Claude Code sessions can now message each other locally via new ListAgents and SendMessage tools

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Anthropic rolled out cross-session messaging for Claude Code on 2026-08-07 for macOS and Linux, requiring version 2.1.224 or higher. Two new tools do the work: ListAgents discovers other active sessions on the machine, and SendMessage delivers text to one by name; messages between sessions on the same machine stay local and never touch Anthropic's servers. Sessions send a summary rather than history or files, the receiver picks it up mid-task, and messages explicitly cannot approve permission requests or change configuration — making it a coordination channel for developers running several agent terminals at once, not a privilege-escalation path.