Slight Build?

[Yogibear41]

Does slight build give a bonus on to hit and to ac as if the creature was a size smaller? Or is it just for skill checks such as hide?

Does it do anything good that I am missing?

[Chronos]

The text of the ability (http://www.wizards.com/default.asp?x=dnd/we/20060420a):

Slight Build: The physical stature of kobolds lets them function in many ways as if they were one size category smaller. Whenever a kobold is subject to a size modifier or special size modifier for an opposed check (such as Hide), the kobold is treated as one size smaller if doing so is advantageous to the character. A kobold is also considered to be one size smaller when "squeezing" through a restrictive space. A kobold can use weapons designed for a creature one size smaller without penalty. However, the space and reach of a kobold remain those of a creature of their actual size. The benefits of this racial trait stack with the effects of powers, abilities, and spells that change the subject's size category.

They count as smaller for two circumstances: When making an opposed check, if it would be advantageous, and when squeezing through a tight space. Attack rolls are checks, but they are not opposed checks, so it doesn't apply there. It is, however, a nice bonus to Hide. It also means that kobold warrens can be full of tunnels too small for a halfling to easily follow them through, but which the kobolds can use for sneaking up behind the party and ambushing them.

[White_Drake]

Hmm, what if you use the rolled AC variant rule?