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nanobot源码学习(二):Tool 与 Provider 抽象

nanobot源码学习(二):Tool 与 Provider 抽象

上一篇讲了消息总线,两个 asyncio.Queue 把"消息入口"和"处理逻辑"解耦。看完应该能理解:新增一个聊天渠道(比如微信),不用改任何业务代码

不过 Agent 真正干活还得靠另一个能力——调工具(Tool)。

没有 Tool 的 LLM 是个聊天机器。有 Tool 的 LLM 才能读文件、跑 shell、查数据库、发请求。这篇就讲 nanobot 怎么把"千差万别的能力"统一成同一个接口,以及怎么在不修改 nanobot 源码的前提下无限扩展。

对应教程仓库的 s02(Tool 抽象) + s03(Provider 抽象) 两个章节。


1. 第一个问题:Tool 怎么设计才不会被 if-else 淹没

假设 LLM 决定要读我电脑上一个文件。直觉的写法:


  
    
    
    
  
  python
def handle_tool_call(name, args):
    if name == "read_file":
        return open(args["path"]).read()
    elif name == "write_file":
        with open(args["path"], "w"as f:
            f.write(args["content"])
    elif name == "run_shell":
        return subprocess.run(args["cmd"], shell=True).stdout
    elif name == "search_web":
        return requests.get(args["url"]).text
    # ... 加一个 tool 就要加一个 elif

加到第 5 个还能接受,加到第 10 个这个函数已经没人想动了。

更糟的是,每个新 Tool 还要让 LLM 知道它存在。你得把 Tool 的描述、参数 schema 喂给 LLM,否则 LLM 不知道有 read_file 这回事。每次加 Tool,你得改两处:handle_tool_call 函数 + 给 LLM 的 schema 列表。

nanobot 的解法:把"Tool 的描述"和"Tool 的实现"绑在一起,用一个注册表统一管。


2. nanobot的设计


  
    
    
    
  
  python
class Tool:
    """所有 Tool 的基类。子类只需实现 4 个字段。"""
    name: str = ""
    description: str = ""
    parameters: dict = {}
    async def run(self, **kwargs) -> str:
        raise NotImplementedError


class ReadFileTool(Tool):
    name = "read_file"
    description = "读取文件内容,返回 utf-8 文本"
    parameters = {
        "type""object",
        "properties": {
            "path": {"type""string""description""文件绝对或相对路径"},
        },
        "required": ["path"],
    }

    async def run(self, path: str) -> str:
        try:
            with open(path) as f:
                return f.read()
        except Exception as e:
            return f"ERROR: {e}"


class ToolRegistry:
    """name -> Tool 的注册表。"""
    def __init__(self):
        self._tools: dict[str, Tool] = {}

    def register(self, tool: Tool):
        self._tools[tool.name] = tool

    def to_anthropic_tools(self) -> list[dict]:
        """导出给 LLM 的 schema 列表。"""
        return [
            {"name": t.name, "description": t.description, "input_schema": t.parameters}
            for t in self._tools.values()
        ]

    async def dispatch(self, name: str, args: dict) -> str:
        """LLM 决定调哪个 tool 时,找到对应实例执行。"""
        return await self._tools[name].run(**args)

这段代码解决了三个问题:

问题 1:怎么加新 Tool 不改 if-else? 答:写一个继承 Tool 的类,调用 registry.register(MyTool()) 就完事。dispatch 自动按 name 路由,不用动 registry 代码。

问题 2:怎么让 LLM 知道有哪些 Tool 可用? 答:调 registry.to_anthropic_tools(),自动把每个 Tool 的 name / description / parameters 拼成 LLM 能看懂的 schema。加新 Tool 不需要再维护一份独立的 schema 列表

问题 3:怎么让"第三方写的新 Tool"被 nanobot 自动发现? 答:教程里提了一句 pkgutil + entry-point,s02 重点是设计思想。要看真实的 entry-point 注册可以翻 nanobot 真实代码的 nanobot/skills/ 目录。


3. 第二个问题:换 LLM 厂商要不要改业务代码

光有 Tool 还不够,Tool 是给 LLM 用的,但 LLM 本身要换怎么办?

Anthropic、OpenAI、DeepSeek、Gemini、智谱、阿里 DashScope、Moonshot、Groq、vLLM、OpenRouter……每家 API 都不一样。每家 SDK 的调用方式、返回结构、错误码都不同。

如果业务代码里到处都是 from openai import OpenAI,那想换到 DeepSeek 就得满世界改。

nanobot 的解法:所有 LLM 都接成同一个 LLMProvider 接口,业务代码只认这个接口。

s03 章节的简化版:


  
    
    
    
  
  python
class LLMProvider(ABC):
    """所有 LLM 厂商适配层的基类。"""
    @abstractmethod
    async def chat(self, user_text: str) -> str:
        raise NotImplementedError


class AnthropicProvider(LLMProvider):
    def __init__(self, client: Anthropic | None = None):
        self._client = client or _shared_client()

    async def chat(self, user_text: str) -> str:
        resp = self._client.messages.create(
            model=MODEL_ID,
            max_tokens=1024,
            messages=[{"role""user""content": user_text}],
        )
        for b in resp.content:
            if hasattr(b, "text"):
                return b.text
        return ""

业务代码拿到的是 LLMProvider,不知道背后是 Anthropic 直连还是走代理。


4. ProviderSpec:所有厂商的"身份证"

光有 LLMProvider 还不够——怎么知道支持哪些厂商?哪家要什么 env 变量?哪家要 base_url?

s03 的解法是维护一份元数据单一来源表


  
    
    
    
  
  python
@dataclass
class ProviderSpec:
    name: str            # spec id
    display_name: str    # 给人看的名字
    env_key: str         # 该 provider 需要的 env 变量
    base_url: str | None  # None = 走 SDK 默认;有值 = 走代理


PROVIDERS: list[ProviderSpec] = [
    ProviderSpec(
        name="anthropic",
        display_name="Anthropic 直连",
        env_key="ANTHROPIC_API_KEY",
        base_url=None,
    ),
    ProviderSpec(
        name="proxy",
        display_name="Anthropic 兼容代理(走 .env)",
        env_key="ANTHROPIC_BASE_URL",
        base_url=os.getenv("ANTHROPIC_BASE_URL"),
    ),
]

这份表是新增厂商的唯一入口。要加一个 DeepSeek?往 PROVIDERS 列表加一行;要加一个本地 Ollama?加一行 base_url 是 http://localhost:11434/v1 的 spec。

业务代码永远不写 if spec.name == “anthropic”。它只调 factory.create("deepseek"),拿到一个 LLMProvider 实例就能用。


5. 两个常见误区

5.1 误区 1:业务代码 import 具体 SDK


  
    
    
    
  
  python
# 反例
from openai import OpenAI
client = OpenAI()

resp = client.chat.completions.create(
    model="gpt-4",
    messages=[{"role""user""content": text}],
)

这种写法有一个隐藏代价——想换 LLM 厂商时到处搜替换字符串

正确做法:用 LLMProvider 抽象 + ProviderSpec 单一来源表:

  • 业务代码永远不 import 具体 SDK,只调 factory.create("xxx").chat(...)
  • 切换 = 改环境变量(PROVIDER=deepseek),业务代码不动
  • 新增厂商 = 加一行 ProviderSpec,核心 Provider 实现一行不动

5.2 误区 2:Tool 不走注册表


  
    
    
    
  
  python
# 反例
def handle_tool_call(name, args):
    if name == "read_file"return open(args["path"]).read()
    elif name == "write_file": ...

 函数一多根本无法维护。

正确做法:继承 Tool 基类 + registry.register()


  
    
    
    
  
  python
class MyTool(Tool):
    name = "my_tool"
    description = "..."
    parameters = {...}
    async def run(self, **kwargs):
        ...

registry.register(MyTool())

加新 Tool 真的就是"写一个类 + register 一下"两步。registry.to_anthropic_tools() 自动把 schema 喂给 LLM,registry.dispatch() 自动按 name 路由。


6. 下一篇

下一篇看 s04 + s05 章节,讲 Agent 状态机——一条用户消息是怎么走完 7 个状态、跑完一整轮 LLM 对话的。状态机是 nanobot 最核心的编排逻辑,把消息总线、Tool、Provider 三个机制串成完整的一轮对话


7. 参考资料

  • nanobot 源码:https://github.com/HKUDS/nanobot
  • nanobot-tutorial(14 章配套教程):https://github.com/yaoweizhang/nanobot_tutorial
  • nanobot 官方 Roadmap:https://github.com/HKUDS/nanobot/discussions/431

跟读建议:跑 python s02_tool/code.py 体验一下"LLM 调 read_file 读文件"的完整流程,再对照 nanobot/skills/ 看真实 Tool 注册代码。

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-07-23 06:39:18 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/776829.html
  2. 运行时间 : 0.203479s [ 吞吐率:4.91req/s ] 内存消耗:4,775.35kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=5f700822d5dcb204078ee24ee1a11aa4
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  1. CONNECT:[ UseTime:0.000955s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001756s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.013098s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003380s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001871s ]
  6. SELECT * FROM `set` [ RunTime:0.001337s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001975s ]
  8. SELECT * FROM `article` WHERE `id` = 776829 LIMIT 1 [ RunTime:0.001481s ]
  9. UPDATE `article` SET `lasttime` = 1784759959 WHERE `id` = 776829 [ RunTime:0.042462s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.003870s ]
  11. SELECT * FROM `article` WHERE `id` < 776829 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001663s ]
  12. SELECT * FROM `article` WHERE `id` > 776829 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.012706s ]
  13. SELECT * FROM `article` WHERE `id` < 776829 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.019018s ]
  14. SELECT * FROM `article` WHERE `id` < 776829 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005849s ]
  15. SELECT * FROM `article` WHERE `id` < 776829 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003895s ]
0.205994s