diff --git a/app/schemas/com.m57.hermescontrol.data.local.HermesDatabase/8.json b/app/schemas/com.m57.hermescontrol.data.local.HermesDatabase/8.json
new file mode 100644
index 00000000..099208f0
--- /dev/null
+++ b/app/schemas/com.m57.hermescontrol.data.local.HermesDatabase/8.json
@@ -0,0 +1,115 @@
+{
+  "formatVersion": 1,
+  "database": {
+    "version": 8,
+    "identityHash": "4f44d92f9b8db2b02a1b156b37d64651",
+    "entities": [
+      {
+        "tableName": "chat_messages",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` TEXT NOT NULL, `session_id` TEXT NOT NULL, `role` TEXT NOT NULL, `content` TEXT NOT NULL, `reasoning_text` TEXT NOT NULL, `timestamp` INTEGER NOT NULL, `tool_name` TEXT, `tool_call_id` TEXT NOT NULL, `tool_status` TEXT, `is_streaming` INTEGER NOT NULL, `display_kind` TEXT, `token_count` INTEGER, `tps` REAL, `completion_id` TEXT, PRIMARY KEY(`id`))",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "sessionId",
+            "columnName": "session_id",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "role",
+            "columnName": "role",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "content",
+            "columnName": "content",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "reasoningText",
+            "columnName": "reasoning_text",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "timestamp",
+            "columnName": "timestamp",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "toolName",
+            "columnName": "tool_name",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "toolCallId",
+            "columnName": "tool_call_id",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "toolStatus",
+            "columnName": "tool_status",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "isStreaming",
+            "columnName": "is_streaming",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "displayKind",
+            "columnName": "display_kind",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "tokenCount",
+            "columnName": "token_count",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "tps",
+            "columnName": "tps",
+            "affinity": "REAL"
+          },
+          {
+            "fieldPath": "completionId",
+            "columnName": "completion_id",
+            "affinity": "TEXT"
+          }
+        ],
+        "primaryKey": {
+          "autoGenerate": false,
+          "columnNames": [
+            "id"
+          ]
+        },
+        "indices": [
+          {
+            "name": "index_chat_messages_session_id_timestamp",
+            "unique": false,
+            "columnNames": [
+              "session_id",
+              "timestamp"
+            ],
+            "orders": [],
+            "createSql": "CREATE INDEX IF NOT EXISTS `index_chat_messages_session_id_timestamp` ON `${TABLE_NAME}` (`session_id`, `timestamp`)"
+          }
+        ]
+      }
+    ],
+    "setupQueries": [
+      "CREATE TABLE IF NOT EXISTS room_master_table (id INTEGER PRIMARY KEY,identity_hash TEXT)",
+      "INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, '4f44d92f9b8db2b02a1b156b37d64651')"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/app/src/androidTest/java/com/m57/hermescontrol/ui/chat/ChatReadNotificationTest.kt b/app/src/androidTest/java/com/m57/hermescontrol/ui/chat/ChatReadNotificationTest.kt
new file mode 100644
index 00000000..946125fc
--- /dev/null
+++ b/app/src/androidTest/java/com/m57/hermescontrol/ui/chat/ChatReadNotificationTest.kt
@@ -0,0 +1,500 @@
+package com.m57.hermescontrol.ui.chat
+
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.content.Context
+import android.os.Build
+import android.os.Bundle
+import android.service.notification.StatusBarNotification
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.Text
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.test.junit4.createComposeRule
+import androidx.compose.ui.unit.dp
+import androidx.core.app.NotificationCompat
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.MediumTest
+import androidx.test.platform.app.InstrumentationRegistry
+import com.m57.hermescontrol.data.local.AuthManager
+import com.m57.hermescontrol.data.model.SessionMessage
+import com.m57.hermescontrol.data.ws.ConnectionStatus
+import com.m57.hermescontrol.notification.ChatNotificationService
+import com.m57.hermescontrol.notification.ReplyNotificationTracker
+import com.m57.hermescontrol.ui.chat.components.ChatLifecycleEffects
+import com.m57.hermescontrol.ui.chat.components.rememberChatScrollController
+import io.mockk.mockk
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.serialization.json.JsonPrimitive
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+@MediumTest
+class ChatReadNotificationTest {
+    @get:Rule
+    val composeTestRule = createComposeRule()
+
+    private lateinit var context: Context
+    private lateinit var notificationManager: NotificationManager
+    private val testChannelId = "test_chat_channel"
+
+    @Before
+    fun setUp() {
+        context = ApplicationProvider.getApplicationContext()
+        notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            InstrumentationRegistry
+                .getInstrumentation()
+                .uiAutomation
+                .grantRuntimePermission(
+                    context.packageName,
+                    android.Manifest.permission.POST_NOTIFICATIONS,
+                )
+        }
+        val channel =
+            NotificationChannel(
+                testChannelId,
+                "Test Chat Notifications",
+                NotificationManager.IMPORTANCE_HIGH,
+            )
+        notificationManager.createNotificationChannel(channel)
+        notificationManager.cancelAll()
+        ReplyNotificationTracker.resetForTest()
+    }
+
+    @After
+    fun tearDown() {
+        notificationManager.cancelAll()
+        ReplyNotificationTracker.resetForTest()
+    }
+
+    private fun awaitNotification(
+        timeoutMs: Long = 3000L,
+        predicate: (Array<StatusBarNotification>) -> Boolean,
+    ): Boolean {
+        val start = System.currentTimeMillis()
+        while (System.currentTimeMillis() - start < timeoutMs) {
+            if (predicate(notificationManager.activeNotifications)) return true
+            Thread.sleep(50)
+        }
+        return predicate(notificationManager.activeNotifications)
+    }
+
+    private fun postRealNotification(
+        kind: String,
+        scopeId: String = "default",
+        sessionId: String = "session-1",
+        completionId: String = "comp-1",
+        textSnippet: String = "Here is the reply",
+        serverMessageId: Int? = null,
+    ): Long {
+        val gen =
+            if (kind == ReplyNotificationTracker.KIND_REPLY) {
+                ReplyNotificationTracker.registerPendingReply(
+                    scopeId = scopeId,
+                    sessionId = sessionId,
+                    completionId = completionId,
+                    textSnippet = textSnippet,
+                )
+            } else {
+                ReplyNotificationTracker.nextGeneration()
+            }
+
+        val notification =
+            NotificationCompat
+                .Builder(context, testChannelId)
+                .setSmallIcon(android.R.drawable.ic_dialog_info)
+                .setContentTitle("Agent")
+                .setContentText(textSnippet)
+                .addExtras(
+                    Bundle().apply {
+                        putString(ReplyNotificationTracker.EXTRA_NOTIF_KIND, kind)
+                        putString(ReplyNotificationTracker.EXTRA_SCOPE_ID, scopeId)
+                        putString(ReplyNotificationTracker.EXTRA_SESSION_ID, sessionId)
+                        putString(ReplyNotificationTracker.EXTRA_COMPLETION_ID, completionId)
+                        putString(ReplyNotificationTracker.EXTRA_TEXT_SNIPPET, textSnippet)
+                        putLong(ReplyNotificationTracker.EXTRA_GENERATION, gen)
+                        serverMessageId?.let {
+                            putInt(ReplyNotificationTracker.EXTRA_SERVER_MESSAGE_ID, it)
+                        }
+                    },
+                ).build()
+
+        when (kind) {
+            ReplyNotificationTracker.KIND_REPLY -> {
+                ReplyNotificationTracker.postReplyNotification(context, notification, gen)
+            }
+
+            ReplyNotificationTracker.KIND_ACTION -> {
+                ReplyNotificationTracker.postActionNotification(context, notification)
+            }
+
+            ReplyNotificationTracker.KIND_REPLIED -> {
+                ReplyNotificationTracker.postRepliedNotification(context, notification)
+            }
+        }
+
+        val active = awaitNotification { sbns -> sbns.any { it.id == ChatNotificationService.PENDING_NOTIFICATION_ID } }
+        assertTrue("Notification ID 2 must be active in system after posting", active)
+        return gen
+    }
+
+    @Test
+    fun chatLifecycleEffects_dismissesRealSystemNotification_whenAssistantMessageDisplayed() {
+        val sessionId = "session-read-test"
+        val completionId = "comp-12345"
+        val replyText = "Here is the completed response."
+
+        postRealNotification(
+            kind = ReplyNotificationTracker.KIND_REPLY,
+            scopeId = AuthManager.activeProfileId.value.orEmpty(),
+            sessionId = sessionId,
+            completionId = completionId,
+            textSnippet = replyText,
+        )
+
+        val assistantMessage =
+            ChatMessage(
+                id = "msg-1",
+                role = MessageRole.ASSISTANT,
+                content = replyText,
+                completionId = completionId,
+            )
+        val messages = listOf(assistantMessage)
+        val mockVm = mockk<ChatViewModel>(relaxed = true)
+
+        composeTestRule.setContent {
+            val listState = rememberLazyListState()
+            val scrollScope = remember { CoroutineScope(Dispatchers.Main) }
+            val scrollController = rememberChatScrollController(listState, scrollScope)
+            val snackbarHostState = remember { SnackbarHostState() }
+
+            LazyColumn(
+                state = listState,
+                modifier = Modifier.size(300.dp, 600.dp),
+            ) {
+                items(messages, key = { "prose-${it.id}" }) {
+                    Text(it.content)
+                }
+            }
+
+            ChatLifecycleEffects(
+                sessionId = sessionId,
+                connectionStatus = ConnectionStatus.CONNECTED,
+                currentSessionId = sessionId,
+                messages = messages,
+                errorMessage = null,
+                backgroundCompleteMessage = null,
+                openError = null,
+                clarifyRequest = null,
+                sudoPrompt = null,
+                secretPrompt = null,
+                listState = listState,
+                scrollController = scrollController,
+                snackbarHostState = snackbarHostState,
+                viewModel = mockVm,
+            )
+        }
+
+        composeTestRule.waitForIdle()
+
+        val dismissed =
+            awaitNotification { sbns -> sbns.none { it.id == ChatNotificationService.PENDING_NOTIFICATION_ID } }
+        assertTrue(
+            "Notification ID 2 must be dismissed from real system notifications when message is viewed",
+            dismissed,
+        )
+    }
+
+    /**
+     * The mobile-produced durable row id must survive in the real posted
+     * notification; after a process death it is the only thing that can name the
+     * row whose visibility dismisses this notification.
+     */
+    @Test
+    fun serverRowIdSurvivesProcessDeathThroughRealNotificationExtras() {
+        val sessionId = "session-exact-row-test"
+        val replyText = "Done"
+
+        postRealNotification(
+            kind = ReplyNotificationTracker.KIND_REPLY,
+            scopeId = AuthManager.activeProfileId.value.orEmpty(),
+            sessionId = sessionId,
+            completionId = "comp-exact-row",
+            textSnippet = replyText,
+            serverMessageId = 52,
+        )
+
+        // Simulate process death: nothing in memory, only the posted extras.
+        ReplyNotificationTracker.resetForTest()
+        val recovered = ReplyNotificationTracker.getActiveTarget(context)
+        assertEquals(
+            "Recovered target must carry the durable row id from the notification extras",
+            52,
+            recovered?.serverMessageId,
+        )
+
+        val history =
+            listOf(
+                SessionMessage(id = 10, role = "assistant", content = JsonPrimitive("Done")),
+                SessionMessage(id = 52, role = "assistant", content = JsonPrimitive("Done")),
+            )
+        val messages = mapServerMessages(sessionId, history, 0, true, emptyList(), context = context)
+        assertEquals("Older duplicate must stay unmapped", null, messages[0].completionId)
+        assertEquals("Exact row must receive the completion id", "comp-exact-row", messages[1].completionId)
+
+        val mockVm = mockk<ChatViewModel>(relaxed = true)
+        composeTestRule.setContent {
+            val listState = rememberLazyListState()
+            val scrollScope = remember { CoroutineScope(Dispatchers.Main) }
+            val scrollController = rememberChatScrollController(listState, scrollScope)
+            val snackbarHostState = remember { SnackbarHostState() }
+
+            LazyColumn(
+                state = listState,
+                modifier = Modifier.size(300.dp, 600.dp),
+            ) {
+                items(messages, key = { "prose-${it.id}" }) {
+                    Text(it.content)
+                }
+            }
+
+            ChatLifecycleEffects(
+                sessionId = sessionId,
+                connectionStatus = ConnectionStatus.CONNECTED,
+                currentSessionId = sessionId,
+                messages = messages,
+                errorMessage = null,
+                backgroundCompleteMessage = null,
+                openError = null,
+                clarifyRequest = null,
+                sudoPrompt = null,
+                secretPrompt = null,
+                listState = listState,
+                scrollController = scrollController,
+                snackbarHostState = snackbarHostState,
+                viewModel = mockVm,
+            )
+        }
+
+        composeTestRule.waitForIdle()
+
+        val dismissed =
+            awaitNotification { sbns -> sbns.none { it.id == ChatNotificationService.PENDING_NOTIFICATION_ID } }
+        assertTrue(
+            "Viewing the exact hydrated row must dismiss the real system notification",
+            dismissed,
+        )
+    }
+
+    @Test
+    fun chatLifecycleEffects_doesNotDismissRealSystemNotification_forActionRequest() {
+        val sessionId = "session-action-test"
+        val completionId = "comp-action"
+        val promptText = "Approval required"
+
+        postRealNotification(
+            kind = ReplyNotificationTracker.KIND_ACTION,
+            scopeId = AuthManager.activeProfileId.value.orEmpty(),
+            sessionId = sessionId,
+            completionId = completionId,
+            textSnippet = promptText,
+        )
+
+        val assistantMessage =
+            ChatMessage(
+                id = "msg-1",
+                role = MessageRole.ASSISTANT,
+                content = promptText,
+                completionId = completionId,
+            )
+        val messages = listOf(assistantMessage)
+        val mockVm = mockk<ChatViewModel>(relaxed = true)
+
+        composeTestRule.setContent {
+            val listState = rememberLazyListState()
+            val scrollScope = remember { CoroutineScope(Dispatchers.Main) }
+            val scrollController = rememberChatScrollController(listState, scrollScope)
+            val snackbarHostState = remember { SnackbarHostState() }
+
+            LazyColumn(
+                state = listState,
+                modifier = Modifier.size(300.dp, 600.dp),
+            ) {
+                items(messages, key = { "prose-${it.id}" }) {
+                    Text(it.content)
+                }
+            }
+
+            ChatLifecycleEffects(
+                sessionId = sessionId,
+                connectionStatus = ConnectionStatus.CONNECTED,
+                currentSessionId = sessionId,
+                messages = messages,
+                errorMessage = null,
+                backgroundCompleteMessage = null,
+                openError = null,
+                clarifyRequest = null,
+                sudoPrompt = null,
+                secretPrompt = null,
+                listState = listState,
+                scrollController = scrollController,
+                snackbarHostState = snackbarHostState,
+                viewModel = mockVm,
+            )
+        }
+
+        composeTestRule.waitForIdle()
+        Thread.sleep(200)
+
+        assertTrue(
+            "Action notifications must NOT be auto-dismissed when viewing chat",
+            notificationManager.activeNotifications.any { it.id == ChatNotificationService.PENDING_NOTIFICATION_ID },
+        )
+    }
+
+    @Test
+    fun chatLifecycleEffects_doesNotDismissRealSystemNotification_forRepliedNotification() {
+        val sessionId = "session-replied-test"
+        val completionId = "comp-replied"
+        val replyStatusText = "Replied: done"
+
+        postRealNotification(
+            kind = ReplyNotificationTracker.KIND_REPLIED,
+            scopeId = AuthManager.activeProfileId.value.orEmpty(),
+            sessionId = sessionId,
+            completionId = completionId,
+            textSnippet = replyStatusText,
+        )
+
+        val assistantMessage =
+            ChatMessage(
+                id = "msg-1",
+                role = MessageRole.ASSISTANT,
+                content = replyStatusText,
+                completionId = completionId,
+            )
+        val messages = listOf(assistantMessage)
+        val mockVm = mockk<ChatViewModel>(relaxed = true)
+
+        composeTestRule.setContent {
+            val listState = rememberLazyListState()
+            val scrollScope = remember { CoroutineScope(Dispatchers.Main) }
+            val scrollController = rememberChatScrollController(listState, scrollScope)
+            val snackbarHostState = remember { SnackbarHostState() }
+
+            LazyColumn(
+                state = listState,
+                modifier = Modifier.size(300.dp, 600.dp),
+            ) {
+                items(messages, key = { "prose-${it.id}" }) {
+                    Text(it.content)
+                }
+            }
+
+            ChatLifecycleEffects(
+                sessionId = sessionId,
+                connectionStatus = ConnectionStatus.CONNECTED,
+                currentSessionId = sessionId,
+                messages = messages,
+                errorMessage = null,
+                backgroundCompleteMessage = null,
+                openError = null,
+                clarifyRequest = null,
+                sudoPrompt = null,
+                secretPrompt = null,
+                listState = listState,
+                scrollController = scrollController,
+                snackbarHostState = snackbarHostState,
+                viewModel = mockVm,
+            )
+        }
+
+        composeTestRule.waitForIdle()
+        Thread.sleep(200)
+
+        assertTrue(
+            "Replied status notifications must NOT be auto-dismissed when viewing chat",
+            notificationManager.activeNotifications.any { it.id == ChatNotificationService.PENDING_NOTIFICATION_ID },
+        )
+    }
+
+    @Test
+    fun chatLifecycleEffects_doesNotDismissNotification_forDifferentSession() {
+        val sessionIdWithNotif = "session-with-notif"
+        val differentSessionId = "other-session"
+        val completionId = "comp-12345"
+        val replyText = "Here is the completed response."
+
+        postRealNotification(
+            kind = ReplyNotificationTracker.KIND_REPLY,
+            scopeId = AuthManager.activeProfileId.value.orEmpty(),
+            sessionId = sessionIdWithNotif,
+            completionId = completionId,
+            textSnippet = replyText,
+        )
+
+        val assistantMessage =
+            ChatMessage(
+                id = "msg-1",
+                role = MessageRole.ASSISTANT,
+                content = replyText,
+                completionId = completionId,
+            )
+        val messages = listOf(assistantMessage)
+        val mockVm = mockk<ChatViewModel>(relaxed = true)
+
+        composeTestRule.setContent {
+            val listState = rememberLazyListState()
+            val scrollScope = remember { CoroutineScope(Dispatchers.Main) }
+            val scrollController = rememberChatScrollController(listState, scrollScope)
+            val snackbarHostState = remember { SnackbarHostState() }
+
+            LazyColumn(
+                state = listState,
+                modifier = Modifier.size(300.dp, 600.dp),
+            ) {
+                items(messages, key = { "prose-${it.id}" }) {
+                    Text(it.content)
+                }
+            }
+
+            ChatLifecycleEffects(
+                sessionId = differentSessionId,
+                connectionStatus = ConnectionStatus.CONNECTED,
+                currentSessionId = differentSessionId,
+                messages = messages,
+                errorMessage = null,
+                backgroundCompleteMessage = null,
+                openError = null,
+                clarifyRequest = null,
+                sudoPrompt = null,
+                secretPrompt = null,
+                listState = listState,
+                scrollController = scrollController,
+                snackbarHostState = snackbarHostState,
+                viewModel = mockVm,
+            )
+        }
+
+        composeTestRule.waitForIdle()
+        Thread.sleep(200)
+
+        assertTrue(
+            "Notification ID 2 must remain active for a different session",
+            notificationManager.activeNotifications.any { it.id == ChatNotificationService.PENDING_NOTIFICATION_ID },
+        )
+    }
+}
diff --git a/app/src/main/java/com/m57/hermescontrol/HermesControlApp.kt b/app/src/main/java/com/m57/hermescontrol/HermesControlApp.kt
index 2289e292..5e75e555 100644
--- a/app/src/main/java/com/m57/hermescontrol/HermesControlApp.kt
+++ b/app/src/main/java/com/m57/hermescontrol/HermesControlApp.kt
@@ -14,6 +14,7 @@ import com.m57.hermescontrol.data.local.SessionListCacheStore
 import com.m57.hermescontrol.data.remote.NetworkMonitor
 import com.m57.hermescontrol.data.remote.OkHttpProvider
 import com.m57.hermescontrol.data.update.UpdateNoticeManager
+import com.m57.hermescontrol.notification.TurnCorrelationTracker
 import com.m57.hermescontrol.ui.analytics.AnalyticsPreloader
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -31,6 +32,9 @@ class HermesControlApp :
         AuthManager.init(this)
         NetworkMonitor.init(this)
         SessionListCacheStore.init(this)
+        // Reply-notification turn boundaries survive process death (armed before
+        // each mobile prompt, consumed by the matching completion).
+        TurnCorrelationTracker.attach(this)
         appScope.launch {
             AuthManager.initializationState.first { it == AuthManager.InitializationState.Ready }
             // Issue #537 follow-up (A): preload analytics in the background after launch
diff --git a/app/src/main/java/com/m57/hermescontrol/data/local/ChatMessageEntity.kt b/app/src/main/java/com/m57/hermescontrol/data/local/ChatMessageEntity.kt
index 548e45b5..3a4d6f18 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/local/ChatMessageEntity.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/local/ChatMessageEntity.kt
@@ -46,4 +46,6 @@ data class ChatMessageEntity(
     val tokenCount: Int? = null,
     @ColumnInfo(name = "tps")
     val tps: Double? = null,
+    @ColumnInfo(name = "completion_id")
+    val completionId: String? = null,
 )
diff --git a/app/src/main/java/com/m57/hermescontrol/data/local/ChatMessageMapper.kt b/app/src/main/java/com/m57/hermescontrol/data/local/ChatMessageMapper.kt
index 2600557b..953c093d 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/local/ChatMessageMapper.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/local/ChatMessageMapper.kt
@@ -37,6 +37,7 @@ fun ChatMessageEntity.toUiModel(): ChatMessage =
         displayKind = displayKind,
         tokenCount = tokenCount,
         tps = tps,
+        completionId = completionId,
     )
 
 fun ChatMessage.toEntity(sessionId: String): ChatMessageEntity =
@@ -54,4 +55,5 @@ fun ChatMessage.toEntity(sessionId: String): ChatMessageEntity =
         displayKind = displayKind,
         tokenCount = tokenCount,
         tps = tps,
+        completionId = completionId,
     )
diff --git a/app/src/main/java/com/m57/hermescontrol/data/local/HermesDatabase.kt b/app/src/main/java/com/m57/hermescontrol/data/local/HermesDatabase.kt
index 16741b0d..f3525f14 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/local/HermesDatabase.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/local/HermesDatabase.kt
@@ -14,7 +14,7 @@ import java.io.File
 
