{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/Message",
  "title": "Message",
  "type": "object",
  "description": "Serializer for appending a message to an existing conversation without triggering AI processing.",
  "properties": {
    "content": {
      "type": "string",
      "nullable": true,
      "maxLength": 40000
    },
    "conversation": {
      "type": "string",
      "format": "uuid"
    },
    "contextual_tools": {
      "type": "object",
      "additionalProperties": true
    },
    "ui_context": {},
    "billing_context": {},
    "trace_id": {
      "type": "string",
      "format": "uuid"
    },
    "session_id": {
      "type": "string"
    },
    "agent_mode": {
      "$ref": "#/components/schemas/AgentModeEnum"
    },
    "is_sandbox": {
      "type": "boolean",
      "default": false
    },
    "resume_payload": {
      "nullable": true
    }
  },
  "required": [
    "content",
    "conversation",
    "trace_id"
  ]
}