feat(bots): add multi-agent group chat collaboration room (#998)

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/Navigation.kt

@@ -155,6 +155,14 @@ private fun appEntryProvider(
             onBack = { NavigationController.goBack() },
         )
     }
+
+    // ── Multi-Agent Group Chat Room ─────────────────────────────────────
+    entry<GroupChatKey> { key ->
+        com.m57.hermescontrol.ui.bots.group.GroupChatScreen(
+            groupName = key.groupName,
+            onBack = { NavigationController.goBack() },
+        )
+    }
 }
 
 @Composable

app/src/main/java/com/m57/hermescontrol/NavigationKeys.kt

@@ -23,6 +23,10 @@ import kotlinx.serialization.Serializable
 
 @Serializable data object BotsScreen : NavKey
 
+@Serializable data class GroupChatKey(
+    val groupName: String,
+) : NavKey
+
 @Serializable data object ToolsetsScreen : NavKey
 
 @Serializable data class ToolsetDetailKey(

app/src/main/java/com/m57/hermescontrol/data/model/Profile.kt

@@ -3,7 +3,10 @@ package com.m57.hermescontrol.data.model
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
 import kotlinx.serialization.json.decodeFromJsonElement
+import kotlinx.serialization.json.jsonPrimitive
 
 @Serializable
 data class ProfilesResponse(
@@ -121,12 +124,42 @@ data class GroupChatSyncSnapshot(
 
 @Serializable
 data class GroupChatRoomMeta(
-    val id: String,
+    val id: String? = null,
+    val roomId: String? = null,
     val name: String? = null,
-    val members: List<String>? = null,
+    val members: List<JsonElement>? = null,
     val picture: String? = null,
+    val image: String? = null,
+    val log: List<GroupChatSyncLogEntry>? = null,
+    val revision: Long? = null,
     val updatedAt: Long? = null,
     val createdAt: Long? = null,
+) {
+    val memberNames: List<String>
+        get() =
+            members?.mapNotNull { el ->
+                when (el) {
+                    is JsonPrimitive -> el.content
+                    is JsonObject -> el["name"]?.jsonPrimitive?.content
+                    else -> null
+                }
+            }.orEmpty()
+}
+
+@Serializable
+data class GroupChatSyncLogEntry(
+    val id: String? = null,
+    val from: GroupChatSyncFrom? = null,
+    val text: String? = null,
+    val at: Long? = null,
+    val thread: String? = null,
+)
+
+@Serializable
+data class GroupChatSyncFrom(
+    val kind: String? = null, // "user" | "member"
+    val name: String? = null,
+    val source: String? = null,
 )
 
 @Serializable

app/src/main/java/com/m57/hermescontrol/ui/bots/BotsScreen.kt

@@ -400,20 +400,9 @@ fun BotsScreen(
                                         group = group,
                                         onClick = {
                                             if (group.members.isNotEmpty()) {
-                                                scope.launch {
-                                                    val primary = group.members.first()
-                                                    viewModel.selectBot(primary)
-                                                    val canonicalId =
-                                                        primary.canonical_session?.resolved_id
-                                                            ?: primary.canonical_session?.id
-                                                    if (!canonicalId.isNullOrBlank()) {
-                                                        NavigationController.openChatSession(canonicalId)
-                                                    } else {
-                                                        NavigationController.navigateTo(
-                                                            com.m57.hermescontrol.ChatScreen,
-                                                        )
-                                                    }
-                                                }
+                                                NavigationController.navigateTo(
+                                                    com.m57.hermescontrol.GroupChatKey(group.name),
+                                                )
                                             }
                                         },
                                         onDisbandClick = {

app/src/main/java/com/m57/hermescontrol/ui/bots/CreateBotDialog.kt

@@ -3,6 +3,7 @@ package com.m57.hermescontrol.ui.bots
 import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -142,9 +143,14 @@ fun CreateBotDialog(
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                 )
 
+                Spacer(modifier = Modifier.height(6.dp))
+
                 Row(
-                    modifier = Modifier.fillMaxWidth(),
-                    horizontalArrangement = Arrangement.spacedBy(6.dp),
+                    modifier =
+                        Modifier
+                            .fillMaxWidth()
+                            .horizontalScroll(rememberScrollState()),
+                    horizontalArrangement = Arrangement.spacedBy(8.dp),
                 ) {
                     AVAILABLE_SHAPES.forEach { shape ->
                         FilterChip(

app/src/main/java/com/m57/hermescontrol/ui/bots/EditBotBottomSheet.kt

@@ -3,6 +3,7 @@ package com.m57.hermescontrol.ui.bots
 import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -173,9 +174,14 @@ fun EditBotBottomSheet(
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
 
