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.
context window — The maximum amount of text a model can consider at once — its working memory for the current conversation or task.
Why it matters
Cross-session messaging removes the re-explain-yourself tax when running parallel Claude Code sessions, and the summary-only boundary matters for what context windowThe maximum amount of text a model can consider at once — its working memory for the current conversation or task.Full definition → does and does not cross between them.
