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Teaches you how to properly operate in the sandboxed environment you're in.
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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.
Learn how to make widgets on canvas
Produce high-quality React apps from natural language descriptions.
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.
Learn how to design and write custom agent templates (sub-agents) inside your workspace, so you can delegate specialized work to custom sub-agents.
| name | run-in-sandbox |
| title | How to run in sandbox |
| description | Teaches you how to properly operate in the sandboxed environment you're in. |
| allowed-tools | ["sandbox.*"] |
When you call execute_bash function, it runs in a sandboxed environment. You
have acess to most bash commands. The PATH is configured to give you access to
node and python3.
Even though you can use heredoc to write and cat to read files, prefer the
built-in file functions, if they available.
