mirror of
https://github.com/shareAI-lab/analysis_claude_code.git
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refactor: organize agent harness courses
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Haoran
306
learn-pi-agent/s04_evented_tool_loop/code.ts
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306
learn-pi-agent/s04_evented_tool_loop/code.ts
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// s04: Evented Tool Loop — mini Pi 的第 4 版
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//
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// [U1 升级] runOneTurn → runEventedToolLoop：provider 请求工具，core 执行后把结果送回，循环到 provider 不再请求为止。
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// 词汇边界：本章新增 ToolCall / ToolResultMessage / tool_call / toolUse / runEventedToolLoop / run。
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// 关键：tools 取 registry.getSpecs()（单一数据源，不硬编码）；循环有上限（R5）；工具出错不崩（R4）。
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declare const process: {
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exitCode?: number;
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};
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// —— 停止原因（R1：s04 加 toolUse）——
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export type StopReason = "stop" | "toolUse" | "error";
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// —— s01 起：消息 ——
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export type UserMessage = {
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role: "user";
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content: string;
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};
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export type AssistantMessage = {
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role: "assistant";
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content: string;
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stopReason: StopReason;
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};
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// s04 新增：工具执行结果也是一种消息，和 user / assistant 平级。
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export type ToolResultMessage = {
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role: "toolResult";
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toolCallId: string;
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content: string;
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};
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// s04 起：AgentMessage 并入 ToolResultMessage（R1 只增）
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export type AgentMessage = UserMessage | AssistantMessage | ToolResultMessage;
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// —— s01 起：core 内部状态 ——
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export type AgentState = {
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messages: AgentMessage[];
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};
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// —— s02 起：工具契约 ——
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export type ToolSpec = {
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name: string;
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description: string;
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input: Record<string, string>;
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};
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export type ToolHandler = (input: Record<string, string>) => string;
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// s04 新增：provider 对一个工具的调用请求。
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export type ToolCall = {
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id: string;
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name: string;
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input: Record<string, string>;
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};
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export type Tool = {
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spec: ToolSpec;
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handler: ToolHandler;
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};
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export class ToolRegistry {
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private tools = new Map<string, Tool>();
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register(tool: Tool): void {
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this.tools.set(tool.spec.name, tool);
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}
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getSpecs(): ToolSpec[] {
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return [...this.tools.values()].map((tool) => tool.spec);
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}
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// s04 新增：执行工具。未知工具不崩，返回一句说明。
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run(call: ToolCall): string {
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const tool = this.tools.get(call.name);
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if (!tool) {
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return `unknown tool: ${call.name}`;
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}
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return tool.handler(call.input);
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}
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}
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// —— provider 对外消息（s04：加 toolResult 形态）——
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export type ProviderMessage =
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| { role: "user" | "assistant"; content: string }
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| { role: "toolResult"; toolCallId: string; content: string };
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// provider 输入（R1 只增）
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export type ProviderInput = {
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messages: ProviderMessage[];
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tools: ToolSpec[];
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};
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// —— s03 起：事件流（s04 加 tool_call，保留 message_start，R1）——
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export type ProviderEvent =
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| { type: "message_start" }
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| { type: "text_delta"; text: string }
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| { type: "tool_call"; call: ToolCall }
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| { type: "message_end"; stopReason: StopReason };
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export interface Provider {
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stream(input: ProviderInput): AsyncGenerator<ProviderEvent>;
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}
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// —— s01 起：输出抽象（R7）——
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export type Output = {
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log(line: string): void;
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};
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export function createConsoleOutput(): Output {
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return { log: (line) => console.log(line) };
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}
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// ============ 构造函数 ============
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export function createInitialState(): AgentState {
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return { messages: [] };
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}
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export function createUserMessage(content: string): UserMessage {
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return { role: "user", content };
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}
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// s04：buildProviderInput 要把 toolResult 消息也正确转给 provider。
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export function buildProviderInput(
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state: AgentState,
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registry: ToolRegistry,
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): ProviderInput {
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return {
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messages: state.messages.map((message) => {
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if (message.role === "toolResult") {
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return {
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role: "toolResult",
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toolCallId: message.toolCallId,
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content: message.content,
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};
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}
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return { role: message.role, content: message.content };
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}),
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tools: registry.getSpecs(),
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};
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}
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// ============ s04 [U1]：工具循环（取代 runOneTurn）============
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// s03 的 collectAssistantMessage（只攒文本事件）被这里的循环内联收集取代——
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// 循环要处理 tool_call，所以收集逻辑直接长在循环里。
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// R5：循环必须有上限。否则一个一直请求工具的 provider 会让 core 死循环。
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const MAX_TURNS = 8;
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export async function runEventedToolLoop(
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state: AgentState,
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provider: Provider,
