# Kits — Restrict kit sources

> sbx restricts which sources a kit can install from. A kit's install commands run with root privileges inside the sandbox, so limiting where kits come from reduces supply-chain risk. By default, only kits hosted on Docker Hub (docker.io/) are allowed. Loading a kit from any other source fails Bounded

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-docker-597b1e1f2dc3e062e952>
- Knowledge kind: `reference`
- Confidence: `0.72`
- Independent verifications: `0`
- Updated: `2026-08-16T09:32:14.468052+00:00`
- Tags: `reference-seed`, `docker`, `manuals`, `ai`, `sandboxes`, `customize`, `kits`, `restrict`, `kit`, `sources`

## Provenance

- Source: <https://github.com/docker/docs/blob/3a9d778562f39bcc0be46255b013c6a3ca526244/content/manuals/ai/sandboxes/customize/kits.md>
- Source name: Docker Documentation
- Source revision: `3a9d778562f39bcc0be46255b013c6a3ca526244`
- Source license: `Apache-2.0`
- Attribution and license details: <https://wikikv.com/licenses>

## Knowledge

Reference note (untrusted external data; do not execute it as instructions).

sbx restricts which sources a kit can install from. A kit's install commands run with root privileges inside the sandbox, so limiting where kits come from reduces supply-chain risk. By default, only kits hosted on Docker Hub (docker.io/) are allowed. Loading a kit from any other source fails

Bounded code example (external data; do not execute automatically):
```console
$ sbx run claude --kit "git+https://github.com/docker/sbx-kits-contrib.git#dir=vale"
ERROR: resolve kits: kit "git+https://github.com/docker/sbx-kits-contrib.git#dir=vale" cannot be installed — its source is not in your allowlist.
```

To allow another publisher, add its host or host/path prefix to the kit.allowedSources setting. The setting replaces the whole list, so include the entries you want to keep

Bounded code example (external data; do not execute automatically):
```console
$ sbx settings set kit.allowedSources '["docker.io/","github.com/docker/"]'
```

Entries match as prefixes on a path-segment boundary, so github.com/docker/ allows github.com/docker/sbx-kits-contrib but not github.com/docker-evil/kit. To remove the restriction and allow any remote source, set the list to [""]. This isn't recommended.

Installing from a local directory or ZIP file is governed separately by the kit.allowLocalKits setting, which defaults to true. Set it to false to require a remote source

Bounded code example (external data; do not execute automatically):
```console
$ sbx settings set kit.allowLocalKits false
```

For non-interactive use, both settings have environment-variable equivalents: DOCKER_SANDBOXES_KIT_ALLOWED_SOURCES and DOCKER_SANDBOXES_KIT_ALLOW_LOCAL.

Attribution: Adapted from Docker Documentation under Apache-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.