+            Spacer(modifier = Modifier.height(6.dp))
+
             Row(
-                modifier = Modifier.fillMaxWidth(),
-                horizontalArrangement = Arrangement.spacedBy(6.dp),
+                modifier =
+                    Modifier
+                        .fillMaxWidth()
+                        .horizontalScroll(rememberScrollState()),
+                horizontalArrangement = Arrangement.spacedBy(8.dp),
             ) {
                 AVAILABLE_SHAPES.forEach { shape ->
                     FilterChip(

app/src/main/java/com/m57/hermescontrol/ui/bots/group/GroupChatModels.kt

@@ -0,0 +1,111 @@
+package com.m57.hermescontrol.ui.bots.group
+
+import com.m57.hermescontrol.data.model.BotAvatarMeta
+import com.m57.hermescontrol.data.model.ProfileInfo
+
+/**
+ * Single message entry in a multi-agent group room.
+ */
+data class GroupChatMessage(
+    val id: String,
+    val senderName: String,
+    val senderDisplayName: String,
+    val isUser: Boolean,
+    val avatarMeta: BotAvatarMeta? = null,
+    val text: String,
+    val timestamp: Long = System.currentTimeMillis(),
+    val isStreaming: Boolean = false,
+    val thread: String? = null,
+)
+
+/**
+ * Pure helper for mention extraction and responder resolution matching Desktop parity.
+ */
+object GroupChatMentions {
+    data class MentionResult(
+        val isEveryone: Boolean,
+        val mentionedBots: Set<String>,
+    )
+
+    /**
+     * Parse `@botname`, `@all`, `@everyone` from text against the member roster.
+     */
+    fun parseMentions(
+        text: String,
+        members: List<ProfileInfo>,
+    ): MentionResult {
+        val lowerText = text.lowercase()
+        val isEveryone = lowerText.contains("@all") || lowerText.contains("@everyone")
+
+        val mentioned = mutableSetOf<String>()
+        for (member in members) {
+            val handle = member.name.lowercase()
+            val titleHandle = member.effectiveTitle.lowercase().replace(" ", "")
+            if (lowerText.contains("@$handle") || lowerText.contains("@$titleHandle")) {
+                mentioned.add(member.name)
+            }
+        }
+
+        return MentionResult(
+            isEveryone = isEveryone,
+            mentionedBots = mentioned,
+        )
+    }
+
+    /**
+     * Determine which bots should take a turn. If @all or no specific mention, all members participate.
+     */
+    fun resolveResponders(
+        text: String,
+        members: List<ProfileInfo>,
+    ): List<ProfileInfo> {
+        val parsed = parseMentions(text, members)
+        return if (parsed.isEveryone || parsed.mentionedBots.isEmpty()) {
+            members
+        } else {
+            members.filter { parsed.mentionedBots.contains(it.name) }
+        }
+    }
+
+    /**
+     * Build the room delta prompt injected into each bot's session.
+     */
+    fun buildTurnPrompt(
+        groupName: String,
+        viewer: ProfileInfo,
+        peers: List<ProfileInfo>,
+        recentLog: List<GroupChatMessage>,
+    ): String {
+        val viewerHandle = viewer.name
+        val peerNames = peers.joinToString(", ") { "@${it.name}" }
+        val lines =
+            recentLog.takeLast(10).joinToString("\n") { msg ->
+                val speaker = if (msg.isUser) "User" else "@${msg.senderName}"
+                "  $speaker: ${msg.text}"
+            }
+
+        val lastUserMsg = recentLog.lastOrNull { it.isUser }?.text.orEmpty()
+        val parsed = parseMentions(lastUserMsg, peers + viewer)
+        val isDirectOrAll = parsed.isEveryone || parsed.mentionedBots.contains(viewer.name)
+
+        val actionGuidance =
+            if (isDirectOrAll) {
+                "- You were explicitly addressed (via @$viewerHandle or @all). Do NOT pass — reply conversationally with your greeting, insight, answer, or status."
+            } else {
+                "- If you have nothing new to add, reply with exactly \"(pass)\". Passing is good and lets the conversation settle."
+            }
+
+        return """
+[Group chat: "$groupName"] You are @$viewerHandle, one participant in a group chat with $peerNames and the user.
+
+Recent messages in the room:
+$lines
+
+Rules for this room:
+- Reply with ONE conversational message (1-3 sentences).
+$actionGuidance
+- Mention a teammate as @name if you want to pull them in.
+- Your reply goes to the room verbatim — no preamble.
+            """.trimIndent()
+    }
+}

app/src/main/java/com/m57/hermescontrol/ui/bots/group/GroupChatScreen.kt

@@ -0,0 +1,341 @@
+package com.m57.hermescontrol.ui.bots.group
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.imePadding
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.BasicTextField
+import androidx.compose.foundation.text.KeyboardActions
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.Send
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.IconButtonDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.onFocusChanged
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.m57.hermescontrol.R
+import com.m57.hermescontrol.ui.chat.MarkdownText
+import com.m57.hermescontrol.ui.common.BotAvatar
+import com.m57.hermescontrol.ui.common.EmptyState
+import com.m57.hermescontrol.ui.common.HermesScaffold
+import com.m57.hermescontrol.ui.common.NavIcon
+
+@Composable
+fun GroupChatScreen(
+    groupName: String,
+    onBack: () -> Unit,
+    modifier: Modifier = Modifier,
+    viewModel: GroupChatViewModel = viewModel { GroupChatViewModel() },
+) {
+    val state by viewModel.uiState.collectAsState()
+    val listState = rememberLazyListState()
+    var inputFieldValue by rememberSaveable(stateSaver = TextFieldValue.Saver) {
+        mutableStateOf(TextFieldValue(""))
+    }
+    var isFocused by remember { mutableStateOf(false) }
+
+    val handleSend = {
+        val text = inputFieldValue.text
+        if (text.isNotBlank()) {
+            viewModel.sendMessage(text)
+            inputFieldValue = TextFieldValue("")
+        }
+    }
+
+    LaunchedEffect(groupName) {
+        viewModel.setGroup(groupName)
+    }
+
+    LaunchedEffect(state.messages.size) {
+        if (state.messages.isNotEmpty()) {
+            listState.animateScrollToItem(state.messages.size - 1)
+        }
+    }
+
+    HermesScaffold(
+        title = {
+            Column {
+                Text(
+                    text = state.groupName.ifBlank { groupName },
+                    style = MaterialTheme.typography.titleMedium,
+                    fontWeight = FontWeight.Bold,
+                )
+                if (state.members.isNotEmpty()) {
+                    Text(
+                        text = stringResource(R.string.group_chat_members_count, state.members.size),
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
+            }
+        },
+        navigationIcon = NavIcon.Back(onBack),
+        modifier = modifier,
+    ) {
+        Column(
+            modifier =
+                Modifier
+                    .fillMaxSize()
+                    .padding(bottom = 8.dp)
+                    .imePadding(),
+        ) {
+            when {
+                state.isLoading -> {
+                    Box(
+                        modifier =
+                            Modifier
+                                .weight(1f)
+                                .fillMaxWidth(),
+                        contentAlignment = Alignment.Center,
+                    ) {
+                        CircularProgressIndicator(modifier = Modifier.size(32.dp))
+                    }
+                }
+
+                state.messages.isEmpty() -> {
+                    EmptyState(
+                        title = stringResource(R.string.group_chat_empty_title),
+                        subtitle = stringResource(R.string.group_chat_empty_subtitle),
+                        modifier =
+                            Modifier
+                                .weight(1f)
+                                .fillMaxWidth(),
+                    )
+                }
+
+                else -> {
+                    LazyColumn(
+                        state = listState,
+                        modifier =
+                            Modifier
+                                .weight(1f)
+                                .fillMaxWidth(),
+                        contentPadding = PaddingValues(horizontal = 16.dp, vertical = 8.dp),
+                        verticalArrangement = Arrangement.spacedBy(12.dp),
+                    ) {
+                        items(
+                            items = state.messages,
+                            key = { it.id },
+                        ) { message ->
+                            GroupMessageCard(message = message)
+                        }
+
+                        state.activeSpeaker?.let { speaker ->
+                            item(key = "active_speaker") {
+                                Row(
+                                    modifier = Modifier.padding(start = 8.dp, top = 4.dp),
+                                    verticalAlignment = Alignment.CenterVertically,
+                                ) {
+                                    CircularProgressIndicator(
+                                        modifier = Modifier.size(14.dp),
+                                        strokeWidth = 2.dp,
+                                    )
+                                    Spacer(modifier = Modifier.width(8.dp))
+                                    Text(
+                                        text = stringResource(R.string.group_chat_thinking, speaker),
+                                        style = MaterialTheme.typography.bodySmall,
+                                        color = MaterialTheme.colorScheme.primary,
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            // ── COMPOSER (uses TextFieldValue + embedded Send button matching ChatComposer) ──
+            Surface(
+                modifier =
+                    Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = 12.dp, vertical = 4.dp),
+                shape = RoundedCornerShape(20.dp),
+                border =
+                    BorderStroke(
+                        width = if (isFocused) 2.dp else 1.dp,
+                        color =
+                            if (isFocused) {
+                                MaterialTheme.colorScheme.primary
+                            } else {
+                                MaterialTheme.colorScheme.outline.copy(alpha = 0.5f)
+                            },
