Some things people can do easily enough without ever needing a check unless
they are abnormally incapacitated.  For other, more routine tasks, a normal
roll may be required.

EASY = Everyone automatically succeeds on this ability check unless they
have a negative stat, in which case it's an automatic failure.

TRIVIAL = Those with a stat below 10 are unable to pass this check.
ROUTINE = Some people with a stat below 10 can fail this check, but only
rarely.
CHALLENGING = A challenge against 100 in the affecting stat.  People with
100+ in stats never have to make these checks.
* = newbies are exempt.

marts-form - AGI - EASY
rest - AGI - EASY
walk - AGI - EASY
stand - AGI - EASY
dismount - AGI - ROUTINE
mount - AGI - ROUTINE

lead - CHA - EASY
feed - CHA - ROUTINE
ask - CHA - CHALLENGING*

drop - DEX - EASY
get - DEX - EASY
give - DEX - EASY
lock - DEX - EASY
wear - DEX - EASY
wield - DEX - EASY
unload - DEX - EASY
unlock - DEX - EASY
unpack - DEX - EASY
open - DEX - EASY
pack - DEX - EASY
close - DEX - EASY
remove - DEX - EASY
cast - DEX - ROUTINE
dice - DEX - ROUTINE
reload - DEX - ROUTINE
cointoss - DEX - CHALLENGING

think - INT - ROUTINE
count - INT - ROUTINE
sense - INT - CHALLENGING

blook - PER - EASY
eq - PER - EASY
look - PER - EASY
point - PER - EASY
view - PER - EASY
scan - PER - EASY
inventory - PER - EASY
exits - PER - ROUTINE
peer - PER - ROUTINE
listen - PER - CHALLENGING
search - PER - CHALLENGING
smell - PER - CHALLENGING

flight - STR - EASY

keep - WIS - EASY
invoke - WIS - ROUTINE

go - STR/AGI - EASY
label - INT/DEX - TRIVIAL
put - DEX/AGI - EASY
escape - STR/DEX - CHALLENGING