This is a TiddlyWiki plugin that integrates the Kroki diagram web service into TiddlyWiki, allowing you to create diagrams as regular tiddlers in suitable formats such as graphviz (https://graphviz.org/) or plantuml (https://plantuml.com/), and have them rendered as SVG images in your TiddlyWiki.

While the plugin requires access to a Kroki instance for creating and editing diagrams, it doesn't require that for showing the diagrams; this is because the plugin takes care of storing the SVG data in each diagram tiddler. From TiddlyWiki's point of view, they are just SVG images and therefore, for visualizing the contents of your TiddlyWiki, you can rest assured that everything in it is self contained, without relying on external files or services.