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/**
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* pi-coop extension：让 pi 适配 blackboard 协作协议。
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*
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* 做两件事：
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* 1. 注册 "coop" provider —— 从环境变量 BASE_URL / API_KEY / PROTOCOL / MODEL
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* 构造一个 OpenAI 兼容或 Anthropic 兼容的 provider，使 supervisor 注入的
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* 模型配置（与 pigo-coop 完全相同的环境变量）能直接被 pi 使用。
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* 2. 注册 "blackboard" 工具 —— 复刻 pigo 的 blackboard 工具（read / post / done），
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* 让 agent 通过 action=done 原子创建 /blackboard/DONE 标记，supervisor 据此判定
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* 任务完成。AGENTS.md 协议因此无需改动。
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*
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* 与 pigo blackboard_tool.go 行为对齐：post 用 O_APPEND 单次写（原子），
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* done 用 O_CREAT|O_EXCL（'wx'，保证唯一创建），路径全部做 traversal 校验。
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*/
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import { Type } from "@earendil-works/pi-ai";
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import { defineTool, type ExtensionAPI } from "@earendil-works/pi-coding-agent";
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import { openSync, closeSync, writeFileSync, appendFileSync, readFileSync, readdirSync, statSync, mkdirSync, existsSync } from "node:fs";
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import { join, resolve, sep, isAbsolute, clean, basename } from "node:path";
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// 单条 post / 单文件 read 上限：放开到 128KB，复杂任务的脚本与日志能整段读写。
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const MAX_POST_BYTES = 128 * 1024;
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const MAX_READ_BYTES = 128 * 1024;
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// provider 协议 → pi api 类型映射。PROTOCOL 由 supervisor 从外部注入
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// （取值 openai | anthropic，见 agent api_config.go Provider()）。
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function protocolToApi(protocol: string): "openai-completions" | "anthropic-messages" {
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return protocol === "anthropic" ? "anthropic-messages" : "openai-completions";
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}
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export default function (pi: ExtensionAPI) {
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const baseUrl = process.env.BASE_URL ?? "";
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const apiKey = process.env.API_KEY ?? "";
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const protocol = process.env.PROTOCOL ?? "openai";
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const modelId = process.env.MODEL ?? "";
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const bbRoot = process.env.BB ?? "/blackboard";
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if (!baseUrl || !apiKey || !modelId) {
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// supervisor 已在前置校验里保证这三个变量非空，这里只做兜底：
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// 若 provider 注册失败，pi 启动时会报 model 无法解析，比这里静默更好。
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throw new Error(`coop extension: BASE_URL / API_KEY / MODEL 环境变量必须同时提供`);
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}
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// 注册 coop provider。models 数组在工厂里动态构造（id 取自 MODEL），
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// 这样 --provider coop --model "$MODEL" 即可命中。
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pi.registerProvider("coop", {
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baseUrl,
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apiKey,
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api: protocolToApi(protocol),
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models: [
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{
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id: modelId,
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name: modelId,
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reasoning: true,
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input: ["text", "image"],
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cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
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// 完全放开上下文与输出限制，让复杂任务能充分展开思考与多轮工具调用。
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contextWindow: 128000,
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maxTokens: 65536,
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},
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],
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});
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// ---- blackboard 工具 ----
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const blackboardTool = defineTool({
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name: "blackboard",
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label: "Blackboard",
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description:
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"Read and write the task blackboard used by the coop runner. This is the ONLY tool that may touch shared blackboard files atomically. " +
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"Actions: read (no path: global snapshot of task.md, workspace listing, DONE state; with path like \"workspace/exploit.py\": contents of that one file); " +
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"post (atomically append a progress note; file must be a bare .md name under messages/, e.g. \"round-1-a.md\"); " +
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"done (atomically create the DONE marker with a final delivery summary, only when the deliverable is truly complete; fails if DONE already exists). " +
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"The blackboard root, current round and your name are available in the environment as BB, ROUND, NAME.",
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parameters: Type.Object({
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action: Type.String({ description: "read | post | done" }),
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path: Type.Optional(Type.String({ description: 'For read: a path under the blackboard root to fetch (e.g. messages/round-1-a.md). Omit for the global snapshot.' })),
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file: Type.Optional(Type.String({ description: 'For post: bare file name under messages/, must end in .md (e.g. round-1-a.md).' })),
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content: Type.Optional(Type.String({ description: "For post: the message body (max 128 KiB)." })),
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summary: Type.Optional(Type.String({ description: "For done: final delivery summary written into DONE." })),
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}),
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async execute(_toolCallId, params) {
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const action = String(params.action ?? "");
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try {
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switch (action) {
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case "read":
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return read(params.path);
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case "post":
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return post(params.file, params.content);
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case "done":
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return done(params.summary);
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default:
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return err(`blackboard: unknown action "${action}" (want read|post|done)`);
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}
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} catch (e) {
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return err(`blackboard ${action}: ${e instanceof Error ? e.message : String(e)}`);
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}
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},
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});
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pi.registerTool(blackboardTool);
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// ---- 实现部分 ----
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// safePath：把相对路径解析到 blackboard 根内，拒绝绝对路径与 .. 越界。
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// 与 pigo blackboard_tool.go safePath 行为一致。
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function safePath(p: string): string {
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const trimmed = (p ?? "").trim();
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if (trimmed === "") throw new Error("empty path");
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const c = clean(trimmed);
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if (isAbsolute(c)) throw new Error(`path "${p}" must be relative to the blackboard root`);
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const rootClean = clean(bbRoot);
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const full = join(rootClean, c);
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if (full !== rootClean && !full.startsWith(rootClean + sep)) {
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throw new Error(`path "${p}" escapes the blackboard root`);
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}
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return full;
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}
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function ok(text: string) {
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return { content: [{ type: "text" as const, text }] };
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}
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function err(text: string) {
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return { content: [{ type: "text" as const, text }], isError: true };
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}
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function truncate(s: string, max: number): string {
