I built a language and runtime that combines agentic calls/prompts with strict checks (running tests, compiling, git commit).

https://jaiph.org/

I then used it to build other tools -- a personal time tracker and a Wesnoth-like game (both not yet published). Basically, I maintain a Markdown file with a queue of tasks, and I run a Jaiph workflow in a loop that automatically picks up tasks one by one and develops them with no human intervention.