app.didpic.chat.findOrCreateConversation

{
  "$type": "com.atproto.lexicon.schema",
  "defs": {
    "main": {
      "description": "Start a conversation with 1-9 other people (2-10 total including the caller). With exactly one other DID, returns the viewer's existing 2-person conversation with them if one already exists rather than creating a duplicate. With 2+ other DIDs, always creates a new conversation - multiple separate group conversations with the same members are allowed. Membership is fixed at creation - no adding someone after the fact, though a participant can leave a group afterward. Fails with Blocked if ANY two named participants block each other, not just the caller and an invitee.",
      "errors": [
        {
          "name": "Blocked"
        },
        {
          "name": "InvalidRequest"
        }
      ],
      "input": {
        "encoding": "application/json",
        "schema": {
          "properties": {
            "participantDids": {
              "items": {
                "type": "string"
              },
              "maxLength": 9,
              "minLength": 1,
              "type": "array"
            }
          },
          "required": [
            "participantDids"
          ],
          "type": "object"
        }
      },
      "output": {
        "encoding": "application/json",
        "schema": {
          "properties": {
            "conversationId": {
              "type": "string"
            },
            "created": {
              "description": "False when an existing 2-person conversation was found and reused instead of creating a new one.",
              "type": "boolean"
            }
          },
          "required": [
            "conversationId",
            "created"
          ],
          "type": "object"
        }
      },
      "type": "procedure"
    }
  },
  "id": "app.didpic.chat.findOrCreateConversation",
  "lexicon": 1
}