I contribute to Happy Coder, an open source agent client (mobile app, desktop app, and web app). The project is just a UI layer for existing agents. Adding Codex specific UI and plumbing last week was a 2,600 line diff that took a contributor 3 evenings. And it should be even less plumbing for the next agent.
I'm looking for developers to try integrating their agents and tell me what's broken or awkward. I'd appreciate feedback on where the abstractions leak or what's missing. Even with the friction of using someone else's codebase, it could be less work than starting from zero.
I keep seeing these proprietary clients charge $50/month for basically the same plumbing everyone needs. Selfishly I would like open source and free to win this category here.
GitHub: https://github.com/slopus/happy (MIT License)