tests/gateway/test_step_callback_compat.py::TestStepCallbackNormalization::test_dict_prev_tools_produce_string_tool_names
tests/gateway/test_step_callback_compat.py::TestStepCallbackNormalization::test_string_prev_tools_still_work
tests/gateway/test_step_callback_compat.py::TestStepCallbackNormalization::test_empty_prev_tools
tests/gateway/test_step_callback_compat.py::TestStepCallbackNormalization::test_joinable_for_hook_example