json_schema: {
    "properties": {
      "date_range": {
        "properties": {
          "end_date": {
            "description": "The end date of news articles in YYYY-MM-DD format",
            "type": "string"
          },
          "start_date": {
            "description": "The start date of news articles in YYYY-MM-DD format",
            "type": "string"
          }
        },
        "type": "object"
      },
      "keyword": {
        "description": "The keyword to search for in news articles",
        "type": "string"
      },
      "source": {
        "description": "The source of news articles to filter",
        "type": "string"
      }
    },
    "type": "object"
  }