Add a Sandbox Hub Image

Use this skill for new images under hub/<name>/, including visible templates and hidden/internal runtime images.

Scope First

1. Check repository instructions at the relevant scope before editing.
2. Inspect nearby templates:
   • generic base: hub/base-image, hub/node, hub/ts-app, hub/py-app
   • entrypoint examples: hub/expo, hub/vite, hub/nextjs
   • hidden/internal examples: hub/benchmark, hub/vibekit-*
3. Check the current git status and preserve unrelated user changes.
4. Decide whether the image is user-facing or internal:
   • User-facing: add useful metadata and README mention.
   • Internal/platform-managed: set "hidden": true and avoid README marketing.

Required Files

Create or update: