diff --git a/temporalio/workflow.py b/temporalio/workflow.py
index 64173266..136eb4d5 100644
--- a/temporalio/workflow.py
+++ b/temporalio/workflow.py
@@ -178,6 +178,13 @@ def signal(fn: CallableSyncOrAsyncReturnNoneType) -> CallableSyncOrAsyncReturnNo
     ...
 
 
+@overload
+def signal() -> (
+    Callable[[CallableSyncOrAsyncReturnNoneType], CallableSyncOrAsyncReturnNoneType]
+):
+    ...
+
+
 @overload
 def signal(
     *, name: str
@@ -232,12 +239,10 @@ def with_name(
             )
         return fn
 
-    if name is not None or dynamic:
+    if not fn:
         if name is not None and dynamic:
             raise RuntimeError("Cannot provide name and dynamic boolean")
         return partial(with_name, name)
-    if fn is None:
-        raise RuntimeError("Cannot create signal without function or name or dynamic")
     return with_name(fn.__name__, fn)
 
 
@@ -246,6 +251,11 @@ def query(fn: CallableType) -> CallableType:
     ...
 
 
+@overload
+def query() -> Callable[[CallableType], CallableType]:
+    ...
+
+
 @overload
 def query(*, name: str) -> Callable[[CallableType], CallableType]:
     ...
@@ -302,12 +312,10 @@ def with_name(
             )
         return fn
 
-    if name is not None or dynamic:
+    if not fn:
         if name is not None and dynamic:
             raise RuntimeError("Cannot provide name and dynamic boolean")
         return partial(with_name, name)
-    if fn is None:
-        raise RuntimeError("Cannot create query without function or name or dynamic")
     if inspect.iscoroutinefunction(fn):
         warnings.warn(
             "Queries as async def functions are deprecated",
@@ -921,6 +929,16 @@ def update(
     ...
 
 
+@overload
+def update() -> (
+    Callable[
+        [Callable[MultiParamSpec, ReturnType]],
+        UpdateMethodMultiParam[MultiParamSpec, ReturnType],
+    ]
+):
+    ...
+
+
 @overload
 def update(
     *, name: str
@@ -987,12 +1005,10 @@ def with_name(
         setattr(fn, "validator", partial(_update_validator, defn))
         return fn
 
-    if name is not None or dynamic:
+    if not fn:
         if name is not None and dynamic:
             raise RuntimeError("Cannot provide name and dynamic boolean")
         return partial(with_name, name)
-    if fn is None:
-        raise RuntimeError("Cannot create update without function or name or dynamic")
     return with_name(fn.__name__, fn)
 
 
diff --git a/tests/test_workflow.py b/tests/test_workflow.py
index 510fa18d..b34593e2 100644
--- a/tests/test_workflow.py
+++ b/tests/test_workflow.py
@@ -42,6 +42,10 @@ def signal2(self):
     def signal3(self, name: str, args: Sequence[RawValue]):
         pass
 
+    @workflow.signal()
+    def signal4(self):
+        pass
+
     @workflow.query
     def query1(self):
         pass
@@ -54,6 +58,10 @@ def query2(self):
     def query3(self, name: str, args: Sequence[RawValue]):
         pass
 
+    @workflow.query()
+    def query4(self):
+        pass
+
     @workflow.update
     def update1(self):
         pass
@@ -66,6 +74,10 @@ def update2(self):
     def update3(self, name: str, args: Sequence[RawValue]):
         pass
 
+    @workflow.update()
+    def update4(self):
+        pass
+
 
 def test_workflow_defn_good():
     # Although the API is internal, we want to check the literal definition just