Claude Code sessions can now talk to each other and share context across terminals

Why it matters

Anthropic has added inter-session messaging to Claude Code on macOS and Linux, letting separate sessions exchange text messages and share context without users manually copying information between terminals. Communication works in both directions: a session can ask another a question and receive the answer, and Claude can initiate messages on its own when a change affects work happening elsewhere. The documentation points to use cases such as sharing insights, coordinating parallel workflows, and checking on long-running tasks. The mechanics differ by location: on a single machine, messages travel locally, while communication between different computers routes through Anthropic's servers, where only responses are possible. Administrators can restrict the capability through settings. The feature is absent from Amazon Bedrock, Google Cloud Agent Platform, and Microsoft Foundry. The update matters because it turns Claude Code from a single-terminal tool into something closer to a coordinated multi-agent workspace, while raising questions about how cross-machine traffic and admin controls are handled in enterprise environments.