> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zap.wzrd.tech/llms.txt
> Use this file to discover all available pages before exploring further.

# Catalog stubs

> Providers Zap knows about but hasn't implemented yet: doctor lists them as catalog-stub, and acquire() fails loudly instead of guessing.

Catalog stubs are sandbox and compute providers Zap tracks but has not yet verified with a first-party adapter. A stub claims nothing beyond the contract minimum:

* `acquire()` always throws `CATALOG_STUB` — a stub never pretends to run anything.
* `zap doctor --json` lists each stub with `tier: "catalog"`, `verified: false`, its `kind`, and a `docsUrl` remediation link.
* Every manifest carries a `kind`: `sandbox`, `gpu`, `inference`, `computer-use`, or `document`.

Current stubs include:

| id                   | kind         |
| -------------------- | ------------ |
| `catalog:baseten`    | inference    |
| `catalog:blaxel`     | sandbox      |
| `catalog:freestyle`  | sandbox      |
| `catalog:orgo`       | computer-use |
| `catalog:runpod`     | gpu          |
| `catalog:tensorlake` | document     |

To use a stubbed provider today, run it behind the [self-host adapter](/sandboxes/selfhost) or pick a [first-party provider](/concepts/sandboxes) with the same isolation class.