Claude Code sessions can now message each other and the 200-subagent cap is gone.

2.1.224 shipped SendMessage and ListAgents as first-class tools so separate sessions on macOS/Linux address each other by name, governed by crossSessionInbound and dialogExpiry. Auto mode routes inbound message content through the permission classifier before dispatch, treating cross-session text as untrusted input rather than instructions, which is exactly the right default given story #1. 2.1.225 extends this to Remote Control sessions on other machines. Multi-session orchestration is now a supported topology instead of a wrapper-script problem.