Claude Code sessions can now message each other

Claude Code sessions can now communicate with one another, giving developers a way to coordinate multiple agents working on the same project. The feature is available in Claude Code v2.1.224 on macOS and Linux.

How cross-session messaging works

A user can ask one Claude Code session to send a finding, question, or status update to another. Claude creates the message itself from the relevant prompt, rather than requiring the user to compose a detailed handoff.

Anthropic says the feature sends a summary, not the originating session’s full history or files. The receiving session can then continue from that context instead of forcing the user to repeat the task or explain the project again.

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“New in Claude Code: your sessions can now message each other. Instead of having to re-explain yourself in another session, you can now tell Claude to do it. It sends a summary (not your history or files), and the other session picks it up mid-task.”

The company describes several intended uses: handing off a discovery, coordinating work across parallel worktrees, checking progress on long-running tasks, and responding between sessions running on different machines. One session can also warn another when a change has broken something it is building.

Permission controls still apply

Messaging does not turn sessions into an unrestricted control channel. Cross-session messages cannot approve permission requests or change configurations. Commands such as /compact arrive as plain text rather than executable commands, and any action requiring permission still triggers an approval prompt in the receiving session.

That distinction matters: the update improves coordination, but it does not remove Claude Code’s existing user-approval boundaries. It also means the feature is closer to structured agent handoffs than shared access to every session’s files and state.

Anthropic has not said in the supplied announcement whether cross-session messaging is available on other platforms, nor does it provide performance data showing how much time the feature saves. The concrete change is nevertheless substantial for developers already running several Claude Code sessions: the sessions can now exchange concise, task-specific context without duplicating the user’s instructions.