 @Database(
     entities = [ChatMessageEntity::class],
-    version = 7,
+    version = 8,
     exportSchema = true,
 )
 abstract class HermesDatabase : RoomDatabase() {
@@ -81,6 +81,15 @@ abstract class HermesDatabase : RoomDatabase() {
                 }
             }
 
+        val MIGRATION_7_8: Migration =
+            object : Migration(7, 8) {
+                override suspend fun migrate(connection: SQLiteConnection) {
+                    connection.execSQL(
+                        "ALTER TABLE `chat_messages` ADD COLUMN `completion_id` TEXT",
+                    )
+                }
+            }
+
         suspend fun get(context: Context): HermesDatabase =
             withContext(Dispatchers.IO) {
                 instance?.let { return@withContext it }
@@ -116,6 +125,7 @@ abstract class HermesDatabase : RoomDatabase() {
                             MIGRATION_4_5,
                             MIGRATION_5_6,
                             MIGRATION_6_7,
+                            MIGRATION_7_8,
                         ).fallbackToDestructiveMigration(false)
                         .build()
                         .also { instance = it }
diff --git a/app/src/main/java/com/m57/hermescontrol/data/ws/EventParser.kt b/app/src/main/java/com/m57/hermescontrol/data/ws/EventParser.kt
index 14c064ce..bbad8a29 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/ws/EventParser.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/ws/EventParser.kt
@@ -110,7 +110,18 @@ object EventParser {
             "message.complete" -> {
                 val text = payload?.get("text") as? String ?: ""
                 val reasoning = payload?.get("reasoning") as? String
-                WsEvent.MessageComplete(text, sessionId, reasoning, rawPayload = payload)
+                val completionId =
+                    payload?.get("completion_id") as? String
+                        ?: java.util.UUID
+                            .randomUUID()
+                            .toString()
+                WsEvent.MessageComplete(
+                    text,
+                    sessionId,
+                    reasoning,
+                    rawPayload = payload,
+                    completionId = completionId,
+                )
             }
 
             "message.done" -> {
diff --git a/app/src/main/java/com/m57/hermescontrol/data/ws/WsEvent.kt b/app/src/main/java/com/m57/hermescontrol/data/ws/WsEvent.kt
index cea239f9..712d4bd5 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/ws/WsEvent.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/ws/WsEvent.kt
@@ -63,6 +63,11 @@ sealed class WsEvent {
         val storedSessionId: String? = null,
         /** Full raw payload map (including usage/avg_tps) emitted with message.complete. */
         val rawPayload: Map<String, Any?>? = null,
+        /** Stable completion identity for notification and read-tracking correlation. */
+        val completionId: String =
+            java.util.UUID
+                .randomUUID()
+                .toString(),
     ) : WsEvent()
 
     data class MessageDone(
diff --git a/app/src/main/java/com/m57/hermescontrol/notification/ChatNotificationService.kt b/app/src/main/java/com/m57/hermescontrol/notification/ChatNotificationService.kt
index 1feba748..831aa535 100644
--- a/app/src/main/java/com/m57/hermescontrol/notification/ChatNotificationService.kt
+++ b/app/src/main/java/com/m57/hermescontrol/notification/ChatNotificationService.kt
@@ -13,7 +13,6 @@ import androidx.core.app.NotificationCompat
 import androidx.core.app.RemoteInput
 import com.m57.hermescontrol.MainActivity
 import com.m57.hermescontrol.R
-import com.m57.hermescontrol.data.local.AuthManager
 import com.m57.hermescontrol.data.remote.NetworkMonitor
 import com.m57.hermescontrol.data.session.ActiveSessionHolder
 import com.m57.hermescontrol.data.ws.HermesWsClient
@@ -69,6 +68,12 @@ class ChatNotificationService : Service() {
         private val isAppInForeground = AtomicBoolean(false)
         internal val lifecycle = ForegroundServiceLifecycle()
 
+        /**
+         * Turn-row correlation used when a reply completes in the background.
+         * Injectable so the resolution path can be exercised without REST.
+         */
+        internal var turnRowResolver: TurnRowResolver = defaultTurnRowResolver
+
         @Volatile
         internal var activeServiceInstance: ChatNotificationService? = null
 
@@ -111,10 +116,23 @@ class ChatNotificationService : Service() {
                                                 .take(100)
                                                 .replace("\n", " ")
                                                 .ifBlank { getString(R.string.notif_new_message) }
-                                        showReplyNotification(
-                                            preview,
+                                        val targetSessionId =
                                             event.storedSessionId
-                                                ?: ActiveSessionHolder.resolveStoredSessionId(event.sessionId),
+                                                ?: ActiveSessionHolder.resolveStoredSessionId(event.sessionId)
+                                        showReplyNotification(
+                                            text = preview,
+                                            sessionId = targetSessionId,
+                                            isReplyMessage = true,
+                                            completionId = event.completionId,
+                                            // The durable REST row for this turn, when the
+                                            // boundary armed before the prompt was submitted
+                                            // still lets us name it unambiguously. Null is a
+                                            // normal, safe outcome: the notification is then
+                                            // never auto-dismissed from REST hydration, which
+                                            // is strictly better than dismissing the wrong
+                                            // duplicate reply.
+                                            serverMessageId =
+                                                coalesceTurnRow(targetSessionId, event.text),
                                         )
                                         // The wait is over — retire the foreground
                                         // service. The reply notification above
@@ -167,9 +185,37 @@ class ChatNotificationService : Service() {
             }
     }
 
+    /**
+     * Names the exact REST row this completion produced, using the turn
+     * boundary armed before the prompt was submitted. Any failure to prove that
+     * identity returns null — the notification is still posted, it just will not
+     * be auto-dismissed from REST hydration.
+     */
+    private suspend fun coalesceTurnRow(
+        sessionId: String?,
+        completionText: String,
+    ): Int? {
+        if (sessionId.isNullOrBlank()) return null
+        return try {
+            correlateCompletedTurnRow(
+                scopeId = correlationScopeId(),
+                sessionId = sessionId,
+                completionText = completionText,
+                resolver = turnRowResolver,
+            )
+        } catch (e: kotlinx.coroutines.CancellationException) {
+            throw e
+        } catch (e: Exception) {
+            null
+        }
+    }
+
     private fun showReplyNotification(
         text: String,
         sessionId: String?,
+        isReplyMessage: Boolean = false,
+        completionId: String? = null,
+        serverMessageId: Int? = null,
     ) {
         val builder =
             NotificationCompat
@@ -183,6 +229,39 @@ class ChatNotificationService : Service() {
                 .setAutoCancel(true)
                 .setContentIntent(buildContentIntent(sessionId))
 
+        var replyGeneration: Long? = null
+        if (isReplyMessage && !sessionId.isNullOrBlank() && !completionId.isNullOrBlank()) {
+            val scopeId = correlationScopeId()
+            val generation =
+                ReplyNotificationTracker.registerPendingReply(
+                    scopeId = scopeId,
+                    sessionId = sessionId,
+                    completionId = completionId,
+                    textSnippet = text,
+                    serverMessageId = serverMessageId,
+                )
+            replyGeneration = generation
+            builder.addExtras(
+                android.os.Bundle().apply {
+                    putString(ReplyNotificationTracker.EXTRA_NOTIF_KIND, ReplyNotificationTracker.KIND_REPLY)
+                    putString(ReplyNotificationTracker.EXTRA_SCOPE_ID, scopeId)
+                    putString(ReplyNotificationTracker.EXTRA_SESSION_ID, sessionId)
+                    putString(ReplyNotificationTracker.EXTRA_COMPLETION_ID, completionId)
+                    putString(ReplyNotificationTracker.EXTRA_TEXT_SNIPPET, text)
+                    putLong(ReplyNotificationTracker.EXTRA_GENERATION, generation)
+                    serverMessageId?.let {
+                        putInt(ReplyNotificationTracker.EXTRA_SERVER_MESSAGE_ID, it)
+                    }
+                },
+            )
+        } else {
+            builder.addExtras(
+                android.os.Bundle().apply {
+                    putString(ReplyNotificationTracker.EXTRA_NOTIF_KIND, ReplyNotificationTracker.KIND_ACTION)
+                },
+            )
+        }
+
         if (!sessionId.isNullOrBlank()) {
             val replyLabel = getString(R.string.notif_reply_placeholder)
             val remoteInput =
@@ -194,6 +273,11 @@ class ChatNotificationService : Service() {
             val replyIntent =
                 Intent(this, NotificationReplyReceiver::class.java).apply {
                     action = "$packageName.ACTION_NOTIFICATION_REPLY"
+                    component =
+                        android.content.ComponentName(
+                            this@ChatNotificationService,
+                            NotificationReplyReceiver::class.java,
+                        )
                     setPackage(packageName)
                     putExtra(NotificationReplyReceiver.EXTRA_SESSION_ID, sessionId)
                 }
@@ -218,19 +302,32 @@ class ChatNotificationService : Service() {
             builder.addAction(action)
         }
 
-        val manager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
-        manager.notify(PENDING_NOTIFICATION_ID, builder.build())
+        val notification = builder.build()
+        if (replyGeneration != null) {
+            ReplyNotificationTracker.postReplyNotification(
+                context = this,
+                notification = notification,
+                generation = replyGeneration,
+            )
+        } else {
+            ReplyNotificationTracker.postActionNotification(
+                context = this,
+                notification = notification,
+            )
+        }
     }
 
     private fun buildContentIntent(sessionId: String?): PendingIntent {
         val intent =
             Intent(this, MainActivity::class.java).apply {
                 action = MainActivity.ACTION_OPEN_CHAT_FROM_NOTIFICATION
+                component = android.content.ComponentName(this@ChatNotificationService, MainActivity::class.java)
+                setPackage(packageName)
                 flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP
+                if (!sessionId.isNullOrBlank()) {
+                    putExtra(NotificationReplyReceiver.EXTRA_SESSION_ID, sessionId)
+                }
             }
-        if (!sessionId.isNullOrBlank()) {
-            intent.putExtra(NotificationReplyReceiver.EXTRA_SESSION_ID, sessionId)
-        }
         return PendingIntent.getActivity(
             this,
             sessionId?.hashCode() ?: 0,
diff --git a/app/src/main/java/com/m57/hermescontrol/notification/NotificationReplyReceiver.kt b/app/src/main/java/com/m57/hermescontrol/notification/NotificationReplyReceiver.kt
index dde82529..b776b055 100644
--- a/app/src/main/java/com/m57/hermescontrol/notification/NotificationReplyReceiver.kt
+++ b/app/src/main/java/com/m57/hermescontrol/notification/NotificationReplyReceiver.kt
@@ -24,6 +24,13 @@ open class NotificationReplyReceiver : BroadcastReceiver() {
         const val KEY_TEXT_REPLY = "key_text_reply"
         const val EXTRA_SESSION_ID = "extra_session_id"
         private const val REPLY_TIMEOUT_MS = 5_000L
+
+        /**
+         * Turn-boundary read budget inside the reply deadline. Deliberately tight:
+         * the probe sits on the reply path, so a slow or unreachable gateway must
+         * cost the user's reply only a sliver of its 5s deadline.
+         */
+        private const val BOUNDARY_TIMEOUT_MS = 250L
     }
 
     // Reusable scope for async reply processing — avoids creating a new
@@ -50,7 +57,11 @@ open class NotificationReplyReceiver : BroadcastReceiver() {
             .setContentText("Replied")
             .setPriority(NotificationCompat.PRIORITY_HIGH)
             .setAutoCancel(true)
-            .build()
+            .addExtras(
+                android.os.Bundle().apply {
+                    putString(ReplyNotificationTracker.EXTRA_NOTIF_KIND, ReplyNotificationTracker.KIND_REPLIED)
+                },
+            ).build()
 
     override fun onReceive(
         context: Context,
@@ -78,6 +89,17 @@ open class NotificationReplyReceiver : BroadcastReceiver() {
                                 return@withContext
                             }
 
+                            // Mobile-originated follow-up turn: arm its durable
+                            // boundary BEFORE prompt.submit. Budgeted tighter
+                            // than the chat composer's — this receiver has its
+                            // own 5s deadline and a failed capture must only
+                            // make the reply uncorrelatable, never lose it.
+                            captureTurnBoundary(
+                                scopeId = correlationScopeId(),
+                                sessionId = sessionId,
+                                timeoutMs = BOUNDARY_TIMEOUT_MS,
+                            )
+
                             val runtimeSessionId =
                                 ActiveSessionHolder.resolveRuntimeSessionId(sessionId)
                                     ?: resumeSession(sessionId)
@@ -102,8 +124,7 @@ open class NotificationReplyReceiver : BroadcastReceiver() {
                             dao.upsert(entity)
 
                             val repliedNotification = buildReplyNotification(context)
-                            val manager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
-                            manager.notify(ChatNotificationService.PENDING_NOTIFICATION_ID, repliedNotification)
+                            ReplyNotificationTracker.postRepliedNotification(context, repliedNotification)
 
