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 e8cfd3bc..b6161f6d 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
@@ -1,17 +1,23 @@
 package com.m57.hermescontrol.ui.chat.components
 
 import android.Manifest
+import android.content.ClipData
 import android.content.pm.PackageManager
 import android.os.Build
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.lazy.LazyListState
+import androidx.compose.material3.SnackbarDuration
 import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.SnackbarResult
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.snapshotFlow
+import androidx.compose.ui.platform.ClipEntry
+import androidx.compose.ui.platform.LocalClipboard
 import androidx.compose.ui.platform.LocalContext
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.Lifecycle
@@ -19,6 +25,7 @@ import androidx.lifecycle.LifecycleEventObserver
 import androidx.lifecycle.compose.LocalLifecycleOwner
 import androidx.lifecycle.repeatOnLifecycle
 import com.m57.hermescontrol.NavigationController
+import com.m57.hermescontrol.R
 import com.m57.hermescontrol.data.ws.ConnectionStatus
 import com.m57.hermescontrol.notification.ReplyNotificationTracker
 import com.m57.hermescontrol.notification.correlationScopeId
@@ -28,6 +35,7 @@ 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
+import kotlinx.coroutines.launch
 
 @Composable
 fun ChatLifecycleEffects(
@@ -137,10 +145,24 @@ fun ChatLifecycleEffects(
     }
 
     // Show error as snackbar
+    val clipboard = LocalClipboard.current
+    val copyLabel = context.getString(R.string.action_copy_error)
+    // Own scope + immediate clear: a later `errorMessage = null` elsewhere must not cancel a visible popup.
+    val snackbarScope = rememberCoroutineScope()
     LaunchedEffect(errorMessage) {
         errorMessage?.let { error ->
-            snackbarHostState.showSnackbar(error)
             viewModel.clearError()
+            snackbarScope.launch {
+                val result =
+                    snackbarHostState.showSnackbar(
+                        error,
+                        actionLabel = copyLabel,
+                        duration = SnackbarDuration.Long,
+                    )
+                if (result == SnackbarResult.ActionPerformed) {
+                    clipboard.setClipEntry(ClipEntry(ClipData.newPlainText(null, error)))
+                }
+            }
         }
     }
 
diff --git a/app/src/main/java/com/m57/hermescontrol/ui/common/StateViews.kt b/app/src/main/java/com/m57/hermescontrol/ui/common/StateViews.kt
index 4f9bd413..027bce0d 100644
--- a/app/src/main/java/com/m57/hermescontrol/ui/common/StateViews.kt
+++ b/app/src/main/java/com/m57/hermescontrol/ui/common/StateViews.kt
@@ -1,5 +1,6 @@
 package com.m57.hermescontrol.ui.common
 
+import android.content.ClipData
 import androidx.compose.animation.core.FastOutSlowInEasing
 import androidx.compose.animation.core.RepeatMode
 import androidx.compose.animation.core.animateFloat
@@ -22,6 +23,7 @@ import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ContentCopy
 import androidx.compose.material.icons.filled.Inbox
 import androidx.compose.material.icons.filled.Refresh
 import androidx.compose.material3.Button
@@ -30,8 +32,10 @@ import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -39,6 +43,8 @@ import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Shape
 import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.platform.ClipEntry
+import androidx.compose.ui.platform.LocalClipboard
 import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.testTag
@@ -48,6 +54,7 @@ import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import com.m57.hermescontrol.R
 import com.m57.hermescontrol.theme.LocalSpacing
+import kotlinx.coroutines.launch
 
 // Unified loading / error / empty / skeleton placeholders so every screen
 // shares the same visual language.
@@ -96,6 +103,8 @@ fun ErrorState(
     modifier: Modifier = Modifier,
 ) {
     val spacing = LocalSpacing.current
+    val clipboard = LocalClipboard.current
+    val scope = rememberCoroutineScope()
     Column(
         modifier =
             modifier
@@ -117,6 +126,20 @@ fun ErrorState(
             textAlign = TextAlign.Center,
             style = MaterialTheme.typography.bodyMedium,
         )
+        TextButton(
+            onClick = {
+                scope.launch { clipboard.setClipEntry(ClipEntry(ClipData.newPlainText(null, message))) }
+            },
+            modifier = Modifier.testTag("error_copy_button"),
+        ) {
+            Icon(
+                imageVector = Icons.Filled.ContentCopy,
+                contentDescription = null,
+                modifier = Modifier.size(16.dp),
+            )
+            Spacer(modifier = Modifier.size(spacing.xs))
+            Text(stringResource(R.string.action_copy_error))
+        }
         if (onRetry != null) {
             Spacer(modifier = Modifier.height(spacing.md))
             Button(
diff --git a/app/src/main/res/values-ar/strings.xml b/app/src/main/res/values-ar/strings.xml
index 6a328570..8e923ad0 100644
--- a/app/src/main/res/values-ar/strings.xml
+++ b/app/src/main/res/values-ar/strings.xml
@@ -19,6 +19,7 @@
 <string name="chat_next_match_desc">النتيجة التالية</string>
 <string name="chat_close_search_desc">إغلاق البحث</string>
 <string name="action_retry">إعادة المحاولة</string>
+<string name="action_copy_error">نسخ الخطأ</string>
 <string name="action_cancel">إلغاء</string>
 <string name="action_confirm">تأكيد</string>
 <string name="action_clear">مسح</string>
diff --git a/app/src/main/res/values-ko/strings.xml b/app/src/main/res/values-ko/strings.xml
index fabaaf82..ee02ab7a 100644
--- a/app/src/main/res/values-ko/strings.xml
+++ b/app/src/main/res/values-ko/strings.xml
@@ -22,6 +22,7 @@
 
     <!-- Actions -->
     <string name="action_retry">재시도</string>
+    <string name="action_copy_error">오류 복사</string>
     <string name="action_cancel">취소</string>
     <string name="action_clear">지우기</string>
     <string name="action_ok">확인</string>
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index 67868a7b..6944c427 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -19,6 +19,7 @@
     <string name="chat_next_match_desc">下一个匹配</string>
     <string name="chat_close_search_desc">关闭搜索</string>
     <string name="action_retry">重试</string>
+    <string name="action_copy_error">复制错误</string>
     <string name="action_cancel">取消</string>
     <string name="action_confirm">确认</string>
     <string name="action_clear">清除</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 2bca4211..eb91aa7a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -29,6 +29,7 @@
 
     <!-- Actions -->
     <string name="action_retry">Retry</string>
+    <string name="action_copy_error">Copy error</string>
     <string name="action_cancel">Cancel</string>
     <string name="action_confirm">Confirm</string>
     <string name="action_clear">Clear</string>