Kenhuang Academy
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      • Introduction To Codex

      What Is Codex?

      Codex is OpenAI's coding agent for understanding repositories, planning changes, editing files, running tools, reviewing diffs, and helping teams ship software. It is no longer only "code completion"; it is an agent workflow that can reason, act, observe, and iterate.

      This tutorial uses the Codex Desktop App as the main path, while also covering the CLI, IDE extension, and Cloud.

      From Code Completion To Coding Agent

      Traditional coding assistants mostly complete the current line or answer a question. Codex can work across a repository:

      • inspect files and project conventions
      • use shell commands and development tools
      • edit multiple files
      • run tests or builds
      • explain and review the resulting diff

      Product Matrix: Four Surfaces, One Agent Capability

      1. Codex Desktop App

      The Desktop App is the primary surface in this tutorial. It provides visual project management, local and cloud tasks, diff review, plugins, automations, and computer-use workflows.

      2. Codex CLI

      The CLI is best for terminal-first work, scripting, CI, and users who want direct control from a shell.

      3. IDE Extension

      The IDE extension brings Codex into editors such as VS Code and Cursor, using editor context such as the current file, selection, and diagnostics.

      4. Codex Cloud

      Codex Cloud runs remote tasks, integrates with GitHub-style workflows, and is useful for background issue-to-PR work.

      Five-Layer Customization Stack

      Codex can be customized through:

      1. organization policy
      2. user config
      3. project AGENTS.md
      4. Skills and plugins
      5. the current prompt

      Use stable layers for stable rules, and use the current prompt for task-specific details.

      Good Fit And Caution Areas

      Codex is a good fit for refactoring, tests, documentation, UI iteration, code review, bug fixing, and repository exploration.

      Be careful with production systems, secrets, destructive commands, broad rewrites, and tasks that need legal, medical, or financial certainty.

      Brief Comparison With Other Tools

      Codex overlaps with IDE assistants and terminal coding agents, but its strength is the combination of App, CLI, IDE, Cloud, permissions, plugins, Skills, and team-oriented configuration.

      Billing And Accounts

      Availability depends on your OpenAI account, plan, and enabled surfaces. Check the official docs for current account and billing details.

      Next Steps

      Continue with Core Concepts.

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