                             // The follow-up turn is now pending — keep the
                             // foreground service alive if it retired after the
diff --git a/app/src/main/java/com/m57/hermescontrol/notification/ReplyNotificationTracker.kt b/app/src/main/java/com/m57/hermescontrol/notification/ReplyNotificationTracker.kt
new file mode 100644
index 00000000..b6009916
--- /dev/null
+++ b/app/src/main/java/com/m57/hermescontrol/notification/ReplyNotificationTracker.kt
@@ -0,0 +1,302 @@
+package com.m57.hermescontrol.notification
+
+import android.app.Notification
+import android.app.NotificationManager
+import android.content.Context
+import androidx.annotation.VisibleForTesting
+import java.util.concurrent.atomic.AtomicLong
+
+data class ReplyNotificationTarget(
+    val scopeId: String,
+    val sessionId: String,
+    val completionId: String,
+    val generation: Long,
+    val textSnippet: String = "",
+    val timestamp: Long = System.currentTimeMillis(),
+    /**
+     * Durable REST `messages.id` of the row this reply produced. Resolved by
+     * [TurnCorrelationTracker] from the boundary armed before the prompt was
+     * submitted — never taken from the completion event, text, or a clock. Null
+     * means the turn could not be correlated, and then hydration must not touch
+     * this notification at all (fail closed).
+     */
+    val serverMessageId: Int? = null,
+) {
+    fun matches(
+        candidateScopeId: String?,
+        candidateSessionId: String?,
+        candidateCompletionId: String?,
+    ): Boolean {
+        if (scopeId.isNotBlank() && scopeId != candidateScopeId) {
+            return false
+        }
+        if (candidateSessionId.isNullOrBlank() || sessionId != candidateSessionId) {
+            return false
+        }
+        if (candidateCompletionId.isNullOrBlank() || completionId.isBlank()) {
+            return false
+        }
+        return candidateCompletionId == completionId
+    }
+}
+
+internal data class ActiveReplyInfo(
+    val id: Int,
+    val kind: String?,
+    val scopeId: String?,
+    val sessionId: String?,
+    val completionId: String?,
+    val textSnippet: String?,
+    val generation: Long,
+    val timestamp: Long,
+    val serverMessageId: Int? = null,
+)
+
+object ReplyNotificationTracker {
+    const val EXTRA_NOTIF_KIND = "hermes_notif_kind"
+    const val EXTRA_SCOPE_ID = "hermes_scope_id"
+    const val EXTRA_SESSION_ID = "hermes_session_id"
+    const val EXTRA_COMPLETION_ID = "hermes_completion_id"
+    const val EXTRA_TEXT_SNIPPET = "hermes_text_snippet"
+    const val EXTRA_GENERATION = "hermes_generation"
+    const val EXTRA_SERVER_MESSAGE_ID = "hermes_server_message_id"
+
+    const val KIND_REPLY = "reply"
+    const val KIND_ACTION = "action"
+    const val KIND_REPLIED = "replied"
+
+    private val generationCounter = AtomicLong(0L)
+    private val tombstoneGeneration = AtomicLong(0L)
+
+    @Volatile
+    private var activeTarget: ReplyNotificationTarget? = null
+
+    private val defaultActiveNotificationProvider: (Context) -> ActiveReplyInfo? = { context ->
+        runCatching {
+            val manager =
+                context.getSystemService(Context.NOTIFICATION_SERVICE) as? NotificationManager
+            val sbn =
+                manager?.activeNotifications?.firstOrNull {
+                    it.id == ChatNotificationService.PENDING_NOTIFICATION_ID
+                }
+            if (sbn != null) {
+                val extras = sbn.notification?.extras
+                ActiveReplyInfo(
+                    id = sbn.id,
+                    kind = extras?.getString(EXTRA_NOTIF_KIND),
+                    scopeId = extras?.getString(EXTRA_SCOPE_ID),
+                    sessionId = extras?.getString(EXTRA_SESSION_ID),
+                    completionId = extras?.getString(EXTRA_COMPLETION_ID),
+                    textSnippet = extras?.getString(EXTRA_TEXT_SNIPPET),
+                    generation = extras?.getLong(EXTRA_GENERATION, 0L) ?: 0L,
+                    timestamp = sbn.postTime,
+                    serverMessageId = extras?.getInt(EXTRA_SERVER_MESSAGE_ID, -1)?.takeIf { it >= 0 },
+                )
+            } else {
+                null
+            }
+        }.getOrNull()
+    }
+
+    internal var activeNotificationProvider: (Context) -> ActiveReplyInfo? = defaultActiveNotificationProvider
+
+    fun nextGeneration(): Long {
+        val floor = maxOf(generationCounter.get(), tombstoneGeneration.get())
+        return generationCounter.updateAndGet { maxOf(it, floor) + 1 }
+    }
+
+    @Synchronized
+    fun registerPendingReply(
+        scopeId: String,
+        sessionId: String,
+        completionId: String,
+        textSnippet: String,
+        timestamp: Long = System.currentTimeMillis(),
+        serverMessageId: Int? = null,
+    ): Long {
+        val generation = nextGeneration()
+        activeTarget =
+            ReplyNotificationTarget(
+                scopeId = scopeId,
+                sessionId = sessionId,
+                completionId = completionId,
+                generation = generation,
+                textSnippet = textSnippet,
+                timestamp = timestamp,
+                serverMessageId = serverMessageId,
+            )
+        return generation
+    }
+
+    @Synchronized
+    fun postReplyNotification(
+        context: Context,
+        notification: Notification,
+        generation: Long,
+    ): Boolean {
+        if (generation <= tombstoneGeneration.get()) {
+            return false
+        }
+        val current = activeTarget
+        if (current != null && current.generation > generation) {
+            return false
+        }
+        val manager =
+            context.getSystemService(Context.NOTIFICATION_SERVICE) as? NotificationManager
+                ?: return false
+        manager.notify(ChatNotificationService.PENDING_NOTIFICATION_ID, notification)
+        return true
+    }
+
+    @Synchronized
+    fun postActionNotification(
+        context: Context,
+        notification: Notification,
+    ): Boolean {
+        val nextGen = nextGeneration()
+        tombstoneGeneration.updateAndGet { maxOf(it, nextGen) }
+        activeTarget = null
+        val manager =
+            context.getSystemService(Context.NOTIFICATION_SERVICE) as? NotificationManager
+                ?: return false
+        manager.notify(ChatNotificationService.PENDING_NOTIFICATION_ID, notification)
+        return true
+    }
+
+    @Synchronized
+    fun postRepliedNotification(
+        context: Context,
+        notification: Notification,
+    ): Boolean {
+        val nextGen = nextGeneration()
+        tombstoneGeneration.updateAndGet { maxOf(it, nextGen) }
+        activeTarget = null
+        val manager =
+            context.getSystemService(Context.NOTIFICATION_SERVICE) as? NotificationManager
+                ?: return false
+        manager.notify(ChatNotificationService.PENDING_NOTIFICATION_ID, notification)
+        return true
+    }
+
+    @Synchronized
+    fun onReplyNotificationPosted(
+        scopeId: String,
+        sessionId: String,
+        completionId: String,
+        textSnippet: String,
+        generation: Long,
+        timestamp: Long = System.currentTimeMillis(),
+        serverMessageId: Int? = null,
+    ) {
+        if (generation <= tombstoneGeneration.get()) return
+        generationCounter.updateAndGet { maxOf(it, generation) }
+        activeTarget =
+            ReplyNotificationTarget(
+                scopeId = scopeId,
+                sessionId = sessionId,
+                completionId = completionId,
+                generation = generation,
+                textSnippet = textSnippet,
+                timestamp = timestamp,
+                serverMessageId = serverMessageId,
+            )
+    }
+
+    @Synchronized
+    fun onNonReplyNotificationPosted() {
+        val nextGen = nextGeneration()
+        tombstoneGeneration.updateAndGet { maxOf(it, nextGen) }
+        activeTarget = null
+    }
+
+    @Synchronized
+    fun getActiveTarget(context: Context? = null): ReplyNotificationTarget? {
+        val inMemory = activeTarget
+        if (inMemory != null) return inMemory
+        return if (context != null) resolveTarget(context) else null
+    }
+
+    @Synchronized
+    fun onMessageVisible(
+        context: Context,
+        scopeId: String?,
+        sessionId: String?,
+        completionId: String?,
+    ): Boolean {
+        if (sessionId.isNullOrBlank()) return false
+        val target = resolveTarget(context) ?: return false
+        if (target.matches(scopeId, sessionId, completionId)) {
+            return cancelReplyNotification(context, target.generation)
+        }
+        return false
+    }
+
+    @Synchronized
+    fun cancelReplyNotification(
+        context: Context,
+        expectedGeneration: Long,
+    ): Boolean {
+        val target = resolveTarget(context)
+        if (target != null && target.generation > expectedGeneration) {
+            return false
+        }
+        val manager =
+            context.getSystemService(Context.NOTIFICATION_SERVICE) as? NotificationManager
+                ?: return false
+
+        val activeInfo = activeNotificationProvider(context)
+        if (activeInfo != null) {
+            if (activeInfo.kind != KIND_REPLY) {
+                activeTarget = null
+                return false
+            }
+            if (activeInfo.generation <= tombstoneGeneration.get()) {
+                activeTarget = null
+                return false
+            }
+            if (activeInfo.generation > expectedGeneration) {
+                return false
+            }
+        }
+
+        tombstoneGeneration.updateAndGet { maxOf(it, expectedGeneration) }
+        manager.cancel(ChatNotificationService.PENDING_NOTIFICATION_ID)
+        activeTarget = null
+        return true
+    }
+
+    private fun resolveTarget(context: Context): ReplyNotificationTarget? {
+        val inMemory = activeTarget
+        if (inMemory != null) return inMemory
+
+        val activeInfo = activeNotificationProvider(context) ?: return null
+        if (activeInfo.kind != KIND_REPLY) return null
+        generationCounter.updateAndGet { maxOf(it, activeInfo.generation) }
+        if (activeInfo.generation <= tombstoneGeneration.get()) return null
+        val sessionId = activeInfo.sessionId.orEmpty()
+        if (sessionId.isBlank()) return null
+
+        return ReplyNotificationTarget(
+            scopeId = activeInfo.scopeId.orEmpty(),
+            sessionId = sessionId,
+            completionId = activeInfo.completionId.orEmpty(),
+            generation = activeInfo.generation,
+            textSnippet = activeInfo.textSnippet.orEmpty(),
+            timestamp = activeInfo.timestamp,
+            serverMessageId = activeInfo.serverMessageId,
+        ).also { activeTarget = it }
+    }
+
+    @VisibleForTesting
+    fun resetForTest() {
+        activeTarget = null
+        generationCounter.set(0L)
+        tombstoneGeneration.set(0L)
+        activeNotificationProvider = defaultActiveNotificationProvider
+    }
+
+    @VisibleForTesting
+    fun setTargetForTest(target: ReplyNotificationTarget?) {
+        activeTarget = target
+    }
+}
diff --git a/app/src/main/java/com/m57/hermescontrol/notification/TurnCorrelationTracker.kt b/app/src/main/java/com/m57/hermescontrol/notification/TurnCorrelationTracker.kt
new file mode 100644
index 00000000..8c3d8656
--- /dev/null
+++ b/app/src/main/java/com/m57/hermescontrol/notification/TurnCorrelationTracker.kt
@@ -0,0 +1,384 @@
+package com.m57.hermescontrol.notification
+
+import android.content.Context
+import androidx.annotation.VisibleForTesting
+import com.m57.hermescontrol.data.local.AuthManager
+import com.m57.hermescontrol.data.model.SessionMessage
+import com.m57.hermescontrol.data.remote.ApiClient
+import com.m57.hermescontrol.data.remote.NetworkResult
+import com.m57.hermescontrol.data.remote.safeApiCall
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.withTimeoutOrNull
+import java.util.concurrent.atomic.AtomicLong
+
+/**
+ * Durable lower bound for one mobile-originated turn: the highest REST
+ * transcript row id that existed immediately BEFORE `prompt.submit` left the
+ * device.
+ *
+ * The id is the gateway's AUTOINCREMENT `messages.id`, so every row persisted
+ * by the turn itself is strictly greater than [beforeMessageId]. That gives the
+ * notification layer a turn-scoped window it can search without text
+ * heuristics, row ordering, or cross-machine clocks.
+ *
+ * Captured before the prompt is submitted, never after: a fast turn can persist
+ * its assistant row before a post-submit snapshot request finishes, which would
+ * place the reply inside the "before" snapshot (and a lower bound can then never
+ * exclude it).
+ */
+data class TurnBoundary(
+    val scopeId: String,
+    val sessionId: String,
+    val beforeMessageId: Int,
+    /** Monotonic arm order — a stale clear must not remove a newer turn's boundary. */
+    val generation: Long,
+    val armedAt: Long,
+) {
+    fun matchesKey(
+        otherScopeId: String,
+        otherSessionId: String,
+    ): Boolean = scopeId == otherScopeId && sessionId == otherSessionId
+}
+
+/** Persistence seam so the tracker can be unit-tested without an Android context. */
+internal interface TurnBoundaryStore {
+    fun read(): List<TurnBoundary>
+
+    fun write(boundaries: List<TurnBoundary>)
+}
+
+/**
+ * SharedPreferences-backed store — a handful of tiny `scope|session -> state`
+ * rows, so a process death during a running turn does not lose the boundary.
+ */
+internal class PrefsTurnBoundaryStore(
+    context: Context,
+) : TurnBoundaryStore {
+    private val prefs =
+        context.applicationContext.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+
+    override fun read(): List<TurnBoundary> =
+        prefs.all.mapNotNull { (key, value) -> decodeBoundary(key, value as? String) }
+
+    override fun write(boundaries: List<TurnBoundary>) {
+        val editor = prefs.edit().clear()
+        boundaries.forEach { editor.putString(encodeKey(it.scopeId, it.sessionId), encodeValue(it)) }
+        editor.apply()
+    }
+
+    internal companion object {
+        const val PREFS_NAME = "hermes_turn_boundaries"
+        private const val KEY_SEPARATOR = '|'
+
+        fun encodeKey(
+            scopeId: String,
+            sessionId: String,
+        ): String = "$scopeId$KEY_SEPARATOR$sessionId"
+
+        fun encodeValue(boundary: TurnBoundary): String =
+            "${boundary.beforeMessageId}:${boundary.generation}:${boundary.armedAt}"
+
+        fun decodeBoundary(
+            key: String,
+            value: String?,
+        ): TurnBoundary? {
+            val separator = key.indexOf(KEY_SEPARATOR)
+            if (separator <= 0 || value == null) return null
+            val parts = value.split(':')
+            if (parts.size != 3) return null
+            val beforeMessageId = parts[0].toIntOrNull() ?: return null
+            val generation = parts[1].toLongOrNull() ?: return null
+            val armedAt = parts[2].toLongOrNull() ?: return null
+            return TurnBoundary(
+                scopeId = key.substring(0, separator),
+                sessionId = key.substring(separator + 1),
+                beforeMessageId = beforeMessageId,
+                generation = generation,
+                armedAt = armedAt,
+            )
+        }
+    }
+}
+
+/**
+ * Turn-boundary registry for reply-notification correlation.
+ *
+ * A boundary is armed per (profile scope, stored session id) immediately before
+ * a mobile-originated prompt is submitted, and consumed when a completion for
+ * that session is handled. Sessions that never had a boundary (desktop/TUI
+ * turns, another connected client, a failed capture, queued or group-chat
+ * turns) simply fail closed: the reply notification is posted without a durable
+ * row id and therefore is never auto-dismissed from REST hydration alone.
+ *
+ * Scope isolation is structural — a boundary is only visible to the exact
+ * profile that armed it, so switching profiles makes the old boundary
+ * unreachable instead of resolvable against the wrong namespace.
+ */
+object TurnCorrelationTracker {
+    /** Bound the registry: stale turns must not accumulate across app restarts. */
+    private const val MAX_ENTRIES = 32
+
+    /** A boundary older than this belongs to a turn nobody is waiting on anymore. */
+    private const val MAX_AGE_MS = 6 * 60 * 60 * 1000L
+
+    private val generationCounter = AtomicLong(0L)
+    private val lock = Any()
+
+    @Volatile
+    private var cache: List<TurnBoundary> = emptyList()
+
+    @Volatile
+    private var store: TurnBoundaryStore? = null
+
+    /** Idempotent — called once from [com.m57.hermescontrol.HermesControlApp]. */
+    fun attach(context: Context) {
+        synchronized(lock) {
+            if (store != null) return
+            // Never let persistence break app startup: an unusable context
+            // degrades to in-memory boundaries.
+            val prefsStore = runCatching { PrefsTurnBoundaryStore(context) }.getOrNull() ?: return
+            store = prefsStore
+            val restored = prune(runCatching { prefsStore.read() }.getOrDefault(emptyList()))
+            cache = restored
+            reserveGenerationFloor(restored)
+        }
+    }
+
+    /** Test seam: swap the persistent store (or detach with `null`). */
+    @VisibleForTesting
+    internal fun attachStore(store: TurnBoundaryStore?) {
+        synchronized(lock) {
+            this.store = store
+            val restored = store?.let { prune(it.read()) } ?: emptyList()
+            cache = restored
+            reserveGenerationFloor(restored)
+        }
+    }
+
+    /**
+     * Records the pre-submit high-watermark. Returns the armed boundary, or null
+     * when the identity is unusable (blank scope/session, no rows and no
+     * confirmed read).
+     */
+    fun armBoundary(
+        scopeId: String,
+        sessionId: String,
+        beforeMessageId: Int,
+        now: Long = System.currentTimeMillis(),
+    ): TurnBoundary? {
+        if (scopeId.isBlank() || sessionId.isBlank() || beforeMessageId < 0) return null
+        val boundary =
+            TurnBoundary(
+                scopeId = scopeId,
+                sessionId = sessionId,
+                beforeMessageId = beforeMessageId,
+                generation = generationCounter.incrementAndGet(),
+                armedAt = now,
+            )
+        synchronized(lock) {
+            val next = prune(cache.filterNot { it.matchesKey(scopeId, sessionId) } + boundary, now = now)
+            cache = next
+            runCatching { store?.write(next) }
+        }
+        return boundary
+    }
+
+    fun boundaryFor(
+        scopeId: String,
+        sessionId: String,
+        now: Long = System.currentTimeMillis(),
+    ): TurnBoundary? {
+        if (scopeId.isBlank() || sessionId.isBlank()) return null
+        return synchronized(lock) {
+            cache.firstOrNull { it.matchesKey(scopeId, sessionId) && isFresh(it, now) }
+        }
+    }
+
+    /**
+     * Consumes a boundary. [generation] guards the race where a newer turn armed
+     * a replacement while an older completion was still being correlated.
+     */
+    fun clearBoundary(
+        scopeId: String,
+        sessionId: String,
+        generation: Long? = null,
+    ): Boolean {
+        synchronized(lock) {
+            val existing = cache.firstOrNull { it.matchesKey(scopeId, sessionId) } ?: return false
+            if (generation != null && existing.generation != generation) return false
+            val next = cache.filterNot { it === existing }
+            cache = next
+            runCatching { store?.write(next) }
+            return true
+        }
+    }
+
+    private fun prune(
+        boundaries: List<TurnBoundary>,
+        now: Long = System.currentTimeMillis(),
+    ): List<TurnBoundary> =
+        boundaries
+            .filter { isFresh(it, now) }
+            .sortedByDescending { it.armedAt }
+            .take(MAX_ENTRIES)
+
+    /**
+     * Keeps generations unique across process death.
+     *
+     * The counter lives in memory only, so after a restart a restored boundary
+     * (generation N) and the next armed boundary would both be N — and the
+     * stale-clear guard, which exists precisely to stop an old completion's
+     * clear from removing a newer turn's boundary, would stop protecting
+     * anything. Lifting the counter above the recovered generations keeps the
+     * guard meaningful.
+     */
+    private fun reserveGenerationFloor(restored: List<TurnBoundary>) {
+        val maxRestored = restored.maxOfOrNull { it.generation } ?: 0L
+        generationCounter.updateAndGet { maxOf(it, maxRestored) }
+    }
+
+    private fun isFresh(
+        boundary: TurnBoundary,
+        now: Long,
+    ): Boolean = now - boundary.armedAt <= MAX_AGE_MS
+
+    @VisibleForTesting
+    internal fun resetForTest() {
+        synchronized(lock) {
+            cache = emptyList()
+            store = null
+            generationCounter.set(0L)
+        }
+    }
+}
+
+/** How long the pre-submit boundary read may take before the turn goes uncorrelatable. */
+private const val TURN_BOUNDARY_TIMEOUT_MS = 1_500L
+
+/**
+ * Correlation scope for the active connection profile.
+ *
+ * `AuthManager.activeProfileId` stays null until a server profile is explicitly
+ * selected, and the rest of AuthManager treats that as
+ * [AuthManager.DEFAULT_PROFILE_ID] (see `currentDataScope()`). Collapsing
+ * null/blank here gives this feature ONE scope identity — a raw `.orEmpty()`
+ * would reject the default profile, so a normal install would arm no boundary,
+ * resolve no row, and silently never auto-dismiss a reply notification.
+ *
+ * The arming side (prompt submit), the resolution side (completion), the
+ * notification extras, and the chat viewport observer must ALL use this, or the
+ * two halves disagree on the scope and dismissal stops working.
+ */
+internal fun correlationScopeId(): String =
+    AuthManager.activeProfileId.value?.takeIf { it.isNotBlank() }
+        ?: AuthManager.DEFAULT_PROFILE_ID
+
+/** Rows scanned when correlating a completed turn (newest-first page). */
+private const val TURN_ROW_SCAN_LIMIT = 20
+
+/**
+ * Reads the durable REST transcript high-watermark for [sessionId] and arms a
+ * boundary for it. Call immediately BEFORE submitting the prompt.
+ *
+ * Deliberately does not send a `profile` query param: the boundary ids are later
+ * compared against rows hydrated by the chat screen, which fetches this
+ * endpoint without a profile. Keeping both reads in the same namespace is what
+ * makes the id comparison meaningful.
+ *
+ * Returns false on any failure (including a gateway that does not confirm
+ * `order=latest`) — the caller sends its prompt anyway and the turn simply
+ * becomes uncorrelatable.
+ */
+internal suspend fun captureTurnBoundary(
+    scopeId: String,
+    sessionId: String,
+    timeoutMs: Long = TURN_BOUNDARY_TIMEOUT_MS,
+): Boolean {
+    if (scopeId.isBlank() || sessionId.isBlank()) return false
+    val maxMessageId =
+        try {
+            withTimeoutOrNull(timeoutMs) { fetchBoundaryTailId(sessionId) }
+        } catch (e: CancellationException) {
+            throw e
+        } catch (e: Throwable) {
+            // Total by contract: this probe is best-effort identity for a
+            // notification convenience and must NEVER fail the caller's turn.
+            // Swallowing Throwable (not just Exception) is deliberate — a
+            // gateway-layer Error (uninitialised client, NoClassDefFound) used to
+            // escape past the caller's `catch (Exception)` and get thrown inside
+            // a background scope, which aborted the send and leaked as an
+            // uncaught exception attributed to an unrelated later test.
+            null
+        } ?: return false
+    return TurnCorrelationTracker.armBoundary(scopeId, sessionId, maxMessageId) != null
+}
+
+/**
+ * Newest row id of the transcript, or null when the read cannot be trusted.
+ *
+ * `pagination` is only returned by gateways that honoured `order=latest`; a
+ * backend that ignores the param would answer a `limit=1` probe with the OLDEST
+ * row, producing a boundary that is too low — a lower bound that is too low is
+ * exactly what lets a historical duplicate win. Absent proof, fail closed.
+ */
+private suspend fun fetchBoundaryTailId(sessionId: String): Int? {
+    val result =
+        safeApiCall {
+            ApiClient.hermesApi.getSessionMessages(
+                sessionId = sessionId,
+                limit = 1,
+                offset = 0,
+                includeCompacted = true,
+                order = "latest",
+            )
+        }
+    val body = (result as? NetworkResult.Success)?.data ?: return null
+    // The whole safety property rests on this single row being the HIGHEST id in
+    // the transcript. Require the gateway to confirm it honoured order=latest
+    // (same proof the chat hydration uses) — a backend that ignores the param
+    // answers with the OLDEST row, and a lower bound that is too low is exactly
+    // what lets a historical duplicate win.
+    if (body.pagination?.order != "latest") return null
+    return body.messages.mapNotNull { it.id }.maxOrNull() ?: 0
+}
+
+/** Newest-first REST page used to correlate a completed turn. */
+internal suspend fun fetchTurnRows(sessionId: String): List<SessionMessage>? {
+    val result =
+        safeApiCall {
+            ApiClient.hermesApi.getSessionMessages(
+                sessionId = sessionId,
+                limit = TURN_ROW_SCAN_LIMIT,
+                offset = 0,
+                includeCompacted = true,
+                order = "latest",
+            )
+        }
+    return (result as? NetworkResult.Success)?.data?.messages
+}
+
+/**
+ * Resolves the exact REST row persisted by the turn that just completed, given
+ * the boundary armed before that turn was submitted.
+ *
+ * The boundary is consumed either way in `finally`: the turn it describes is
+ * over, and leaving it armed would let the next completion bind to a row above
+ * a stale lower bound.
+ */
+internal suspend fun correlateCompletedTurnRow(
+    scopeId: String,
+    sessionId: String,
+    completionText: String,
+    resolver: TurnRowResolver = defaultTurnRowResolver,
+): Int? {
+    val boundary = TurnCorrelationTracker.boundaryFor(scopeId, sessionId) ?: return null
+    return try {
+        resolver.resolve(sessionId, boundary, completionText)
+    } finally {
+        TurnCorrelationTracker.clearBoundary(scopeId, sessionId, boundary.generation)
+    }
+}
+
+/** Production resolver — reads the newest REST page for the session. */
+internal val defaultTurnRowResolver =
+    TurnRowResolver(fetchLatestRows = { sessionId -> fetchTurnRows(sessionId) })
diff --git a/app/src/main/java/com/m57/hermescontrol/notification/TurnRowResolver.kt b/app/src/main/java/com/m57/hermescontrol/notification/TurnRowResolver.kt
new file mode 100644
index 00000000..075ccef7
--- /dev/null
+++ b/app/src/main/java/com/m57/hermescontrol/notification/TurnRowResolver.kt
@@ -0,0 +1,93 @@
+package com.m57.hermescontrol.notification
+
+import com.m57.hermescontrol.data.model.SessionMessage
+import com.m57.hermescontrol.ui.chat.HostMediaExtractor
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.delay
+
+/**
+ * Resolves the one persisted REST assistant row produced by a completed
+ * mobile-originated turn.
+ *
+ * Design rules (all of them are load-bearing):
+ * - Only rows strictly above [TurnBoundary.beforeMessageId] are candidates, so
+ *   historical duplicates can never win.
+ * - The FULL completion text is compared, never the 100-character notification
+ *   preview.
+ * - Exactly one candidate resolves. Zero candidates retry (the row may not be
+ *   persisted yet). More than one candidate is ambiguous and fails closed —
+ *   `firstOrNull`, `lastOrNull`, `maxBy` and "newest match" are all guessing.
+ * - Never compares Android notification time with server timestamps.
+ */
+internal class TurnRowResolver(
+    private val fetchLatestRows: suspend (String) -> List<SessionMessage>?,
+    /** Attempt delays; the first attempt runs immediately. */
+    private val retryDelaysMs: List<Long> = listOf(0L, 200L, 400L),
+) {
+    suspend fun resolve(
+        sessionId: String,
+        boundary: TurnBoundary,
+        completionText: String,
+    ): Int? {
+        val wanted = assistantTextKey(completionText)
+        if (wanted.isEmpty) return null
+        if (sessionId.isBlank()) return null
+
+        for ((attempt, delayMs) in retryDelaysMs.withIndex()) {
+            if (attempt > 0) delay(delayMs)
+            val rows = fetchRows(sessionId) ?: continue
+            val candidates =
+                rows.mapNotNull { row ->
+                    val id = row.id ?: return@mapNotNull null
+                    if (id <= boundary.beforeMessageId) return@mapNotNull null
+                    if (!row.role.equals("assistant", ignoreCase = true)) return@mapNotNull null
+                    if (assistantTextKey(row.contentText) != wanted) return@mapNotNull null
+                    id
+                }
+            if (candidates.size == 1) return candidates.single()
+            // Two rows above the boundary match this completion: the turn's own
+            // row cannot be told apart from the other. Leave the notification
+            // active rather than bind it to a coin flip.
+            if (candidates.size > 1) return null
+        }
+        return null
+    }
+
+    private suspend fun fetchRows(sessionId: String): List<SessionMessage>? =
+        try {
+            fetchLatestRows(sessionId)
+        } catch (e: CancellationException) {
+            throw e
+        } catch (e: Exception) {
+            null
+        }
+}
+
+/**
+ * Normalized comparison key for an assistant row.
+ *
+ * Text replies compare their trimmed full text. `MEDIA:` replies compare the
+ * directive-stripped text PLUS the extracted host paths, using the same
+ * canonicalization the chat mapper applies before rendering — so a MEDIA row
+ * and the matching completion agree on both halves, and a MEDIA-only reply
+ * (which strips to an empty string) still compares by its paths instead of
+ * degenerating into "any assistant row".
+ */
+internal data class AssistantTextKey(
+    val text: String,
+    val media: List<String>,
+) {
+    val isEmpty: Boolean
+        get() = text.isBlank() && media.isEmpty()
+}
+
+private const val MEDIA_DIRECTIVE = "MEDIA:"
+
+internal fun assistantTextKey(raw: String): AssistantTextKey {
+    val trimmed = raw.trim()
+    if (!trimmed.contains(MEDIA_DIRECTIVE)) return AssistantTextKey(trimmed, emptyList())
+    return AssistantTextKey(
+        text = HostMediaExtractor.strip(trimmed).trim(),
+        media = HostMediaExtractor.extract(trimmed).map { it.path },
+    )
+}
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/bots/group/GroupChatViewModel.kt b/app/src/main/java/com/m57/hermescontrol/ui/bots/group/GroupChatViewModel.kt
index eb10325e..8d6e7fd5 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/bots/group/GroupChatViewModel.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/bots/group/GroupChatViewModel.kt
@@ -696,6 +696,11 @@ class GroupChatViewModel(
             storedId?.let { inFlightTurns[it] = turnDeferred }
 
             try {
+                // Bot-group turns are orchestrated across per-bot sessions that
+                // are created and swapped mid-flight, so no clean pre-submit
+                // turn boundary can be proven for them. They stay uncorrelated
+                // (reply notifications from group turns are never auto-dismissed
+                // from REST hydration) instead of borrowing another turn's bound.
                 HermesWsClient
                     .request(
                         WsMethods.PROMPT_SUBMIT,
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatMessage.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatMessage.kt
index 783ddba0..3f48a358 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatMessage.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatMessage.kt
@@ -85,6 +85,8 @@ data class ChatMessage(
     val tokenCount: Int? = null,
     /** Tokens per second generation speed (persisted to SQLite). */
     val tps: Double? = null,
+    /** Stable completion identity correlating with reply notifications for read tracking. */
+    val completionId: String? = null,
 )
 
