AgentsRoom agent to agent messaging: a Claude Code agent writes to a Codex agent and gets an answer back

One recorded exchange between two saved agents of the same project, each running a different CLI. The DevOps agent (Claude Code) is asked to reach "our developer", resolves the recipient itself from the live roster, and writes to it with the agents_send MCP tool. The message lands in the Full-Stack agent (Codex) as a real inbox item, which reads it with agents_read_inbox, accepts it with agents_ack and starts working, then answers in the thread. The sender never blocks: it is notified in its own terminal when the reply arrives. No copy-paste between terminals, no shared task board, no human relaying messages between two AI coding agents.