Very cool! I launched something similar as well. My idea was to create a working document in which people could develop their own tools and agents. Conversations with coding agents are treated as editable, executable documents. Both the person and the agent can write on the same page. Rather than correcting a mistake in a follow-up, you can rewrite it, delete a detour, or edit and re-run an earlier prompt. The file is always readable Markdown. Check out: https://piary.dev/

Feel free to get in touch if you are open to an exchange, you can find my contact details in the write-up.

Years ago I just used Jupyter notebooks with a bash (or many others) backend to have a similar thing.