Codex 101
Author: Seowoo Han
A bilingual 101 tutorial that helps developers learn Codex across CLI, desktop, IDE, and web workflows.
Description
Codex 101 began in February 2026 as a fact-based Korean developer resource and grew into a bilingual Korean and English tutorial site for developers who want a practical introduction to Codex. It brings setup, authentication, approval modes, slash commands, AGENTS.md, config, MCP, automation patterns, and workflow guidance into one structured guide.
Build notes
Initial prompt
Using the content from `https://github.com/openai/skills`, `https://developers.openai.com/codex/skills`, `https://developers.openai.com/codex/skills#create-a-skill`, and `https://agentskills.io/home`, I want to create a GitHub Pages-style site that Korean developers can easily learn from, follow, and understand. I’d also like it to surface examples and practical tips that may not be obvious from the OpenAI site alone, while staying grounded in facts.
Iterations
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Collected source material from OpenAI's skills documentation, the Codex skills guide, the GitHub skills repository, and community Agent Skills examples.
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Shaped the first Korean developer guide around Codex setup, workflows, practical examples, and fact-checked guidance.
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Expanded the project into Codex 101, a bilingual guide covering CLI, desktop, IDE, web, configuration, MCP, automations, and common workflows.
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Added a recurring Codex maintenance loop with the OpenAI Docs MCP to review Codex model pages, docs, announcements, quickstart, pricing, best practices, config, Windows, and IDE updates.
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Refined the automation prompt and manually filled gaps whenever Codex missed details in the daily refresh.
- Final step
Used Computer Use to review and improve the UI/UX of the refreshed bilingual Codex guide.
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