[LoganDark]

What harness are you using? Some of them (e.g. OpenCode) mutate the system prompt every turn, and therefore can't work with a KV cache.

I've had the best luck with Pi so far, but it comes without some bells and whistles you might be used to (e.g. plan mode, subagents, MCP client support)

[mbitai]

I've also had good results with Pi, and I got used to the new workflows without subagents, MCP, etc.