json_schema: {
    "properties": {
      "date_range": {
        "properties": {
          "from_date": {
            "description": "The start date of the date range",
            "format": "date",
            "type": "string"
          },
          "to_date": {
            "description": "The end date of the date range",
            "format": "date",
            "type": "string"
          }
        },
        "type": "object"
      },
      "keywords": {
        "description": "The keywords to search for in news articles",
        "items": {
          "type": "string"
        },
        "type": "array"
      },
      "source": {
        "description": "The source of the news articles",
        "type": "string"
      }
    },
    "required": [
      "keywords"
    ],
    "type": "object"
  }