Claude Code v2.1.224 Launches Cross-Session Messaging Feature With Built-In Permission Controls
Summary
Claude Code v2.1.224 launches cross-session messaging, enabling Claude instances to communicate across sessions and machines via ListAgents and SendMessage tools, with strict per-session permission controls that prevent messages from executing commands or altering configurations.
Key Points
- Claude Code v2.1.224 introduces cross-session messaging, allowing Claude instances to send plain-text messages between independent sessions on the same machine, across machines, or to Claude Code on the web using the ListAgents and SendMessage tools.
- Message delivery is controlled by inbound settings that can accept, hold, or refuse incoming messages, with permission boundaries enforced per-session, ensuring messages cannot approve actions, change configuration, or execute commands on the receiving end.
- Cross-session messaging is unavailable on native Windows, Amazon Bedrock, Google Cloud Agent Platform, Microsoft Foundry, and AWS Claude Platform, and can be fully disabled by administrators using deny rules for SendMessage and ListAgents combined with a refuse inbound setting.