MCP Servers

Board Terminal Skill

MCP server for running shell commands on a Linux development board via UART serial.

README

Board Terminal Skill

MCP server exposing one tool, board_terminal, for running shell commands on a Linux development board through a controlled executor.

The first backend is UART serial. SSH is represented by a placeholder interface so it can be added without changing the MCP tool contract.

Tool

Input:

{
  "command": "cat /proc/cpuinfo"
}

Output:

{
  "success": true,
  "stdout": "processor : 0\n...",
  "stderr": "",
  "exit_code": 0,
  "elapsed_ms": 135
}

For serial shells there is no reliable process exit status unless the command wrapper reports it. This implementation wraps every command and captures a marker containing $?, so exit_code is the command exit code when the shell supports standard POSIX syntax. If the marker cannot be parsed but the prompt returns, exit_code defaults to 0.

Configuration

Environment variables:

Variable	Default	Description
`BOARD_BACKEND`	`serial`	Backend name. Currently only `serial` is implemented.
`BOARD_SERIAL_PORT`	`COM3`	Serial device path, for example `COM3` or `/dev/ttyUSB0`.
`BOARD_SERIAL_BAUDRATE`	`115200`	UART baud rate.
`BOARD_SERIAL_TIMEOUT`	`0.2`	Per-read timeout in seconds.
`BOARD_COMMAND_TIMEOUT`	`15.0`	Command completion timeout in seconds.
`BOARD_PROMPT`	`<<<PROMPT>>>`	Stable shell prompt used to detect completion.
`BOARD_ENCODING`	`utf-8`	Serial text encoding.

Run

Install dependencies:

python3 -m pip install -e .

Start the MCP server over stdio:

board-terminal-skill

Example MCP client configuration:

{
  "mcpServers": {
    "board-terminal": {
      "command": "board-terminal-skill",
      "env": {
        "BOARD_SERIAL_PORT": "/dev/ttyUSB0",
        "BOARD_SERIAL_BAUDRATE": "115200"
      }
    }
  }
}

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