Creating an ARC-1 BTP Diagram with Codex and a draw.io Skill

I wanted one practical thing: an editable draw.io diagram for ARC-1 on SAP BTP that looks like it belongs in the SAP Architecture Center. My first attempts with generic diagram prompts were not really useful. They often had dark backgrounds, icons that were too large, and arrows running through boxes. I wanted something closer to the SAP examples: a white canvas, the right BTP areas and service icons, understandable flows, and an editable draw.io file that I could still correct by hand. That became marianfoo/btp-drawio-skill, a skill for creating SAP Architecture Center-style .drawio files from plain text. Where this started I did not start this from zero. The main source was SAP itself, and there are two related projects that are easy to mix up: The SAP BTP Solution Diagram Guidelines define how these diagrams should look: levels, areas, colors, icons, connectors, labels, and legends. The complete guideline and editable examples are in SAP/btp-solution-diagrams. The SAP Architecture…