Your agent
builds the theme.

Connect Claude, Codex, Cursor or any MCP client. It reads your project, finds the real blocks and patterns, and edits the same canvas you do. You open the builder and check its work.

Open the builder
  • Claude
  • ChatGPT
  • Codex
  • Cursor
  • and any MCP client with OAuth

What it can do.
Everything you can.

The same project.

The agent changes your saved draft, section by section. Open the project and its work is on the canvas, where you can keep editing by hand.

It reads the real schema.

Every block, pattern, setting and allowed child can be looked up, so it builds from what exists and an invalid edit is refused rather than saved.

It works in your Styles.

Color schemes, font pairs, sizes and corners are tools too. Ask for a warmer palette and it changes the scheme once, not every block on every page.

It can check its work.

It can prepare a rendered preview of any template with the real theme files, and read back exactly what it changed.

Before you connect it.

Do I need Pro?

No. An agent can build on Free, with the same limits as you. Downloading the ZIP, publishing and restoring versions need Pro, by hand or through an agent.

Can an agent change my live site?

Not by default. Edits land in the Fantasma draft. Publishing is a separate permission that starts switched off, and it also needs a connected site and Pro. Fantasma tells the agent to ask you first.

Which projects can it see?

The permissions apply to all projects you own. You can change or remove them in your account at any time.

What if we both edit at once?

Each edit checks the revision it read. If the project changed in between, the edit is refused and the agent has to read again.

Open an empty section.
See how far you get.

The whole builder is free, with no card and no timer. Pro comes in when you are ready to put the theme on your site.

Open the builder