diff --git a/src/ytdl_sub/script/functions/__init__.py b/src/ytdl_sub/script/functions/__init__.py
index bda1216e..5b98d24b 100644
--- a/src/ytdl_sub/script/functions/__init__.py
+++ b/src/ytdl_sub/script/functions/__init__.py
@@ -68,6 +68,11 @@ class Functions(
         ----------
         function
             A static function whose name will be used as the offered function name.
+
+        Raises
+        ------
+        ValueError
+            If the name already exists as a function.
         """
         if cls.is_built_in(function.__name__):
             raise ValueError(
diff --git a/src/ytdl_sub/script/script.py b/src/ytdl_sub/script/script.py
index 33ca2e1b..8e6302e3 100644
--- a/src/ytdl_sub/script/script.py
+++ b/src/ytdl_sub/script/script.py
@@ -405,6 +405,24 @@ class Script:
         resolved: Optional[Dict[str, Resolvable]] = None,
         unresolvable: Optional[Set[str]] = None,
     ) -> Dict[str, Resolvable]:
+        """
+        Given a new set of variable definitions, resolve them using the Script, but do not
+        add them to the Script itself.
+
+        Parameters
+        ----------
+        variable_definitions
+            Variables to resolve, but not store in the Script
+        resolved
+            Optional. Pre-resolved variables that should be used instead of what is in the script.
+        unresolvable
+            Optional. Unresolvable variables that will be ignored in resolution, including all
+            variables with a dependency to them.
+
+        Returns
+        -------
+        Dict containing the variable names to their resolved values.
+        """
         try:
             self.add(variable_definitions)
             return self._resolve(
diff --git a/src/ytdl_sub/script/types/function.py b/src/ytdl_sub/script/types/function.py
index 23389296..94bbad5d 100644
--- a/src/ytdl_sub/script/types/function.py
+++ b/src/ytdl_sub/script/types/function.py
@@ -93,6 +93,8 @@ class BuiltInFunction(Function, BuiltInFunctionType):
 
         return self
 
+    # pylint: disable=missing-raises-doc
+
     @property
     def callable(self) -> Callable[..., Resolvable]:
         """
@@ -106,6 +108,8 @@ class BuiltInFunction(Function, BuiltInFunctionType):
             # Should be validated in the parser
             raise UNREACHABLE from exc
 
+    # pylint: enable=missing-raises-doc
+
     @functools.cached_property
     def function_spec(self) -> FunctionSpec:
         """
diff --git a/src/ytdl_sub/script/types/resolvable.py b/src/ytdl_sub/script/types/resolvable.py
index 50c57ff3..767d2ed9 100644
--- a/src/ytdl_sub/script/types/resolvable.py
+++ b/src/ytdl_sub/script/types/resolvable.py
@@ -114,8 +114,6 @@ class Hashable(Resolvable, ABC):
     Resolvable type that can be used as hashes (i.e. in Maps)
     """
 
-    pass
-
 
 @dataclass(frozen=True)
 class NonHashable(NamedType, ABC):
@@ -123,8 +121,6 @@ class NonHashable(NamedType, ABC):
     Type that is known to never be hashable.
     """
 
-    pass
-
 
 @dataclass(frozen=True)
 class ResolvableToJson(Resolvable, ABC):
@@ -151,32 +147,40 @@ class Numeric(ResolvableT[NumericT], ABC, Generic[NumericT]):
     Resolvable numeric types (int/float)
     """
 
-    pass
-
 
 @dataclass(frozen=True)
 class Integer(Numeric[int], Argument):
-    pass
+    """
+    Resolved Integer type
+    """
 
 
 @dataclass(frozen=True)
 class Float(Numeric[float], Argument):
-    pass
+    """
+    Resolved float type
+    """
 
 
 @dataclass(frozen=True)
 class Boolean(ResolvableT[bool], Argument):
-    pass
+    """
+    Resolved bool type
+    """
 
 
 @dataclass(frozen=True)
 class String(ResolvableT[str], Argument):
-    pass
+    """
+    Resolved String type
+    """
 
 
 @dataclass(frozen=True)
 class NamedCustomFunction(NamedArgument, ABC):
-    pass
+    """
+    A custom function with a defined name (but unknown args)
+    """
 
 
 @dataclass(frozen=True)
@@ -236,5 +240,3 @@ class LambdaReduce(LambdaTwo):
     """
     Type-hinting for functions that apply a reduce-operation using a lambda (two arguments)
     """
-
-    pass
diff --git a/src/ytdl_sub/script/types/variable.py b/src/ytdl_sub/script/types/variable.py
index 1698803c..5471ec30 100644
--- a/src/ytdl_sub/script/types/variable.py
+++ b/src/ytdl_sub/script/types/variable.py
@@ -17,6 +17,12 @@ class FunctionArgument(Variable):
 
