Genuine question: Does the Agent harness matter ? I mean why use Claude CLI ? (As I mentioned elsewhere) I use oh-my-pi (and opencode, and toad) but use (clien

Genuine question: Does the Agent harness matter ? I mean why use Claude CLI ? (As I mentioned elsewhere) I use oh-my-pi (and opencode, and toad) but use (client paid) Opus 5 with these harnesses. All three of these understand AGENTS.md