II.
ProtocolMessage overview
Reference · liveprotocol-message:system-message
SDKMessage / SystemMessage overview
Initial system message emitted at session start summarizing the active model, tool roster, MCP servers, and permission mode.
Attributes
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.
Outgoing edges
None.
Incoming edges
emits_message_type3
- agent-core-impl:claude-agent-sdk.core@current·AgentCoreImplClaude Agent SDK Core (current)
- agent-core-impl:claude-code.core@1.x·AgentCoreImplClaude Code Core (1.x)
- provider:anthropic·ModelProviderProductAnthropic