api.add_action<
	{
		type_id : int;
		description ?: null|string;
		tag_ids ?: Array<int>;
		expression_ids ?: Array<int>;
	},
	int
>
(
	{
		"name": "concept_add",
		"execution": async function (input)
		{
			const concept_entity : entities.concept =
			{
				"type_id": input.type_id,
				"description": helpers.object.fetch<null|string>(input, "description", null),
				"tag_ids": input.tag_ids,
				"expression_ids": input.expression_ids,
			};
			const concept_id : int = await services.concept.add(concept_entity);
			
			return Promise.resolve<int>(concept_id);
		}
	}
);