I was doing that with (neo)vim and reached the point that I wanted to stop having to maintain a sorta-IDE. I'm now doing the same with agents (custom vscode extension), but I find this different for a number of reasons, primarily that I don't want Big Ai deciding how I can interact with and use Ai.

One thing I took from ATProto is a strong belief that user agency and choice are the penultimate design criteria. To those ends, I think that any agentic tooling needs to support the majority of users' choice about how to interact with it (SDK, API, CLI, TUI, IDE, and Web). My custom agent is headed that way anyhow, because there are times where I do want to reach for one of them, and it's easier to make it so with agents working on their own codebase (minus vscode because the testing/feedback I haven't figured out yet)