Kit Author Skill

How to design, write, validate, and distribute kit artifacts (kind: sandbox and kind: mixin) for Docker Sandboxes. Kits are declarative — a spec.yaml plus an optional files/ tree — and the sbx engine translates them into container customizations at sandbox creation or kit add time.

Use this skill when:

• Writing a new kit (mixin or agent) from scratch
• Editing an existing kit in this repository
• Debugging why a kit's commands, files, network rules, or credentials are not taking effect
• Packaging, publishing, or consuming kits from OCI or git sources
• Reviewing kit PRs in this repository

References

• Official docs: https://docs.docker.com/ai/sandboxes/customize/kits/
• Spec package — types, validation, normalization — see spec/ in this repository
• TCK package — test compatibility kit — see tck/ in this repository
• Repository contributor guide — see CONTRIBUTING.md and README.md