I took part in ISUCON 2026. The team name was "Cherry Burger" (チェリーバーガー), and the team was one human, running Claude Code AI agents as one director and three to four implementers. I used himkt/cafleet to orchestrate the agents. The final score was 134,946, probably around 100th place (not yet confirmed, as I wrote this before the final results were announced).

ChatGPT provides an API for Fine-tuning that allows you to train it on your own data, so I used it to learn from my past tweets and created a bot that tweets in a style similar to mine. I wrote it in Deno, which has just had its v2 release, and it runs on Deno Deploy (Deno Cron).

I decided to leave Hatena Blog, which I had been using for about 10 years since 2014, and move to a self-made (big lie) blog system.

I created a web app for a "ato de yomu" (Japanese for “read later”) reading list.

I'm not sure if "reading list" is a common term, but it refers to the reading list feature that comes with Safari. The "ato de yomu" app has the following features:

• You can save web articles that you want to read later.
• You can keep a history of articles you have read.
• You can view and subscribe to other people's lists.

I created Editjiro, a clone app of Editaro, which is a text editor for writing drafts before posting to emails or chats.