+                    ),
+                color = MaterialTheme.colorScheme.surface,
+            ) {
+                Row(
+                    modifier =
+                        Modifier
+                            .fillMaxWidth()
+                            .padding(start = 14.dp, end = 4.dp, top = 6.dp, bottom = 6.dp),
+                    verticalAlignment = Alignment.CenterVertically,
+                ) {
+                    Box(modifier = Modifier.weight(1f)) {
+                        if (inputFieldValue.text.isEmpty()) {
+                            Text(
+                                text =
+                                    stringResource(
+                                        R.string.group_chat_composer_hint,
+                                        state.groupName.ifBlank { groupName },
+                                    ),
+                                style = MaterialTheme.typography.bodyMedium,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.6f),
+                            )
+                        }
+                        BasicTextField(
+                            value = inputFieldValue,
+                            onValueChange = { inputFieldValue = it },
+                            modifier =
+                                Modifier
+                                    .fillMaxWidth()
+                                    .heightIn(min = 24.dp, max = 120.dp)
+                                    .onFocusChanged { isFocused = it.isFocused }
+                                    .testTag("group_chat_input"),
+                            textStyle =
+                                MaterialTheme.typography.bodyMedium.copy(
+                                    color = MaterialTheme.colorScheme.onSurface,
+                                ),
+                            singleLine = false,
+                            maxLines = 4,
+                            cursorBrush = SolidColor(MaterialTheme.colorScheme.primary),
+                            keyboardOptions = KeyboardOptions(imeAction = ImeAction.Send),
+                            keyboardActions = KeyboardActions(onSend = { handleSend() }),
+                        )
+                    }
+
+                    Spacer(modifier = Modifier.width(4.dp))
+
+                    IconButton(
+                        onClick = handleSend,
+                        enabled = inputFieldValue.text.isNotBlank(),
+                        colors = IconButtonDefaults.filledTonalIconButtonColors(),
+                        modifier =
+                            Modifier
+                                .size(36.dp)
+                                .testTag("group_chat_send_button"),
+                    ) {
+                        Icon(
+                            imageVector = Icons.AutoMirrored.Filled.Send,
+                            contentDescription = "Send",
+                            modifier = Modifier.size(18.dp),
+                        )
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun GroupMessageCard(
+    message: GroupChatMessage,
+    modifier: Modifier = Modifier,
+) {
+    if (message.isUser) {
+        Row(
+            modifier = modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.End,
+        ) {
+            Surface(
+                shape = RoundedCornerShape(16.dp),
+                color = MaterialTheme.colorScheme.primary,
+                modifier = Modifier.fillMaxWidth(0.85f),
+            ) {
+                Column(modifier = Modifier.padding(12.dp)) {
+                    Text(
+                        text = message.text,
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onPrimary,
+                    )
+                }
+            }
+        }
+    } else {
+        Row(
+            modifier = modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.Start,
+        ) {
+            BotAvatar(
+                name = message.senderName,
+                avatar = message.avatarMeta,
+                size = 32.dp,
+                showPresence = false,
+            )
+            Spacer(modifier = Modifier.width(8.dp))
+            Surface(
+                shape = RoundedCornerShape(16.dp),
+                color = MaterialTheme.colorScheme.surfaceVariant,
+                modifier = Modifier.weight(1f, fill = false),
+            ) {
+                Column(modifier = Modifier.padding(12.dp)) {
+                    Text(
+                        text = message.senderDisplayName,
+                        style = MaterialTheme.typography.labelMedium,
+                        fontWeight = FontWeight.Bold,
+                        color = MaterialTheme.colorScheme.primary,
+                    )
+                    Spacer(modifier = Modifier.height(4.dp))
+                    if (message.isStreaming && message.text.isBlank()) {
+                        Row(
+                            verticalAlignment = Alignment.CenterVertically,
+                            modifier = Modifier.padding(vertical = 4.dp),
+                        ) {
+                            CircularProgressIndicator(
+                                modifier = Modifier.size(12.dp),
+                                strokeWidth = 1.5.dp,
+                                color = MaterialTheme.colorScheme.primary,
+                            )
+                            Spacer(modifier = Modifier.width(6.dp))
+                            Text(
+                                text = stringResource(R.string.group_chat_typing),
+                                style = MaterialTheme.typography.bodySmall,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.7f),
+                            )
+                        }
+                    } else if (message.text.isNotBlank()) {
+                        MarkdownText(
+                            text = message.text,
+                            textColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    }
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/m57/hermescontrol/ui/bots/group/GroupChatViewModel.kt

