Vercel Sandbox Adds Standard Input Support
Vercel Sandbox now allows sending input to running commands through standard input.
What happened
Vercel has updated its Sandbox environment to include support for standard input (stdin) in running commands. This allows developers to send input to commands as they execute.
The change enables communication with stdio MCP servers like agent-browser, enhancing the interaction between the Sandbox and external processes.
Why it matters
This update is particularly useful for developers working with command-line tools and stdio MCP servers, as it provides a more dynamic way to interact with running processes.
Key details
In the TypeScript SDK, developers must set stdin: true and detached: true when using the runCommand() function to enable stdin support.
The writeStdin() method is used to send input, and closeStdin() is called once the process is complete. For Python, stdin is set to subprocess.PIPE, and input is sent using server.stdin.send().
Sources
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