客户端: StdioConnector 在失败的握手后重试时,在前驱进程退出之前就可以创建子进程

import assert from "node:assert/strict";
import { Client } from "@modelcontextprotocol/client";
import { StdioClientTransport } from "@modelcontextprotocol/client/stdio";

// Child server that fails initialize
const transport = new StdioClientTransport({
  command: process.execPath,
  args: ["-e", `/* keep open until SIGUSR2 */`],
});

await assert.rejects(client.connect(transport), /initialization failure/);
await client.close();

// Child process is still alive when client.close() resolves:
process.kill(transportPid, 0); // succeeds (ESRCH is not thrown)