OpenAI Codex Essentials – AI Coding Agent

Learn how to use Codex to accelerate real-world coding workflows and developer productivity. Created by @ExamProChannel Course info: https://www.exampro.co/exp-codex-01 ❤️ Support for this channel comes from our friends at Scrimba – the coding platform that's reinvented interactive learning: https://scrimba.com/freecodecamp ⭐️ Contents ⭐️ - 00:00 Introduction - 01:33 Codex Essentials - 03:02 The AI Certification Roadmap - 06:51 Study Recommendations & Passing Requirements - 09:23 Validity and Re-certification - 11:26 Accessing the Code Repository Codeex Fundamentals - 12:10 What is Codeex? Agentic Coding vs. Coding Harness - 13:39 Common Use Cases and Skills - 14:21 Understanding the Agentic Loop - 15:40 OpenAI GPT Model Families - 17:27 Deep Dive: Model Intelligence vs. Context Windows - 21:52 Installation Requirements (Node.js & WSL 2) - 23:00 Authentication: Subscription vs. API Keys - 23:32 Checking Login Status and Account Info - 24:33 Lab: Installing Codeex and "Hello World" - 29:32 Using API Keys for Production and Automation - 32:26 Setting Environment Variables for Keys - 36:00 Subscriptions vs. API Token Billing - 38:08 Managing the Context Window (400k Token Limits) - 40:06 Truncation and Hallucination Issues - 40:36 Commands: /clear and /compact - 41:17 Lab: Managing Context History - 50:27 Codeex Sessions, Threads, and Messages - 51:25 Session Commands: /new, /resume, /fork, and /rename - 52:48 Under the Hood: SQLite and JSONL Session Storage - 1:01:01 Tracking Usage with Custom Scripts - 1:13:53 Customizing the Status Line - 1:22:05 Project Guidance via agents.md - 1:23:09 Truncation Limits and Tracing - 1:24:39 Lab: Creating Project Guidelines - 1:41:08 Deep Dive: Plan Mode and Clarifying Questions - 1:42:10 Project Lab: Building a Wolfenstein 3D Clone - 1:53:00 Sandbox Security: Bubble Wrap and Seatbelt - 1:53:56 Approval Policies (Untrusted, Request, Never) - 1:54:50 OS-Specific Settings and Network Access - 2:04: