Jai is the best language for agents. Even in its closed beta state agents are very good at following its syntax and semantics.
Fast compile times and very good error messages also good at feedback loops.
I've been test-driving GLM-5.3-flash for Jai for some time, and it hasn't hallucinated a single language construct. I'm not even talking about actual frontier models.
It even gets Jai macros right, even though they are largely undocumented still. Either there's enough training material already, or rules just make sense.
Rust no longer the defacto best language for agents
Compile times are too long, I'm always finding myself bottlenecked by time not intelligence
And the agents have gotten really at doing manual memory management now