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Write to command stdin
An MCP tool from the Vercel API server, hosted on mcp.hjlabs.in.
Write to command stdin Writes data to the stdin of a running command, and optionally closes it. The command must have been started with attachStdin set to true. Writes are applied in the order they are received. Send them… [POST /v2/sandboxes/sessions/{sessionId}/cmd/{cmdId}/stdin]
Name on the gateway: vercel_api__write_session_command_stdin · may change things.
Parameters
| Name | Type | Description |
|---|---|---|
sessionId required | string | The unique identifier of the session containing the command. |
cmdId required | string | The unique identifier of the command to write to. |
teamId | string | The Team identifier to perform the request on behalf of. |
slug | string | The Team slug to perform the request on behalf of. |
data | string | Base64-encoded bytes to write to the command stdin. The request body is… |
offset | integer | The position in the command stdin where data starts. Bytes before the total… |
close | boolean | If true, closes the command stdin after writing data. Use this for commands… |
How to call it
Through the Smart Gateway, any client can run it by name with call_tool, or let the gateway find it with search_tools:
{
"name": "vercel_api__write_session_command_stdin",
"arguments": {
"sessionId": "…",
"cmdId": "…"
}
}Or connect the Vercel API server directly, which lists 472 tools including this one:
claude mcp add --transport http hj-vercel-api https://mcp.hjlabs.in/mcp/vercel-api \
--header "Authorization: Bearer YOUR_API_KEY"Try asking
Use the write to command stdin tool with sessionId set to ….