I don't know how to track tools in C++

[qkrwldyd19]

I want to track a pencil using leap motion.
I tried to use frame.tools.frontmost() or frame.pointables()[0], ...
but everything's failed.
when I print them, they said only "Invalid Tool".
My device could not recognize all things except my hands.
So, how can I track my pencil?
(in Windows 10, C++, SDK 3.2.1)

[AlexColgan]

The Orion SDK doesn't support tool tracking. You'll need to revert to the V2 SDK.