PlatformIO MCP Server

What the code does

We read the source, 2 d ago · rules 995398eba69f

A value the model can set ends up inside a file or shell call. That is not a flaw by itself — for a terminal server it is the job — but it is where things go wrong when it is not.

        return subprocess.run(cmd, capture_output=True, timeout=timeout_s + 3).returncode == 0

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

        subprocess.run(cmd, check=False)

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

claude mcp add platformio-mcp -- uvx platformio.mcp

{
  "mcpServers": {
    "platformio-mcp": {
      "command": "uvx",
      "args": [
        "platformio.mcp"
      ]
    }
  }
}

[mcp_servers.platformio-mcp]
command = "uvx"
args = ["platformio.mcp"]

{
  "mcpServers": {
    "platformio-mcp": {
      "command": "uvx",
      "args": [
        "platformio.mcp"
      ]
    }
  }
}

{
  "servers": {
    "platformio-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "platformio.mcp"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: PLATFORMIO_MCP_POLICY (full (default), build_only, or read_only), PLATFORMIO_MCP_PROJECT_DIR (Default project directory when a tool is called without project_dir), PLATFORMIO_MCP_PIO (Explicit path to the pio executable (auto-detected otherwise)).