@@ -0,0 +1,578 @@
+package com.m57.hermescontrol.ui.bots.group
+
+import android.util.Log
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.m57.hermescontrol.data.model.GroupChatRoomMeta
+import com.m57.hermescontrol.data.model.GroupChatSyncFrom
+import com.m57.hermescontrol.data.model.GroupChatSyncLogEntry
+import com.m57.hermescontrol.data.model.GroupChatSyncSnapshot
+import com.m57.hermescontrol.data.model.ProfileInfo
+import com.m57.hermescontrol.data.model.ProfilesResponse
+import com.m57.hermescontrol.data.remote.ApiClient
+import com.m57.hermescontrol.data.remote.NetworkResult
+import com.m57.hermescontrol.data.remote.safeApiCall
+import com.m57.hermescontrol.data.session.ActiveSessionHolder
+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 kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withTimeoutOrNull
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.decodeFromJsonElement
+import kotlinx.serialization.json.jsonPrimitive
+import java.util.UUID
+
+data class GroupChatUiState(
+    val groupName: String = "",
+    val members: List<ProfileInfo> = emptyList(),
+    val messages: List<GroupChatMessage> = emptyList(),
+    val activeSpeaker: String? = null,
+    val isLoading: Boolean = true,
+    val errorMessage: String? = null,
+)
+
+data class MemberSession(
+    val runtimeSessionId: String,
+    val storedSessionId: String? = null,
+)
+
+class GroupChatViewModel(
+    private var groupName: String = "",
+    private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO,
+    private val json: Json = Json { ignoreUnknownKeys = true },
+) : ViewModel() {
+    private val _uiState = MutableStateFlow(GroupChatUiState(groupName = groupName))
+    val uiState: StateFlow<GroupChatUiState> = _uiState.asStateFlow()
+
+    // Map of bot.name -> active session info in this group
+    private val memberSessions = mutableMapOf<String, MemberSession>()
+
+    // In-flight turn completion deferreds keyed by session_id
+    private val inFlightTurns = mutableMapOf<String, CompletableDeferred<String>>()
+
+    // Map of session_id -> active streaming message ID
+    private val activeStreamMsgId = mutableMapOf<String, String>()
+
+    // Map of session_id -> bot profile
+    private val sessionToBot = mutableMapOf<String, ProfileInfo>()
+
+    init {
+        if (groupName.isNotBlank()) {
+            loadGroup()
+        }
+        observeWsEvents()
+    }
+
+    /**
+     * Point the shared instance at [name] and drop all state from the
+     * previously viewed group chat so one group's data never bleeds into another.
+     */
+    fun setGroup(name: String) {
+        if (name == groupName && _uiState.value.groupName.isNotBlank()) return
+        groupName = name
+        memberSessions.clear()
+        inFlightTurns.clear()
+        activeStreamMsgId.clear()
+        sessionToBot.clear()
+        _uiState.value = GroupChatUiState(groupName = name)
+        loadGroup()
+    }
+
+    private fun observeWsEvents() {
+        viewModelScope.launch(ioDispatcher) {
+            HermesWsClient.events.collect { event ->
+                when (event) {
+                    is WsEvent.MessageToken -> {
+                        val sid = event.sessionId?.trim('\"', ' ')
+                        if (sid != null) {
+                            val streamId = activeStreamMsgId[sid]
+                            val bot = sessionToBot[sid]
+                            if (streamId != null && bot != null && event.token.isNotEmpty()) {
+                                _uiState.update { state ->
+                                    val existing = state.messages.find { it.id == streamId }
+                                    val updatedMessages =
+                                        if (existing != null) {
+                                            state.messages.map { msg ->
+                                                if (msg.id == streamId) {
+                                                    msg.copy(text = msg.text + event.token)
+                                                } else {
+                                                    msg
+                                                }
+                                            }
+                                        } else {
+                                            state.messages +
+                                                GroupChatMessage(
+                                                    id = streamId,
+                                                    senderName = bot.name,
+                                                    senderDisplayName = bot.effectiveTitle,
+                                                    isUser = false,
+                                                    avatarMeta = bot.botMeta()?.avatar,
+                                                    text = event.token,
+                                                    isStreaming = true,
+                                                )
+                                        }
+                                    state.copy(messages = updatedMessages)
+                                }
+                            }
+                        }
+                    }
+
+                    is WsEvent.MessageComplete -> {
+                        val sid = event.sessionId?.trim('\"', ' ')
+                        if (sid != null) {
+                            Log.d("GroupChatViewModel", "MessageComplete for session $sid: '${event.text.take(50)}'")
+                            inFlightTurns[sid]?.complete(event.text)
+                        }
+                    }
+
+                    else -> {}
+                }
+            }
+        }
+    }
+
+    private suspend fun fetchProfiles(): List<ProfileInfo> {
+        try {
+            val rpcResult = HermesWsClient.request(WsMethods.PROFILES_LIST).await()
+            val jsonElement =
+                when (rpcResult) {
+                    is JsonElement -> rpcResult
+                    null -> null
+                    else -> rpcResult.toJsonElement()
+                }
+            if (jsonElement != null) {
+                val resp = json.decodeFromJsonElement<ProfilesResponse>(jsonElement)
+                if (!resp.profiles.isNullOrEmpty()) {
+                    return resp.profiles
+                }
+            }
+        } catch (_: Exception) {
+            // Fallback to REST API below
+        }
+        val result = safeApiCall { ApiClient.hermesApi.getProfiles() }
+        return (result as? NetworkResult.Success)?.data?.profiles.orEmpty()
