ChatMessage

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/microsoft-teams/refs/heads/main/json-schema/teams-graph-api-chat-message-schema.json",
  "title": "ChatMessage",
  "description": "Represents a message in a channel or chat.",
  "type": "object",
  "properties": {
    "id": { "type": "string", "description": "Unique identifier for the message." },
    "createdDateTime": { "type": "string", "format": "date-time", "description": "When the message was created." },
    "lastModifiedDateTime": { "type": "string", "format": "date-time", "description": "When the message was last modified." },
    "messageType": { "type": "string", "enum": ["message", "chatEvent", "typing", "unknownFutureValue", "systemEventMessage"], "description": "The type of message." },
    "importance": { "type": "string", "enum": ["normal", "high", "urgent"], "description": "Message importance." },
    "subject": { "type": "string", "description": "Subject of the message." },
    "body": {
      "type": "object",
      "description": "Message body content.",
      "properties": {
        "contentType": { "type": "string", "enum": ["text", "html"] },
        "content": { "type": "string" }
      }
    },
    "from": {
      "type": "object",
      "description": "Sender information.",
      "properties": {
        "user": {
          "type": "object",
          "properties": {
            "id": { "type": "string" },
            "displayName": { "type": "string" }
          }
        }
      }
    }
  }
}