How to Build an Advanced Agentic AI System with Planning, Tool Calling, Memory, and Self-Critique Using OpenAI API

A tutorial shows how to build an OpenAI API agent in a modular notebook setup.

It installs the OpenAI SDK, prompts for the API key securely, and uses gpt-5.2 as the core model.

The system is organized as planner, executor, and critic stages to separate reasoning, action, and review.

It adds tools for calculation, retrieval, JSON parsing, and file creation to make outputs more reliable and reproducible.