Create a sandbox image
Create a personal-draft sandbox image from a Dockerfile and respond 201 with its detail. Build it (POST .../build) before a computer can boot from it. Guest callers are denied (a write).
Authorizations
MCPJam API key (sk_…). Create one at Settings → API keys. Guest sessions cannot use the API, and API keys cannot manage other API keys.
Path Parameters
ID of the hosted project that contains the server.
Body
Create a sandbox image from a Dockerfile. The Dockerfile must start FROM an allowlisted official base pinned by @sha256 digest; only FROM + RUN are supported.
Response
The sandbox image was created.
A project's custom Computer image: a digest-pinned Dockerfile plus its latest build.
user = a personal draft; project = shared with the whole project.
user, project One build of a sandbox image's image.

