I've seen a big improvement in LLMs writing macros since Opus 5.5 came out. What really helps I think is that I've written skill files with my own examples and instructions.

Same thing for image-based dev. without an agent.md file with good instructions on how to work with a live image it will do dumb things. this sort of workflow is jsut so far off the training distribution.

I think what changed recently isn't that LLMs got better at CL, they just got way better at taking my skill/agent.md files and reasoning through them.