Agent-to-Agent Pair Programming: CLI Tool 'Loop' Lets Claude and Codex Work Together in tmux with Direct Communication

Axel Delafosse / Hacker News·medium signal

Developer Axel Delafosse published a deep dive on agent-to-agent pair programming, where Claude and Codex operate as co-agents — one as the primary worker, the other as reviewer — talking to each other directly via a CLI tool called 'loop' that launches both side-by-side in tmux with a bridge protocol. The approach mirrors how Google's A2A protocol enables cross-vendor handoff. 72 points, 23 comments on HN. Signals the shift from human-agent to agent-agent collaboration patterns.