rule is parked in the blind spot
you did not write a weak rule. you put a good rule in a weak slot.