Claude Code adds cross-session messaging

Anthropic's Claude Code now lets sessions message each other, sending summaries instead of history or files.

Users can instruct Claude to send a summary to another session, which picks it up mid-task.
Messaging works both ways: users can ask another session a question and get the answer back.
Claude can autonomously message another session when a change affects its work.
Available on macOS and Linux after updating Claude Code.

Developers using Claude Code can now coordinate work across sessions without re-explaining context, improving multi-task workflows.

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