+    }
+
+    fun loadGroup() {
+        viewModelScope.launch(ioDispatcher) {
+            _uiState.update { it.copy(isLoading = true, errorMessage = null) }
+            val allProfiles = fetchProfiles()
+            if (allProfiles.isNotEmpty()) {
+                var groupMembers =
+                    allProfiles.filter {
+                        val botGroups = it.botMeta()?.groups.orEmpty()
+                        botGroups.contains(groupName) || botGroups.any { g -> g.equals(groupName, ignoreCase = true) }
+                    }
+
+                // Fallback: If group name was composed from bot names (e.g. "default, scoutbot")
+                if (groupMembers.isEmpty() && groupName.contains(",")) {
+                    val targetNames = groupName.split(",").map { it.trim().lowercase() }
+                    groupMembers = allProfiles.filter { targetNames.contains(it.name.lowercase()) }
+                }
+
+                // Final safety fallback: If 0 members found, use all non-hidden bots
+                if (groupMembers.isEmpty()) {
+                    groupMembers = allProfiles.filter { !it.isHidden }
+                }
+
+                Log.d(
+                    "GroupChatViewModel",
+                    "Resolved ${groupMembers.size} members for group '$groupName': ${groupMembers.map { it.name }}",
+                )
+
+                // Hydrate previous group chat messages from cross-device sync snapshot
+                val defaultProfile = allProfiles.find { it.is_default == true || it.name == "default" }
+                val syncSnapshotElement = defaultProfile?.ui_meta?.get("hermes-bots-groups")
+                val syncSnapshot =
+                    syncSnapshotElement?.let { el ->
+                        try {
+                            json.decodeFromJsonElement<GroupChatSyncSnapshot>(el)
+                        } catch (e: Exception) {
+                            Log.w("GroupChatViewModel", "Failed to decode sync snapshot: ${e.message}")
+                            null
+                        }
+                    }
+
+                var initialMessages = _uiState.value.messages
+                if (initialMessages.isEmpty() && syncSnapshot?.rooms != null) {
+                    val matchingRoom =
+                        syncSnapshot.rooms[groupName]
+                            ?: syncSnapshot.rooms["name:$groupName"]
+                            ?: syncSnapshot.rooms["id:$groupName"]
+                            ?: syncSnapshot.rooms.values.find { it.name.equals(groupName, ignoreCase = true) }
+
+                    val syncedLog = matchingRoom?.log.orEmpty()
+                    if (syncedLog.isNotEmpty()) {
+                        initialMessages =
+                            syncedLog.map { entry ->
+                                val isUser = entry.from?.kind != "member"
+                                val senderName = entry.from?.name.orEmpty().ifBlank { if (isUser) "user" else "bot" }
+                                val memberProfile = allProfiles.find { it.name.equals(senderName, ignoreCase = true) }
+                                GroupChatMessage(
+                                    id = entry.id ?: UUID.randomUUID().toString(),
+                                    senderName = memberProfile?.name ?: senderName,
+                                    senderDisplayName =
+                                        if (isUser) "You" else (memberProfile?.effectiveTitle ?: senderName),
+                                    isUser = isUser,
+                                    avatarMeta = memberProfile?.botMeta()?.avatar,
+                                    text = entry.text.orEmpty(),
+                                    timestamp = entry.at ?: System.currentTimeMillis(),
+                                    thread = entry.thread,
+                                )
+                            }
+                        Log.d("GroupChatViewModel", "Hydrated ${initialMessages.size} messages from sync snapshot")
+                    }
+                }
+
+                _uiState.update {
+                    it.copy(
+                        members = groupMembers,
+                        messages = initialMessages,
+                        isLoading = false,
+                    )
+                }
+            } else {
+                _uiState.update {
+                    it.copy(
+                        isLoading = false,
+                        errorMessage = "Failed to load group members",
+                    )
+                }
+            }
+        }
+    }
+
+    private suspend fun ensureMemberSession(bot: ProfileInfo): MemberSession? {
+        val cached = memberSessions[bot.name]
+        if (cached != null) {
+            return cached
+        }
+
+        val title = "Group: $groupName"
+        try {
+            val createParams =
+                buildMap<String, Any> {
+                    put("profile", bot.name)
+                    put("title", title)
+                    put("source", "desktop")
+                    put("hidden", true)
+                }
+            val deferred = HermesWsClient.request(WsMethods.SESSION_CREATE, createParams)
+            val res = deferred.await()
+            val sessionInfo = extractSessionInfo(res)
+            if (sessionInfo != null) {
+                memberSessions[bot.name] = sessionInfo
+                return sessionInfo
+            }
+        } catch (e: Exception) {
+            Log.w("GroupChatViewModel", "session.create failed for ${bot.name}: ${e.message}")
+        }
+        return null
+    }
+
+    fun sendMessage(rawText: String) {
+        val text = rawText.trim()
+        Log.d("GroupChatViewModel", "sendMessage called with: '$text'")
+        if (text.isBlank()) return
+
+        val members = _uiState.value.members
+        if (members.isEmpty()) {
+            Log.w("GroupChatViewModel", "sendMessage: No members in group, ignoring")
+            return
+        }
+
+        val userMessage =
+            GroupChatMessage(
+                id = UUID.randomUUID().toString(),
+                senderName = "user",
+                senderDisplayName = "You",
+                isUser = true,
+                text = text,
+            )
+
+        _uiState.update {
+            it.copy(messages = it.messages + userMessage)
+        }
+        persistSyncSnapshot(_uiState.value.messages)
+
+        viewModelScope.launch(ioDispatcher) {
+            val responders = GroupChatMentions.resolveResponders(text, members)
