Codex for Developers: Essentials — Code Review Playbook

A focused playbook for code review with Codex. Learners run /review against a base branch, give Codex a team checklist so it reviews the way the team does, triage its findings into fix, push back and ignore, and see how Codex reviews pull requests on GitHub when a company turns it on. They leave knowing Codex speeds up review but a human still owns the merge. About 45 minutes including the final.

What this course covers

The course runs across 3 topics, each one a short adaptive session rather than a recorded lecture. The tutor explains the idea, works an example, checks understanding, and adjusts the next step to the answer given.

Reviewing a branch with /review and the diff panel — Run /review against the base branch, uncommitted changes or a single commit, or review in the app's diff panel and comment on lines. Learners read every finding with its line and decide whether it is real.
Making Codex review the way your team does — Put the team's standards in a code_review.md and point to it from AGENTS.md so every review checks the same things. Learners triage findings into fix, push back and ignore, because Codex can miss issues and overstate others.
Pull request review on GitHub, and what humans still own — If the company has turned it on, Codex can review pull requests automatically or when someone comments @codex review. Learners decide what a human reviewer must always check and who owns the merge.

Skills you build

Results are measured against named skills in the OneRange taxonomy of more than 10,000 skills, so a manager sees proficiency per skill rather than a completion tick.

Who it is for

Software developers. The material is pitched at beginner level, and takes roughly 45 minutes at a typical pace. Because every session adapts, someone who already knows a topic moves through it quickly instead of sitting through an explanation they do not need.

It sits in the Tool: Codex track of the Vero AI Catalog, and can be assigned to one person, a team, or the whole company.

How it is delivered and assessed

Delivery is conversational and interactive, including code lab exercises. There is no video to sit through and no slide deck to click past.

Understanding is checked with a lab assessment of 5 items, with a pass mark of 70%.

Administrators can copy this course into their own library and adapt it — edit the outline, change the duration, swap the assessment format, or ground it in internal documentation so answers cite the company's own source material.

Also in this track

Codex for Everyone: Essentials — Data & Reporting Playbook — A focused playbook for turning a messy spreadsheet export into a simple, repeatable report with Codex, without writing code. Learners clean a copy of the file safely, have Codex build a one-page report, check the numbers against the source by hand, and set it up to re-run next week. About 45 minutes including the final.
Codex for Everyone: Essentials — Internal Tools Playbook — A focused playbook for building a small internal tool with Codex in the ChatGPT desktop app, without writing code. Learners pick a sensible first tool, plan it and let Codex build it on fake data, check every result by hand, and finish with a plain run guide plus a clear sense of when a tool needs an engineer. About 45 minutes including the final.
Codex for Everyone: Essentials — Prototypes Playbook — A focused playbook for turning an idea into a clickable prototype with Codex, without writing code. Learners go from a short brief to a working mockup on fake data, refine how it looks by describing changes, gather feedback, and write a clean handoff note so an engineer can tell what is real and what is not. About 45 minutes including the final.
Codex for Developers: Essentials — Refactoring & Migration Playbook — A focused playbook for refactoring and migrating code with Codex without breaking behaviour. Learners pin current behaviour with characterisation tests first, use Plan mode to split a migration into small steps they can each verify, and review every diff before moving on. They leave with a safe, repeatable pattern for changes larger than one function. About 45 minutes including the final.
Codex for Developers: Essentials — Your First Week with Codex — The developer starting point for Codex, OpenAI's coding agent. Learners pick where to run it (Codex in the ChatGPT desktop app, the CLI, the IDE extension or the cloud), have it explain an unfamiliar codebase, write prompts with a goal, context, constraints and a 'done when', plan before multi-step work, choose safe permissions, and review every change in the diff before keeping it. They set up a starter AGENTS.md and finish with a fix-and-explain lab.
Codex for Developers Pathway — Use Codex as a daily engineering tool, from your first week to automating engineering for a whole team. Also includes 4 optional playbooks to take any time after Essentials; they don't count toward the certificate.

Frequently asked questions

How long does this course take?

It runs roughly 45 minutes at a typical pace. Because every session adapts, someone who already knows a topic moves through it quickly instead of sitting through an explanation they do not need.

How is it assigned to a team?

An administrator assigns it from the Vero dashboard to one person, a team, a department or the whole company, and sees progress and results per person and per skill.

Can we customise it with our own documents and terminology?

Yes. Administrators can copy this course into their own library and adapt it — edit the outline, change the duration, swap the assessment format, or ground it in internal documentation so answers cite the company's own source material.

Course code TUL-CDX-DEV-122.