{
  "id": "protocol-message:system-message",
  "_kind": "ProtocolMessage",
  "_file": "extensions/protocol-messages/claude-code-protocol-messages.yaml",
  "_cluster": "extensions",
  "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\nmodel, tool roster, MCP servers, and permission mode.\n"
  },
  "outgoingEdges": [],
  "incomingEdges": [
    {
      "from": "agent-core-impl:claude-agent-sdk.core@current",
      "to": "protocol-message:system-message",
      "kind": "emits_message_type",
      "attributes": {}
    },
    {
      "from": "agent-core-impl:claude-code.core@1.x",
      "to": "protocol-message:system-message",
      "kind": "emits_message_type",
      "attributes": {}
    },
    {
      "from": "provider:anthropic",
      "to": "protocol-message:system-message",
      "kind": "emits_message_type"
    }
  ]
}