diff --git a/packages/toolbox-core/src/toolbox_core/sync_tool.py b/packages/toolbox-core/src/toolbox_core/sync_tool.py
index 565bdc8c..db6febf8 100644
--- a/packages/toolbox-core/src/toolbox_core/sync_tool.py
+++ b/packages/toolbox-core/src/toolbox_core/sync_tool.py
@@ -108,8 +108,12 @@ def _bound_params(
         return self.__async_tool._bound_params
 
     @property
-    def _required_auth_params(self) -> Mapping[str, list[str]]:
-        return self.__async_tool._required_auth_params
+    def _required_authn_params(self) -> Mapping[str, list[str]]:
+        return self.__async_tool._required_authn_params
+
+    @property
+    def _required_authz_tokens(self) -> Sequence[str]:
+        return self.__async_tool._required_authz_tokens
 
     @property
     def _auth_service_token_getters(
diff --git a/packages/toolbox-core/src/toolbox_core/tool.py b/packages/toolbox-core/src/toolbox_core/tool.py
index 1d3c25e7..48a31dab 100644
--- a/packages/toolbox-core/src/toolbox_core/tool.py
+++ b/packages/toolbox-core/src/toolbox_core/tool.py
@@ -155,9 +155,13 @@ def _bound_params(
         return MappingProxyType(self.__bound_parameters)
 
     @property
-    def _required_auth_params(self) -> Mapping[str, list[str]]:
+    def _required_authn_params(self) -> Mapping[str, list[str]]:
         return MappingProxyType(self.__required_authn_params)
 
+    @property
+    def _required_authz_tokens(self) -> Sequence[str]:
+        return tuple(self.__required_authz_tokens)
+
     @property
     def _auth_service_token_getters(
         self,
diff --git a/packages/toolbox-core/tests/test_sync_tool.py b/packages/toolbox-core/tests/test_sync_tool.py
index dd481bab..43b03bc3 100644
--- a/packages/toolbox-core/tests/test_sync_tool.py
+++ b/packages/toolbox-core/tests/test_sync_tool.py
@@ -155,12 +155,23 @@ def test_toolbox_sync_tool_underscore_bound_params_property(
     assert toolbox_sync_tool._bound_params == mock_async_tool._bound_params
 
 
-def test_toolbox_sync_tool_underscore_required_auth_params_property(
+def test_toolbox_sync_tool_underscore_required_authn_params_property(
     toolbox_sync_tool: ToolboxSyncTool, mock_async_tool: MagicMock
 ):
-    """Tests the _required_auth_params property."""
+    """Tests the _required_authn_params property."""
     assert (
-        toolbox_sync_tool._required_auth_params == mock_async_tool._required_auth_params
+        toolbox_sync_tool._required_authn_params
+        == mock_async_tool._required_authn_params
+    )
+
+
+def test_toolbox_sync_tool_underscore_required_authz_tokens_property(
+    toolbox_sync_tool: ToolboxSyncTool, mock_async_tool: MagicMock
+):
+    """Tests the _required_authz_tokens property."""
+    assert (
+        toolbox_sync_tool._required_authz_tokens
+        == mock_async_tool._required_authz_tokens
     )
 
 
diff --git a/packages/toolbox-core/tests/test_tool.py b/packages/toolbox-core/tests/test_tool.py
index 0c624657..2e918c3d 100644
--- a/packages/toolbox-core/tests/test_tool.py
+++ b/packages/toolbox-core/tests/test_tool.py
@@ -575,16 +575,28 @@ def test_toolbox_tool_underscore_bound_params_property(toolbox_tool: ToolboxTool
         bound_params["new_param"] = "new_value"
 
 
-def test_toolbox_tool_underscore_required_auth_params_property(
+def test_toolbox_tool_underscore_required_authn_params_property(
     toolbox_tool: ToolboxTool,
 ):
-    """Tests the _required_auth_params property returns an immutable MappingProxyType."""
-    required_auth_params = toolbox_tool._required_auth_params
-    assert required_auth_params == {"message": ["service_a"]}
-    assert isinstance(required_auth_params, MappingProxyType)
+    """Tests the _required_authn_params property returns an immutable MappingProxyType."""
+    required_authn_params = toolbox_tool._required_authn_params
+    assert required_authn_params == {"message": ["service_a"]}
+    assert isinstance(required_authn_params, MappingProxyType)
     # Verify immutability
     with pytest.raises(TypeError):
-        required_auth_params["new_param"] = ["new_service"]
+        required_authn_params["new_param"] = ["new_service"]
+
+
+def test_toolbox_tool_underscore_required_authz_tokens_property(
+    toolbox_tool: ToolboxTool,
+):
+    """Tests the _required_authz_tokens property returns an immutable MappingProxyType."""
+    required_authz_tokens = toolbox_tool._required_authz_tokens
+    assert required_authz_tokens == ("service_b",)
+    assert isinstance(required_authz_tokens, tuple)
+    # Verify immutability
+    with pytest.raises(TypeError):
+        required_authz_tokens[0] = "new_service"
 
 
 def test_toolbox_tool_underscore_auth_service_token_getters_property(