Advanced Prototyping for PMs with OpenAI Codex CLI

Matthew Moore

Ex-Google, Ex-Samsung, Exited Founder

Advance to the `top 1% level` of PM prototyping ability

Being a PM in 2026 is so competitive. Not only do you have to understand the market and the user, but now you also have to be able to help build early revisions to put in front of early users. And soon, you'll have to be able to prototype AI-powered multi-modal apps.

This workshop will give you a major headstart.

By the end of the workshop you'll have:
- setup your computer to make a new multimodal llm app with codex cli any time
- made your first voice app to interface with your calendar and emails (gmail / Gsuite)
- setup custom tools and skills within codex cli
- made a small fleet of agents
- understand AI harnesses better than many engineers

What you’ll learn

Workshop agenda

AI Review: AI CLIs, Agents, Tool Calls, Skills, MCPs, Harnesses
After a little demo of what we'll all build, a quick overview of the technical terminology we'll go over.
Computer Pre-req Setup
Get comfy with the terminal together, install helpers like Ghostty and/or OhMyZsh, fnm & node, codex cli, vscode (opt: cursor or antigravity). Google tokens. These terms will start to make sense!
Project Setup & **The AI Harness**
Each participant comes up with a concept, we each setup our own project. Most importantly, we cover in depth about what a harness is to get the most out of the AI
Lunch break / Free time
Catch up on real life for a few
Small Group Coding Breakouts
Define MVPs, break out into small groups or individual work time with instructor doing rounds to answer questions. Most folks will usually get Google Calendar and Google Email processing, or X.
Select Demos, Open Mic
Classmate show and tell, optional for all. Open conversation for what worked, didn't, how to improve, what to do next.
End
Goodbyes, how to stay connected