- Introduces a standard communication layer for Liquid storefronts with theme‑emitted DOM events (e.g., shopify:product:view) and app/agent actions
- Apps can subscribe to these events via plain JavaScript and receive payloads without extra API calls; actions like Shopify.actions.updateCart can be called to trigger theme behavior and can be overridden to avoid page reloads
- Provides a unified, cross‑theme events/actions API and documentation for implementation