Name: Codex Essentials – AI Assisted Agentic Development Course
Channel: freeCodeCamp.org
Description: Codex Essentials – AI Assisted Agentic Development Course

Codex Essentials – AI Assisted Agentic Development Course

Saved by Janno Nuyles.

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Introduction
Codex Essentials
The AI Certifications Roadmap
Study Recommendations & Passing Requirements
Validity and Re-certification
Accessing the Code Repository Codeex Fundamentals
What is Codeex? Agentic Coding vs. Coding Harness
Common Use Cases and Skills
Understanding the Agentic Loop
OpenAI GPT Model Families
Deep Dive: Model Intelligence vs. Context Windows
Installation Requirements (Node.js & WSL 2)
Authentication: Subscription vs. API Keys
Checking Login Status and Account Info
Lab: Installing Codeex and "Hello World"
Using API Keys for Production and Automation
Setting Environment Variables for Keys
Subscriptions vs. API Token Billing
Managing the Context Window (400k Token Limits)
Truncation and Hallucination Issues
Commands: /clear and /compact
Lab: Managing Context History
Codeex Sessions, Threads, and Messages
Session Commands: /new, /resume, /fork, and /rename
Under the Hood: SQLite and JSONL Session Storage
Tracking Usage with Custom Scripts
Customizing the Status Line
Project Guidance via agents.md
Truncation Limits and Tracing
Lab: Creating Project Guidelines
Deep Dive: Plan Mode and Clarifying Questions
Project Lab: Building a Wolfenstein 3D Clone
Sandbox Security: Bubble Wrap and Seatbelt
Approval Policies (Untrusted, Request, Never)
OS-Specific Settings and Network Access
Permission Overrides: Auto Mode vs. Full Access
Creating and Troubleshooting Rules
Global vs. Project Configuration (config.toml) API, SDKs, and Extensions
Non-Interactive (Headless) Mode for CI/CD
OpenAI Interaction Layers: REST API vs. SDKs
Implementing the OpenAI Agents SDK
Working with the Codeex SDK
Using the Codeex Desktop Application
Installing the VS Code Extension
The Codeex App Server Protocol
Automated Workflows with GitHub Actions
Anatomy of Agent Skills
Discovery, Activation, and Execution
Skill Locations and Marketplace
Lab: Image Generation Skills
Project Lab: Building a Task Manager Skill
Optimizing Cost with Model and Effort Selection
Fast Mode for Inference
Connecting MCP Tools (Roblox Example)
Orchestrating Sub-Agents and Worker Teams

How do you make God laugh?
Dragon flies in
All Heartbeat Photos features - No fluff
Who did you fire? Senator drills Mark Zuckerberg, CEO of Facebook
Heartbeat Payday #2 ❤️
Electric desk in action
All Heartbeat features - No fluff
Use a lifeline - Call my parents
Anytime you say "algorithm" replace it with "audience"
Come on! Hit me! Conan O'Brien punched by Maria Menounos in the abs
Dune: Part 2 - Riding the sandworm
"Do you like to dance?" Aviendha asks
See the color changes
"Fools!" said I "You do not know"
Egwene vs Ishamael - Wheel of Time
Drink a spicy margarita, make some bad decisions
Elvis actor cast as Harkonnen Feyd-Rautha
Everyone shooting at Wonder Woman
Graduation day
Attack Death
Sexy squeeze through a narrow gap
The bureaucracy is expanding to meet the needs of the expanding bureaucracy
End of work from home #funny
And our son?
Step outside the world's tallest building
Great Wall of China - Civ4
10-year anniversary of Freedom!
Almost monetized on YouTube

Skill Locations and Marketplace

Links to other pages

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