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ToolsNode 源码:LLM 返回 tool_calls 之后发生了什么(第53篇-E39)

ToolsNode 源码:LLM 返回 tool_calls 之后发生了什么(第53篇-E39)

系列「企业级 AI Agent 实现拆解」E39 篇,Part 9 源码深度篇第四章。上一篇 拆了 Callback 系统。这篇拆工具执行:LLM 返回一条包含 tool_calls 字段的消息之后,Eino 是怎么把它变成实际的 Go 函数调用,最终返回 ToolMessage 的。

读完这篇你会知道

  • Tool 接口体系:BaseTool / InvokableTool / StreamableTool 的分工
  • ToolsNode
     构建期做了什么:convTools → toolsTuple
  • genToolCallTasks
    :从 LLM 输出提取任务列表的细节
  • 并行执行:parallelRunToolCall 怎么用 goroutine
  • InferTool
    :从 Go struct 自动推导 JSON Schema
  • HITL 中断:tool 可以抛出 interrupt 挂起等待人工审核

全景

LLM 响应(AssistantMessage)    ├── Role"assistant"    └── ToolCalls: [            {ID:"call_1"Function:{Name:"search"Arguments:"{\"q\":\"eino\"}"}},            {ID:"call_2"Function:{Name:"calc",   Arguments:"{\"expr\":\"2+2\"}"}},        ]                    ToolsNode.Invoke(ctx, msg)    ├── genToolCallTasks()   提取任务列表,处理别名和参数    ├── parallelRunToolCall()   goroutine 并行执行(默认)           ├── goroutine: search.InvokableRun(ctx, `{"q":"eino"}`)           └── 主goroutine: calc.InvokableRun(ctx, `{"expr":"2+2"}`)    └── 收集结果  []*schema.Message{            ToolMessage("search result""call_1"),            ToolMessage("4""call_2"),        }                    追加到 messages 列表,继续下一轮 LLM 调用

Tool 接口体系

Eino 把 Tool 分成四个接口,按功能正交叠加:

// 最小接口:只提供元数据(给 LLM 看 schema 用)type BaseTool interface {    Info(ctx context.Context) (*schema.ToolInfo, error)}// 可执行工具(返回字符串)type InvokableTool interface {    BaseTool    InvokableRun(ctx context.Context, argumentsInJSON string, opts ...Option) (stringerror)}// 流式工具(分 chunk 返回字符串)type StreamableTool interface {    BaseTool    StreamableRun(ctx context.Context, argumentsInJSON string, opts ...Option) (*schema.StreamReader[string], error)}// 增强工具(返回多模态内容:文本/图片/音频/文件)type EnhancedInvokableTool interface {    BaseTool    InvokableRun(ctx context.Context, toolArgument *schema.ToolArgument, opts ...Option) (*schema.ToolResult, error)}

优先级规则:ToolsNode 在执行时,如果一个 tool 同时实现了 Enhanced 和普通接口,Enhanced 优先。没有实现 StreamableTool 但实现了 InvokableTool 的,框架自动把它包装成流式(反之亦然)——所以你实现任意一个,两种执行模式都能用。


构建期:toolsTuple 是核心

NewToolNode(ctx, conf) 调用 convTools(),构建一个 toolsTuple

type toolsTuple struct {    indexes        map[string]int              // tool 名 → 数组下标(O(1) 查找)    meta           []*executorMeta             // callback 元信息    endpoints      []InvokableToolEndpoint     // 普通执行入口    streamEndpoints []StreamableToolEndpoint   // 流式执行入口    // ... Enhanced 变种    canonicalNames []string  // 规范名称列表(支持 alias 时用)    toolInfos      []*schema.ToolInfo  // JSON Schema(用于 alias 验证)}

每个 tool 在构建时被封装成 endpoint 函数:

funcwrapToolCall(it InvokableTool, middlewares []Middleware, needCallback bool) InvokableToolEndpoint {    // 1. 如果需要 Callback,套一层 invokableToolWithCallback    if needCallback {        it = &invokableToolWithCallback{it: it}    }    // 2. 中间件逆序 wrap(最先注册的最外层)    return middleware(func(ctx, input) (*ToolOutput, error) {        result, err := it.InvokableRun(ctx, input.Arguments, input.CallOptions...)        return &ToolOutput{Result: result}, err    })}

关键点: 中间件在这里完成 wrap,每次执行只需直接调 endpoint(ctx, input),不需要每次都遍历中间件列表。


执行期:从 ToolCalls 到任务列表

Invoke 核心流程:

func(tn *ToolsNode) Invoke(ctx, input *schema.Message, opts...) ([]*schema.Message, error) {    // 1. 从 AssistantMessage 提取任务列表    tasks, err := tn.genToolCallTasks(ctx, tuple, input, ...)    // 2. 并行或顺序执行    if tn.executeSequentially {        sequentialRunToolCall(ctx, runToolCallTaskByInvoke, tasks, ...)    } else {        parallelRunToolCall(ctx, runToolCallTaskByInvoke, tasks, ...)    }    // 3. 收集结果,构建 ToolMessage 列表    output := make([]*schema.Message, n)    for i := 0; i < n; i++ {        output[i] = schema.ToolMessage(tasks[i].output, tasks[i].callID, ...)    }    return output, nil}

genToolCallTasks 负责从 input.ToolCalls 生成任务列表,顺带处理:

  1. 参数别名
    remapArgs(args, aliasMap) 把模型返回的参数名 alias 映射到规范名
  2. 参数预处理
    toolArgumentsHandler(ctx, name, args) 允许在执行前改写参数
  3. 未知工具
    :模型幻觉调了不存在的 tool → 走 unknownToolHandler(不设置则直接报错)

