The AIs tend to feel my presence and obey the existing code structure. Would probably be different for me if I had projects created from scratch.
So in other words, "follow the style of project XY" (that is part of your workspace) as an instruction might get you somewhere.
Review the diffs as carefully as if a new coworker had written the code.
Why are you putting code style in SKILL.md? Put it in AGENTS.md and to have it in the context all the time IMO.
For Nim code, I think these are necessary at the minimum: