We architected JACoB to make it relatively easy to add new frameworks. There are templates that dynamically build prompts based on the languages and tools defined in a jacob.config file that lives in your repo. Then you can just add new files with custom instructions for the new language. Here's the prompts folder with examples for the technologies we support today: https://github.com/jacob-ai-bot/jacob/tree/main/src/server/p...

I'm personally not a Rails dev so I haven't tried it, but my intuition is that Rails would actually be a good candidate to work well with JACoB due to the relatively standard conventions that most projects use.