diff --git a/packages/toolbox-core/src/toolbox_core/tool.py b/packages/toolbox-core/src/toolbox_core/tool.py
index 98d04e17..5a9bca6e 100644
--- a/packages/toolbox-core/src/toolbox_core/tool.py
+++ b/packages/toolbox-core/src/toolbox_core/tool.py
@@ -239,7 +239,7 @@ async def __call__(self, *args: Any, **kwargs: Any) -> str:
             for s in self.__required_authn_params.values():
                 req_auth_services.update(s)
             req_auth_services.update(self.__required_authz_tokens)
-            raise ValueError(
+            raise PermissionError(
                 f"One or more of the following authn services are required to invoke this tool"
                 f": {','.join(req_auth_services)}"
             )
diff --git a/packages/toolbox-core/tests/test_e2e.py b/packages/toolbox-core/tests/test_e2e.py
index c8111b6f..8920bc3b 100644
--- a/packages/toolbox-core/tests/test_e2e.py
+++ b/packages/toolbox-core/tests/test_e2e.py
@@ -147,7 +147,7 @@ async def test_run_tool_no_auth(self, toolbox: ToolboxClient):
         """Tests running a tool requiring auth without providing auth."""
         tool = await toolbox.load_tool("get-row-by-id-auth")
         with pytest.raises(
-            Exception,
+            PermissionError,
             match="One or more of the following authn services are required to invoke this tool: my-test-auth",
         ):
             await tool(id="2")
@@ -188,7 +188,7 @@ async def test_run_tool_param_auth_no_auth(self, toolbox: ToolboxClient):
         """Tests running a tool with a param requiring auth, without auth."""
         tool = await toolbox.load_tool("get-row-by-email-auth")
         with pytest.raises(
-            ValueError,
+            PermissionError,
             match="One or more of the following authn services are required to invoke this tool: my-test-auth",
         ):
             await tool()
diff --git a/packages/toolbox-core/tests/test_sync_client.py b/packages/toolbox-core/tests/test_sync_client.py
index 4b43e466..28f2b27b 100644
--- a/packages/toolbox-core/tests/test_sync_client.py
+++ b/packages/toolbox-core/tests/test_sync_client.py
@@ -541,7 +541,7 @@ def test_auth_with_load_tool_fail_no_token(
 
         tool = sync_client.load_tool(tool_name_auth)
         with pytest.raises(
-            ValueError,
+            PermissionError,
             match="One or more of the following authn services are required to invoke this tool: my-auth-service",
         ):
             tool(argA=15, argB=True)
diff --git a/packages/toolbox-core/tests/test_sync_e2e.py b/packages/toolbox-core/tests/test_sync_e2e.py
index 885724e9..f2730e47 100644
--- a/packages/toolbox-core/tests/test_sync_e2e.py
+++ b/packages/toolbox-core/tests/test_sync_e2e.py
@@ -129,7 +129,7 @@ def test_run_tool_no_auth(self, toolbox: ToolboxSyncClient):
         """Tests running a tool requiring auth without providing auth."""
         tool = toolbox.load_tool("get-row-by-id-auth")
         with pytest.raises(
-            Exception,
+            PermissionError,
             match="One or more of the following authn services are required to invoke this tool: my-test-auth",
         ):
             tool(id="2")
@@ -156,7 +156,7 @@ def test_run_tool_param_auth_no_auth(self, toolbox: ToolboxSyncClient):
         """Tests running a tool with a param requiring auth, without auth."""
         tool = toolbox.load_tool("get-row-by-email-auth")
         with pytest.raises(
-            ValueError,
+            PermissionError,
             match="One or more of the following authn services are required to invoke this tool: my-test-auth",
         ):
             tool()