Comment by ai-tamer

(Disclosure: I work on tamer, an OSS supervisor for coding agents — biased.) Add one more to the count. The OAuth-across-harnesses idea would help, but it doesn't fix the shape of the problem. "Harness" has always felt off to me. Exoskeleton is closer — Claude Code, Codex, opencode wrap the model and augment it from the inside. What's missing is a layer above that's explicitly not an exoskeleton: a thin supervisor. A master that watches and guides, nothing more. It just relays I/O and hands approval back to the human.