> agentic capabilities are very much on a roll-your-own-in-elisp basis

I use gptel-agent[1] when I want agentic capabilities. It includes tools and supports sub-agents, but I haven't added support for Claude skills folders yet. Rolling back the chat is trivial (just move up or modify the chat buffer), rolling back changes to files needs some work.

[1] https://github.com/karthink/gptel-agent