 /**
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatScreen.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatScreen.kt
index 2c6d0adf..287ce2fb 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatScreen.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatScreen.kt
@@ -155,6 +155,7 @@ fun ChatScreen(
     val credentialWarning by HermesWsClient.credentialWarning.collectAsStateWithLifecycle()
     val connectorsViewModel: ChatConnectorsViewModel = viewModel()
     val connectorsState by connectorsViewModel.uiState.collectAsStateWithLifecycle()
+    val actionProgressState by viewModel.actionProgress.state.collectAsStateWithLifecycle()
     // Snapshot-backed search state — read directly so only the scopes that
     // read its fields recompose on search changes (bar, matched bubbles).
     val searchState = viewModel.searchState
@@ -426,6 +427,20 @@ fun ChatScreen(
             context = context,
         )
 
+    val isChatContentReadable =
+        !showReloginDialog &&
+            !state.updateConfirmOpen &&
+            !actionProgressState.visible &&
+            !state.showModelPicker &&
+            state.modelSwitchConfirmMessage == null &&
+            state.sudoPrompt == null &&
+            state.secretPrompt == null &&
+            !(showContextSheet && state.contextBreakdown != null) &&
+            !showSubagentInspectionSheet &&
+            state.btwState == null &&
+            viewingImage == null &&
+            !connectorsState.isVisible
+
     // Lifecycle effects, permissions, session switching, auto-scroll, errors
     ChatLifecycleEffects(
         sessionId = sessionId,
@@ -442,6 +457,7 @@ fun ChatScreen(
         scrollController = scrollController,
         snackbarHostState = snackbarHostState,
         viewModel = viewModel,
+        isOverlayActive = !isChatContentReadable,
     )
 
     HermesScaffold(
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatServerMessageMapper.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatServerMessageMapper.kt
index 2ef7269b..b536fdae 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatServerMessageMapper.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatServerMessageMapper.kt
@@ -5,6 +5,7 @@ import com.m57.hermescontrol.data.model.Attachment
 import com.m57.hermescontrol.data.model.AttachmentSource
 import com.m57.hermescontrol.data.model.SessionMessage
 import com.m57.hermescontrol.data.remote.GatewayFileClient
+import com.m57.hermescontrol.notification.ReplyNotificationTracker
 
 /**
  * Maps REST transcript rows ([SessionMessage]) into UI [ChatMessage]s.
@@ -20,12 +21,93 @@ internal fun mapServerMessages(
     offset: Int,
     latestPaging: Boolean,
     liveMessages: List<ChatMessage>,
+    isPagingOlder: Boolean = false,
+    context: android.content.Context? = null,
 ): List<ChatMessage> {
     val existingReasoningMap =
         liveMessages
             .filter { it.reasoningText.isNotBlank() }
             .associateBy { it.content }
 
+    val liveByExactId =
+        liveMessages
+            .filter { !it.completionId.isNullOrBlank() }
+            .associateBy { it.id }
+
+    val unmappedLiveWsAssistants =
+        if (isPagingOlder) {
+            emptyList()
+        } else {
+            liveMessages
+                .filter {
+                    it.role == MessageRole.ASSISTANT && !it.id.startsWith("rest-") &&
+                        !it.completionId.isNullOrBlank()
+                }
+        }
+
+    val wsCompletionIdByRestIndex = mutableMapOf<Int, String>()
+    if (!isPagingOlder) {
+        if (unmappedLiveWsAssistants.isNotEmpty()) {
+            val remainingWs = unmappedLiveWsAssistants.toMutableList()
+            for (i in messages.indices.reversed()) {
+                if (remainingWs.isEmpty()) break
+                val m = messages[i]
+                val r =
+                    when (m.role?.lowercase()) {
+                        "user" -> MessageRole.USER
+                        "system" -> MessageRole.SYSTEM
+                        "tool" -> MessageRole.TOOL
+                        else -> MessageRole.ASSISTANT
+                    }
+                if (r != MessageRole.ASSISTANT) continue
+                val rawContent = m.contentText
+                // Reasoning-only or empty tool placeholder: skip, does not become visible prose
+                if (rawContent.isBlank() && !rawContent.contains("MEDIA:")) continue
+
+                val restId =
+                    if (latestPaging) {
+                        m.id?.let { "rest-$sessionId-$it" } ?: "rest-$sessionId-${offset + i}"
+                    } else {
+                        "rest-$sessionId-${offset + i}"
+                    }
+                if (liveByExactId.containsKey(restId)) continue
+
+                val canonicalContent =
+                    if (rawContent.contains("MEDIA:")) {
+                        HostMediaExtractor.strip(rawContent).trim()
+                    } else {
+                        rawContent.trim()
+                    }
+
+                val wsIdx = remainingWs.indexOfLast { it.content.trim() == canonicalContent }
+                if (wsIdx >= 0) {
+                    remainingWs.removeAt(wsIdx).completionId?.let { compId ->
+                        wsCompletionIdByRestIndex[i] = compId
+                    }
+                }
+            }
+        }
+
+        // REST-only recovery is fail-closed: only a durable server row ID may
+        // transfer notification identity after the WebSocket copy is gone.
+        val activeTarget = ReplyNotificationTracker.getActiveTarget(context)
+        if (
+            activeTarget != null &&
+            activeTarget.sessionId == sessionId &&
+            activeTarget.serverMessageId != null &&
+            wsCompletionIdByRestIndex.values.none { it == activeTarget.completionId }
+        ) {
+            val exactIndex =
+                messages.indexOfFirst { message ->
+                    message.id == activeTarget.serverMessageId &&
+                        message.role.equals("assistant", ignoreCase = true)
+                }
+            if (exactIndex >= 0 && !liveByExactId.containsKey("rest-$sessionId-${activeTarget.serverMessageId}")) {
+                wsCompletionIdByRestIndex[exactIndex] = activeTarget.completionId
+            }
+        }
+    }
+
     // Tool rows in the REST transcript carry NO tool name — the live WS
     // stream was the only source of `toolName`. Match each REST tool row
     // to its WS counterpart by RESULT CONTENT (not position — pagination
@@ -171,6 +253,12 @@ internal fun mapServerMessages(
             }
         }
 
+        val completionId =
+            if (role == MessageRole.ASSISTANT) {
+                liveByExactId[restId]?.completionId ?: wsCompletionIdByRestIndex[index]
+            } else {
+                null
+            }
         val tokenCount = msg.tokenCount ?: TokenEstimator.estimate(finalContent).takeIf { it > 0 }
         mapped.add(
             ChatMessage(
@@ -184,6 +272,7 @@ internal fun mapServerMessages(
                 isStreaming = false,
                 displayKind = msg.display_kind,
                 tokenCount = tokenCount,
+                completionId = completionId,
             ),
         )
     }
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt
index b4a87a99..f0029c79 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt
@@ -28,6 +28,8 @@ import com.m57.hermescontrol.data.ws.HermesWsClient
 import com.m57.hermescontrol.data.ws.WsEvent
 import com.m57.hermescontrol.data.ws.WsMethods
 import com.m57.hermescontrol.data.ws.toJsonElement
+import com.m57.hermescontrol.notification.captureTurnBoundary
+import com.m57.hermescontrol.notification.correlationScopeId
 import com.m57.hermescontrol.ui.common.ActionProgressController
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.Dispatchers
@@ -1879,6 +1881,15 @@ class ChatViewModel(
                         },
                     )
                 } else {
+                    // Arm the durable turn boundary BEFORE prompt.submit leaves
+                    // the device: the REST high-watermark has to be read while
+                    // the reply row cannot exist yet. A failed capture is
+                    // non-fatal — the prompt is still sent, the turn just
+                    // becomes uncorrelatable and its reply notification is never
+                    // auto-dismissed from hydration instead of being bound to a
+                    // guessed row.
+                    prepareTurnCorrelation(storageSessionId)
+                    if (dispatchGeneration != sessionGeneration) return@launch
                     wsClient.sendMessage(
                         agentSessionId,
                         fullText,
@@ -1898,6 +1909,17 @@ class ChatViewModel(
         }
     }
 
+    /**
+     * Arms the reply-notification turn boundary for a prompt about to be
+     * submitted. Best-effort by design: sending chat never depends on REST
+     * health, so a failed read only makes this turn's reply notification
+     * uncorrelatable — it stays active instead of being dismissed by a guess.
+     */
+    private suspend fun prepareTurnCorrelation(storageSessionId: String?) {
+        if (storageSessionId.isNullOrBlank()) return
+        captureTurnBoundary(scopeId = correlationScopeId(), sessionId = storageSessionId)
+    }
+
     private fun captureTurnUsageBaselineIfNeeded() {
         if (_streamingState.value.turnUsageBaselineCaptured) return
         _streamingState.update {
@@ -2354,8 +2376,15 @@ class ChatViewModel(
     ) {
         if (text.isBlank()) return
         val sessionId = runtimeSessionId ?: return
+        val storageSessionId = _uiState.value.currentSessionId
         _uiState.update { it.copy(isAgentTyping = true) }
         viewModelScope.launch(ioDispatcher) {
+            // A queued prompt runs behind a turn that is already in flight, so
+            // no clean lower bound exists for it (see /queue). It stays
+            // uncorrelated rather than borrowing the running turn's boundary.
+            if (!queued) {
+                prepareTurnCorrelation(storageSessionId)
+            }
             wsClient.sendMessage(
                 sessionId,
                 text,
@@ -2778,6 +2807,7 @@ class ChatViewModel(
                             serverOffset,
                             latestPaging,
                             _uiState.value.messages,
+                            context = getApplication(),
                         )
                     loadedMessageOffset = serverOffset
                     withContext(ioDispatcher) {
@@ -3211,6 +3241,7 @@ class ChatViewModel(
                             returnedOffset,
                             latestPaging,
                             _uiState.value.messages,
+                            isPagingOlder = true,
                         )
                     loadedMessageOffset = returnedOffset
                     withContext(ioDispatcher) { repo.persistMessages(older, sessionId) }
@@ -3295,6 +3326,7 @@ class ChatViewModel(
                                 nextOffset,
                                 latestPaging,
                                 _uiState.value.messages,
+                                isPagingOlder = true,
                             )
                         if (incoming.isEmpty()) return@launch
                         withContext(ioDispatcher) { repo.persistMessages(incoming, sessionId) }
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatWsEventReducer.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatWsEventReducer.kt
index 1fe44662..53c1b1da 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatWsEventReducer.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/ChatWsEventReducer.kt
@@ -429,9 +429,38 @@ object ChatWsEventReducer {
         // above before this return because the final snapshot is still needed
         // as the next turn's cumulative baseline.
         if (text.isBlank()) {
+            val effects = mutableListOf<ReducerEffect>()
+            val sid = state.currentSessionId
+            var updatedTargetMsg: ChatMessage? = null
+            val updatedMessages =
+                if (!event.completionId.isNullOrBlank()) {
+                    val lastAssistantIdx =
+                        usageState.messages
+                            .indexOfLast {
+                                it.role == MessageRole.ASSISTANT &&
+                                    (streamingState.sealedOrphanIds.contains(it.id) || it.id == streaming?.id)
+                            }.takeIf { it >= 0 }
+                    if (lastAssistantIdx != null) {
+                        usageState.messages.toMutableList().also { list ->
+                            val updated = list[lastAssistantIdx].copy(completionId = event.completionId)
+                            list[lastAssistantIdx] = updated
+                            updatedTargetMsg = updated
+                        }
+                    } else {
+                        usageState.messages
+                    }
+                } else {
+                    usageState.messages
+                }
+            if (sid != null && updatedTargetMsg != null) {
+                effects.add(ReducerEffect.PersistMessage(updatedTargetMsg, sid))
+            }
+            effects.add(ReducerEffect.RefreshSessions)
+            effects.add(ReducerEffect.RefreshContextUsage)
             return ReducerResult(
-                state = usageState.copy(isAgentTyping = false),
+                state = usageState.copy(messages = updatedMessages, isAgentTyping = false),
                 streamingState = StreamingState(),
+                effects = effects,
             )
         }
         val tps = turnUsage?.avgTps.validTpsOrNull() ?: usageState.latestTps.validTpsOrNull()
@@ -449,6 +478,7 @@ object ChatWsEventReducer {
                 finishTimestamp = System.currentTimeMillis(),
                 tokenCount = tokenCount,
                 tps = tps,
+                completionId = event.completionId,
             ) ?: ChatMessage(
                 role = MessageRole.ASSISTANT,
                 content = text,
@@ -456,6 +486,7 @@ object ChatWsEventReducer {
                 finishTimestamp = System.currentTimeMillis(),
                 tokenCount = tokenCount,
                 tps = tps,
+                completionId = event.completionId,
             )
         val effects = mutableListOf<ReducerEffect>()
         val sid = state.currentSessionId
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatLifecycleEffects.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatLifecycleEffects.kt
index a45f6b12..e8cfd3bc 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatLifecycleEffects.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatLifecycleEffects.kt
@@ -10,18 +10,24 @@ import androidx.compose.material3.SnackbarHostState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.platform.LocalContext
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
 import androidx.lifecycle.compose.LocalLifecycleOwner
+import androidx.lifecycle.repeatOnLifecycle
 import com.m57.hermescontrol.NavigationController
 import com.m57.hermescontrol.data.ws.ConnectionStatus
+import com.m57.hermescontrol.notification.ReplyNotificationTracker
+import com.m57.hermescontrol.notification.correlationScopeId
 import com.m57.hermescontrol.ui.chat.ChatMessage
 import com.m57.hermescontrol.ui.chat.ChatViewModel
 import com.m57.hermescontrol.ui.chat.ClarifyUi
 import com.m57.hermescontrol.ui.chat.SecretPromptUi
 import com.m57.hermescontrol.ui.chat.SudoPromptUi
+import kotlinx.coroutines.flow.distinctUntilChanged
 
 @Composable
 fun ChatLifecycleEffects(
@@ -39,6 +45,7 @@ fun ChatLifecycleEffects(
     scrollController: ChatScrollController,
     snackbarHostState: SnackbarHostState,
     viewModel: ChatViewModel,
+    isOverlayActive: Boolean = false,
 ) {
     val context = LocalContext.current
     val lifecycleOwner = LocalLifecycleOwner.current
@@ -87,6 +94,32 @@ fun ChatLifecycleEffects(
         onDispose { lifecycleOwner.lifecycle.removeObserver(observer) }
     }
 
+    val messageMap = remember(messages) { messages.associateBy { it.id } }
+
+    // Auto-dismiss reply notifications when their message is displayed in the viewport
+    LaunchedEffect(lifecycleOwner, currentSessionId, messageMap, listState, isOverlayActive) {
+        lifecycleOwner.lifecycle.repeatOnLifecycle(Lifecycle.State.RESUMED) {
+            snapshotFlow<List<ChatMessage>> {
+                if (currentSessionId.isNullOrBlank() || isOverlayActive) {
+                    emptyList()
+                } else {
+                    ChatReadObserver.findVisibleAssistantMessages(listState.layoutInfo, messageMap)
+                }
+            }.distinctUntilChanged()
+                .collect { visibleAssistantMsgs ->
+                    val scopeId = correlationScopeId()
+                    for (msg in visibleAssistantMsgs) {
+                        ReplyNotificationTracker.onMessageVisible(
+                            context = context,
+                            scopeId = scopeId,
+                            sessionId = currentSessionId,
+                            completionId = msg.completionId,
+                        )
+                    }
+                }
+        }
+    }
+
     // Request POST_NOTIFICATIONS permission on Android 13+
     val requestNotificationPermission =
         rememberLauncherForActivityResult(
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatReadObserver.kt b/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatReadObserver.kt
new file mode 100644
index 00000000..99e3c68b
--- /dev/null
+++ b/app/src/main/java/com/m57/hermescontrol/ui/chat/components/ChatReadObserver.kt
@@ -0,0 +1,49 @@
+package com.m57.hermescontrol.ui.chat.components
+
+import androidx.compose.foundation.lazy.LazyListLayoutInfo
+import com.m57.hermescontrol.ui.chat.ChatMessage
+import com.m57.hermescontrol.ui.chat.MessageRole
+
+object ChatReadObserver {
+    /**
+     * Inspects the LazyColumn's visible items to determine which completed assistant
+     * messages currently have any portion visible within the viewport.
+     *
+     * In [com.m57.hermescontrol.ui.chat.fullbleed.FullBleedChatList], assistant prose
+     * bubbles are keyed with `"prose-${message.id}"`. An item is visible when its top
+     * edge is before the viewport end offset AND its bottom edge (offset + size) is past
+     * the viewport start offset.
+     */
+    fun findVisibleAssistantMessages(
+        layoutInfo: LazyListLayoutInfo,
+        messageMap: Map<String, ChatMessage>,
+    ): List<ChatMessage> {
+        val visible = layoutInfo.visibleItemsInfo
+        if (visible.isEmpty() || messageMap.isEmpty()) return emptyList()
+
+        val start = layoutInfo.viewportStartOffset
+        val end = layoutInfo.viewportEndOffset
+
+        return visible
+            .filter { it.offset + it.size > start && it.offset < end }
+            .mapNotNull { item ->
+                val key = item.key as? String ?: return@mapNotNull null
+                if (key.startsWith("prose-")) {
+                    val msgId = key.removePrefix("prose-")
+                    val msg = messageMap[msgId]
+                    if (msg != null && msg.role == MessageRole.ASSISTANT && !msg.isStreaming) {
+                        msg
+                    } else {
+                        null
+                    }
+                } else {
+                    null
+                }
+            }
+    }
+
+    fun findVisibleAssistantMessages(
+        layoutInfo: LazyListLayoutInfo,
+        messages: List<ChatMessage>,
+    ): List<ChatMessage> = findVisibleAssistantMessages(layoutInfo, messages.associateBy { it.id })
+}
diff --git a/app/src/test/java/com/m57/hermescontrol/data/local/HermesDatabaseMigrationsTest.kt b/app/src/test/java/com/m57/hermescontrol/data/local/HermesDatabaseMigrationsTest.kt
index 63a290fa..f57f20ac 100644
--- a/app/src/test/java/com/m57/hermescontrol/data/local/HermesDatabaseMigrationsTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/data/local/HermesDatabaseMigrationsTest.kt
@@ -85,4 +85,16 @@ class HermesDatabaseMigrationsTest {
                 )
             }
         }
+
+    @Test
+    fun migration7to8_executesCompletionIdColumnAdditionOnSQLiteConnection() =
+        runBlocking {
+            val connection = mockk<SQLiteConnection>(relaxed = true)
+            HermesDatabase.MIGRATION_7_8.migrate(connection)
+            verify(exactly = 1) {
+                connection.execSQL(
+                    "ALTER TABLE `chat_messages` ADD COLUMN `completion_id` TEXT",
+                )
+            }
+        }
 }
diff --git a/app/src/test/java/com/m57/hermescontrol/notification/NotificationReplyReceiverTest.kt b/app/src/test/java/com/m57/hermescontrol/notification/NotificationReplyReceiverTest.kt
index 744d1ac9..c287e05f 100644
--- a/app/src/test/java/com/m57/hermescontrol/notification/NotificationReplyReceiverTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/notification/NotificationReplyReceiverTest.kt
@@ -25,6 +25,7 @@ import org.junit.After
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertNotNull
+import org.junit.Assert.assertNull
 import org.junit.Assert.assertTrue
 import org.junit.Before
 import org.junit.Test
@@ -63,6 +64,7 @@ class NotificationReplyReceiverTest {
     fun setUp() {
         upsertCallCount = 0
         ActiveSessionHolder.clear()
+        ReplyNotificationTracker.resetForTest()
 
         // Mock Android framework statics (same pattern as HermesWsClientTest)
         mockkStatic(android.util.Log::class)
@@ -128,6 +130,7 @@ class NotificationReplyReceiverTest {
     @After
     fun tearDown() {
         ActiveSessionHolder.clear()
+        ReplyNotificationTracker.resetForTest()
         HermesDatabase.setForTest(null)
         unmockkAll()
     }
@@ -186,6 +189,24 @@ class NotificationReplyReceiverTest {
         }
     }
 
+    @Test
+    fun `valid reply clears active reply notification target`() {
+        ReplyNotificationTracker.onReplyNotificationPosted(
+            scopeId = "prof-1",
+            sessionId = "session-abc",
+            completionId = "comp-1",
+            textSnippet = "old reply",
+            generation = 1L,
+        )
+        assertNotNull(ReplyNotificationTracker.getActiveTarget())
+
+        givenValidReply("session-abc", "Hello")
+        receiver.onReceive(mockContext, mockIntent)
+        Thread.sleep(500)
+
+        assertNull(ReplyNotificationTracker.getActiveTarget())
+    }
+
     @Test
     fun `valid reply finishes pending result after Room save`() {
         givenValidReply("session-abc", "Hello")
diff --git a/app/src/test/java/com/m57/hermescontrol/notification/ReplyNotificationTrackerTest.kt b/app/src/test/java/com/m57/hermescontrol/notification/ReplyNotificationTrackerTest.kt
new file mode 100644
index 00000000..3219a17d
--- /dev/null
+++ b/app/src/test/java/com/m57/hermescontrol/notification/ReplyNotificationTrackerTest.kt
@@ -0,0 +1,253 @@
+package com.m57.hermescontrol.notification
+
+import android.app.NotificationManager
+import android.content.Context
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+
+class ReplyNotificationTrackerTest {
+    private lateinit var mockContext: Context
+    private lateinit var mockNotificationManager: NotificationManager
+
+    @Before
+    fun setUp() {
+        mockContext = mockk(relaxed = true)
+        mockNotificationManager = mockk(relaxed = true)
+        every { mockContext.getSystemService(Context.NOTIFICATION_SERVICE) } returns mockNotificationManager
+        ReplyNotificationTracker.resetForTest()
+    }
+
+    @After
+    fun tearDown() {
+        ReplyNotificationTracker.resetForTest()
+    }
+
+    @Test
+    fun `onReplyNotificationPosted sets target correctly`() {
+        val gen = ReplyNotificationTracker.nextGeneration()
+        ReplyNotificationTracker.onReplyNotificationPosted(
+            scopeId = "prof-1",
+            sessionId = "sess-123",
+            completionId = "comp-456",
+            textSnippet = "Hello world reply",
+            generation = gen,
+        )
+
+        val target = ReplyNotificationTracker.getActiveTarget()
+        assertEquals("prof-1", target?.scopeId)
+        assertEquals("sess-123", target?.sessionId)
+        assertEquals("comp-456", target?.completionId)
+        assertEquals("Hello world reply", target?.textSnippet)
+        assertEquals(gen, target?.generation)
+    }
+
+    @Test
+    fun `matches verifies scope, session and completionId`() {
+        val target =
+            ReplyNotificationTarget(
+                scopeId = "prof-1",
+                sessionId = "sess-123",
+                completionId = "comp-456",
+                generation = 1L,
+                textSnippet = "Answer text",
+            )
+
+        assertTrue(target.matches("prof-1", "sess-123", "comp-456"))
+        // Scoped target rejects blank or null scope
+        assertFalse(target.matches("", "sess-123", "comp-456"))
+        assertFalse(target.matches(null, "sess-123", "comp-456"))
+
+        // Target with blank scope matches unspecified scope
+        val unscopedTarget = target.copy(scopeId = "")
+        assertTrue(unscopedTarget.matches("", "sess-123", "comp-456"))
+        assertTrue(unscopedTarget.matches(null, "sess-123", "comp-456"))
+
+        // Wrong session fails
+        assertFalse(target.matches("prof-1", "other-sess", "comp-456"))
+        // Wrong scope fails
+        assertFalse(target.matches("prof-2", "sess-123", "comp-456"))
+        // Wrong completionId fails
+        assertFalse(target.matches("prof-1", "sess-123", "other-comp"))
+    }
+
+    @Test
+    fun `matches requires exact completionId match and rejects null or blank`() {
+        val target =
+            ReplyNotificationTarget(
+                scopeId = "prof-1",
+                sessionId = "sess-123",
+                completionId = "comp-456",
+                generation = 1L,
+                textSnippet = "Here is the full summary of the changes",
+            )
+
+        assertTrue(
+            target.matches(
+                candidateScopeId = "prof-1",
+                candidateSessionId = "sess-123",
+                candidateCompletionId = "comp-456",
+            ),
+        )
+
+        assertFalse(
+            "Missing candidate completionId must not match target",
+            target.matches(
+                candidateScopeId = "prof-1",
+                candidateSessionId = "sess-123",
+                candidateCompletionId = null,
+            ),
+        )
+
+        assertFalse(
+            "Different candidate completionId must not match target",
+            target.matches(
+                candidateScopeId = "prof-1",
+                candidateSessionId = "sess-123",
+                candidateCompletionId = "other-comp",
+            ),
+        )
+    }
+
+    @Test
+    fun `onNonReplyNotificationPosted clears target`() {
+        ReplyNotificationTracker.onReplyNotificationPosted(
+            scopeId = "prof-1",
+            sessionId = "sess-123",
+            completionId = "comp-456",
+            textSnippet = "Reply",
+            generation = 1L,
+        )
+        assertTrue(ReplyNotificationTracker.getActiveTarget() != null)
+
+        ReplyNotificationTracker.onNonReplyNotificationPosted()
+        assertNull(ReplyNotificationTracker.getActiveTarget())
+    }
+
+    @Test
+    fun `onMessageVisible cancels notification on match and clears target`() {
+        ReplyNotificationTracker.onReplyNotificationPosted(
+            scopeId = "prof-1",
+            sessionId = "sess-123",
+            completionId = "comp-456",
+            textSnippet = "Reply text",
+            generation = 1L,
+        )
+
+        val cancelled =
+            ReplyNotificationTracker.onMessageVisible(
+                context = mockContext,
+                scopeId = "prof-1",
+                sessionId = "sess-123",
+                completionId = "comp-456",
+            )
+
+        assertTrue(cancelled)
+        verify { mockNotificationManager.cancel(ChatNotificationService.PENDING_NOTIFICATION_ID) }
+        assertNull(ReplyNotificationTracker.getActiveTarget())
+    }
+
+    @Test
+    fun `onMessageVisible does not cancel if session does not match`() {
+        ReplyNotificationTracker.onReplyNotificationPosted(
+            scopeId = "prof-1",
+            sessionId = "sess-123",
+            completionId = "comp-456",
+            textSnippet = "Reply text",
+            generation = 1L,
+        )
+
+        val cancelled =
+            ReplyNotificationTracker.onMessageVisible(
+                context = mockContext,
+                scopeId = "prof-1",
+                sessionId = "different-session",
+                completionId = "comp-456",
+            )
+
+        assertFalse(cancelled)
+        verify(inverse = true) { mockNotificationManager.cancel(any()) }
+        assertTrue(ReplyNotificationTracker.getActiveTarget() != null)
+    }
+
+    @Test
+    fun `cancelReplyNotification refuses to cancel if newer generation was posted`() {
+        ReplyNotificationTracker.onReplyNotificationPosted(
+            scopeId = "prof-1",
+            sessionId = "sess-123",
+            completionId = "comp-newer",
+            textSnippet = "Newer reply",
+            generation = 5L,
+        )
+
+        val cancelled =
+            ReplyNotificationTracker.cancelReplyNotification(
+                context = mockContext,
+                expectedGeneration = 4L, // older generation
+            )
+
+        assertFalse(cancelled)
+        verify(inverse = true) { mockNotificationManager.cancel(any()) }
+    }
+
+    @Test
+    fun `cancelReplyNotification refuses to cancel if active notification is not a reply`() {
+        ReplyNotificationTracker.setTargetForTest(null)
+        ReplyNotificationTracker.activeNotificationProvider = {
+            ActiveReplyInfo(
+                id = ChatNotificationService.PENDING_NOTIFICATION_ID,
+                kind = ReplyNotificationTracker.KIND_ACTION,
+                scopeId = "prof-1",
+                sessionId = "sess-123",
+                completionId = "comp-1",
+                textSnippet = "Approval needed",
+                generation = 1L,
+                timestamp = 1000L,
+            )
+        }
+
+        val cancelled =
+            ReplyNotificationTracker.cancelReplyNotification(
+                context = mockContext,
+                expectedGeneration = 1L,
+            )
+
+        assertFalse(cancelled)
+        verify(inverse = true) { mockNotificationManager.cancel(any()) }
+    }
+
+    @Test
+    fun `cold start recovery restores target from active notification extras`() {
+        ReplyNotificationTracker.setTargetForTest(null)
+        ReplyNotificationTracker.activeNotificationProvider = {
+            ActiveReplyInfo(
+                id = ChatNotificationService.PENDING_NOTIFICATION_ID,
+                kind = ReplyNotificationTracker.KIND_REPLY,
+                scopeId = "prof-recovered",
+                sessionId = "sess-recovered",
+                completionId = "comp-recovered",
+                textSnippet = "recovered snippet",
+                generation = 3L,
+                timestamp = 1000L,
+            )
+        }
+
+        val cancelled =
+            ReplyNotificationTracker.onMessageVisible(
+                context = mockContext,
+                scopeId = "prof-recovered",
+                sessionId = "sess-recovered",
+                completionId = "comp-recovered",
+            )
+
+        assertTrue(cancelled)
+        verify { mockNotificationManager.cancel(ChatNotificationService.PENDING_NOTIFICATION_ID) }
+    }
+}
diff --git a/app/src/test/java/com/m57/hermescontrol/notification/TurnCorrelationTrackerTest.kt b/app/src/test/java/com/m57/hermescontrol/notification/TurnCorrelationTrackerTest.kt
new file mode 100644
index 00000000..f5f18794
--- /dev/null
+++ b/app/src/test/java/com/m57/hermescontrol/notification/TurnCorrelationTrackerTest.kt
@@ -0,0 +1,411 @@
+package com.m57.hermescontrol.notification
+
+import com.m57.hermescontrol.data.model.SessionMessage
+import com.m57.hermescontrol.data.remote.ApiClient
+import io.mockk.every
+import io.mockk.mockkObject
+import io.mockk.unmockkObject
+import kotlinx.coroutines.runBlocking
+import kotlinx.serialization.json.JsonPrimitive
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertNotNull
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import java.io.IOException
+
+/**
+ * Turn-boundary correlation contract for reply notifications.
+ *
+ * The invariant under test: a completion may only be bound to a REST row that
+ * is provably inside its own turn — strictly above the pre-submit high-watermark
+ * — and only when exactly one such row matches. Everything else fails closed,
+ * because a notification that stays active is strictly better than one that is
+ * dismissed by the wrong duplicate reply.
+ *
+ * There is deliberately no clock anywhere in this file: Android notification
+ * time and Hermes server time come from different machines.
+ */
+class TurnCorrelationTrackerTest {
+    private val writeLog = mutableListOf<List<TurnBoundary>>()
+    private var storedBoundaries: List<TurnBoundary> = emptyList()
+
+    @Before
+    fun setUp() {
+        writeLog.clear()
+        storedBoundaries = emptyList()
+        TurnCorrelationTracker.resetForTest()
+        TurnCorrelationTracker.attachStore(recordingStore())
+    }
+
+    @After
+    fun tearDown() {
+        TurnCorrelationTracker.resetForTest()
+    }
+
+    // ── Harness ─────────────────────────────────────────────────────────────
+
+    private fun recordingStore(): TurnBoundaryStore =
+        object : TurnBoundaryStore {
+            override fun read(): List<TurnBoundary> = storedBoundaries
+
+            override fun write(boundaries: List<TurnBoundary>) {
+                storedBoundaries = boundaries
+                writeLog.add(boundaries)
+            }
+        }
+
+    private fun row(
+        id: Int,
+        text: String,
+        role: String = "assistant",
+    ) = SessionMessage(id = id, role = role, content = JsonPrimitive(text))
+
+    private fun boundary(
+        beforeMessageId: Int,
+        scopeId: String = "default",
+        sessionId: String = "session",
+    ) = TurnBoundary(
+        scopeId = scopeId,
+        sessionId = sessionId,
+        beforeMessageId = beforeMessageId,
+        generation = 1L,
+        armedAt = 1L,
+    )
+
+    /** Resolver over a scripted sequence of REST pages; records how often it fetched. */
+    private fun scriptedResolver(
+        pages: List<List<SessionMessage>>,
+        fetches: MutableList<Int> = mutableListOf(),
+    ): TurnRowResolver {
+        var index = 0
+        return TurnRowResolver(
+            fetchLatestRows = {
+                fetches.add(index)
+                pages.getOrNull(index++)
+            },
+            retryDelaysMs = listOf(0L, 0L, 0L),
+        )
+    }
+
+    private fun resolve(
+        pages: List<List<SessionMessage>>,
+        completionText: String,
+        beforeMessageId: Int = 0,
+    ): Int? =
+        runBlocking {
+            scriptedResolver(pages).resolve("session", boundary(beforeMessageId), completionText)
+        }
+
+    // ── A/B: historical duplicates can never win ─────────────────────────────
+
+    @Test
+    fun historicalDuplicateBelowBoundaryIsExcluded() {
+        val rows = listOf(row(5, "Done"), row(11, "Done"))
+        assertEquals(11, resolve(listOf(rows), "Done", beforeMessageId = 10))
+    }
+
+    @Test
+    fun oldDuplicateVisibleBeforeOwnRowAppearsIsNeverAccepted() {
+        // Attempt 1 sees only the historical duplicate; the turn's own row has
+        // not been persisted yet. Resolving on the first attempt would bind the
+        // notification to the wrong reply.
+        val fetches = mutableListOf<Int>()
+        val pages =
+            listOf(
+                listOf(row(5, "Done")),
+                listOf(row(5, "Done"), row(11, "Done")),
+            )
+        val resolved =
+            runBlocking {
+                scriptedResolver(pages, fetches)
+                    .resolve("session", boundary(beforeMessageId = 10), "Done")
+            }
+        assertEquals(11, resolved)
+        assertEquals(2, fetches.size)
+    }
+
+    @Test
+    fun rowPersistedOnlyOnFinalAttemptStillResolves() {
+        val pages =
+            listOf(
+                listOf(row(5, "Done")),
+                listOf(row(5, "Done")),
+                listOf(row(5, "Done"), row(11, "Done")),
+            )
+        assertEquals(11, resolve(pages, "Done", beforeMessageId = 10))
+    }
+
+    // ── C: ambiguity fails closed ────────────────────────────────────────────
+
+    @Test
+    fun twoMatchingRowsAboveBoundaryFailClosedWithoutRetrying() {
+        val fetches = mutableListOf<Int>()
+        val pages = listOf(listOf(row(11, "Done"), row(12, "Done")), listOf(row(11, "Done"), row(12, "Done")))
+        val resolved =
+            runBlocking {
+                scriptedResolver(pages, fetches)
+                    .resolve("session", boundary(beforeMessageId = 10), "Done")
+            }
+        assertNull("Ambiguous turn must not be guessed", resolved)
+        assertEquals("Ambiguity is terminal — no pointless retries", 1, fetches.size)
+    }
+
+    @Test
+    fun nonMatchingContentAboveBoundaryFailsClosed() {
+        assertNull(resolve(listOf(listOf(row(11, "Other"))), "Done", beforeMessageId = 10))
+    }
+
+    @Test
+    fun userRowIsNotACandidate() {
+        assertNull(resolve(listOf(listOf(row(11, "Done", role = "user"))), "Done", beforeMessageId = 10))
+    }
+
+    @Test
+    fun blankCompletionTextNeverResolves() {
+        assertNull(resolve(listOf(listOf(row(11, "Done"))), "   ", beforeMessageId = 10))
+    }
+
+    // ── Truncation / MEDIA ───────────────────────────────────────────────────
+
+    @Test
+    fun identicalHundredCharacterPrefixStillDisambiguates() {
+        val prefix = "x".repeat(100)
+        val rows =
+            listOf(
+                row(11, prefix + "A"),
+                row(12, prefix + "B"),
+            )
+        // The full completion text is compared, never the 100-char preview, so
+        // the shared prefix cannot make the two rows interchangeable.
+        assertEquals(12, resolve(listOf(rows), prefix + "B", beforeMessageId = 10))
+    }
+
+    @Test
+    fun mediaReplyResolvesByCanonicalTextAndPath() {
+        val completion = "Here is the image MEDIA:/opt/hermes/image.png"
+        val rows =
+            listOf(
+                row(11, "Here is another image MEDIA:/opt/hermes/other.png"),
+                row(12, "Here is the image MEDIA:/opt/hermes/image.png"),
+            )
+        assertEquals(12, resolve(listOf(rows), completion, beforeMessageId = 10))
+    }
+
+    @Test
+    fun mediaOnlyReplyResolvesByPathInsteadOfMatchingAnyAssistantRow() {
+        val rows =
+            listOf(
+                row(11, "something else entirely"),
+                row(12, "MEDIA:/opt/hermes/image.png"),
+            )
+        assertEquals(12, resolve(listOf(rows), "MEDIA:/opt/hermes/image.png", beforeMessageId = 10))
+    }
+
+    @Test
+    fun duplicateMediaRowsAfterBoundaryFailClosed() {
+        val rows =
+            listOf(
+                row(11, "MEDIA:/opt/hermes/image.png"),
+                row(12, "MEDIA:/opt/hermes/image.png"),
+            )
+        assertNull(resolve(listOf(rows), "MEDIA:/opt/hermes/image.png", beforeMessageId = 10))
+    }
+
+    // ── F: REST failure ──────────────────────────────────────────────────────
+
+    @Test
+    fun restFailureFailsClosed() {
+        val resolver =
+            TurnRowResolver(
+                fetchLatestRows = { throw IOException("gateway unreachable") },
+                retryDelaysMs = listOf(0L, 0L, 0L),
+            )
+        assertNull(runBlocking { resolver.resolve("session", boundary(10), "Done") })
+    }
+
+    @Test
+    fun emptyPagesFailClosed() {
+        assertNull(resolve(listOf(emptyList(), emptyList()), "Done", beforeMessageId = 10))
+    }
+
+    // ── G/H/I: missing, cross-profile and cross-session boundaries ───────────
+
+    @Test
+    fun noBoundaryMeansNoLookupAtAll() {
+        val fetches = mutableListOf<Int>()
+        val resolved =
+            runBlocking {
+                correlateCompletedTurnRow(
+                    scopeId = "default",
+                    sessionId = "session",
+                    completionText = "Done",
+                    resolver = scriptedResolver(listOf(listOf(row(11, "Done"))), fetches),
+                )
+            }
+        assertNull(resolved)
+        assertTrue("Uncorrelatable turns must not even hit REST", fetches.isEmpty())
+    }
+
+    @Test
+    fun boundaryFromAnotherProfileIsInvisible() {
+        TurnCorrelationTracker.armBoundary("other-profile", "session", 10)
+        val fetches = mutableListOf<Int>()
+        val resolved =
+            runBlocking {
+                correlateCompletedTurnRow(
+                    scopeId = "default",
+                    sessionId = "session",
+                    completionText = "Done",
+                    resolver = scriptedResolver(listOf(listOf(row(11, "Done"))), fetches),
+                )
+            }
+        assertNull(resolved)
+        assertTrue(fetches.isEmpty())
+    }
+
+    @Test
+    fun boundaryFromAnotherSessionIsInvisible() {
+        TurnCorrelationTracker.armBoundary("default", "other-session", 10)
+        val fetches = mutableListOf<Int>()
+        val resolved =
+            runBlocking {
+                correlateCompletedTurnRow(
+                    scopeId = "default",
+                    sessionId = "session",
+                    completionText = "Done",
+                    resolver = scriptedResolver(listOf(listOf(row(11, "Done"))), fetches),
+                )
+            }
+        assertNull(resolved)
+        assertTrue(fetches.isEmpty())
+    }
+
+    // ── Boundary lifecycle ───────────────────────────────────────────────────
+
+    @Test
+    fun correlateResolvesThenConsumesTheBoundary() {
+        TurnCorrelationTracker.armBoundary("default", "session", 10)
+        val pages = listOf(listOf(row(11, "Done")))
+        val first =
+            runBlocking {
+                correlateCompletedTurnRow("default", "session", "Done", scriptedResolver(pages))
+            }
+        assertEquals(11, first)
+        assertNull(
+            "The turn is over — its boundary must be spent",
+            TurnCorrelationTracker.boundaryFor("default", "session"),
+        )
+
+        val second =
+            runBlocking {
+                correlateCompletedTurnRow("default", "session", "Done", scriptedResolver(pages))
+            }
+        assertNull("A second completion must not reuse the consumed boundary", second)
+    }
+
+    @Test
+    fun armingPersistsAndSurvivesProcessRestart() {
+        TurnCorrelationTracker.armBoundary("default", "session", 41)
+        assertEquals(41, storedBoundaries.single().beforeMessageId)
+
+        // Simulate a fresh process: same store content, empty in-memory cache.
+        TurnCorrelationTracker.resetForTest()
+        TurnCorrelationTracker.attachStore(recordingStore())
+        assertEquals(41, TurnCorrelationTracker.boundaryFor("default", "session")?.beforeMessageId)
+    }
+
+    /**
+     * The generation counter is in-memory only, so a restart must lift it above
+     * whatever the restored boundaries already used. Otherwise an old
+     * completion's clear (generation N) matches the NEW boundary (also N) and the
+     * stale-clear guard stops protecting the newer turn.
+     */
+    @Test
+    fun restoredBoundaryGenerationAdvancesTheCounterPastIt() {
+        storedBoundaries =
+            listOf(
+                TurnBoundary(
+                    scopeId = "default",
+                    sessionId = "session",
+                    beforeMessageId = 10,
+                    generation = 37L,
+                    armedAt = System.currentTimeMillis(),
+                ),
+            )
+        TurnCorrelationTracker.resetForTest()
+        TurnCorrelationTracker.attachStore(recordingStore())
+        assertEquals(37L, TurnCorrelationTracker.boundaryFor("default", "session")?.generation)
+
+        val next = TurnCorrelationTracker.armBoundary("default", "session", 25)
+        assertNotNull(next)
+        assertTrue(
+            "A post-restart boundary must not reuse a recovered generation (got ${next?.generation})",
+            (next?.generation ?: 0L) > 37L,
+        )
+
+        // The old completion, still holding generation 37, must not clear it.
+        assertFalse(TurnCorrelationTracker.clearBoundary("default", "session", 37L))
+        assertEquals(25, TurnCorrelationTracker.boundaryFor("default", "session")?.beforeMessageId)
+    }
+
+    @Test
+    fun reArmingForTheSameSessionReplacesTheBoundary() {
+        TurnCorrelationTracker.armBoundary("default", "session", 10)
+        TurnCorrelationTracker.armBoundary("default", "session", 25)
+        assertEquals(25, TurnCorrelationTracker.boundaryFor("default", "session")?.beforeMessageId)
+        assertEquals(1, storedBoundaries.size)
+    }
+
+    @Test
+    fun staleGenerationCannotClearANewerBoundary() {
+        val stale = TurnCorrelationTracker.armBoundary("default", "session", 10)
+        TurnCorrelationTracker.armBoundary("default", "session", 25)
+        assertNotNull(stale)
+        assertFalse(TurnCorrelationTracker.clearBoundary("default", "session", stale?.generation))
+        assertEquals(25, TurnCorrelationTracker.boundaryFor("default", "session")?.beforeMessageId)
+    }
+
+    @Test
+    fun blankIdentityOrNegativeBoundaryNeverArms() {
+        assertNull(TurnCorrelationTracker.armBoundary("", "session", 10))
+        assertNull(TurnCorrelationTracker.armBoundary("default", "  ", 10))
+        assertNull(TurnCorrelationTracker.armBoundary("default", "session", -1))
+        assertTrue(writeLog.isEmpty())
+    }
+
+    @Test
+    fun zeroBoundaryIsValidForAnEmptyTranscript() {
+        // A brand-new session has no rows yet: the next turn's rows are all
+        // above 0, and there are no historical duplicates to exclude.
+        assertNotNull(TurnCorrelationTracker.armBoundary("default", "session", 0))
+        assertEquals(0, TurnCorrelationTracker.boundaryFor("default", "session")?.beforeMessageId)
+    }
+
+    /**
+     * The probe is best-effort by contract and must never fail the caller's turn.
+     *
+     * A gateway-layer `Error` (uninitialised client, NoClassDefFound) is not an
+     * `Exception`, so it used to escape the caller's `catch (Exception)`, abort
+     * the notification-reply send, and leak out of a background scope — which CI
+     * then reported as `UncaughtExceptionsBeforeTest` in an unrelated later test
+     * class. Encode that as a regression so it cannot come back.
+     */
+    @Test
+    fun boundaryProbeSwallowsEvenGatewayLayerErrors() {
+        mockkObject(ApiClient)
+        try {
+            every { ApiClient.hermesApi } throws ExceptionInInitializerError("ApiClient unavailable")
+            assertFalse(
+                "A broken gateway layer must not fail the turn",
+                runBlocking { captureTurnBoundary("default", "session") },
+            )
+            assertNull(TurnCorrelationTracker.boundaryFor("default", "session"))
+        } finally {
+            unmockkObject(ApiClient)
+        }
+    }
+}
diff --git a/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatReadNotificationIntegrationTest.kt b/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatReadNotificationIntegrationTest.kt
new file mode 100644
index 00000000..3baa2d43
--- /dev/null
+++ b/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatReadNotificationIntegrationTest.kt
@@ -0,0 +1,296 @@
+package com.m57.hermescontrol.ui.chat
+
+import android.app.NotificationManager
+import android.content.Context
+import androidx.compose.foundation.lazy.LazyListItemInfo
+import androidx.compose.foundation.lazy.LazyListLayoutInfo
+import com.m57.hermescontrol.notification.ChatNotificationService
+import com.m57.hermescontrol.notification.ReplyNotificationTracker
+import com.m57.hermescontrol.ui.chat.components.ChatReadObserver
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.verify
+import org.junit.After
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+
+class ChatReadNotificationIntegrationTest {
+    private lateinit var mockContext: Context
+    private lateinit var mockNotificationManager: NotificationManager
+
+    @Before
+    fun setUp() {
+        mockContext = mockk(relaxed = true)
+        mockNotificationManager = mockk(relaxed = true)
+        every { mockContext.getSystemService(Context.NOTIFICATION_SERVICE) } returns mockNotificationManager
+        ReplyNotificationTracker.resetForTest()
+    }
+
+    @After
+    fun tearDown() {
+        ReplyNotificationTracker.resetForTest()
+    }
+
+    private fun createMockItem(
+        key: Any,
+        offset: Int,
+        size: Int,
+    ): LazyListItemInfo {
+        val item = mockk<LazyListItemInfo>()
+        every { item.key } returns key
+        every { item.offset } returns offset
+        every { item.size } returns size
+        return item
+    }
+
+    private fun createMockLayoutInfo(
+        items: List<LazyListItemInfo>,
+        startOffset: Int = 0,
+        endOffset: Int = 1000,
+    ): LazyListLayoutInfo {
+        val layout = mockk<LazyListLayoutInfo>()
+        every { layout.visibleItemsInfo } returns items
+        every { layout.viewportStartOffset } returns startOffset
+        every { layout.viewportEndOffset } returns endOffset
+        return layout
+    }
+
+    @Test
+    fun `end-to-end flow - visible target message cancels notification`() {
+        val scopeId = "profile-main"
+        val sessionId = "session-42"
+        val completionId = "completion-abc"
+        val textSnippet = "Here is the result of your task"
+
+        val generation = ReplyNotificationTracker.nextGeneration()
+        ReplyNotificationTracker.onReplyNotificationPosted(
+            scopeId = scopeId,
+            sessionId = sessionId,
+            completionId = completionId,
+            textSnippet = textSnippet,
+            generation = generation,
+        )
+
+        val targetMessage =
+            ChatMessage(
+                id = "msg-target",
+                role = MessageRole.ASSISTANT,
+                content = textSnippet,
+                completionId = completionId,
+            )
+
+        val layout =
+            createMockLayoutInfo(
+                listOf(
+                    createMockItem("prose-msg-target", offset = 200, size = 150),
+                ),
+            )
+
+        val visibleMessages = ChatReadObserver.findVisibleAssistantMessages(layout, listOf(targetMessage))
+        var wasCancelled = false
+        for (msg in visibleMessages) {
+            if (ReplyNotificationTracker.onMessageVisible(
+                    context = mockContext,
+                    scopeId = scopeId,
+                    sessionId = sessionId,
+                    completionId = msg.completionId,
+                )
+            ) {
+                wasCancelled = true
+            }
+        }
+
+        assertTrue(wasCancelled)
+        verify { mockNotificationManager.cancel(ChatNotificationService.PENDING_NOTIFICATION_ID) }
+    }
+
+    @Test
+    fun `scrolled above target - notification stays until scrolled to target`() {
+        val scopeId = "profile-main"
+        val sessionId = "session-42"
+        val completionId = "completion-abc"
+        val textSnippet = "Newest assistant reply"
+
+        val generation = ReplyNotificationTracker.nextGeneration()
+        ReplyNotificationTracker.onReplyNotificationPosted(
+            scopeId = scopeId,
+            sessionId = sessionId,
+            completionId = completionId,
+            textSnippet = textSnippet,
+            generation = generation,
+        )
+
+        val olderMessage =
+            ChatMessage(
+                id = "msg-older",
+                role = MessageRole.ASSISTANT,
+                content = "Old assistant message",
+                completionId = "comp-old",
+            )
+        val targetMessage =
+            ChatMessage(
+                id = "msg-target",
+                role = MessageRole.ASSISTANT,
+                content = textSnippet,
+                completionId = completionId,
+            )
+        val allMessages = listOf(olderMessage, targetMessage)
+
+        // Viewport 0..1000: user is at the top, only older message is visible; target is at offset 1500 (below viewport)
+        val scrolledUpLayout =
+            createMockLayoutInfo(
+                listOf(
+                    createMockItem("prose-msg-older", offset = 100, size = 200),
+                    createMockItem("prose-msg-target", offset = 1500, size = 300),
+                ),
+                startOffset = 0,
+                endOffset = 1000,
+            )
+
+        val visibleWhenScrolledUp = ChatReadObserver.findVisibleAssistantMessages(scrolledUpLayout, allMessages)
+        var wasCancelledWhenScrolledUp = false
+        for (msg in visibleWhenScrolledUp) {
+            if (ReplyNotificationTracker.onMessageVisible(
+                    context = mockContext,
+                    scopeId = scopeId,
+                    sessionId = sessionId,
+                    completionId = msg.completionId,
+                )
+            ) {
+                wasCancelledWhenScrolledUp = true
+            }
+        }
+
+        assertFalse(wasCancelledWhenScrolledUp)
+        verify(inverse = true) { mockNotificationManager.cancel(any()) }
+
+        // Now user scrolls down: target message enters viewport (offset 400, size 300)
+        val scrolledDownLayout =
+            createMockLayoutInfo(
+                listOf(
+                    createMockItem("prose-msg-target", offset = 400, size = 300),
+                ),
+                startOffset = 0,
+                endOffset = 1000,
+            )
+
+        val visibleWhenScrolledDown = ChatReadObserver.findVisibleAssistantMessages(scrolledDownLayout, allMessages)
+        var wasCancelledWhenScrolledDown = false
+        for (msg in visibleWhenScrolledDown) {
+            if (ReplyNotificationTracker.onMessageVisible(
+                    context = mockContext,
+                    scopeId = scopeId,
+                    sessionId = sessionId,
+                    completionId = msg.completionId,
+                )
+            ) {
+                wasCancelledWhenScrolledDown = true
+            }
+        }
+
+        assertTrue(wasCancelledWhenScrolledDown)
+        verify { mockNotificationManager.cancel(ChatNotificationService.PENDING_NOTIFICATION_ID) }
+    }
+
+    @Test
+    fun `viewing a different session does not dismiss notification`() {
+        val scopeId = "profile-main"
+        val sessionIdWithNotif = "session-notif"
+        val completionId = "completion-abc"
+        val textSnippet = "Important reply"
+
+        ReplyNotificationTracker.onReplyNotificationPosted(
+            scopeId = scopeId,
+            sessionId = sessionIdWithNotif,
+            completionId = completionId,
+            textSnippet = textSnippet,
+            generation = 1L,
+        )
+
+        val messageInOtherSession =
+            ChatMessage(
+                id = "msg-other",
+                role = MessageRole.ASSISTANT,
+                content = "Some other reply",
+                completionId = "other-comp",
+            )
+
+        val layout =
+            createMockLayoutInfo(
+                listOf(
+                    createMockItem("prose-msg-other", offset = 200, size = 150),
+                ),
+            )
+
+        val visibleMessages = ChatReadObserver.findVisibleAssistantMessages(layout, listOf(messageInOtherSession))
+        var wasCancelled = false
+        for (msg in visibleMessages) {
+            if (ReplyNotificationTracker.onMessageVisible(
+                    context = mockContext,
+                    scopeId = scopeId,
+                    sessionId = "different-session-id",
+                    completionId = msg.completionId,
+                )
+            ) {
+                wasCancelled = true
+            }
+        }
+
+        assertFalse(wasCancelled)
+        verify(inverse = true) { mockNotificationManager.cancel(any()) }
+    }
+
+    @Test
+    fun `action notification replacement prevents dismissal by message read`() {
+        val scopeId = "profile-main"
+        val sessionId = "session-42"
+        val completionId = "completion-abc"
+        val textSnippet = "Reply before action"
+
+        // 1. Reply notification posted
+        ReplyNotificationTracker.onReplyNotificationPosted(
+            scopeId = scopeId,
+            sessionId = sessionId,
+            completionId = completionId,
+            textSnippet = textSnippet,
+            generation = 1L,
+        )
+
+        // 2. Later, an approval request arrives and replaces notification ID 2
+        ReplyNotificationTracker.onNonReplyNotificationPosted()
+
+        // 3. User opens chat and views the previous reply message
+        val targetMessage =
+            ChatMessage(
+                id = "msg-target",
+                role = MessageRole.ASSISTANT,
+                content = textSnippet,
+                completionId = completionId,
+            )
+        val layout =
+            createMockLayoutInfo(
+                listOf(
+                    createMockItem("prose-msg-target", offset = 200, size = 150),
+                ),
+            )
+
+        val visibleMessages = ChatReadObserver.findVisibleAssistantMessages(layout, listOf(targetMessage))
+        var wasCancelled = false
+        for (msg in visibleMessages) {
+            if (ReplyNotificationTracker.onMessageVisible(
+                    context = mockContext,
+                    scopeId = scopeId,
+                    sessionId = sessionId,
+                    completionId = msg.completionId,
+                )
+            ) {
+                wasCancelled = true
+            }
+        }
+
+        assertFalse("Action notification must NOT be dismissed by reading chat message", wasCancelled)
+        verify(inverse = true) { mockNotificationManager.cancel(any()) }
+    }
+}
diff --git a/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt b/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt
index 2874b7c2..7c072688 100644
--- a/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt
@@ -10,6 +10,9 @@ import com.m57.hermescontrol.data.local.AuthManager
 import com.m57.hermescontrol.data.local.HermesDatabase
 import com.m57.hermescontrol.data.model.Attachment
 import com.m57.hermescontrol.data.model.AttachmentSource
+import com.m57.hermescontrol.data.model.PaginationInfo
+import com.m57.hermescontrol.data.model.SessionMessage
+import com.m57.hermescontrol.data.model.SessionMessagesResponse
 import com.m57.hermescontrol.data.remote.ApiClient
 import com.m57.hermescontrol.data.remote.GatewayFile
 import com.m57.hermescontrol.data.remote.GatewayFileClient
@@ -21,6 +24,7 @@ import com.m57.hermescontrol.data.ws.HermesWsClient
 import com.m57.hermescontrol.data.ws.JsonRpcError
 import com.m57.hermescontrol.data.ws.WsEvent
 import com.m57.hermescontrol.data.ws.WsMethods
+import com.m57.hermescontrol.notification.TurnCorrelationTracker
 import com.m57.hermescontrol.ui.chat.fakes.FakeChatPersistenceRepository
 import com.m57.hermescontrol.ui.chat.fakes.FakeSlashUsageStore
 import io.mockk.*
@@ -52,6 +56,7 @@ import kotlinx.serialization.json.buildJsonObject
 import kotlinx.serialization.json.jsonObject
 import kotlinx.serialization.json.jsonPrimitive
 import kotlinx.serialization.json.put
+import okhttp3.ResponseBody.Companion.toResponseBody
 import org.junit.After
 import org.junit.Assert.assertArrayEquals
 import org.junit.Assert.assertEquals
@@ -5590,4 +5595,234 @@ class ChatViewModelTest {
 
