On the Developer Platform page, click the + Create application button to start setting up a new Worker.

In the "Ship something new" dialog, click Select a template to browse the available framework starters.

From the template list, select the Astro Framework Starter (marked as Featured). This gives you a ready-made Astro project configured for Cloudflare Workers.

On the "Set up your application" page, configure the following:

• Git account - Select your GitHub account or organisation.
• Create private Git repository - Keep this checked unless you want public code.
• Project name - Enter a name using lowercase letters and hyphens only (no spaces).

Once everything looks good, click the Deploy button.

Cloudflare is now setting up your Git repository and deploying your project. This may take a few seconds - wait for it to complete.

Wait for the build and deployment to finish. You'll see the build logs showing each stage. Once complete, click Continue to project to view your new Worker.

The overview page shows your project's metrics, bindings, and deployment history. Note your .workers.dev URL at the top - this is your live site address. Click on Settings to continue.

In the Settings tab, click + Add next to Domains & Routes to add a custom domain.

A panel opens on the right. Select Custom domain to connect your own domain or subdomain to this Worker.

Enter your desired domain or subdomain (e.g. choose-a-subdomain.dhcy.sg). Cloudflare will automatically configure the DNS record and provision an HTTPS certificate for you. Click Add domain to save.

Scroll down to the Build section. Click on the Git repository name to open it on GitHub.

On the GitHub repository page, click the green <> Code button to reveal the clone URL dropdown.

Copy the HTTPS clone URL from the dropdown. You'll paste this into Antigravity to connect your repository.

Open Antigravity. On the welcome screen, click Clone Repository to connect the GitHub repo you just created.

Paste the HTTPS clone URL you copied from GitHub. Select Clone from URL from the dropdown.

Choose a folder on your computer where the repository will be saved, then click Select as Repository Destination.

Antigravity needs access to your GitHub account to clone the repository. If this is your first time using Antigravity, A dialog will appear asking you to authorise via GitHub. Click Open to open the GitHub device activation page in your browser.

A GitHub Device Activation page will open in your browser. You may be prompted to login to your Github account. After logging in, Click Continue to proceed.

Paste in the device code. Click Continue to authorize the connection.

Review the permissions Antigravity is requesting. Under Organization access, click Grant for any organisations you need. Then click Authorize Google-Antigravity.

You'll see a success message confirming your device is now connected. You can close this browser tab and return to Antigravity.

If permissions were not assigned properly during authorisation, you may see an error like this when returning to Antigravity. Don't worry - this can be fixed by signing out and re-authorising with the correct permissions.

If you realize you forgot to grant organisation permissions, go back to Antigravity and use the GitHub account menu to Sign out. Then return to Step 15 and run the authorization flow again, making sure to grant organisation access in Step 21.

Back in Antigravity, a dialog asks if you'd like to open the cloned repository. Click Open to load the project.

Your project is now open in Antigravity - an agent-first coding environment. Use the chat panel on the right to describe what you want to build, and Antigravity will draft a plan for you.

Antigravity will present a step-by-step plan for the changes. Read through it carefully - if you're happy with the plan, click Proceed to let the agent start coding. Otherwise, continue chatting to refine it until you're satisfied.

Antigravity executes the plan, editing files and writing code in real time. You can watch the progress in the editor as each step is completed. Occasionally it may pause and ask for your input to continue — for example, to confirm running a terminal command — just respond in the chat and it will carry on. You may also need to install coding dependencies such as Node.js — download and install it from nodejs.org, then let Antigravity continue.

Once the agent finishes, it generates a Walkthrough — a detailed summary of everything it built and changed. Open it by clicking the Walkthrough tab at the top of the chat panel. Read through it carefully to understand what was created, which files were modified, and why each decision was made.

Type "open a preview window" in the chat to launch a live browser preview of your site. If anything doesn’t look right, take a screenshot and paste it back into the chat — the agent can use it to understand exactly what to fix. Keep iterating until you’re happy with the result.

In Antigravity's left sidebar, click the Source Control icon to open the Source Control panel. Click the + icon next to each file under Changes to stage it. Then click Generate to automatically write a commit message. Finally, click the dropdown arrow next to Commit and select Commit & Push to save your changes to GitHub. Cloudflare will detect the new commit and publish your updated site to the web within seconds.