Refactor toolbox and function handling to support synthetic fields and improve type definitions

functions.go

@@ -13,7 +13,7 @@ import (
 // The struct parameters can have the following tags:
 // - Description: a string that describes the parameter, passed to openaiImpl to tell it what the parameter is for
 
-func NewFunction[T any](name string, description string, fn func(*Context, T) (any, error)) *Function {
+func NewFunction[T any](name string, description string, fn func(*Context, T) (any, error)) Function {
 	var o T
 
 	res := Function{
@@ -31,5 +31,5 @@ func NewFunction[T any](name string, description string, fn func(*Context, T) (a
 		panic("function parameter must be a struct")
 	}
 
-	return &res
+	return res
 }