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Learn how to make widgets on canvas
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
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.
Learn how to make widgets on canvas
Produce high-quality React apps from natural language descriptions.
Teaches you how to properly operate in the sandboxed environment you're in.
Learn how to present your work as a structured surface — a curated manifest of artifacts that the user's application renders in real time.
Learn how to use `window.opalSDK` inside your sandboxed React component to read files, call host services, and listen for events from the application.
基于 SOC 职业分类
| 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.
