添加了一个【自定义工具】，但是工具调用并不稳定，有时能成功调用，有时又产生幻觉，要怎么才能提高调用稳定性呢？

[332123342]

Initial Checks

• [X] I have searched GitHub for a duplicate issue and I'm sure this is something new
• [X] I have read and followed the docs & demos and still think this is a bug
• [X] I am confident that the issue is with modelscope-agent (not my code, or another library in the ecosystem)

What happened + What you expected to happen

正确调用的情况：

错误调用的情况：

Versions / Dependencies

Modelscope-agent: 0.7.0 python: 3.10 OS: centos8

Reproduction script

import os
import sys
import json
from typing import Dict, Optional, Union

sys.path.insert(0, "/data/workspace/modelscope-agent")

from modelscope_agent.agents import RolePlay
from modelscope_agent.tools.base import BaseTool
from modelscope_agent.tools import register_tool


@register_tool("UserDatabase")
class UserDatabase(BaseTool):
    description = "企业员工数据库，包含员工的性别、生日、职位信息"
    name = "UserDatabase"
    parameters: list = [
        {
            "name": "name",
            "type": "string",
            "description": "员工名字，所属查阅信息的员工姓名，如`张三",
            "required": True,
        }
    ]

    def __init__(self, cfg: Optional[Dict] = None):
        super().__init__(cfg)

        # 数据库存有员工基本信息
        self.database = {
            "李四": {"性别": "女", "生日": "10月3日", "职位": "画师"},
            "张三": {"性别": "男", "生日": "5月5日", "职位": "业务员"},
            "王五": {"性别": "男", "生日": "12月19日", "职位": "业务经理"},
        }

    def call(self, params: Union[str, dict], **kwargs) -> str:
        params = self._verify_args(params)

        name = params["name"]
        # 输入姓名返回员工信息
        return json.dumps(self.database.get(name, "查无此人"), ensure_ascii=False)


role_template = ""
llm_config = {
    "model": "qwen2:7b-instruct",
    "model_server": "ollama",
}
function_list = ["UserDatabase"]

bot = RolePlay(function_list=function_list, llm=llm_config, instruction=role_template)

response = bot.run(
    "职工张三的生日是在今年10月份吗？现在是2月份，距离张三的生日还有几个月？",
    remote=False,
    print_info=True,
)
text = ""
for chunk in response:
    text += chunk
print(text)

Issue Severity

None