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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
– 2:04:49 Permission Overrides: Auto Mode vs. Full Access
– 2:07:01 Creating and Troubleshooting Rules
– 2:32:50 Global vs. Project Configuration (config.toml) API, SDKs, and Extensions
– 2:36:19 Non-Interactive (Headless) Mode for CI/CD
– 2:43:35 OpenAI Interaction Layers: REST API vs. SDKs
– 2:50:04 Implementing the OpenAI Agents SDK
– 3:01:13 Working with the Codeex SDK
– 3:05:16 Using the Codeex Desktop Application
– 3:09:29 Installing the VS Code Extension
– 3:10:58 The Codeex App Server Protocol
– 3:12:24 Automated Workflows with GitHub Actions
– 3:18:07 Anatomy of Agent Skills
– 3:21:20 Discovery, Activation, and Execution
– 3:22:26 Skill Locations and Marketplace
– 3:23:01 Lab: Image Generation Skills
– 3:35:03 Project Lab: Building a Task Manager Skill
– 3:47:08 Optimizing Cost with Model and Effort Selection
– 3:48:14 Fast Mode for Inference
– 3:57:18 Connecting MCP Tools (Roblox Example)
– 4:10:21 Orchestrating Sub-Agents and Worker Teams
🎉 Thanks to our Champion and Sponsor supporters:
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