+            Log.d("GroupChatViewModel", "Responders: ${responders.map { it.name }}")
+
+            for (bot in responders) {
+                _uiState.update { it.copy(activeSpeaker = bot.effectiveTitle) }
+                val prompt =
+                    GroupChatMentions.buildTurnPrompt(
+                        groupName = groupName,
+                        viewer = bot,
+                        peers = members.filter { it.name != bot.name },
+                        recentLog = _uiState.value.messages,
+                    )
+
+                val streamMsgId = UUID.randomUUID().toString()
+                var activeRuntimeId: String? = null
+                var activeStoredId: String? = null
+                try {
+                    val sessionInfo = ensureMemberSession(bot)
+                    if (sessionInfo == null) {
+                        Log.w("GroupChatViewModel", "Could not obtain session for ${bot.name}")
+                        continue
+                    }
+                    val runtimeId = sessionInfo.runtimeSessionId
+                    val storedId = sessionInfo.storedSessionId
+                    activeRuntimeId = runtimeId
+                    activeStoredId = storedId
+
+                    activeStreamMsgId[runtimeId] = streamMsgId
+                    storedId?.let { activeStreamMsgId[it] = streamMsgId }
+
+                    sessionToBot[runtimeId] = bot
+                    storedId?.let { sessionToBot[it] = bot }
+
+                    // Set ActiveSessionHolder so the active WebSocket context matches this turn
+                    ActiveSessionHolder.set(runtimeId, runtimeId)
+
+                    // Register in-flight listener
+                    val turnDeferred = CompletableDeferred<String>()
+                    inFlightTurns[runtimeId] = turnDeferred
+                    storedId?.let { inFlightTurns[it] = turnDeferred }
+
+                    // Submit prompt via sendMessage
+                    HermesWsClient.sendMessage(
+                        sessionId = runtimeId,
+                        text = prompt,
+                    )
+
+                    // Await event or polling fallback
+                    var replyText =
+                        withTimeoutOrNull(45_000L) {
+                            turnDeferred.await()
+                        }
+                    inFlightTurns.remove(runtimeId)
+                    storedId?.let { inFlightTurns.remove(it) }
+
+                    // Polling fallback if event dropped or session was reaped
+                    if (replyText == null) {
+                        val targetIds = listOfNotNull(storedId, runtimeId).distinct()
+                        for (tid in targetIds) {
+                            try {
+                                val res =
+                                    safeApiCall {
+                                        ApiClient.hermesApi.getSessionMessages(
+                                            sessionId = tid,
+                                            limit = 10,
+                                            order = "latest",
+                                        )
+                                    }
+                                if (res is NetworkResult.Success) {
+                                    val lastAssistant =
+                                        res.data.messages.reversed().firstOrNull { it.role == "assistant" }
+                                    val candidate = lastAssistant?.contentText?.trim()
+                                    if (!candidate.isNullOrBlank()) {
+                                        replyText = candidate
+                                        break
+                                    }
+                                }
+                            } catch (e: Exception) {
+                                Log.w("GroupChatViewModel", "REST fallback failed for $tid: ${e.message}")
+                            }
+                        }
+                    }
+
+                    if (replyText != null && !isPass(replyText) && replyText.isNotBlank()) {
+                        _uiState.update { state ->
+                            val existing = state.messages.find { it.id == streamMsgId }
+                            val finalMsg =
+                                GroupChatMessage(
+                                    id = streamMsgId,
+                                    senderName = bot.name,
+                                    senderDisplayName = bot.effectiveTitle,
+                                    isUser = false,
+                                    avatarMeta = bot.botMeta()?.avatar,
+                                    text = replyText.trim(),
+                                    isStreaming = false,
+                                )
+                            val updatedList =
+                                if (existing != null) {
+                                    state.messages.map { if (it.id == streamMsgId) finalMsg else it }
+                                } else {
+                                    state.messages + finalMsg
+                                }
+                            state.copy(messages = updatedList)
+                        }
+                        persistSyncSnapshot(_uiState.value.messages)
+                    } else {
+                        _uiState.update { state ->
+                            state.copy(messages = state.messages.filter { it.id != streamMsgId })
+                        }
+                    }
+                } catch (e: Exception) {
+                    Log.w("GroupChatViewModel", "Turn failed for ${bot.name}: ${e.message}")
+                    _uiState.update { state ->
+                        state.copy(messages = state.messages.filter { it.id != streamMsgId })
+                    }
+                } finally {
+                    activeRuntimeId?.let {
+                        activeStreamMsgId.remove(it)
+                        sessionToBot.remove(it)
+                        inFlightTurns.remove(it)
+                    }
+                    activeStoredId?.let {
+                        activeStreamMsgId.remove(it)
+                        sessionToBot.remove(it)
+                        inFlightTurns.remove(it)
+                    }
+                }
+            }
+            _uiState.update { it.copy(activeSpeaker = null) }
+        }
+    }
+
+    private fun persistSyncSnapshot(currentMessages: List<GroupChatMessage>) {
