Legacy gtdx CLI

gtdx was part of an older .gtxpack design-time extension proposal. It is not the current extension authoring path documented for Greentic.

Use the current CLI instead:

gtc wizard
gtc wizard --schema
gtc wizard --answers extension-pack-answers.json

For low-level pack edits, use gtc dev pack add-extension capability for greentic.ext.capabilities.v1 offers. See Writing Extensions.