Advanced Setup

Codex in Antigravity

The power-user setup for OpenAI users — a full file browser, direct access to context files, and the CCOS marketplace installed via Codex’s plugin system. Best for people who aren’t afraid of seeing code and markdown.

You need the CCOS ZIP file to follow this guide. Download it below — this page will verify your active license. If you don’t have one yet, grab a license from the store.

Download CCOS ZIP ↓ Get a license →

  1. Unzip the CCOS file — properly

    Download the CCOS ZIP and fully extract it to a permanent location on your computer — like your Documents folder or Desktop. You’ll be pointing to folders inside this download in a later step.

    • On Windows: right-click the ZIP and choose “Extract All.” Do not just double-click the ZIP — that opens a temporary preview, not the real files
    • On Mac: double-clicking the ZIP creates an extracted folder next to it — that’s the one you want
    • Move the extracted CCOS folder somewhere permanent like Documents/CCOS
    A very common mistake on Windows: people open the ZIP, see the folders inside, and think they’ve extracted it. They haven’t. If your path includes \AppData\Local\Temp\ or still ends in .zip, you’re still inside the ZIP. Right-click → Extract All first.

  2. Download and install Google Antigravity

    Antigravity is Google’s free code editor. You don’t need a paid Gemini plan to use it. When it launches, it may ask you to sign in with a Google account — just use any personal Gmail account.

    Download Antigravity
    You do not need to pay for anything from Google. Antigravity is free. If you’re prompted to sign in, use a free Gmail account.

  3. Install the Codex extension in Antigravity

    Open Antigravity and install the Codex extension by OpenAI. This adds a Codex chat panel to the sidebar that can read and write files in your project.

    • Click the Extensions icon in the left sidebar (it looks like four squares)
    • Search for “Codex” and install the one by OpenAI
    • Sign in with your OpenAI account when prompted
    • Once installed, you’ll see a Codex icon in the sidebar — that’s where your AI conversations happen

  4. Create a new project folder

    In Antigravity, go to File → New Window, then File → Open Folder. Choose an empty folder on your computer — this is where CCOS will store everything it creates for you: DNA context files, lessons, site pages, and any other files the skills build.

    • Create a dedicated folder for CCOS — something like “My CCOS Workspace” in Documents is fine
    • Don’t use a system folder or an existing project — give CCOS a clean space
    • On Mac: you can find Documents in the left sidebar of the folder picker
    • On Windows: look for Documents or Desktop in the left panel

  5. Copy the CCOS marketplace and plugins to the right folders

    This step is the same as the Codex Desktop setup. You need to copy two things from your extracted CCOS folder to specific locations on your computer. These are hidden system folders that exist but you normally can’t see.

    • Copy the marketplace.json file from the CCOS .agents folder to your home folder at: ~/.agents/plugins/marketplace.json
    • Copy the entire plugins folder from the CCOS download to: ~/.codex/plugins/
    What does the ~ mean? The tilde (~) is shorthand for your “home folder” — the top-level folder for your user account on your computer. On Mac: /Users/yourname/ — so ~/.agents/ means /Users/yourname/.agents/ On Windows: C:\Users\yourname\ — so ~/.agents/ means C:\Users\yourname\.agents\ Folders that start with a dot (like .agents and .codex) are hidden by default. On Mac: in Finder, press Cmd+Shift+. (period) to show hidden files. On Windows: in File Explorer, click View → Show → Hidden items. If the .agents/plugins/ or .codex/plugins/ folders don’t exist yet, create them. Then copy the files in.

  6. Restart the Codex extension

    If the Codex extension was already running in Antigravity, close and reopen the Codex panel or restart Antigravity entirely. The marketplace and plugins are loaded at startup.

  7. Verify the CCOS plugins loaded

    In the Codex panel, open the Plugins page. You’ll see a dropdown that defaults to “Built by OpenAI.” Change that dropdown and you should see Course Creator OS Plugins listed. Click into it to browse the available plugins and skills.

    If you don’t see the CCOS marketplace in the dropdown, double-check that: (1) you copied the files to the right locations, (2) the folders actually exist and aren’t empty, (3) you restarted Codex/Antigravity, and (4) you’re running the latest version of the Codex extension.

  8. Start your first conversation with the cc-help skill

    Open a new conversation in the Codex panel and paste the prompt below. The cc-help skill will orient you and recommend your best next step.

    Paste this into Claude
    Use the cc-help skill

  9. Set up your Creator DNA

    Creator DNA is a set of context files about your brand, audience, tone, and design system. Once these are in your project folder, every CCOS skill automatically uses them to produce output that matches your business.

    Paste this into Claude
    Use the cc-create-dna skill

You’re all set up. Time to build something.

Your plugins are installed and your project folder is ready. Explore the full plugin library to see what’s possible, or head back to the start to pick a different setup path.

Explore Plugins Back to Get Started