| name | build-widgets |
| title | How to build widgets |
| description | Learn how to make widgets on canvas |
| allowed-tools | ["files.*"] |
Here's how you build a widget:
Create a new subdirectory where the app will go. Check to see that this is a new directory.
Write the React app using Opal SDK in that subdirectory. Rules for app crafting
Create or update the surface to include the widget.
Get back to the user with a friendly message notifying them that the widget was added.
Learn how to make widgets on canvas
Learn how to design and write custom agent templates (sub-agents) inside your workspace, so you can delegate specialized work to custom sub-agents.
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How authenticated HTTP calls to the Opal backend work — the host/guest architecture, fetchWithCreds, the fetch allowlist, and the OpalBackendClient migration. Read this before adding, modifying, or debugging any backend call.
Produce high-quality React apps from natural language descriptions.
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