Cool, I did a similar thing last week.

I made a custom Payload CMS block that allows to create and update excalidraw diagrams within the CMS. It supports dark and light mode switching and rendering inline or as external SVG.

And last weekend I added MCP server with Oauth so I could generate and update those diagrams and add them to post drafts from Claude. I think it is more convenient since I don't have to use API billing model and don't need to build a custom UI.

Here is an example post: https://www.janhouse.lv/blog/network/self-hosting-tailscale-...

Originally I wanted to sync posts from Obsidian but it doesn't have good enough image handling which I sometimes need and I needed extra metadata to unlist or password protect or noindex some posts.