Developer and publisher of Claude Code; shipped the v2.1.224 release and controls the feature's server routing, default settings, and enterprise admin controls such as crossSessionInbound.
EN
Enterprise IT/DevOps administrators
Can disable cross-session messaging org-wide via managed settings (deny SendMessage and ListAgents, set crossSessionInbound to refuse), giving them leverage over adoption inside their organizations.
IN
Individual developers running parallel Claude Code sessions
Primary users and beneficiaries - coordinate parallel work, hand off findings, and check long-running task status without manually copying context between terminals.
TH
Third-party multi-agent orchestration vendors
Indirectly affected - commentary argues Anthropic folding a basic cross-agent notification primitive into Claude Code itself competes with tools these vendors sell.