diff --git a/app/src/main/java/com/m57/hermescontrol/data/model/ModelAssignment.kt b/app/src/main/java/com/m57/hermescontrol/data/model/ModelAssignment.kt
index ec25c2af..3a51c9b4 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/model/ModelAssignment.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/model/ModelAssignment.kt
@@ -25,14 +25,20 @@ data class MainModelAssignment(
 data class MoaModelSlot(
     val provider: String,
     val model: String,
+    val reasoning_effort: String? = null,
+    val enabled: Boolean = true,
 )
 
 @Serializable
 data class MoaConfigPreset(
     val reference_models: List<MoaModelSlot>,
     val aggregator: MoaModelSlot,
-    val reference_temperature: Double = 0.7,
-    val aggregator_temperature: Double = 0.3,
+    // null = omitted from API calls (provider default); the backend sends null when unset.
+    val reference_temperature: Double? = null,
+    val aggregator_temperature: Double? = null,
+    val reference_timeout: Double? = null,
+    val degraded_reference_policy: String = "loud",
+    val fanout: String? = null,
     val max_tokens: Int = 4096,
     val enabled: Boolean = true,
 )
@@ -44,8 +50,12 @@ data class MoaConfigResponse(
     val presets: Map<String, MoaConfigPreset> = emptyMap(),
     val reference_models: List<MoaModelSlot> = emptyList(),
     val aggregator: MoaModelSlot = MoaModelSlot("", ""),
-    val reference_temperature: Double = 0.7,
-    val aggregator_temperature: Double = 0.3,
+    // null = omitted from API calls (provider default); the backend sends null when unset.
+    val reference_temperature: Double? = null,
+    val aggregator_temperature: Double? = null,
+    val reference_timeout: Double? = null,
+    val degraded_reference_policy: String = "loud",
+    val fanout: String? = null,
     val max_tokens: Int = 4096,
     val enabled: Boolean = true,
 )
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 b6161f6d..da4353e4 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
@@ -19,6 +19,7 @@ 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.compose.ui.res.stringResource
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
@@ -146,7 +147,7 @@ fun ChatLifecycleEffects(
 
     // Show error as snackbar
     val clipboard = LocalClipboard.current
-    val copyLabel = context.getString(R.string.action_copy_error)
+    val copyLabel = stringResource(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) {
diff --git a/app/src/test/java/com/m57/hermescontrol/data/model/ModelSerializationTest.kt b/app/src/test/java/com/m57/hermescontrol/data/model/ModelSerializationTest.kt
index 2fda9252..898e1dd4 100644
--- a/app/src/test/java/com/m57/hermescontrol/data/model/ModelSerializationTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/data/model/ModelSerializationTest.kt
@@ -622,4 +622,33 @@ class ModelSerializationTest {
             json.decodeFromString<ToggleSkillRequest>(jsonInput)
         }
     }
+
+    @Test
+    fun moaConfigDecodesNullTemperaturesAndNewFields() {
+        val payload =
+            """
+            {"default_preset":"default","active_preset":"","privacy_filter":"",
+             "presets":{"default":{"enabled":true,
+               "reference_models":[{"provider":"openrouter","model":"x/y","enabled":false,"reasoning_effort":"high"}],
+               "aggregator":{"provider":"openrouter","model":"a/b"},
+               "reference_temperature":null,"aggregator_temperature":null,
+               "reference_timeout":null,"degraded_reference_policy":"silent","fanout":"every_n:3"}},
+             "reference_models":[{"provider":"openrouter","model":"x/y","enabled":true}],
+             "aggregator":{"provider":"openrouter","model":"a/b"},
+             "reference_temperature":null,"aggregator_temperature":null,
+             "reference_timeout":null,"degraded_reference_policy":"silent","fanout":"every_n:3","enabled":true}
+            """.trimIndent()
+        val cfg = json.decodeFromString<MoaConfigResponse>(payload)
+        assertNull(cfg.reference_temperature)
+        assertNull(cfg.aggregator_temperature)
+        assertEquals("every_n:3", cfg.fanout)
+        val preset = cfg.presets.getValue("default")
+        assertEquals("silent", preset.degraded_reference_policy)
+        assertEquals(false, preset.reference_models.first().enabled)
+        assertEquals("high", preset.reference_models.first().reasoning_effort)
+        // Round-trip keeps the non-default knobs so a save doesn't reset them.
+        val back = json.encodeToString(cfg)
+        assertTrue(back.contains("every_n:3"))
+        assertTrue(back.contains("silent"))
+    }
 }