Claude Code Session Messaging: How to Send Messages to Your Other Sessions
If you run more than one Claude Code session at a time, you have probably played human courier: switching between terminals, copying a finding from one window, and pasting it into another. Claude Code session messaging, shipped in v2.1.224 on August 7, 2026, removes that copy-paste loop. One session can now tell another itself — by name — with a plain-text note that arrives at the other session’s next tool round. This guide explains what cross-session messaging is, how to use it, what it can and cannot do, and how to coordinate parallel worktrees without becoming the messenger. ...