并行执行:goroutine 策略

LLM 一次可以返回多个 tool_calls(比如同时搜索 + 计算)。Eino 默认并行执行:

funcparallelRunToolCall(ctx, run, tasks, opts) {    if len(tasks) == 1 {        run(ctx, &tasks[0], opts...)  // 只有一个 → 不开 goroutine        return    }    var wg sync.WaitGroup    for i := 1; i < len(tasks); i++ {  // i=1 起,注意        wg.Add(1)        go func(t *toolCallTask) {            defer wg.Done()            defer func() {                if panicErr := recover(); panicErr != nil {                    t.err = safe.NewPanicErr(panicErr, debug.Stack())                }            }()            run(ctx, t, opts...)        }(ctx, &tasks[i], opts...)    }    run(ctx, &tasks[0], opts...)  // tasks[0] 在主 goroutine 执行    wg.Wait()}

设计细节:

  • tasks[0]
     在主 goroutine 跑,tasks[1:] 各开一个 goroutine——减少一次 goroutine 创建开销
  • goroutine 里有 recover()——单个 tool panic 不会崩进程,错误存进 task.err
  • 每个 task 独立写 task.output / task.err,不共享写,无锁

InferTool:从 Go struct 到 JSON Schema

最常用的 tool 创建方式——你只写业务逻辑,JSON Schema 自动推导:

type SearchInput struct {    Query  string `json:"q"    jsonschema:"description=搜索关键词,required"`    Limit  int    `json:"limit" jsonschema:"description=返回条数,default=10"`}type SearchOutput struct {    Results []string `json:"results"`}searchTool, err := utils.InferTool(    "web_search",    "搜索互联网内容,返回相关文档列表",    func(ctx context.Context, input SearchInput) (SearchOutput, error) {        // 实际业务逻辑        results := doSearch(input.Query, input.Limit)        return SearchOutput{Results: results}, nil    },)

InferTool 内部:

  1. goStruct2ToolInfo[T]()
     用反射 + jsonschema 标签把 SearchInput 转成 JSON Schema → 存进 schema.ToolInfo
  2. 返回的 InvokableTool 实现里,InvokableRun 会把 LLM 的 JSON 字符串 sonic.Unmarshal 成 SearchInput,再调你的函数,最后把 SearchOutputsonic.Marshal 成字符串返回

HITL 中断:tool 可以挂起

工具执行时可以抛出"需要人工审核"的 interrupt,让 Agent 暂停等待:

func(t *MyTool) InvokableRun(ctx context.Context, args string, opts ...tool.Option) (stringerror) {    input := parseArgs(args)    if input.Amount > 10000 {        // 超额转账需要人工审批 → 抛出 interrupt,不是普通 error        return "", tool.NewInterruptError("需要人工审核:转账金额超过限额")    }    return doTransfer(input), nil}

ToolsNode 在收集结果时检测:

for i := 0; i < n; i++ {    if tasks[i].err != nil {        info, ok := IsInterruptRerunError(tasks[i].err)        if !ok {            return nil, fmt.Errorf("tool failed: %w", tasks[i].err)  // 普通错误        }        rerunExtra.RerunTools = append(rerunExtra.RerunTools, tasks[i].callID)        errs = append(errs, WrapInterruptAndRerunIfNeeded(...))  // HITL 错误    }}if len(errs) > 0 {    return nil, CompositeInterrupt(ctx, rerunExtra, rerunState, errs...)    // ↑ 已执行成功的 tool 结果存进 rerunState,恢复时不重复执行}

恢复时 ToolsNode 从 rerunState 读出已执行成功的结果,只重新执行被 interrupt 的那些——部分完成的 batch 不会全部重跑。


小结

ToolsNode 的核心设计:

  1. 构建期做重活
    convTools 把 tool 列表转成 name→index map + endpoint 函数,中间件在构建时 wrap,执行时零开销
  2. 执行时三步走
    genToolCallTasks(解析 LLM 输出)→ parallelRunToolCall(goroutine 并发)→ 收集结果成 ToolMessage 列表
  3. 自动互补
    :只实现 InvokableTool 自动得到 StreamableTool,反之亦然
  4. HITL 内置
    :tool 抛 interrupt → 保存已执行结果 → Agent 暂停等待人工 → 恢复时只重跑 interrupt 的那部分

代码来源:eino/compose/tool_node.go · eino/components/tool/interface.go

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-07-15 15:49:49 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/861209.html
  2. 运行时间 : 0.098755s [ 吞吐率:10.13req/s ] 内存消耗:4,707.63kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=5cd528d701704dadfbf579d2904b0fe3
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  1. CONNECT:[ UseTime:0.000627s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000856s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000307s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000299s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000499s ]
  6. SELECT * FROM `set` [ RunTime:0.000212s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000569s ]
  8. SELECT * FROM `article` WHERE `id` = 861209 LIMIT 1 [ RunTime:0.000475s ]
  9. UPDATE `article` SET `lasttime` = 1784101789 WHERE `id` = 861209 [ RunTime:0.001048s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000252s ]
  11. SELECT * FROM `article` WHERE `id` < 861209 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000432s ]
  12. SELECT * FROM `article` WHERE `id` > 861209 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000470s ]
  13. SELECT * FROM `article` WHERE `id` < 861209 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000691s ]
  14. SELECT * FROM `article` WHERE `id` < 861209 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000643s ]
  15. SELECT * FROM `article` WHERE `id` < 861209 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000676s ]
0.100712s