There's multiple tools that generate architecture diagrams from text/code (Mermaid, LikeC4...). You start using one and tell the model to generate the text for the architecture diagram and it'll do it. Stuff like https://erode.dev tries to use LLMs to keep it in sync.
Spec-mode in the Kiro IDE generates requirements and design docs for a feature; the design always contains one or more Mermaid diagrams of the arch in the feature.
