Install Better Call Claude in mcp-client-cli

What you need first

mcp-client-cli, installed.
Node.js, which gives the npx command the server starts with.
Your own values for YOUR_BETTERCALLCLAUDE_PHONE_PROVIDER,YOUR_BETTERCALLCLAUDE_PHONE_NUMBER,YOUR_BETTERCALLCLAUDE_PHONE_ACCOUNT_SID,YOUR_BETTERCALLCLAUDE_PHONE_AUTH_TOKEN,YOUR_BETTERCALLCLAUDE_USER_PHONE_NUMBER,YOUR_BETTERCALLCLAUDE_OPENAI_API_KEY.

Steps

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

{
  "mcpServers": {
    "better-call-claude": {
      "command": "npx",
      "args": ["-y", "[email protected]"],
      "env": { "BETTERCALLCLAUDE_PHONE_PROVIDER": "YOUR_BETTERCALLCLAUDE_PHONE_PROVIDER", "BETTERCALLCLAUDE_PHONE_NUMBER": "YOUR_BETTERCALLCLAUDE_PHONE_NUMBER", "BETTERCALLCLAUDE_PHONE_ACCOUNT_SID": "YOUR_BETTERCALLCLAUDE_PHONE_ACCOUNT_SID", "BETTERCALLCLAUDE_PHONE_AUTH_TOKEN": "YOUR_BETTERCALLCLAUDE_PHONE_AUTH_TOKEN", "BETTERCALLCLAUDE_USER_PHONE_NUMBER": "YOUR_BETTERCALLCLAUDE_USER_PHONE_NUMBER", "BETTERCALLCLAUDE_OPENAI_API_KEY": "YOUR_BETTERCALLCLAUDE_OPENAI_API_KEY" }
    }
  }
}

Replace YOUR_BETTERCALLCLAUDE_PHONE_PROVIDER,YOUR_BETTERCALLCLAUDE_PHONE_NUMBER,YOUR_BETTERCALLCLAUDE_PHONE_ACCOUNT_SID,YOUR_BETTERCALLCLAUDE_PHONE_AUTH_TOKEN,YOUR_BETTERCALLCLAUDE_USER_PHONE_NUMBER,YOUR_BETTERCALLCLAUDE_OPENAI_API_KEY with your own values.
Save the file and restart mcp-client-cli.

Check it worked

Ask mcp-client-cli: List the tools of better-call-claude.

If it does not start

spawn npx ENOENT: Node.js is not on the PATH that mcp-client-cli sees. Install it, or write the full path of npx in the config.
The server starts, but its tools fail: A YOUR_… placeholder is still in the config, or its value is wrong.
Nothing changes after a restart: The file is not valid JSON any more. Look for a missing comma where the block was added.

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