displayName
SDKMessage / SystemMessage
messageType
SystemMessage
subtype
none
direction
core-to-user
terminal
false
errorCategory
none
payloadSchema
type
SystemMessage
fields
- session_id
- model
- tools
- mcp_servers
- permission_mode
description
Initial system message emitted at session start summarizing the active
model, tool roster, MCP servers, and permission mode.