mcp tool does not work if use object parameters

[skyshore2001]

When I use an object parameter, it cannot call the mcp tool correctly. The mcp server seems return a "$ref" parameter.

MCP tool example:

class OrderCond(BaseModel):
    id: Optional[int] = Field(default=None, description="订单编号，如101")
    orderSn: str = Field(default=None, description="订单编码，如ORDR-101")
    userPhone: str = Field(default=None, description="用户手机号")

@mcp.tool()
async def query_order(orderCond: OrderCond):