Is it perhaps because this is for claude code but there's other tools that use anthropics api like custom agents? (some i prefer to use than claude code - e.g sketch.dev what is now called shelley at exe.dev) perhaps?
No, because this doesn’t actually “fix” any existing code. It’s only useful for helping an LLM to modify your code to adjust the caching parameters in the right place, but it doesn’t have the correct API for that.