     @classmethod
     def from_idx(cls, idx: int, custom_function_name: Optional[str]) -> "FunctionArgument":
+        """
+        Returns
+        -------
+        FunctionArgument whose variable name is the index, and optionally contains the custom
+        function name its defined in as a prefix.
+        """
         if custom_function_name:
             return FunctionArgument(name=f"${custom_function_name}___{idx}", index=idx)
         return FunctionArgument(name=f"${idx}", index=idx)
diff --git a/src/ytdl_sub/script/types/variable_dependency.py b/src/ytdl_sub/script/types/variable_dependency.py
index b96753fe..37215a13 100644
--- a/src/ytdl_sub/script/types/variable_dependency.py
+++ b/src/ytdl_sub/script/types/variable_dependency.py
@@ -39,7 +39,9 @@ class VariableDependency(ABC):
                 output.append(arg)
 
             if isinstance(arg, VariableDependency):
+                # pylint: disable=protected-access
                 output.extend(arg._recurse_get(ttype))
+                # pylint: enable=protected-access
 
         return output
 
@@ -83,6 +85,8 @@ class VariableDependency(ABC):
         """
         return set(self._recurse_get(Lambda, subclass=True))
 
+    # pylint: disable=missing-raises-doc
+
     @final
     @property
     def custom_functions(self) -> Set[ParsedCustomFunction]:
@@ -105,6 +109,8 @@ class VariableDependency(ABC):
 
         return output
 
+    # pylint: enable=missing-raises-doc
+
     @abstractmethod
     def resolve(
         self,
diff --git a/src/ytdl_sub/script/utils/exception_formatters.py b/src/ytdl_sub/script/utils/exception_formatters.py
index 7cda126a..fb3b5e6e 100644
--- a/src/ytdl_sub/script/utils/exception_formatters.py
+++ b/src/ytdl_sub/script/utils/exception_formatters.py
@@ -130,11 +130,10 @@ class FunctionArgumentsExceptionFormatter:
         for arg in self._input_args:
             if isinstance(arg, BuiltInFunctionType):
                 if is_union(arg.output_type()):
-                    received_type_names.append(
-                        f"%{arg.name}(...)->Union["
-                        f"{', '.join(sorted(type_.type_name() for type_ in arg.output_type().__args__))}"
-                        f"]"
+                    readable_type_names = ", ".join(
+                        sorted(type_.type_name() for type_ in arg.output_type().__args__)
                     )
+                    received_type_names.append(f"%{arg.name}(...)->Union[{readable_type_names}]")
                 else:
                     received_type_names.append(f"%{arg.name}(...)->{arg.output_type().type_name()}")
             else:
diff --git a/src/ytdl_sub/script/utils/type_checking.py b/src/ytdl_sub/script/utils/type_checking.py
index 2c2ccf7c..bac63c00 100644
--- a/src/ytdl_sub/script/utils/type_checking.py
+++ b/src/ytdl_sub/script/utils/type_checking.py
@@ -143,6 +143,11 @@ class FunctionSpec:
         return True
 
     def _is_varargs_compatible(self, input_args: List[Argument]) -> bool:
+        """
+        Returns
+        -------
+        True if the input args are compatible with the spec's varargs. False otherwise.
+        """
         assert self.varargs is not None
 
         for input_arg in input_args:
@@ -165,22 +170,42 @@ class FunctionSpec:
         raise UNREACHABLE  # TODO: functions with no args
 
     def is_num_args_compatible(self, num_input_args: int) -> bool:
+        """
+        Returns
+        -------
+        True if the number of input args is compatible with the function spec. False otherwise.
+        """
         if self.args is not None:
             return self.num_required_args <= num_input_args <= len(self.args)
         return True  # varargs can take any number
 
     @property
     def num_required_args(self) -> int:
+        """
+        Returns
+        -------
+        The minimum number of args required to call the function.
+        """
         if self.args is not None:
             return sum(1 for arg in self.args if not is_optional(arg))
         return 0  # varargs can take any number
 
     @property
     def is_lambda_reduce_function(self) -> Optional[Type[LambdaReduce]]:
+        """
+        Returns
+        -------
+        True if the function is a Lambda-reduce function. False otherwise.
+        """
         return LambdaReduce if LambdaReduce in (self.args or []) else None
 
     @property
     def is_lambda_function(self) -> Optional[Type[Lambda | LambdaTwo | LambdaThree]]:
+        """
+        Returns
+        -------
+        True if the function is a Lambda function (excluding reduce). False otherwise.
+        """
         if LambdaThree in (self.args or []):
             return LambdaThree
         if LambdaTwo in (self.args or []):
@@ -191,6 +216,11 @@ class FunctionSpec:
 
     @property
     def is_lambda_like(self) -> Optional[Type[TLambda]]:
+        """
+        Returns
+        -------
+        True if the function is a Lambda type (including reduce).
+        """
         if l_type := self.is_lambda_reduce_function:
             return l_type
         if l_type := self.is_lambda_function:
@@ -199,6 +229,11 @@ class FunctionSpec:
 
     @classmethod
     def from_callable(cls, callable_ref: Callable[..., Resolvable]) -> "FunctionSpec":
+        """
+        Returns
+        -------
+        FunctionSpec from a built-in function.
+        """
         arg_spec: FullArgSpec = inspect.getfullargspec(callable_ref)
         if arg_spec.varargs:
             return FunctionSpec(