Claude Code System Prompts

Inbound cross-session peer messages (SendMessage from your other sessions): 'accept' delivers them, 'hold' parks them for your review without letting Claude act, 'refuse' opts this session out. An explicit value always wins. Unset (mode parity): a message auto-delivers only when the sending session's permission-mode class matches yours (bypass↔bypass or prompting↔prompting); a mismatched sender's message is held for your approval; a sender that asserts no class is held only while this session bypasses permission prompts.