Vercel Sandbox commands now support stdin
Vercel Sandbox commands can now receive input through standard input (stdin). The TypeScript SDK adds stdin and detached options to runCommand(), with writeStdin() to send input and closeStdin() to end it; the Python SDK uses stdin=subprocess.PIPE with server.stdin.send() and communicate().
Why it matters
Builders can now exchange messages with stdio MCP servers and pipe data into command-line programs while they run inside a Sandbox, rather than supplying all input up front.
Who should care
Developers building AI agents, MCP server integrations, or automation that runs command-line tools in Vercel Sandbox.
What you can do
In the TypeScript SDK, call runCommand() with stdin: true and detached: true, then use writeStdin() to send input and closeStdin() when finished.