             io.mockk.verify { AuthManager.setLastOpenedSessionId("session-other-456") }
         }
+
+    // ── Turn-boundary capture ordering (reply-notification correlation) ───────
+
+    /**
+     * Turn boundaries are keyed by the active profile, so these tests need one.
+     * Scoped per test rather than added to setUp: a non-blank profile is also
+     * appended to `session.resume` params, which the older resume/switch tests
+     * assert exactly.
+     */
+    private fun stubActiveProfile() {
+        every { AuthManager.activeProfileId } returns MutableStateFlow<String?>("default")
+    }
+
+    /**
+     * The REST high-watermark must be read BEFORE prompt.submit leaves the
+     * device. Capturing it afterwards lets a fast turn persist its assistant row
+     * first, and a lower bound that already contains the reply can never exclude
+     * a historical duplicate.
+     */
+    @Test
+    fun sendMessage_readsTurnBoundaryBeforeSubmittingPrompt() =
+        runTest {
+            TurnCorrelationTracker.resetForTest()
+            stubActiveProfile()
+            val (viewModel, sessionId) = createViewModelWithSession()
+            val events = mutableListOf<String>()
+            val api = mockk<com.m57.hermescontrol.data.remote.HermesApiService>(relaxed = true)
+            every { ApiClient.hermesApi } returns api
+            coEvery { api.getSessionMessages(any(), any(), any(), any(), any(), any()) } answers {
+                // Only the boundary probe asks for a single newest row.
+                if (arg<Int?>(1) == 1 && arg<String?>(3) == "latest") events += "boundary"
+                retrofit2.Response.success(
+                    SessionMessagesResponse(
+                        messages = listOf(SessionMessage(id = 41, role = "user", content = JsonPrimitive("hi"))),
+                        pagination = PaginationInfo(limit = 1, offset = 0, order = "latest", returned = 1),
+                    ),
+                )
+            }
+            every { HermesWsClient.sendMessage(any(), any(), any(), any()) } answers {
+                events += "submit"
+                reqCount++
+                val id = "req-msg-$reqCount"
+                arg<((String) -> Unit)?>(2)?.invoke(id)
+                id
+            }
+
+            viewModel.sendMessage("hello there")
+            advanceUntilIdle()
+
+            assertEquals(listOf("boundary", "submit"), events)
+            assertEquals(41, TurnCorrelationTracker.boundaryFor("default", sessionId)?.beforeMessageId)
+        }
+
+    @Test
+    fun sendMessage_stillSubmitsWhenBoundaryReadFails() =
+        runTest {
+            TurnCorrelationTracker.resetForTest()
+            stubActiveProfile()
+            val (viewModel, sessionId) = createViewModelWithSession()
+            val api = mockk<com.m57.hermescontrol.data.remote.HermesApiService>(relaxed = true)
+            every { ApiClient.hermesApi } returns api
+            coEvery { api.getSessionMessages(any(), any(), any(), any(), any(), any()) } returns
+                retrofit2.Response.error(500, "boom".toResponseBody())
+            var submits = 0
+            every { HermesWsClient.sendMessage(any(), any(), any(), any()) } answers {
+                submits++
+                reqCount++
+                val id = "req-msg-$reqCount"
+                arg<((String) -> Unit)?>(2)?.invoke(id)
+                id
+            }
+
+            viewModel.sendMessage("hello there")
+            advanceUntilIdle()
+
+            assertEquals("REST health must never block sending chat", 1, submits)
+            assertNull(TurnCorrelationTracker.boundaryFor("default", sessionId))
+        }
+
+    /**
+     * A gateway that ignores `order=latest` answers a `limit=1` probe with the
+     * OLDEST row; trusting that number would arm a boundary that is far too low
+     * and let historical duplicates win. Without the pagination proof the turn is
+     * left uncorrelatable, and the prompt still goes out.
+     */
+    @Test
+    fun sendMessage_leavesTurnUncorrelatableWhenGatewayCannotConfirmOrder() =
+        runTest {
+            TurnCorrelationTracker.resetForTest()
+            stubActiveProfile()
+            val (viewModel, sessionId) = createViewModelWithSession()
+            val api = mockk<com.m57.hermescontrol.data.remote.HermesApiService>(relaxed = true)
+            every { ApiClient.hermesApi } returns api
+            coEvery { api.getSessionMessages(any(), any(), any(), any(), any(), any()) } answers {
+                retrofit2.Response.success(
+                    SessionMessagesResponse(
+                        messages = listOf(SessionMessage(id = 1, role = "user", content = JsonPrimitive("oldest"))),
+                    ),
+                )
+            }
+            var submits = 0
+            every { HermesWsClient.sendMessage(any(), any(), any(), any()) } answers {
+                submits++
+                reqCount++
+                val id = "req-msg-$reqCount"
+                arg<((String) -> Unit)?>(2)?.invoke(id)
+                id
+            }
+
+            viewModel.sendMessage("hello there")
+            advanceUntilIdle()
+
+            assertEquals(1, submits)
+            assertNull(
+                "Unconfirmed row order must not produce a boundary",
+                TurnCorrelationTracker.boundaryFor("default", sessionId),
+            )
+        }
+
+    /**
+     * `AuthManager.activeProfileId` is null until a server profile is explicitly
+     * selected, and the rest of AuthManager treats that as
+     * [AuthManager.DEFAULT_PROFILE_ID]. A raw `.orEmpty()` made the whole feature
+     * a no-op on a normal install: no boundary armed, so no reply notification
+     * could ever be REST-auto-dismissed.
+     */
+    @Test
+    fun sendMessage_nullActiveProfileArmsBoundaryUnderTheDefaultScope() =
+        runTest {
+            TurnCorrelationTracker.resetForTest()
+            every { AuthManager.activeProfileId } returns MutableStateFlow<String?>(null)
+            val (viewModel, sessionId) = createViewModelWithSession()
+            val api = mockk<com.m57.hermescontrol.data.remote.HermesApiService>(relaxed = true)
+            every { ApiClient.hermesApi } returns api
+            coEvery { api.getSessionMessages(any(), any(), any(), any(), any(), any()) } answers {
+                retrofit2.Response.success(
+                    SessionMessagesResponse(
+                        messages = listOf(SessionMessage(id = 41, role = "user", content = JsonPrimitive("hi"))),
+                        pagination = PaginationInfo(limit = 1, offset = 0, order = "latest", returned = 1),
+                    ),
+                )
+            }
+            var submits = 0
+            every { HermesWsClient.sendMessage(any(), any(), any(), any()) } answers {
+                submits++
+                reqCount++
+                val id = "req-msg-$reqCount"
+                arg<((String) -> Unit)?>(2)?.invoke(id)
+                id
+            }
+
+            viewModel.sendMessage("hello there")
+            advanceUntilIdle()
+
+            assertEquals(1, submits)
+            assertEquals(
+                "A default-profile install must still be correlatable",
+                41,
+                TurnCorrelationTracker.boundaryFor(AuthManager.DEFAULT_PROFILE_ID, sessionId)?.beforeMessageId,
+            )
+        }
+
+    /**
+     * `pagination.order` is the only proof the gateway honoured `order=latest`.
+     * A gateway that reports `oldest` answered the `limit=1` probe with the
+     * OLDEST row, and that as a lower bound would sit below the whole transcript
+     * — exactly what lets a historical duplicate win.
+     */
+    @Test
+    fun sendMessage_leavesTurnUncorrelatableWhenGatewayReportsOldestOrder() =
+        runTest {
+            TurnCorrelationTracker.resetForTest()
+            stubActiveProfile()
+            val (viewModel, sessionId) = createViewModelWithSession()
+            val api = mockk<com.m57.hermescontrol.data.remote.HermesApiService>(relaxed = true)
+            every { ApiClient.hermesApi } returns api
+            coEvery { api.getSessionMessages(any(), any(), any(), any(), any(), any()) } answers {
+                retrofit2.Response.success(
+                    SessionMessagesResponse(
+                        messages = listOf(SessionMessage(id = 1, role = "user", content = JsonPrimitive("oldest"))),
+                        pagination = PaginationInfo(limit = 1, offset = 0, order = "oldest", returned = 1),
+                    ),
+                )
+            }
+            var submits = 0
+            every { HermesWsClient.sendMessage(any(), any(), any(), any()) } answers {
+                submits++
+                reqCount++
+                val id = "req-msg-$reqCount"
+                arg<((String) -> Unit)?>(2)?.invoke(id)
+                id
+            }
+
+            viewModel.sendMessage("hello there")
+            advanceUntilIdle()
+
+            assertEquals(1, submits)
+            assertNull(
+                "An unproven row order must not produce a boundary",
+                TurnCorrelationTracker.boundaryFor("default", sessionId),
+            )
+        }
+
+    /**
+     * A queued prompt runs behind a turn that is already in flight, so no clean
+     * lower bound exists for it — it must not borrow the running turn's boundary.
+     */
+    @Test
+    fun queuedPromptNeverArmsATurnBoundary() =
+        runTest {
+            TurnCorrelationTracker.resetForTest()
+            stubActiveProfile()
+            val (viewModel, sessionId) = createViewModelWithSession()
+            val api = mockk<com.m57.hermescontrol.data.remote.HermesApiService>(relaxed = true)
+            every { ApiClient.hermesApi } returns api
+            every { HermesWsClient.sendMessage(any(), any(), any(), any()) } answers {
+                reqCount++
+                val id = "req-msg-$reqCount"
+                arg<((String) -> Unit)?>(2)?.invoke(id)
+                id
+            }
+
+            viewModel.sendMessage("/queue do the thing")
+            advanceUntilIdle()
+
+            io.mockk.coVerify(exactly = 0) {
+                api.getSessionMessages(any(), any(), any(), any(), any(), any())
+            }
+            assertNull(TurnCorrelationTracker.boundaryFor("default", sessionId))
+        }
 }
diff --git a/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatWsEventReducerTest.kt b/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatWsEventReducerTest.kt
index 2b9543c1..7b5814ae 100644
--- a/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatWsEventReducerTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/ui/chat/ChatWsEventReducerTest.kt
@@ -450,6 +450,25 @@ class ChatWsEventReducerTest {
         )
     }
 
