{
  "id": "hook-surface:message-received",
  "_kind": "HookSurface",
  "_file": "channels-hooks/hook-surfaces/canonical/lifecycle-and-native-stubs.yaml",
  "_cluster": "channels-hooks",
  "attributes": {
    "eventName": "MessageReceived (canonical)",
    "displayName": "MessageReceived (canonical)",
    "kind": "canonical",
    "direction": "event",
    "blocking": false,
    "family": "in-process",
    "payloadSchema": {
      "type": "object",
      "required": [
        "message_id",
        "delta"
      ],
      "properties": {
        "turn_id": {
          "type": "string"
        },
        "message_id": {
          "type": "string"
        },
        "index": {
          "type": "integer"
        },
        "final": {
          "type": "boolean"
        },
        "delta": {
          "type": "string",
          "description": "New assistant message display text delta."
        }
      }
    },
    "description": "Fires as assistant message text is received for display. Handlers may\ntransform display-only text without changing stored transcript content.\n"
  },
  "outgoingEdges": [],
  "incomingEdges": [
    {
      "from": "hook-surface:claude.message-display",
      "to": "hook-surface:message-received",
      "kind": "canonicalized_to",
      "attributes": {}
    }
  ]
}