def pipeline_configs(self):
        """
        Property for accessing :class:`PipelineConfigManager` instance, which is used to manage pipeline configurations.

        :rtype: yagocd.resources.pipeline_config.PipelineConfigManager
        """
        if self._pipeline_config_manager is None:
            self._pipeline_config_manager = PipelineConfigManager(session=self._session)
        return self._pipeline_config_manager