Mastering Codex and the OpenAI Agents SDK in 5 Days

Getting Started With the Codex CLI: Install, AGENTS.md, Approval Modes and the Sandbox, Common Commands

Install the Codex CLI, understand what it reads to make sense of your project, what stops it from touching files it shouldn't, and finish your first real task with it.

Codex, Level Up: Cloud Tasks, Code Review, MCP Integration, Custom Instructions, IDE Integration

Grow Codex from a single terminal session into a full working style: running cloud tasks in parallel, reviewing PRs, wiring in external tools, and reaching for it inside the IDE.

The Responses API and Built-in Tools: Function Calling, Web Search / File Search / Computer Use, Structured Output

Look one layer below a finished product like Codex: how the Responses API organizes the model, tools, and multi-turn state, and exactly how it differs from Chat Completions.

The OpenAI Agents SDK: Agents, Handoffs, Guardrails, Sessions, Tracing

Fold yesterday's hand-written loop into a few lines of API with the official Agents SDK: how agents hand off to each other, how to put guardrails at the entry and exit, how to remember multiple turns, and how to see every step clearly.

Choosing and Combining Claude and Codex: A Real Side-by-Side on the Same Task, a Write-One-Review-One Mixed Workflow

Run the same task through both Codex and Claude Code, compare them across four dimensions — how you brief them, approval, verification, and cost — then combine the two tools into a daily write-one-review-one workflow.