This concept only applies to Tectonic’s V2 interface. It is not relevant to the original (“V1”) interface.

A Tectonic workspace is a directory tree for building documents. The top-level directory of a workspace contains a Tectonic.toml file.

At the moment, a workspace contains exactly one document, having its source rooted in the workspace root. In the future, Tectonic may be extended so that a workspace might contain more than one document.