I had lots of fun bootstrapping a coding agent without claude. Coding agent is conceptually very simple and Claude Code is not great at observability. So why not roll your own? I did it the old school way. Read the docs and write the code slowly and manually. The lines of code needed is surprisingly small to get things sky rocketed - 100 lines. I’m not good at TUI and don’t want to learn about TUI. So my initial goal is just to play around with the API and re-implement claude -p . It was quick. And then things got a bit wild. Of course the next step is to have repl mode to make the program interactive. I’m never good at readline. So I just run bun start -p 'implement repl for this project' … and then I got the little > working! And then I kept going…with the prevailing 1M context window I don’t even need a proper compaction implementation to keep it going. After three prompts to my custom little coding agent, it soon rewrote itself into this. This is just amazing...