How will be my function code size affected?

Thundra tries to affect function size at minimum level. Since our .NET library only has an additional size of 24.2 MB, it will not exaggerate your function size.

I wrap my function with LambdaRequestHandler and can't see any invocation .

Make sure your handler points <MyAssembly>::<MyNamespace>.<MyClass>::HandleRequest✅

not <MyAssembly>::<MyNamespace>.<MyClass>::DoHandleRequest❌