diff --git a/android/app/src/main/java/com/thisux/droidclaw/model/AppState.kt b/android/app/src/main/java/com/thisux/droidclaw/model/AppState.kt
index bfa1001..d3360bc 100644
--- a/android/app/src/main/java/com/thisux/droidclaw/model/AppState.kt
+++ b/android/app/src/main/java/com/thisux/droidclaw/model/AppState.kt
@@ -28,3 +28,9 @@ data class GoalSession(
     val status: GoalStatus,
     val timestamp: Long = System.currentTimeMillis()
 )
+
+enum class OverlayMode {
+    Idle,
+    Listening,
+    Executing
+}
diff --git a/android/app/src/main/java/com/thisux/droidclaw/model/Protocol.kt b/android/app/src/main/java/com/thisux/droidclaw/model/Protocol.kt
index a68ecc6..1530cb3 100644
--- a/android/app/src/main/java/com/thisux/droidclaw/model/Protocol.kt
+++ b/android/app/src/main/java/com/thisux/droidclaw/model/Protocol.kt
@@ -76,6 +76,23 @@ data class StopGoalMessage(
     val type: String = "stop_goal"
 )
 
+@Serializable
+data class VoiceStartMessage(
+    val type: String = "voice_start"
+)
+
+@Serializable
+data class VoiceChunkMessage(
+    val type: String = "voice_chunk",
+    val data: String
+)
+
+@Serializable
+data class VoiceStopMessage(
+    val type: String = "voice_stop",
+    val action: String
+)
+
 @Serializable
 data class ServerMessage(
     val type: String,