Thoughts on Programming

Xcode 26.4 is out. There’s a long list of fixed issues and improvements, but my favorite fixes the issue with Codex I posted the workaround for earlier.

I enjoyed this post, and I think it’s got some really good observations. I do think it underestimates the power of having working software that really does something, gives you a sense of what you wish it did instead, etc.

I’ve been working on a native Mac app, and here are some details of some recent sessions, troubleshooting hangs and lag with Instruments and Codex.

This is a life saver if you’re using the Codex app with Xcode.

Looks interesting. Yet another thing to put on the list to check out.

This was one of the easiest Rails upgrades I’ve done yet. Also, since I’ve been posting about using AI agents, and here’s what deploying the newly updated app looked like.

This post about the RubyGems situation seems to round up the various accounts I’ve read separately and corral them into a single location. I think that having RubyGems and Bundler taken over by Ruby Core makes sense for the stability of the ecosystem.

As part of my ongoing experiments using AI agents, I created two specialized agents that work together to automate an entire release process—from test verification through production deployment. Read more about it here.

Over the past few days, I’ve been experimenting with a new-to-me workflow: using [git worktrees](https://git-scm.com/docs/git-worktree) to let AI agents try multiple parallel implementations of the same feature. It’s been interesting enough to share.

Merry Christmas to the Ruby team, and thanks for the annual gift.