Vercel Sandbox 命令現已支援 stdin

Vercel Sandbox now lets you send input to running commands through standard input (stdin). Use it to exchange messages with stdio MCP servers such as agent-browser, or send data to other command-line programs while they run.

In the TypeScript SDK, set stdin: true and detached: true in runCommand(). Use writeStdin() to send input and closeStdin() when you’re done:

import { Sandbox } from '@vercel/sandbox';
const sandbox = await Sandbox.create();
const cmd = await sandbox.runCommand({
  cmd: 'cat',
  stdin: true,
  detached: true,
});
await cmd.writeStdin('hello');
await cmd.closeStdin();
const result = await cmd.wait();
console.log(await result.stdout()); // "hello"

Send input to a running command and read its output with the Sandbox TypeScript SDK.

You can also set stdin to a Node.js readable stream, such as process.stdin. The SDK forwards the stream’s data and closes the command’s standard input when the stream ends.

In the Python SDK, set stdin=subprocess.PIPE and send input with server.stdin.send(). Call communicate() to close stdin, collect remaining output, and wait for the process to exit:

import subprocess
from vercel import sandbox
from vercel.api import session
async with session():
    async with sandbox.create_sandbox() as instance:
        server = await instance.create_process("cat", stdin=subprocess.PIPE)
        await server.stdin.send(b"ping\n")
        print(await server.stdout.readline())
        print(await server.communicate())

Write to a running process’s stdin and read its output with the Sandbox Python SDK.

For commands that receive all their input at once, you can pass input directly to Python’s run_process().

Read the Sandbox documentation to get started.