I've been working on DML, a Prolog-based DSL [0] used to define and orchestrate agents and LLM workflows. It's been quite fun, although - given the amazing capabilities of SOTA models - I am not so sure anymore how meaningful it will be to continue with this work. Anyways, the language and also supports DCGs, so it should allow for plenty of interesting ways to combine grammars, LLMs, agents etc.

[0] https://github.com/deepclause/deepclause-sdk