One command.
That is the setup.

It installs Codex CLI and every tool it needs, then checks that the command actually works. Copy the line for your computer, paste it into the named terminal, and press Enter.

Choose your terminal

Copy one line.

Mac or Linux

Open Terminal: press Command + Space, type “Terminal”, press Enter

$ curl -fsSL https://raw.githubusercontent.com/jtlgrowth/codex-cli-installer/main/install.sh | bash

Windows PowerShell

Open PowerShell: press the Windows key, type “PowerShell”, press Enter

> irm https://raw.githubusercontent.com/jtlgrowth/codex-cli-installer/main/install.ps1 | iex

Windows Command Prompt

Use this if the window says “Command Prompt” or “cmd”, or if the PowerShell line turned red

> powershell -NoProfile -ExecutionPolicy Bypass -Command "irm https://raw.githubusercontent.com/jtlgrowth/codex-cli-installer/main/install.ps1 | iex"

Then

Five steps and it is yours.

Close the terminal and open a new one. The new window loads the command that was just installed. On Windows, PowerShell or Command Prompt both work from here.
Type codex login, press Enter, and sign in with your ChatGPT account in the browser.
Type codex and press Enter. Codex is running.
Get the skills: open jtlgrowth.com/skills, enter the access code from the room, run the Codex line for your computer.
Name it: open a new window, type codex, then Use $setup to configure my AI chief of staff. It asks four questions. The last one is the word you type to open it, like ana. From then on: new window, type ana, press Enter.

If it does not work

The common fixes.

codex: command not found

Close the terminal, open a new one, and try again. The old window still has the PATH it started with.

Windows says 'irm' is not recognized

You are in Command Prompt. Use the Command Prompt box above. It starts PowerShell for the installation without changing your default terminal.

Windows says scripts are disabled

Use the Command Prompt box above. It applies the bypass to that one install command only.

node or npm is not recognized

Codex installs through Node. Open a new window and run the install line again. Still missing: on Windows, winget install OpenJS.NodeJS.LTS in PowerShell or Command Prompt; on a Mac, brew install node; or the LTS installer from nodejs.org. Then a new window and the install line again.

Typing your name (like ana) does nothing

Open a new window. The name works in Terminal, PowerShell and Command Prompt, but only in windows opened after setup finished. On Windows, closing it with Ctrl+C may ask Terminate batch job (Y/N)?: type Y, nothing is lost.

The installer is open source. Read the installer, or check the official Codex documentation.

One command.That is the setup.