Class and Level Geekery XVIII - Everyone's an Expert

[Kornaki]

She's a hobbit. Weighs 30 pounds, doesn't even pull the noose taut. She doesn't need much strength or a skill to hang on one hand, unlike a human.

Yeah but this thread is about 3.5 rules

https://www.d20srd.org/srd/skills/climb.htm

Which my read is you can cling to a wall with one arm without making any check at all.

You need both hands free to climb, but you may cling to a wall with one hand while you cast a spell or take some other action that requires only one hand.