I'm working on what might be called an "AI-first" programming language too, but for syntax I'm focusing on familiarity. Both because I presume LLMs will have an easier time generating familiar code, and because humans will have an easier time reviewing it.
Syntax is only a small portion of being AI friendly though, IMO. A huge part of my own effort is safety and compile-time feedback: a sound static type system, sandboxed execution, strong immutable patterns, linting, and advanced type system features like ADTs, distinct types, extension types, units of measure, etc.