I Read OpenAI Codex's Source and Built My Workflow Around It

I cloned the Codex repo and started reading. Not the README. Not the blog post. The actual Rust source under codex-rs/core/. After dissecting the architecture in my previous post, I wanted to answer a different question: how do you actually build a workflow around this thing? The answer turned out to be more interesting than I expected. Codex CLI is not just a coding assistant you run in the terminal. It is a platform with five distinct extension points, each designed to integrate into differen