I don't think that "Anthropic models are trained for Claude Code's tool call shape". It's all about system prompt and model description (which is part of that prompt).

I observe that most models can deal well with the tools you provide.

Form time to time I analyze my sessions to see which tools could improve my (or my agent's) work. E.g. a background timer/watcher is on my todo list, so that I can chat with the agent session while its waiting for some shell response.

> Okay, this is slightly horrifying to me but also a bit genius...

If you're old enough to remember CGI web services, originally every request to a web server for non-static content launched a binary. Most of the web ran on that approach for a long time, later optimized with things like FCGI.