Claude Code in Antigravity

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. For this setup we’ll be pointing to the marketplace folder inside the extracted files.

• On Windows: right-click the ZIP and choose “Extract All” — do not just double-click the ZIP and work from inside it. That’s not actually extracted, it’s a temporary view
• On Mac: double-clicking the ZIP will create an extracted folder next to it — that’s the real folder
• Move the extracted CCOS folder somewhere permanent that you won’t accidentally delete — like Documents/CCOS
• You’ll need the marketplace folder path later, so remember where you put it

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 and install Claude Code

Claude Code is Anthropic’s command-line tool that powers the AI inside Antigravity. Install it so it’s available when we add the extension.

Install the Claude Extension in Antigravity

Open Antigravity and install the Claude extension by Anthropic. This adds a Claude 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 “Claude” and install the one by Anthropic
• Once installed, you’ll see a Claude icon in the sidebar — that’s where your AI conversations happen

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 anything else 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 its own 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

Make sure Claude Code and the extension are up to date

Before adding the marketplace, make sure you’re running the latest version of both Claude Code and the Claude extension in Antigravity. Marketplace support requires a recent update.

• In Antigravity: go to Extensions, find Claude, and check for updates
• For Claude Code itself: run the update command in your terminal or re-download from the Anthropic docs
• If the /plugins command doesn’t appear in the next step, this is almost always why

Open the plugin manager and add the CCOS marketplace

In the Claude chat panel (not the Gemini panel), type /plugins and select “Manage Plugins.” Click the Marketplaces tab. You’ll need to paste in the full path to the marketplace folder from your extracted CCOS files.

• On Mac the path might look like: /Users/yourname/Documents/CCOS/marketplace
• On Windows it might look like: C:\Users\yourname\Documents\CCOS\marketplace
• This must be the path to the extracted folder — not a path inside a ZIP file
• If you’re not sure how to get the full path: on Mac, drag the folder into Terminal; on Windows, click the address bar in File Explorer and copy the text

Verify the marketplace loaded

If you did it correctly, you’ll see a ccos-plugins marketplace listed in the Marketplaces tab. Click into it to explore the available plugins and skills. Every skill in the CCOS system is now available to use in any project you open in Antigravity.

Start your first conversation with the cc-help skill

Open a new Claude conversation in the sidebar and paste the prompt below. The cc-help skill will orient you and recommend your best next step — which for most new users is running cc-create-dna to set up your Creator DNA context files.

Set up your Creator DNA

This is the most important first step. 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 sounds and looks like your business — not generic AI content.