> I don’t get it. I have been doing something similar for a month with opencode, is the new thing that the new sonnet model is fine tuned to call these tools “better” or simply that they have improved the devex to accomplish these things?

They fine tuned 4.5 to have `clear_tool_uses` marker tools that it understands without regressing the quality of future responses. You will however pay for the cache invalidation hit anyways, so it would need some evaluations how much this helps.