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registry: ToolRegistry,
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userInput: string,
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output: Output,
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): Promise<AssistantMessage> {
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state.messages.push(createUserMessage(userInput));
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let turns = 0;
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while (true) {
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turns += 1;
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if (turns > MAX_TURNS) {
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output.log(`(达到最大轮次 ${MAX_TURNS}，停止)`);
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const stopped: AssistantMessage = {
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role: "assistant",
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content: "(达到最大轮次，停止)",
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stopReason: "stop",
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};
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state.messages.push(stopped);
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return stopped;
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}
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const providerInput = buildProviderInput(state, registry);
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let content = "";
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let stopReason: StopReason = "stop";
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let sawToolCall = false;
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for await (const event of provider.stream(providerInput)) {
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if (event.type === "message_start") {
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output.log("message_start");
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} else if (event.type === "text_delta") {
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output.log(`text_delta: ${event.text}`);
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content += event.text;
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} else if (event.type === "tool_call") {
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sawToolCall = true;
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output.log(`tool_call: ${event.call.name}`);
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// R4：工具执行抛错也不崩，错误变成一条结果消息送回去。
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let result: string;
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try {
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result = registry.run(event.call);
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} catch (error) {
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result = `error: ${error instanceof Error ? error.message : String(error)}`;
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}
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const resultMessage: ToolResultMessage = {
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role: "toolResult",
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toolCallId: event.call.id,
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content: result,
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};
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state.messages.push(resultMessage);
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output.log(`tool_result: ${result}`);
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} else if (event.type === "message_end") {
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stopReason = event.stopReason;
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output.log(`message_end: ${stopReason}`);
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}
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}
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// 没有 tool_call，或 provider 明确不再用工具（stopReason 不是 toolUse），就结束。
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if (!sawToolCall || stopReason !== "toolUse") {
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const assistant: AssistantMessage = { role: "assistant", content, stopReason };
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state.messages.push(assistant);
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return assistant;
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}
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}
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}
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// ============ Demo Provider（fake）============
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// 演示一个完整的工具循环：第一轮请求工具，第二轮收到结果后输出文本并结束。
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export class DemoProvider implements Provider {
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public lastInput: ProviderInput | undefined;
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async *stream(input: ProviderInput): AsyncGenerator<ProviderEvent> {
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this.lastInput = input;
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const last = input.messages[input.messages.length - 1];
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yield { type: "message_start" };
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if (last?.role === "toolResult") {
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// 工具结果回来了：输出文本，正常结束。
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yield { type: "text_delta", text: `工具结果是：${last.content}` };
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yield { type: "message_end", stopReason: "stop" };
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return;
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}
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// 否则请求调用一个工具。
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yield {
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type: "tool_call",
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call: { id: "call_1", name: "current_time", input: {} },
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};
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yield { type: "message_end", stopReason: "toolUse" };
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}
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}
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// ============ 演示脚手架 ============
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function createRegistry(): ToolRegistry {
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const registry = new ToolRegistry();
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registry.register({
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spec: {
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name: "current_time",
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description: "返回一个固定的演示时间",
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input: {},
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},
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handler: () => "2026-01-01T00:00:00Z",
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});
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return registry;
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}
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function printAssistantMessage(output: Output, message: AssistantMessage): void {
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output.log("[assistant]");
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output.log(`content: ${message.content}`);
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output.log(`stopReason: ${message.stopReason}`);
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output.log("");
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}
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function printState(output: Output, state: AgentState): void {
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output.log("[state]");
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output.log(state.messages.map((message) => message.role).join(" -> "));
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output.log("");
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}
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async function main(): Promise<void> {
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const output = createConsoleOutput();
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const state = createInitialState();
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const registry = createRegistry();
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const provider = new DemoProvider();
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output.log("s04: Evented Tool Loop");
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output.log("");
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output.log("[user]");
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output.log("现在几点？");
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output.log("");
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const assistant = await runEventedToolLoop(
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state,
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provider,
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registry,
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"现在几点？",
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output,
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);
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output.log("");
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printAssistantMessage(output, assistant);
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printState(output, state);
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}
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main().catch((error: unknown) => {
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console.error(error);
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process.exitCode = 1;
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});
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