[Bug]:结构化输出，会调用generate_response工具，但是如果存在多层嵌套，工具会报错

下面是工具的返回消息：
{
"content":[
{
"id":"call_-7727915998354861090",
"metadata":{},
"name":"generate_response",
"output":[
{
"text":"Error: Parameter validation failed for tool 'generate_response': Schema validation error: Reference /$defs/DocumentExtract cannot be resolved\nPlease correct the parameters and try again."
}
]
}
],
"id":"c80ea208-9a88-4ac2-a940-0556ea8a3c9e",
"metadata":{},
"name":"指标提取智能体",
"role":"TOOL",
"timestamp":"2026-04-09 12:39:05.771"
}