+    @Test
+    fun testMessageComplete_setsCompletionIdOnAssistantMessage() {
+        val event =
+            WsEvent.MessageComplete(
+                text = "hello from assistant",
+                sessionId = "session-1",
+                completionId = "comp-123",
+            )
+        val result =
+            ChatWsEventReducer.reduce(
+                state = ChatUiState(),
+                streamingState = StreamingState(),
+                event = event,
+                currentSessionId = "session-1",
+            )
+        val msg = result.state.messages.single()
+        assertEquals("comp-123", msg.completionId)
+    }
+
     @Test
     fun testMessageStart_prunesCompletedSubagents() {
         val completedSubagent =
diff --git a/app/src/test/java/com/m57/hermescontrol/ui/chat/ReadNotificationReviewRegressionTest.kt b/app/src/test/java/com/m57/hermescontrol/ui/chat/ReadNotificationReviewRegressionTest.kt
new file mode 100644
index 00000000..12fe98ca
--- /dev/null
+++ b/app/src/test/java/com/m57/hermescontrol/ui/chat/ReadNotificationReviewRegressionTest.kt
@@ -0,0 +1,807 @@
+package com.m57.hermescontrol.ui.chat
+
+import android.app.Notification
+import android.app.NotificationManager
+import android.content.Context
+import com.m57.hermescontrol.data.config.ServerStore
+import com.m57.hermescontrol.data.config.ServerStoreState
+import com.m57.hermescontrol.data.local.AuthManager
+import com.m57.hermescontrol.data.local.toEntity
+import com.m57.hermescontrol.data.local.toUiModel
+import com.m57.hermescontrol.data.model.SessionMessage
+import com.m57.hermescontrol.data.ws.WsEvent
+import com.m57.hermescontrol.notification.ActiveReplyInfo
+import com.m57.hermescontrol.notification.ChatNotificationService
+import com.m57.hermescontrol.notification.ReplyNotificationTarget
+import com.m57.hermescontrol.notification.ReplyNotificationTracker
+import com.m57.hermescontrol.notification.TurnCorrelationTracker
+import com.m57.hermescontrol.notification.TurnRowResolver
+import com.m57.hermescontrol.notification.correlateCompletedTurnRow
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.unmockkObject
+import io.mockk.verify
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.runBlocking
+import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.JsonPrimitive
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import java.util.concurrent.CountDownLatch
+import java.util.concurrent.TimeUnit
+import java.util.concurrent.atomic.AtomicReference
+
+/**
+ * Regression matrix for reply-notification read dismissal.
+ *
+ * Split by design:
+ * - The `alreadyResolvedServerId*` cases start from a durable server row id that
+ *   the notification already carries, and prove hydration binds it to that exact
+ *   row only — the downstream half of the contract.
+ * - [mobileTurnBoundaryResolvesTheExactRowThenOnlyThatRowDismisses] covers the
+ *   production path that PRODUCES that id (turn boundary → unique row).
+ * - The mobile-side resolution rules themselves live in
+ *   `TurnCorrelationTrackerTest`, and the send-order guarantee in
+ *   `ChatViewModelTest`.
+ *
+ * Nothing here compares Android notification time with Hermes server time;
+ * server row timestamps are not identity.
+ */
+class ReadNotificationReviewRegressionTest {
+    private lateinit var context: Context
+    private lateinit var manager: NotificationManager
+
+    @Before
+    fun setUp() {
+        context = mockk(relaxed = true)
+        manager = mockk(relaxed = true)
+        every { context.getSystemService(Context.NOTIFICATION_SERVICE) } returns manager
+        mockkObject(AuthManager)
+        val mockStore = mockk<ServerStore>(relaxed = true)
+        every { mockStore.getLatestState() } returns ServerStoreState(baseUrl = "http://localhost:8080")
+        every { AuthManager.serverStore } returns mockStore
+        every { AuthManager.getToken() } returns "token"
+        every { AuthManager.activeProfileId } returns MutableStateFlow("default")
+        ReplyNotificationTracker.resetForTest()
+    }
+
+    @After
+    fun tearDown() {
+        ReplyNotificationTracker.resetForTest()
+        unmockkObject(AuthManager)
+    }
+
+    private fun postTarget(text: String = "Done") {
+        ReplyNotificationTracker.onReplyNotificationPosted("default", "session", "new-completion", text, 1L)
+    }
+
+    @Test
+    fun roomRoundTripMustRetainCompletionIdentity() {
+        val live = ChatMessage(role = MessageRole.ASSISTANT, content = "Done", completionId = "new-completion")
+        val restored = live.toEntity("session").toUiModel()
+        assertEquals("Room reload lost notification identity", "new-completion", restored.completionId)
+    }
+
+    @Test
+    fun repeatedTextInHistoryMustNotCopyLatestIdentityOntoOlderMessage() {
+        val live =
+            listOf(
+                ChatMessage(role = MessageRole.ASSISTANT, content = "Done", completionId = "old-completion"),
+                ChatMessage(role = MessageRole.ASSISTANT, content = "Done", completionId = "new-completion"),
+            )
+        val history =
+            listOf(
+                SessionMessage(id = 100, role = "assistant", content = JsonPrimitive("Done")),
+                SessionMessage(id = 200, role = "assistant", content = JsonPrimitive("Done")),
+            )
+        val mapped = mapServerMessages("session", history, 0, true, live)
+        assertEquals(listOf("old-completion", "new-completion"), mapped.map { it.completionId })
+    }
+
+    @Test
+    fun viewingOldCachedTextMustNotClearNewReplyNotification() {
+        postTarget("Done")
+        val old =
+            ChatMessage(role = MessageRole.ASSISTANT, content = "Done yesterday; unrelated old response")
+                .toEntity("session")
+                .toUiModel()
+        val cancelled =
+            ReplyNotificationTracker.onMessageVisible(
+                context,
+                "default",
+                "session",
+                old.completionId,
+            )
+        assertFalse("Old text incorrectly acknowledged the new reply", cancelled)
+        verify(exactly = 0) { manager.cancel(any()) }
+    }
+
+    @Test
+    fun strippedCommentaryCompletionMustBindTerminalVisibleMessage() {
+        val orphan = ChatMessage(id = "orphan", role = MessageRole.ASSISTANT, content = "already shown")
+        val state = ChatUiState(currentSessionId = "session", messages = listOf(orphan))
+        val streaming = StreamingState(streamingMessage = orphan, sealedOrphanIds = listOf("orphan"))
+        val result =
+            ChatWsEventReducer.reduce(
+                state,
+                streaming,
+                WsEvent.MessageComplete("already shown", "session", completionId = "new-completion"),
+                "session",
+            )
+        assertEquals(
+            "Completion lost when no new final bubble is needed",
+            "new-completion",
+            result.state.messages
+                .single()
+                .completionId,
+        )
+        val persistEffect =
+            result.effects.filterIsInstance<ReducerEffect.PersistMessage>().singleOrNull()
+        assertEquals(
+            "PersistMessage effect must be emitted for the sealed orphan bubble so Room persists it",
+            "new-completion",
+            persistEffect?.message?.completionId,
+        )
+    }
+
+    @Test
+    fun loadOlderMessagesMustNotStealCompletionIdFromLiveMessage() {
+        val live =
+            listOf(
+                ChatMessage(
+                    id = "ws-1",
+                    role = MessageRole.ASSISTANT,
+                    content = "Done",
+                    completionId = "new-completion",
+                ),
+            )
+        val olderHistory =
+            listOf(
+                SessionMessage(id = 50, role = "assistant", content = JsonPrimitive("Done")),
+            )
+        val mapped = mapServerMessages("session", olderHistory, 50, true, live, isPagingOlder = true)
+        assertEquals("Older paged message must not steal live completionId", null, mapped.single().completionId)
+    }
+
+    @Test
+    fun duplicateTextOutsideFetchedPageMustNotShiftCompletionId() {
+        val live =
+            listOf(
+                ChatMessage(
+                    id = "rest-session-10",
+                    role = MessageRole.ASSISTANT,
+                    content = "Done",
+                    completionId = null,
+                ),
+                ChatMessage(
+                    id = "rest-session-20",
+                    role = MessageRole.ASSISTANT,
+                    content = "Done",
+                    completionId = "new-completion",
+                ),
+            )
+        // Page only includes message 20 (message 10 is outside this page)
+        val history =
+            listOf(
+                SessionMessage(id = 20, role = "assistant", content = JsonPrimitive("Done")),
+            )
+        val mapped = mapServerMessages("session", history, 0, true, live, isPagingOlder = false)
+        assertEquals(
+            "Exact REST id match must preserve identity regardless of older duplicates",
+            "new-completion",
+            mapped.single().completionId,
+        )
+    }
+
+    @Test
+    fun metadataFreeReplacementMustNotBeCancelled() {
+        postTarget()
+        ReplyNotificationTracker.activeNotificationProvider = {
+            ActiveReplyInfo(2, null, null, null, null, null, 0L, 1L)
+        }
+        assertFalse(ReplyNotificationTracker.onMessageVisible(context, "default", "session", "new-completion"))
+        verify(exactly = 0) { manager.cancel(any()) }
+    }
+
+    @Test
+    fun actionPostingMustNotInterleaveBetweenInspectionAndCancellation() {
+        val reply =
+            ActiveReplyInfo(
+                2,
+                ReplyNotificationTracker.KIND_REPLY,
+                "default",
+                "session",
+                "new-completion",
+                "Done",
+                1L,
+                1L,
+            )
+        val actualSlot = AtomicReference("reply")
+        val ready = CountDownLatch(1)
+        val allowNotify = CountDownLatch(1)
+        val posted = CountDownLatch(1)
+        val action = mockk<Notification>()
+        every { manager.notify(2, action) } answers { actualSlot.set("action") }
+        every { manager.cancel(2) } answers { actualSlot.set("empty") }
+        postTarget()
+        val writer =
+            Thread {
+                // Same split ownership/write sequence as showReplyNotification and NotificationReplyReceiver.
+                ReplyNotificationTracker.onNonReplyNotificationPosted()
+                ready.countDown()
+                check(allowNotify.await(5, TimeUnit.SECONDS))
+                manager.notify(2, action)
+                posted.countDown()
+            }
+        writer.start()
+        assertTrue(ready.await(5, TimeUnit.SECONDS))
+        var reads = 0
+        ReplyNotificationTracker.activeNotificationProvider = {
+            val snapshot = reply
+            reads++
+            if (reads == 2) {
+                // Pause after querying activeNotifications but before cancel(), then complete the action write.
+                allowNotify.countDown()
+                check(posted.await(5, TimeUnit.SECONDS))
+            }
+            snapshot
+        }
+        try {
+            ReplyNotificationTracker.onMessageVisible(context, "default", "session", "new-completion")
+        } finally {
+            allowNotify.countDown()
+            writer.join(6000)
+        }
+        assertEquals("New action notification was cancelled by the old read", "action", actualSlot.get())
+    }
+
+    @Test
+    fun oldReplyRacingNewerActionMustNotPostOrOverwriteAction() {
+        val gen1 = ReplyNotificationTracker.registerPendingReply("default", "session", "comp-1", "Old Reply")
+        val actionNotif = mockk<Notification>()
+        val replyNotif = mockk<Notification>()
+
+        // Action arrives and posts
+        assertTrue(ReplyNotificationTracker.postActionNotification(context, actionNotif))
+        verify(exactly = 1) { manager.notify(ChatNotificationService.PENDING_NOTIFICATION_ID, actionNotif) }
+
+        // Stale reply 1 tries to post after action arrived
+        val posted = ReplyNotificationTracker.postReplyNotification(context, replyNotif, gen1)
+        assertFalse("Stale reply must be rejected after action notification was posted", posted)
+        verify(exactly = 0) { manager.notify(ChatNotificationService.PENDING_NOTIFICATION_ID, replyNotif) }
+        assertNull("Active target must remain null for action", ReplyNotificationTracker.getActiveTarget())
+    }
+
+    @Test
+    fun oldReplyRacingNewerReplyMustNotOverwriteNewerReply() {
+        val gen1 = ReplyNotificationTracker.registerPendingReply("default", "session", "comp-1", "Old Reply")
+        val gen2 = ReplyNotificationTracker.registerPendingReply("default", "session", "comp-2", "New Reply")
+        val replyNotif1 = mockk<Notification>()
+        val replyNotif2 = mockk<Notification>()
+
+        // Gen 2 posts successfully
+        assertTrue(ReplyNotificationTracker.postReplyNotification(context, replyNotif2, gen2))
+        assertEquals("comp-2", ReplyNotificationTracker.getActiveTarget()?.completionId)
+
+        // Stale Gen 1 tries to post
+        assertFalse(ReplyNotificationTracker.postReplyNotification(context, replyNotif1, gen1))
+        assertEquals("comp-2", ReplyNotificationTracker.getActiveTarget()?.completionId)
+    }
+
+    @Test
+    fun readCancelRacingReplyPublicationMustPreventZombieNotification() {
+        val gen1 = ReplyNotificationTracker.registerPendingReply("default", "session", "comp-1", "Pending Reply")
+        val replyNotif = mockk<Notification>()
+
+        // User views message in foreground chat before background service calls postReplyNotification
+        val cancelled =
+            ReplyNotificationTracker.onMessageVisible(
+                context,
+                "default",
+                "session",
+                "comp-1",
+            )
+        assertTrue("Message visibility should cancel the pending reply target", cancelled)
+
+        // Delayed background service finally tries to post reply
+        val posted = ReplyNotificationTracker.postReplyNotification(context, replyNotif, gen1)
+        assertFalse("Tombstoned/cancelled generation must not post notification ID 2", posted)
+        verify(exactly = 0) { manager.notify(ChatNotificationService.PENDING_NOTIFICATION_ID, replyNotif) }
+    }
+
+    @Test
+    fun mediaRepliesRetainCompletionIdAcrossRestRehydration() {
+        val live =
+            listOf(
+                ChatMessage(
+                    id = "ws-media",
+                    role = MessageRole.ASSISTANT,
+                    content = "Here is your chart",
+                    completionId = "comp-media-123",
+                ),
+            )
+        val history =
+            listOf(
+                SessionMessage(
+                    id = 1,
+                    role = "assistant",
+                    content = JsonPrimitive("Here is your chart MEDIA:/opt/hermes/chart.png"),
+                ),
+            )
+        val mapped = mapServerMessages("session", history, 0, true, live, isPagingOlder = false)
+        assertEquals("comp-media-123", mapped.single().completionId)
+    }
+
+    @Test
+    fun mediaOnlyReplyRetainsCompletionIdAcrossRestRehydration() {
+        val live =
+            listOf(
+                ChatMessage(
+                    id = "ws-media-only",
+                    role = MessageRole.ASSISTANT,
+                    content = "",
+                    completionId = "comp-media-only",
+                ),
+            )
+        val history =
+            listOf(
+                SessionMessage(
+                    id = 1,
+                    role = "assistant",
+                    content = JsonPrimitive("MEDIA:/opt/hermes/photo.jpg"),
+                ),
+            )
+        val mapped = mapServerMessages("session", history, 0, true, live, isPagingOlder = false)
+        assertEquals("comp-media-only", mapped.single().completionId)
+    }
+
+    @Test
+    fun mediaReplyWithReasoningOnlyRowBeforeItRetainsCompletionId() {
+        val live =
+            listOf(
+                ChatMessage(
+                    id = "ws-media-reasoning",
+                    role = MessageRole.ASSISTANT,
+                    content = "The result",
+                    completionId = "comp-reasoning-media",
+                ),
+            )
+        val history =
+            listOf(
+                SessionMessage(
+                    id = 1,
+                    role = "assistant",
+                    content = JsonPrimitive(""),
+                    reasoning = JsonPrimitive("thinking step"),
+                ),
+                SessionMessage(id = 2, role = "assistant", content = JsonPrimitive("The result MEDIA:/opt/pic.png")),
+            )
+        val mapped = mapServerMessages("session", history, 0, true, live, isPagingOlder = false)
+        assertEquals("comp-reasoning-media", mapped.single().completionId)
+    }
+
+    @Test
+    fun blankMessageCompleteMustNotCorruptHistoricalAssistantMessage() {
+        val oldAssistant =
+            ChatMessage(
+                id = "old-assistant",
+                role = MessageRole.ASSISTANT,
+                content = "Old reply from yesterday",
+                completionId = "old-comp",
+            )
+        val state = ChatUiState(currentSessionId = "session", messages = listOf(oldAssistant))
+        val streaming = StreamingState() // No current streaming message or sealed orphans
+
+        val result =
+            ChatWsEventReducer.reduce(
+                state,
+                streaming,
+                WsEvent.MessageComplete("", "session", completionId = "new-unrelated-completion"),
+                "session",
+            )
+
+        // Historical assistant message must be completely untouched
+        assertEquals(
+            "old-comp",
+            result.state.messages
+                .single()
+                .completionId,
+        )
+        assertFalse(
+            "PersistMessage effect must not be emitted for unrelated historical messages",
+            result.effects.any { it is ReducerEffect.PersistMessage },
+        )
+    }
+
+    @Test
+    fun coldStartRecoveredGenerationMustAdvanceCounterAndAllowFutureReplies() {
+        ReplyNotificationTracker.resetForTest()
+        // Active notification in system with generation 37
+        val activeInfo =
+            ActiveReplyInfo(
+                id = ChatNotificationService.PENDING_NOTIFICATION_ID,
+                kind = ReplyNotificationTracker.KIND_REPLY,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = "comp-37",
+                textSnippet = "Reply 37",
+                generation = 37L,
+                timestamp = System.currentTimeMillis(),
+            )
+        ReplyNotificationTracker.activeNotificationProvider = { activeInfo }
+
+        // User views message -> recovers and cancels generation 37
+        val cancelled = ReplyNotificationTracker.onMessageVisible(context, "default", "session", "comp-37")
+        assertTrue("Generation 37 should be recovered and cancelled", cancelled)
+
+        // New reply arrives
+        val newGen = ReplyNotificationTracker.registerPendingReply("default", "session", "comp-38", "Reply 38")
+        assertTrue("New generation must exceed recovered generation (was $newGen)", newGen > 37L)
+
+        val replyNotif = mockk<Notification>()
+        val posted = ReplyNotificationTracker.postReplyNotification(context, replyNotif, newGen)
+        assertTrue("New reply notification must be accepted and posted", posted)
+        verify { manager.notify(ChatNotificationService.PENDING_NOTIFICATION_ID, replyNotif) }
+    }
+
+    @Test
+    fun recoveredGenerationFollowedByActionAndReplyMustRemainStrictlyMonotonic() {
+        ReplyNotificationTracker.resetForTest()
+        val activeInfo =
+            ActiveReplyInfo(
+                id = ChatNotificationService.PENDING_NOTIFICATION_ID,
+                kind = ReplyNotificationTracker.KIND_REPLY,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = "comp-37",
+                textSnippet = "Reply 37",
+                generation = 37L,
+                timestamp = System.currentTimeMillis(),
+            )
