目前底层代码可以支持这种json的定义形式： 
tasks = {
    "data_extraction": {
        "description": "Extract key financial data from the quarterly report",
        "status": "pending",
        "agent": financial_agent,
        "dependencies": []
    },
    "trend_analysis": {
        "description": "Analyze trends in the extracted data",
        "status": "pending",
        "agent": analyst_agent,
        "dependen...