过程监听与节点报告

App 订阅 Core 执行事实；节点报告自身 usedModel，并用实例式子日志先记意图、再补结果，Loop 负责身份和日志。

execution.observe.event 是旁路监听：观察失败不改变任务结果，也不形成交付背压。模型正文 sink.output 是另一种端口，Core 会按序等待并传播交付失败。不要把旁路日志监听器当作可靠的终端输出队列。

Workflow 节点在执行期间调用 context.report({usedModel, payload})，或提供 report(update, context) 描述完成细节。usedModel 表示本次节点自身上报的模型使用，未上报为未知，不汇总子节点。子日志必须通过 context.createSubFlowLogger() 创建实例，write 成功返回 ID、失败返回 -1，fix 成功返回 true、失败返回 false，readAll 读不可变的全量记录；不接收手写数组或普通对象。write 当时即记入既有 node.progress，短路仍保留计划，fix 追加修订且不改写历史事件。节点不创建运行身份，不反复传 diagnostics；Core 自动记录节点进入、转移、错误、模型和工具事实。App 决定哪些状态向用户展示；并非所有 Provider 都有或允许展示模型的内部思考正文。

write 的 name、kind 必填，status 默认为 planned；ID、初始顺序、createdAtMs 和 revision 由实例生成。running 表示实际开始，success、error、cancelled、skipped 为终态。fix 不能重开终态或覆盖已确定的事实，但可在本次执行仍活跃时补缺失结果。payload 接受 JSON 数据，父步骤和后继 ID 必须属于同一次节点执行的记录；readAll 是持续只读查询，记录不通过 report 提交。节点结束或取消后 write 返回 -1、fix 返回 false，持有实例的调用方仍可 readAll。完整 logger 可以 fork(subnodeId) 创建独立的 ScopedSubFlowLogger 委托实例，它不存储记录，write 自动绑定分组，fix 只能关联本分组的原始 write；不能再次 fork 或传给 invoke。readAll 始终可读同一份全量记录。subnodeId 和业务 type 均可自定义，operation 单独表示 write／fix。

简易 agent.run(step) 与工具执行上下文同样提供 report 和 createSubFlowLogger。工具的 debugSteps(result, context) 使用本次 context 的 logger 直接记账，不返回或提交 logger；Workflow 的完成回调 report(update, context) 返回报告对象。两种完成回调均只在内容采集获准时求值，元数据标记应在执行中通过 context.report 提交。日志中的 subSteps 是规范化数组，payload.subStep 是 write／fix 的进度元数据；未获内容授权的消费者只接收获准元数据。

createDiagnostics 配置同一事实源的可选日志消费，不是另一份持久 journal。正文仍受内容记录策略控制。事件中的 run/span/invocation 关联是 Core 执行身份，不是 App message ID；App 自行关联自己的消息记录。

由简到繁的同业务示例

监听任务经过的节点与模型事件

入门 · Node.js

TypeScript

import { AgentCoreEngine, defineWorkflow, route } from '@jangts/agent-core/engine';

type State = { name: string; answer?: string };
const workflow = defineWorkflow<State, string>({
  id: 'greeting',
  nodes: [{
    id: 'greet', description: '根据本次姓名生成问候', startsRound: true,
    run: state => ({ answer: '你好，' + state.name }),
    routes: [route.deliver('answer')],
  }],
});
const agent = new AgentCoreEngine({ workflow, execution: {
  observe: { event(event) { console.log(event.type, event.eventId); } },
} });
console.log(await agent.run({ name: 'Ivan' }));

JavaScript

import { AgentCoreEngine, defineWorkflow, route } from '@jangts/agent-core/engine';
const workflow = defineWorkflow({
    id: 'greeting',
    nodes: [{
            id: 'greet', description: '根据本次姓名生成问候', startsRound: true,
            run: state => ({ answer: '你好，' + state.name }),
            routes: [route.deliver('answer')],
        }],
});
const agent = new AgentCoreEngine({ workflow, execution: {
        observe: { event(event) { console.log(event.type, event.eventId); } },
    } });
console.log(await agent.run({ name: 'Ivan' }));

节点执行时报告业务阶段

配置 · Node.js

节点只报告它知道的事实；Core 负责节点身份和执行关联。

TypeScript

import { AgentCoreEngine, defineWorkflow, route } from '@jangts/agent-core/engine';
type State = { name: string; answer?: string };
const workflow = defineWorkflow<State, string>({ id: 'greeting', nodes: [{
  id: 'greet', description: '生成问候', startsRound: true,
  run(state, context) {
    context.report({ payload: { phase: 'formatting' } });
    return { answer: '你好，' + state.name };
  }, routes: [route.deliver('answer')],
}] });
const agent = new AgentCoreEngine({ workflow, execution: {
  observe: { event(event) { console.log(event.type); } },
} });
console.log(await agent.run({ name: 'Ivan' }));

JavaScript

import { AgentCoreEngine, defineWorkflow, route } from '@jangts/agent-core/engine';
const workflow = defineWorkflow({ id: 'greeting', nodes: [{
            id: 'greet', description: '生成问候', startsRound: true,
            run(state, context) {
                context.report({ payload: { phase: 'formatting' } });
                return { answer: '你好，' + state.name };
            }, routes: [route.deliver('answer')],
        }] });
const agent = new AgentCoreEngine({ workflow, execution: {
        observe: { event(event) { console.log(event.type); } },
    } });
console.log(await agent.run({ name: 'Ivan' }));

先记异步计划，再补结果

配置 · Node.js

受限 logger 自动绑定分组并只修订自己的 write；readAll 仍可读全量。每次 fix 追加独立记录并关联原 write，节点无需提交 logger。

TypeScript

import { AgentCoreEngine, defineWorkflow, route } from '@jangts/agent-core/engine';
type State = { result?: string };
const workflow = defineWorkflow<State, string>({ id: 'prepare', nodes: [{
  id: 'prepare', description: '准备资料', async run(_, context) {
    const subs = context.createSubFlowLogger();
    const read = subs.fork('material-read');
    const id = read.write({ name: '读取资料', kind: 'read', type: 'material.read' });
    read.fix(id, { status: 'running' });
    const result = await Promise.resolve('已准备');
    read.fix(id, { status: 'success', usedModel: false, payload: { result } });
    context.report({ usedModel: false });
    console.log(read.readAll());
    return { result };
  }, routes: [route.deliver('result')],
}] });
const agent = new AgentCoreEngine({ workflow, execution: { observe: {
  accepts: ({ event, content }) => content === 'metadata' || event === 'node.progress',
  event(event) { if (event.type === 'node.progress') console.log(event.payload.subStep, event.subSteps); },
} } });
console.log(await agent.run({}));

JavaScript

import { AgentCoreEngine, defineWorkflow, route } from '@jangts/agent-core/engine';
const workflow = defineWorkflow({ id: 'prepare', nodes: [{
            id: 'prepare', description: '准备资料', async run(_, context) {
                const subs = context.createSubFlowLogger();
                const read = subs.fork('material-read');
                const id = read.write({ name: '读取资料', kind: 'read', type: 'material.read' });
                read.fix(id, { status: 'running' });
                const result = await Promise.resolve('已准备');
                read.fix(id, { status: 'success', usedModel: false, payload: { result } });
                context.report({ usedModel: false });
                console.log(read.readAll());
                return { result };
            }, routes: [route.deliver('result')],
        }] });
const agent = new AgentCoreEngine({ workflow, execution: { observe: {
            accepts: ({ event, content }) => content === 'metadata' || event === 'node.progress',
            event(event) { if (event.type === 'node.progress')
                console.log(event.payload.subStep, event.subSteps); },
        } } });
console.log(await agent.run({}));

自编排执行也使用同一报告上下文

配置 · Node.js

write／fix 会直接发出进度事件，无需为每次修订重复调用 report。默认监听器只接收元数据。

TypeScript

import { AgentCoreEngine } from '@jangts/agent-core/engine';
const agent = new AgentCoreEngine<string>({ execution: { observe: {
  event(event) {
    if (event.type === 'node.progress') console.log(event.payload.subStep);
  },
} } });
const answer = await agent.run(async (_, context) => {
  context.report({ usedModel: false });
  const subs = context.createSubFlowLogger();
  const id = subs.write({ name: '整理结果', kind: 'format', status: 'running' });
  const value = await Promise.resolve('已完成');
  subs.fix(id, { status: 'success', usedModel: false });
  return { type: 'complete', value };
});
console.log(answer);

JavaScript

import { AgentCoreEngine } from '@jangts/agent-core/engine';
const agent = new AgentCoreEngine({ execution: { observe: {
            event(event) {
                if (event.type === 'node.progress')
                    console.log(event.payload.subStep);
            },
        } } });
const answer = await agent.run(async (_, context) => {
    context.report({ usedModel: false });
    const subs = context.createSubFlowLogger();
    const id = subs.write({ name: '整理结果', kind: 'format', status: 'running' });
    const value = await Promise.resolve('已完成');
    subs.fix(id, { status: 'success', usedModel: false });
    return { type: 'complete', value };
});
console.log(answer);

策略与实现

• 共享执行事实源和消费隔离
• 子步骤状态及推进关系