+        ReplyNotificationTracker.activeNotificationProvider = { activeInfo }
+
+        // Recover and cancel 37
+        assertTrue(ReplyNotificationTracker.onMessageVisible(context, "default", "session", "comp-37"))
+
+        // Post action
+        val actionNotif = mockk<Notification>()
+        assertTrue(ReplyNotificationTracker.postActionNotification(context, actionNotif))
+
+        // Register new reply
+        val newGen = ReplyNotificationTracker.registerPendingReply("default", "session", "comp-39", "Reply 39")
+        assertTrue("New generation must strictly exceed 37 and action tombstone", newGen > 38L)
+
+        val replyNotif = mockk<Notification>()
+        assertTrue(ReplyNotificationTracker.postReplyNotification(context, replyNotif, newGen))
+    }
+
+    @Test
+    fun alreadyResolvedServerIdBindsOnlyTheExactRowAmongShortDuplicates() {
+        ReplyNotificationTracker.resetForTest()
+        val activeInfo =
+            ActiveReplyInfo(
+                id = ChatNotificationService.PENDING_NOTIFICATION_ID,
+                kind = ReplyNotificationTracker.KIND_REPLY,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = "comp-newest-done",
+                serverMessageId = 2,
+                textSnippet = "Done",
+                generation = 5L,
+                timestamp = System.currentTimeMillis(),
+            )
+        ReplyNotificationTracker.activeNotificationProvider = { activeInfo }
+
+        // Two identical "Done" rows. The durable id (row 2) is what decides —
+        // there is no server row timestamp comparison anywhere in the mapper.
+        val history =
+            listOf(
+                SessionMessage(
+                    id = 1,
+                    role = "assistant",
+                    content = JsonPrimitive("Done"),
+                ),
+                SessionMessage(
+                    id = 2,
+                    role = "assistant",
+                    content = JsonPrimitive("Done"),
+                ),
+            )
+
+        val mapped =
+            mapServerMessages("session", history, 0, true, emptyList(), isPagingOlder = false, context = context)
+        assertEquals("Older message must have null completionId", null, mapped[0].completionId)
+        assertEquals("Newest message must receive target completionId", "comp-newest-done", mapped[1].completionId)
+
+        // Showing ONLY the older Done must NOT cancel the notification
+        val cancelledOld =
+            ReplyNotificationTracker.onMessageVisible(
+                context = context,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = mapped[0].completionId,
+            )
+        assertFalse("Viewing older duplicate message must NOT cancel notification", cancelledOld)
+        verify(exactly = 0) { manager.cancel(ChatNotificationService.PENDING_NOTIFICATION_ID) }
+
+        // Showing the newest Done MUST cancel the notification
+        val cancelledNew =
+            ReplyNotificationTracker.onMessageVisible(
+                context = context,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = mapped[1].completionId,
+            )
+        assertTrue("Viewing newest message must cancel notification", cancelledNew)
+        verify(exactly = 1) { manager.cancel(ChatNotificationService.PENDING_NOTIFICATION_ID) }
+    }
+
+    @Test
+    fun alreadyResolvedServerIdIgnoresSharedHundredCharacterPrefix() {
+        ReplyNotificationTracker.resetForTest()
+        val textPrefix = "x".repeat(100)
+        val text1 = textPrefix + "A"
+        val text2 = textPrefix + "B"
+        val activeInfo =
+            ActiveReplyInfo(
+                id = ChatNotificationService.PENDING_NOTIFICATION_ID,
+                kind = ReplyNotificationTracker.KIND_REPLY,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = "comp-long-2",
+                serverMessageId = 10,
+                textSnippet = text2.take(100),
+                generation = 5L,
+                timestamp = System.currentTimeMillis(),
+            )
+        ReplyNotificationTracker.activeNotificationProvider = { activeInfo }
+
+        val history =
+            listOf(
+                SessionMessage(
+                    id = 10,
+                    role = "assistant",
+                    content = JsonPrimitive(text1),
+                ),
+                SessionMessage(
+                    id = 20,
+                    role = "assistant",
+                    content = JsonPrimitive(text2),
+                ),
+            )
+
+        val mapped =
+            mapServerMessages("session", history, 0, true, emptyList(), isPagingOlder = false, context = context)
+        assertEquals("comp-long-2", mapped[0].completionId)
+        assertEquals(null, mapped[1].completionId)
+
+        assertTrue(
+            ReplyNotificationTracker.onMessageVisible(
+                context,
+                "default",
+                "session",
+                mapped[0].completionId,
+            ),
+        )
+        assertFalse(
+            ReplyNotificationTracker.onMessageVisible(
+                context,
+                "default",
+                "session",
+                mapped[1].completionId,
+            ),
+        )
+    }
+
+    @Test
+    fun alreadyResolvedServerIdBindsMediaRowAndDismissesOnVisible() {
+        ReplyNotificationTracker.resetForTest()
+        val activeInfo =
+            ActiveReplyInfo(
+                id = ChatNotificationService.PENDING_NOTIFICATION_ID,
+                kind = ReplyNotificationTracker.KIND_REPLY,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = "comp-media-cold",
+                serverMessageId = 100,
+                textSnippet = "Here is the image MEDIA:/opt/hermes/image.png",
+                generation = 5L,
+                timestamp = System.currentTimeMillis(),
+            )
+        ReplyNotificationTracker.activeNotificationProvider = { activeInfo }
+
+        val history =
+            listOf(
+                SessionMessage(
+                    id = 100,
+                    role = "assistant",
+                    content = JsonPrimitive("Here is the image MEDIA:/opt/hermes/image.png"),
+                ),
+            )
+
+        val mapped =
+            mapServerMessages("session", history, 0, true, emptyList(), isPagingOlder = false, context = context)
+        val row = mapped.single()
+        assertEquals("comp-media-cold", row.completionId)
+        assertEquals("Here is the image", row.content)
+
+        val dismissed =
+            ReplyNotificationTracker.onMessageVisible(
+                context = context,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = row.completionId,
+            )
+        assertTrue("Viewing hydrated MEDIA row must dismiss notification", dismissed)
+        verify { manager.cancel(ChatNotificationService.PENDING_NOTIFICATION_ID) }
+    }
+
+    @Test
+    fun alreadyResolvedServerIdBindsMediaOnlyRowAndDismissesOnVisible() {
+        ReplyNotificationTracker.resetForTest()
+        val activeInfo =
+            ActiveReplyInfo(
+                id = ChatNotificationService.PENDING_NOTIFICATION_ID,
+                kind = ReplyNotificationTracker.KIND_REPLY,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = "comp-media-only-cold",
+                serverMessageId = 100,
+                textSnippet = "MEDIA:/opt/hermes/image.png",
+                generation = 5L,
+                timestamp = System.currentTimeMillis(),
+            )
+        ReplyNotificationTracker.activeNotificationProvider = { activeInfo }
+
+        val history =
+            listOf(
+                SessionMessage(
+                    id = 100,
+                    role = "assistant",
+                    content = JsonPrimitive("MEDIA:/opt/hermes/image.png"),
+                ),
+            )
+
+        val mapped =
+            mapServerMessages("session", history, 0, true, emptyList(), isPagingOlder = false, context = context)
+        val row = mapped.single()
+        assertEquals("comp-media-only-cold", row.completionId)
+        assertEquals("", row.content)
+
+        val dismissed =
+            ReplyNotificationTracker.onMessageVisible(
+                context = context,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = row.completionId,
+            )
+        assertTrue("Viewing hydrated MEDIA-only row must dismiss notification", dismissed)
+        verify { manager.cancel(ChatNotificationService.PENDING_NOTIFICATION_ID) }
+    }
+
+    @Test
+    fun alreadyResolvedServerIdBindsOnlyTheExactMediaRowAmongDuplicates() {
+        ReplyNotificationTracker.resetForTest()
+        val activeInfo =
+            ActiveReplyInfo(
+                id = ChatNotificationService.PENDING_NOTIFICATION_ID,
+                kind = ReplyNotificationTracker.KIND_REPLY,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = "comp-media-dup-2",
+                serverMessageId = 1,
+                textSnippet = "MEDIA:/opt/hermes/image.png",
+                generation = 5L,
+                timestamp = System.currentTimeMillis(),
+            )
+        ReplyNotificationTracker.activeNotificationProvider = { activeInfo }
+
+        val history =
+            listOf(
+                SessionMessage(
+                    id = 1,
+                    role = "assistant",
+                    content = JsonPrimitive("MEDIA:/opt/hermes/image.png"),
+                ),
+                SessionMessage(
+                    id = 2,
+                    role = "assistant",
+                    content = JsonPrimitive("MEDIA:/opt/hermes/image.png"),
+                ),
+            )
+
+        val mapped =
+            mapServerMessages("session", history, 0, true, emptyList(), isPagingOlder = false, context = context)
+        assertEquals("comp-media-dup-2", mapped[0].completionId)
+        assertEquals(null, mapped[1].completionId)
+
+        assertTrue(
+            ReplyNotificationTracker.onMessageVisible(
+                context,
+                "default",
+                "session",
+                mapped[0].completionId,
+            ),
+        )
+        assertFalse(
+            ReplyNotificationTracker.onMessageVisible(
+                context,
+                "default",
+                "session",
+                mapped[1].completionId,
+            ),
+        )
+    }
+
+    /**
+     * The path production actually runs, end to end: the turn boundary armed
+     * before the prompt names exactly one REST row above it, that row id travels
+     * in the notification, only that row is hydrated with the completion id, and
+     * only that row dismisses the notification.
+     */
+    @Test
+    fun mobileTurnBoundaryResolvesTheExactRowThenOnlyThatRowDismisses() {
+        ReplyNotificationTracker.resetForTest()
+        TurnCorrelationTracker.resetForTest()
+        TurnCorrelationTracker.armBoundary("default", "session", 50)
+
+        val history =
+            listOf(
+                SessionMessage(id = 10, role = "assistant", content = JsonPrimitive("Done")),
+                SessionMessage(id = 51, role = "user", content = JsonPrimitive("next")),
+                SessionMessage(id = 52, role = "assistant", content = JsonPrimitive("Done")),
+            )
+        val resolved =
+            runBlocking {
+                correlateCompletedTurnRow(
+                    scopeId = "default",
+                    sessionId = "session",
+                    completionText = "Done",
+                    resolver = TurnRowResolver({ history }, listOf(0L)),
+                )
+            }
+        assertEquals("The historical duplicate below the boundary must not win", 52, resolved)
+
+        // The service stores that id in the notification extras; after process
+        // death the extras are all the tracker can recover from.
+        ReplyNotificationTracker.activeNotificationProvider = {
+            ActiveReplyInfo(
+                id = ChatNotificationService.PENDING_NOTIFICATION_ID,
+                kind = ReplyNotificationTracker.KIND_REPLY,
+                scopeId = "default",
+                sessionId = "session",
+                completionId = "comp-turn",
+                textSnippet = "Done",
+                generation = 5L,
+                timestamp = 0L,
+                serverMessageId = resolved,
+            )
+        }
+
+        val mapped =
+            mapServerMessages("session", history, 0, true, emptyList(), isPagingOlder = false, context = context)
+        assertEquals(listOf(null, null, "comp-turn"), mapped.map { it.completionId })
+
+        assertFalse(
+            "Viewing the older duplicate must not dismiss",
+            ReplyNotificationTracker.onMessageVisible(context, "default", "session", mapped[0].completionId),
+        )
+        assertTrue(
+            "Viewing the turn's own row must dismiss",
+            ReplyNotificationTracker.onMessageVisible(context, "default", "session", mapped[2].completionId),
+        )
+        verify(exactly = 1) { manager.cancel(ChatNotificationService.PENDING_NOTIFICATION_ID) }
+    }
+
+    @Test
+    fun unknownScopeMustNotAcknowledgeScopedReply() {
+        val target = ReplyNotificationTarget("other-profile", "session", "completion", 1L, "Done")
+        assertFalse(target.matches(null, "session", "completion"))
+    }
+}
diff --git a/app/src/test/java/com/m57/hermescontrol/ui/chat/components/ChatReadObserverTest.kt b/app/src/test/java/com/m57/hermescontrol/ui/chat/components/ChatReadObserverTest.kt
new file mode 100644
index 00000000..58b8ef72
--- /dev/null
+++ b/app/src/test/java/com/m57/hermescontrol/ui/chat/components/ChatReadObserverTest.kt
@@ -0,0 +1,198 @@
+package com.m57.hermescontrol.ui.chat.components
+
+import androidx.compose.foundation.lazy.LazyListItemInfo
+import androidx.compose.foundation.lazy.LazyListLayoutInfo
+import com.m57.hermescontrol.ui.chat.ChatMessage
+import com.m57.hermescontrol.ui.chat.MessageRole
+import io.mockk.every
+import io.mockk.mockk
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class ChatReadObserverTest {
+    private fun createMockItem(
+        key: Any,
+        offset: Int,
+        size: Int,
+    ): LazyListItemInfo {
+        val item = mockk<LazyListItemInfo>()
+        every { item.key } returns key
+        every { item.offset } returns offset
+        every { item.size } returns size
+        return item
+    }
+
+    private fun createMockLayoutInfo(
+        items: List<LazyListItemInfo>,
+        startOffset: Int = 0,
+        endOffset: Int = 1000,
+    ): LazyListLayoutInfo {
+        val layout = mockk<LazyListLayoutInfo>()
+        every { layout.visibleItemsInfo } returns items
+        every { layout.viewportStartOffset } returns startOffset
+        every { layout.viewportEndOffset } returns endOffset
+        return layout
+    }
+
+    @Test
+    fun `returns empty when visible items or messages are empty`() {
+        val layout = createMockLayoutInfo(emptyList())
+        val msg =
+            ChatMessage(
+                id = "msg-1",
+                role = MessageRole.ASSISTANT,
+                content = "Hello",
+            )
+
+        assertTrue(ChatReadObserver.findVisibleAssistantMessages(layout, listOf(msg)).isEmpty())
+
+        val layoutWithItem = createMockLayoutInfo(listOf(createMockItem("prose-msg-1", 100, 50)))
+        assertTrue(ChatReadObserver.findVisibleAssistantMessages(layoutWithItem, emptyList()).isEmpty())
+    }
+
+    @Test
+    fun `identifies visible completed assistant messages`() {
+        val msg1 =
+            ChatMessage(
+                id = "msg-1",
+                role = MessageRole.ASSISTANT,
+                content = "Answer 1",
+                completionId = "comp-1",
+            )
+        val msg2 =
+            ChatMessage(
+                id = "msg-2",
+                role = MessageRole.ASSISTANT,
+                content = "Answer 2",
+                completionId = "comp-2",
+            )
+
+        val items =
+            listOf(
+                createMockItem("prose-msg-1", 100, 200),
+                createMockItem("prose-msg-2", 400, 250),
+            )
+        val layout = createMockLayoutInfo(items)
+
+        val visible = ChatReadObserver.findVisibleAssistantMessages(layout, listOf(msg1, msg2))
+        assertEquals(2, visible.size)
+        assertEquals("msg-1", visible[0].id)
+        assertEquals("msg-2", visible[1].id)
+    }
+
+    @Test
+    fun `ignores non-prose items like user bubbles, reasoning cards, and tool rows`() {
+        val assistant =
+            ChatMessage(
+                id = "ast-1",
+                role = MessageRole.ASSISTANT,
+                content = "Done",
+            )
+        val user =
+            ChatMessage(
+                id = "usr-1",
+                role = MessageRole.USER,
+                content = "Question",
+            )
+
+        val items =
+            listOf(
+                createMockItem("user-usr-1", 50, 100),
+                createMockItem("reasoning-ast-1", 150, 100),
+                createMockItem("tool-tool-1", 250, 100),
+                createMockItem("prose-ast-1", 350, 100),
+            )
+        val layout = createMockLayoutInfo(items)
+
+        val visible = ChatReadObserver.findVisibleAssistantMessages(layout, listOf(assistant, user))
+        assertEquals(1, visible.size)
+        assertEquals("ast-1", visible.single().id)
+    }
+
+    @Test
+    fun `ignores streaming assistant messages`() {
+        val streaming =
+            ChatMessage(
+                id = "stream-1",
+                role = MessageRole.ASSISTANT,
+                content = "typing...",
+                isStreaming = true,
+            )
+
+        val items = listOf(createMockItem("prose-stream-1", 100, 200))
+        val layout = createMockLayoutInfo(items)
+
+        val visible = ChatReadObserver.findVisibleAssistantMessages(layout, listOf(streaming))
+        assertTrue(visible.isEmpty())
+    }
+
+    @Test
+    fun `filters out items outside viewport bounds`() {
+        val msgAbove =
+            ChatMessage(
+                id = "above",
+                role = MessageRole.ASSISTANT,
+                content = "Above viewport",
+            )
+        val msgInside =
+            ChatMessage(
+                id = "inside",
+                role = MessageRole.ASSISTANT,
+                content = "Inside viewport",
+            )
+        val msgBelow =
+            ChatMessage(
+                id = "below",
+                role = MessageRole.ASSISTANT,
+                content = "Below viewport",
+            )
+
+        // Viewport is 200..800
+        val items =
+            listOf(
+                // Fully above: offset -100, size 100 -> offset + size = 0 <= 200
+                createMockItem("prose-above", -100, 100),
+                // Inside: offset 300, size 150
+                createMockItem("prose-inside", 300, 150),
+                // Fully below: offset 900, size 100 >= 800
+                createMockItem("prose-below", 900, 100),
+            )
+        val layout = createMockLayoutInfo(items, startOffset = 200, endOffset = 800)
+
+        val visible = ChatReadObserver.findVisibleAssistantMessages(layout, listOf(msgAbove, msgInside, msgBelow))
+        assertEquals(1, visible.size)
+        assertEquals("inside", visible.single().id)
+    }
+
+    @Test
+    fun `includes partially visible messages at viewport edges`() {
+        val topPartial =
+            ChatMessage(
+                id = "top",
+                role = MessageRole.ASSISTANT,
+                content = "Top edge",
+            )
+        val bottomPartial =
+            ChatMessage(
+                id = "bottom",
+                role = MessageRole.ASSISTANT,
+                content = "Bottom edge",
+            )
+
+        // Viewport 100..500
+        val items =
+            listOf(
+                // Crosses top boundary: offset 50, size 100 (bottom is 150 > 100)
+                createMockItem("prose-top", 50, 100),
+                // Crosses bottom boundary: offset 450, size 100 (top is 450 < 500)
+                createMockItem("prose-bottom", 450, 100),
+            )
+        val layout = createMockLayoutInfo(items, startOffset = 100, endOffset = 500)
+
+        val visible = ChatReadObserver.findVisibleAssistantMessages(layout, listOf(topPartial, bottomPartial))
+        assertEquals(2, visible.size)
+        assertEquals("top", visible[0].id)
+        assertEquals("bottom", visible[1].id)
+    }
+}