diff --git a/libs/queue/types.rs b/libs/queue/types.rs
index 43049b5..86d1bbb 100644
--- a/libs/queue/types.rs
+++ b/libs/queue/types.rs
@@ -11,6 +11,8 @@ pub struct RoomMessageEnvelope {
     pub room_id: Uuid,
     pub sender_type: String,
     pub sender_id: Option<Uuid>,
+    /// AI model ID — set when sender_type = "ai", used for display name lookups.
+    pub model_id: Option<Uuid>,
     pub thread_id: Option<Uuid>,
     pub in_reply_to: Option<Uuid>,
     pub content: String,
@@ -87,6 +89,8 @@ pub struct RoomMessageStreamChunkEvent {
     pub content: String,
     pub done: bool,
     pub error: Option<String>,
+    /// Human-readable AI model name (e.g. "Claude 3.5 Sonnet") for display.
+    pub display_name: Option<String>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]