From the spec:

The purpose of the Development Container Specification is to provide a way to enrich containers with the content and metadata necessary to enable development inside them. These container environments should be easy to use, create, and recreate.

A development container is a container in which a user can develop an application. Tools that want to implement this specification should provide a set of features/commands that give more flexibility to users and allow development containers to scale to large development groups.

There is a neat way to use Coder with the devcontainer CLI, but it would be great if the Coder agent had first class support for running workspaces via a devcontainer.

Note: We now have docs on using our Devcontainers Alpha.