Claude Code sessions can now message each other across terminals

Anthropic added the ability for parallel Claude Code instances running on macOS and Linux to send messages to each other, share insights, and check on each other's status.

Why it matters: This is a step toward native multi-agent coordination inside a single coding tool, rather than users manually copying context between terminal windows. It fits Anthropic's broader push to have Claude Code handle more of its own orchestration, following recent moves like Auto Mode becoming the default execution mode.