diff --git a/src/google/adk/tools/application_integration_tool/integration_connector_tool.py b/src/google/adk/tools/application_integration_tool/integration_connector_tool.py
index b4c60714215..758f5fefdc5 100644
--- a/src/google/adk/tools/application_integration_tool/integration_connector_tool.py
+++ b/src/google/adk/tools/application_integration_tool/integration_connector_tool.py
@@ -173,6 +173,12 @@ async def run_async(
           'message': 'Needs your authorization to access your data.',
       }
 
+    # The access token added below must stay out of this log line and out of
+    # the caller's args, which are also handed to after-tool callbacks and
+    # recorded on the tool span.
+    logger.info('Running tool: %s with args: %s', self.name, args)
+    args = args.copy()
+
     # Attach parameters from auth into main parameters list
     if auth_result.auth_credential:
       # Attach parameters from auth into main parameters list
@@ -192,7 +198,6 @@ async def run_async(
     args['entity'] = self._entity
     args['operation'] = self._operation
     args['action'] = self._action
-    logger.info('Running tool: %s with args: %s', self.name, args)
     return await self._rest_api_tool.call(args=args, tool_context=tool_context)
 
   def __str__(self):
diff --git a/src/google/adk/tools/openapi_tool/openapi_spec_parser/rest_api_tool.py b/src/google/adk/tools/openapi_tool/openapi_spec_parser/rest_api_tool.py
index b9f91f8e212..843339434ed 100644
--- a/src/google/adk/tools/openapi_tool/openapi_spec_parser/rest_api_tool.py
+++ b/src/google/adk/tools/openapi_tool/openapi_spec_parser/rest_api_tool.py
@@ -548,8 +548,11 @@ async def call(
           "message": "Needs your authorization to access your data.",
       }
 
-    # Attach parameters from auth into main parameters list
-    api_params, api_args = self._operation_parser.get_parameters().copy(), args
+    # Work on a copy of args: the caller's dict is also handed to after-tool
+    # callbacks and recorded on the tool span, so the defaults and auth
+    # parameters added below must not land in it.
+    api_params = self._operation_parser.get_parameters().copy()
+    api_args = args.copy()
 
     # Add any required arguments that are missing and have defaults:
     for api_param in api_params:
diff --git a/tests/unittests/tools/application_integration_tool/test_integration_connector_tool.py b/tests/unittests/tools/application_integration_tool/test_integration_connector_tool.py
index c2e0ea15592..2b0a27fe8df 100644
--- a/tests/unittests/tools/application_integration_tool/test_integration_connector_tool.py
+++ b/tests/unittests/tools/application_integration_tool/test_integration_connector_tool.py
@@ -282,6 +282,43 @@ async def test_run_with_auth_async(
     assert result == {"status": "success", "data": "mock_data"}
 
 
+@pytest.mark.asyncio
+async def test_run_with_auth_async_keeps_token_out_of_caller_args_and_logs(
+    integration_tool_with_auth, mock_rest_api_tool, caplog
+):
+  """The caller's args also feed after-tool callbacks and the tool span."""
+  input_args = {"user_id": "user123"}
+
+  with mock.patch.object(
+      ToolAuthHandler, "from_tool_context", autospec=True
+  ) as mock_from_tool_context:
+    mock_from_tool_context.return_value.prepare_auth_credentials = (
+        mock.AsyncMock(
+            return_value=AuthPreparationResult(
+                state="done",
+                auth_credential=AuthCredential(
+                    auth_type=AuthCredentialTypes.HTTP,
+                    http=HttpAuth(
+                        scheme="bearer",
+                        credentials=HttpCredentials(token="secret-token"),
+                    ),
+                ),
+            )
+        )
+    )
+    with caplog.at_level("INFO"):
+      await integration_tool_with_auth.run_async(
+          args=input_args, tool_context={}
+      )
+
+  assert input_args == {"user_id": "user123"}
+  sent_args = mock_rest_api_tool.call.call_args.kwargs["args"]
+  assert sent_args["dynamic_auth_config"] == {
+      "oauth2_auth_code_flow.access_token": "secret-token"
+  }
+  assert "secret-token" not in caplog.text
+
+
 class TestIntegrationConnectorToolWithJsonSchema:
 
   def test_get_declaration_with_json_schema_feature_enabled(
diff --git a/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_rest_api_tool.py b/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_rest_api_tool.py
index 5cd2d340e87..00b89adcfc9 100644
--- a/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_rest_api_tool.py
+++ b/tests/unittests/tools/openapi_tool/openapi_spec_parser/test_rest_api_tool.py
@@ -340,6 +340,42 @@ async def test_call_success(
     # Check the result
     assert result == {"result": "success"}
 
+  @patch(
+      "google.adk.tools.openapi_tool.openapi_spec_parser.rest_api_tool._request"
+  )
+  @pytest.mark.asyncio
+  async def test_call_does_not_add_auth_params_to_caller_args(
+      self,
+      mock_request,
+      mock_tool_context,
+      sample_endpoint,
+      sample_operation,
+  ):
+    """The caller's args also feed after-tool callbacks and the tool span."""
+    mock_response = MagicMock()
+    mock_response.json.return_value = {"result": "success"}
+    mock_request.return_value = mock_response
+    auth_scheme, auth_credential = token_to_scheme_credential(
+        "apikey", "header", "X-API-Key", "secret-api-key"
+    )
+    tool = RestApiTool(
+        name="test_tool",
+        description="Test Tool",
+        endpoint=sample_endpoint,
+        operation=sample_operation,
+        auth_scheme=auth_scheme,
+        auth_credential=auth_credential,
+    )
+    args = {"testBodyParam": "value"}
+
+    await tool.call(args=args, tool_context=mock_tool_context)
+
+    assert args == {"testBodyParam": "value"}
+    assert (
+        mock_request.call_args.kwargs["headers"]["X-API-Key"]
+        == "secret-api-key"
+    )
+
   @patch(
       "google.adk.tools.openapi_tool.openapi_spec_parser.rest_api_tool._request"
   )