d2-diagram

Draw a software architecture, system, data-model or call-flow diagram as D2 text laid out by TALA (D2's whiteboard-style engine, open source since D2 0.9), look at it in the terminal before anyone opens an image, and check that the picture says what it claims — d2 --layout=tala x.d2 x.txt renders the layout as Unicode box drawing, --ascii-mode standard as plain ASCII for a README, and assets/d2-facts.mjs reads the drawn boxes and arrows back out of the render and holds them to a fact sheet. Loop: write .d2 → d2 fmt --check / validate → facts → terminal render → PNG → fix the text. Use when asked for a D2 diagram, an architecture diagram kept as editable text in the repo, a TALA layout, a diagram that shows in a terminal or a code block, or when the repo already has .d2 files. Not for animations or figures with a moving walk (explanatory-animation, explain-with-anim).