LLMs make it really trivial to work with MermaidJS. Just yesterday I used it to sketch out some business logic. Seeing the whole flowchart like that helped me catch some corner cases.
Which cheap LLMs are good for Mermaid, and to sketch graphs from code? I had to switch between the cheap LLMs and "tutor" them a bit to edit Mermaid in a Markdown file, although Claude seems perfect.