Getting started with Codex

Get started with Codex, OpenAI’s coding agent, in this step-by-step onboarding walkthrough. You’ll learn how to install Codex, set up the CLI and VS Code extension, configure your workflow, and use Agents.md and prompting patterns to write, review, and reason across a real codebase.

This video covers:

00:00 | Installing Codex (CLI + IDE)
04:00 | Setting up a repo and getting your first runs working
08:12 | Writing a great Agents.md (patterns + best practices)
14:14 | Configuring Codex for your environment
16:26 | Prompting patterns for more consistent results
27:02 | Tips for using Codex in the CLI and IDE
34:59 | MCP Configuration
46:50 | Advanced workflows: headless mode + SDK
52:02 | Codex resources to get you started

Sign up: https://openai.com/codex/
Codex overview + docs: https://developers.openai.com/codex
Codex Cookbook: https://cookbook.openai.com/topic/codex

Install + setup

VS Code extension: https://marketplace.visualstudio.com/items?itemName=openai.chatgpt
Agents.md standard: https://agents.md
Agents.md repo: https://github.com/agentsmd/agents.md

Prompting + workflows
Prompting guide: https://developers.openai.com/codex/prompting/

Exec plans (Agents.md patterns): https://cookbook.openai.com/articles/codex_exec_plans

Config reference: https://github.com/openai/codex/blob/main/docs/config.md#config-reference

Updates
Changelog: https://developers.openai.com/codex/changelog
Releases: https://github.com/openai/codex/releases