Install AppScreen in TUUI

What you need first

• TUUI, installed.
• Node.js, which gives the npx command the server starts with.

Steps

1. Open ~/.codex/config.toml, or create it. The Codex CLI, its IDE extension and the ChatGPT desktop app share this file.
2. Add this table at the end of the file.

{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": ["-y", "@appscreen/[email protected]"]
    }
  }
}

3. Save the file and restart TUUI.

Check it worked

Ask TUUI: List the tools of mcp.

If it does not start

spawn npx ENOENT

Node.js is not on the PATH that TUUI sees. Install it, or write the full path of npx in the config.

Nothing changes after a restart

The file is not valid JSON any more. Look for a missing comma where the block was added.