Update Codex CLI installation guide

Author: madeline-underwood

content/install-guides/codex-cli.md

@@ -16,9 +16,11 @@ tool_install: true
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-Codex CLI is a lightweight coding agent from OpenAI that runs locally in your terminal. It can help you with coding tasks, understand your codebase, run commands, and assist with development workflows.
+Codex CLI is a local, terminal-based coding agent from OpenAI that helps developers explore codebases, generate changes, and run commands using natural language.
 
-It supports multiple operating systems, including Arm-based Linux distributions and macOS.
+It’s useful for tasks such as understanding unfamiliar projects, refactoring code, and accelerating development workflows directly from the command line.
+
+It supports multiple operating systems, including Arm-based Linux distributions and macOS. By integrating AI assistance directly into command-line workflows, it reduces context switching during development.
 
 This guide explains how to install Codex CLI on macOS and Arm Linux.
 
@@ -68,6 +70,8 @@ If you're not using Ubuntu/Debian, use your package manager to install curl.
 
 ### How do I install Node.js on Arm Linux?
 
+{{% notice Note %}}If you already have Node.js 18 or later installed, you can skip this section.{{% /notice %}}
+
 Codex CLI requires Node.js version 18 or higher. The easiest way to install Node.js on Arm Linux is using the NodeSource repository.
 
 Download and run the Node.js setup script. For example, for Node.js 22.x: