Anthropic's coding tool, Claude Code, has gained a feature that lets separate sessions send messages to one another on macOS.
The change was reported by 9to5Mac under the headline "Claude Code now lets sessions talk to each other on macOS," and by MacRumors, which described it as "Claude Code Adds Cross-Session Messaging on macOS." Anthropic documents the capability on its own developer site, in a page titled cross-session messaging.
The feature also surfaced on the front page of Hacker News, where a post titled "Message your other Claude Code sessions" pointed directly at Anthropic's documentation and drew 105 points and 44 comments — a sign that the developers who actually use the tool took notice.
Beyond that, the available reporting is thin on specifics. Both Mac-focused outlets frame the addition the same way: sessions, previously isolated from one another, can now communicate, and the capability is tied to macOS.
Why this is more than a minor toggle: Claude Code is a terminal-based assistant, and heavy users commonly run several instances at once — one working through a bug, another writing tests, another reading through unfamiliar code. Until now, each of those windows was effectively an island, with no way to hand off findings except through the person sitting in front of them. Letting sessions message each other removes the human as the required relay.
It matters because it nudges AI coding tools away from being a single chat window you supervise and toward a set of workers that can coordinate among themselves — a small change in plumbing with large implications for how much of a project one person can keep in motion at once.