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return s.length > max ? s.slice(0, max) + "\n...<truncated>" : s;
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}
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// read：无 path → 全局快照（task.md / messages 列表 / workspace 列表 / DONE 状态）；
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// 有 path → 单文件内容。
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function read(pathParam: unknown) {
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const p = pathParam != null ? String(pathParam) : "";
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if (p.trim() !== "") {
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return readFile(p);
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}
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const b: string[] = [];
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// task.md
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try {
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const data = readFileSync(join(bbRoot, "task.md"), "utf8");
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b.push("# task.md\n" + truncate(data, MAX_READ_BYTES) + "\n");
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} catch {
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b.push("# task.md\n<missing>\n");
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}
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// messages/
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b.push("\n# messages/ (" + listNames("messages").join(", ") + ")\n");
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for (const name of listListing("messages")) b.push(" - " + name + "\n");
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// workspace/
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b.push("\n# workspace/ (your workspace)\n");
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for (const name of listListing("workspace")) b.push(" - " + name + "\n");
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// DONE
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let doneText = "";
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try {
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doneText = truncate(readFileSync(join(bbRoot, "DONE"), "utf8"), MAX_READ_BYTES);
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} catch {}
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b.push("\n# DONE\n");
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b.push(doneText ? "EXISTS:\n" + doneText + "\n" : "<not created yet — cooperation is still in progress>\n");
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// environment
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const env: string[] = [];
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for (const k of ["BB", "ROUND", "NAME"]) {
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const v = (process.env[k] ?? "").trim();
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if (v) env.push(` ${k}=${v}`);
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}
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if (env.length) b.push("\n# environment\n" + env.join("\n") + "\n");
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return ok(b.join(""));
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}
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function readFile(p: string) {
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const full = safePath(p);
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let info;
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try {
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info = statSync(full);
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} catch (e) {
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return err(`blackboard read: ${p}: ${e instanceof Error ? e.message : String(e)}`);
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}
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if (info.isDirectory()) return err(`blackboard read: ${p} is a directory; only files can be read`);
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const data = readFileSync(full, "utf8");
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return ok("# " + p + "\n" + truncate(data, MAX_READ_BYTES));
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}
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// post：原子追加一条消息到 messages/<file>。file 必须是裸 *.md 名。
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function post(fileParam: unknown, contentParam: unknown) {
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const name = String(fileParam ?? "").trim();
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if (!validMessageName(name)) {
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return err('blackboard post: file must be a bare name ending in .md (e.g. "round-1-a.md"), no path separators, no ".."');
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}
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const content = String(contentParam ?? "").trim();
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if (content === "") return err("blackboard post: content must not be empty");
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if (Buffer.byteLength(content) > MAX_POST_BYTES) {
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return err(`blackboard post: content too large (${Buffer.byteLength(content)} bytes, max ${MAX_POST_BYTES})`);
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}
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const dir = join(bbRoot, "messages");
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mkdirSync(dir, { recursive: true });
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// O_APPEND 单次写：POSIX 下并发 post 不会交错字节。
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appendFileSync(join(dir, name), content + "\n");
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return ok(`Message appended to messages/${name}`);
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}
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// done：原子创建 DONE 标记。'wx' = O_CREAT|O_EXCL|O_WRONLY，保证唯一创建。
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function done(summaryParam: unknown) {
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const summary = String(summaryParam ?? "").trim();
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if (summary === "") return err("blackboard done: summary must not be empty (include the final delivery summary)");
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const header = "Blackboard cooperation DONE\ncreated: " + new Date().toISOString() + "\n\n";
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const target = join(bbRoot, "DONE");
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let fd: number;
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try {
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fd = openSync(target, "wx");
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} catch (e) {
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if (existsSync(target)) {
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const existing = readFileSync(target, "utf8");
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return err("blackboard done: DONE already exists — cooperation already finished:\n" + truncate(existing, MAX_READ_BYTES));
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}
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return err("blackboard done: " + (e instanceof Error ? e.message : String(e)));
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}
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try {
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writeFileSync(fd, header + summary);
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} finally {
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closeSync(fd);
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}
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return ok("DONE marker created. Cooperation finished.");
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}
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// 校验 post 文件名：裸 *.md，无分隔符，无 . / ..
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function validMessageName(name: string): boolean {
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if (name === "" || !name.endsWith(".md")) return false;
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if (/[\\/]/.test(name) || name === "." || name === "..") return false;
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const base = name.slice(0, -3);
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if (base === "" || base.startsWith(".") || base.includes("..")) return false;
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return true;
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}
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function listNames(sub: string): string[] {
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try {
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return readdirSync(join(bbRoot, sub)).sort();
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} catch {
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return [];
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}
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}
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function listListing(sub: string): string[] {
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try {
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return readdirSync(join(bbRoot, sub))
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.sort()
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.map((name) => {
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try {
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const info = statSync(join(bbRoot, sub, name));
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if (info.isDirectory()) return `${name} (dir)`;
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return `${name} (${info.size} bytes, ${info.mtime.toISOString().slice(11, 19)})`;
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} catch {
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return name;
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}
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});
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} catch {
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return [];
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}
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}
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}
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