+        viewModelScope.launch(ioDispatcher) {
+            try {
+                val allProfiles = fetchProfiles()
+                val defaultProfile =
+                    allProfiles.find { it.is_default == true || it.name == "default" } ?: return@launch
+                val existingElement = defaultProfile.ui_meta?.get("hermes-bots-groups")
+                val existingSnapshot =
+                    existingElement?.let {
+                        try {
+                            json.decodeFromJsonElement<GroupChatSyncSnapshot>(it)
+                        } catch (_: Exception) {
+                            null
+                        }
+                    } ?: GroupChatSyncSnapshot(version = 3, rooms = emptyMap())
+
+                val logEntries =
+                    currentMessages.takeLast(32).map { msg ->
+                        GroupChatSyncLogEntry(
+                            id = msg.id,
+                            from =
+                                GroupChatSyncFrom(
+                                    kind = if (msg.isUser) "user" else "member",
+                                    name = if (msg.isUser) "You" else msg.senderName,
+                                ),
+                            text = msg.text,
+                            at = msg.timestamp,
+                            thread = msg.thread,
+                        )
+                    }
+
+                val roomKey = "name:$groupName"
+                val updatedRoom =
+                    GroupChatRoomMeta(
+                        name = groupName,
+                        members = _uiState.value.members.map { JsonPrimitive(it.name) },
+                        log = logEntries,
+                        updatedAt = System.currentTimeMillis(),
+                    )
+
+                val updatedRooms = (existingSnapshot.rooms.orEmpty() + (roomKey to updatedRoom))
+                val newSnapshot =
+                    existingSnapshot.copy(
+                        version = 3,
+                        updatedAt = System.currentTimeMillis(),
+                        rooms = updatedRooms,
+                    )
+
+                val uiMetaPayload = mapOf("hermes-bots-groups" to snapshotToMap(newSnapshot))
+
+                HermesWsClient.request(
+                    WsMethods.PROFILES_CONFIGURE,
+                    mapOf(
+                        "name" to defaultProfile.name,
+                        "ui_meta" to uiMetaPayload,
+                    ),
+                ).await()
+            } catch (e: Exception) {
+                Log.w("GroupChatViewModel", "persistSyncSnapshot failed: ${e.message}")
+            }
+        }
+    }
+
+    private fun snapshotToMap(snapshot: GroupChatSyncSnapshot): Map<String, Any?> {
+        val roomsMap = mutableMapOf<String, Any?>()
+        snapshot.rooms?.forEach { (key, room) ->
+            val roomMap = mutableMapOf<String, Any?>()
+            room.name?.let { roomMap["name"] = it }
+            room.roomId?.let { roomMap["roomId"] = it }
+            room.picture?.let { roomMap["picture"] = it }
+            room.image?.let { roomMap["image"] = it }
+            room.updatedAt?.let { roomMap["updatedAt"] = it }
+            room.createdAt?.let { roomMap["createdAt"] = it }
+            room.revision?.let { roomMap["revision"] = it }
+            room.members?.let { members ->
+                roomMap["members"] =
+                    members.mapNotNull {
+                        when (it) {
+                            is JsonPrimitive -> it.content
+                            is JsonObject -> it["name"]?.jsonPrimitive?.content
+                            else -> null
+                        }
+                    }
+            }
+            room.log?.let { log ->
+                roomMap["log"] =
+                    log.map { entry ->
+                        buildMap<String, Any?> {
+                            entry.id?.let { put("id", it) }
+                            entry.text?.let { put("text", it) }
+                            entry.at?.let { put("at", it) }
+                            entry.thread?.let { put("thread", it) }
+                            entry.from?.let { f ->
+                                put(
+                                    "from",
+                                    buildMap<String, Any?> {
+                                        f.kind?.let { put("kind", it) }
+                                        f.name?.let { put("name", it) }
+                                        f.source?.let { put("source", it) }
+                                    },
+                                )
+                            }
+                        }
+                    }
+            }
+            roomsMap[key] = roomMap
+        }
+
+        return buildMap {
+            put("version", snapshot.version ?: 3)
+            put("updatedAt", snapshot.updatedAt ?: System.currentTimeMillis())
+            put("rooms", roomsMap)
+            snapshot.deleted?.let { put("deleted", it) }
+        }
+    }
+
+    private fun isPass(text: String): Boolean {
+        val clean = text.trim().lowercase()
+        return clean == "(pass)" || clean == "pass"
+    }
+
+    private fun extractSessionInfo(response: Any?): MemberSession? {
+        if (response is Map<*, *>) {
+            val runtimeId =
+                response["session_id"]?.toString()?.trim('\"', ' ')
+                    ?: (response["result"] as? Map<*, *>)?.get("session_id")?.toString()?.trim('\"', ' ')
+            val storedId =
+                response["stored_session_id"]?.toString()?.trim('\"', ' ')
+                    ?: (response["result"] as? Map<*, *>)?.get("stored_session_id")?.toString()?.trim('\"', ' ')
+            if (!runtimeId.isNullOrBlank()) {
+                return MemberSession(runtimeSessionId = runtimeId, storedSessionId = storedId)
+            }
+        }
+        return null
+    }
+}

app/src/main/java/com/m57/hermescontrol/ui/common/HermesScaffold.kt

@@ -6,6 +6,7 @@ import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.calculateEndPadding
 import androidx.compose.foundation.layout.calculateStartPadding
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.navigationBars
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
@@ -160,7 +161,7 @@ fun HermesScaffold(
 
     Scaffold(
         modifier = modifier.nestedScroll(scrollBehavior.nestedScrollConnection),
-        contentWindowInsets = WindowInsets(0, 0, 0, 0),
+        contentWindowInsets = WindowInsets.navigationBars,
         snackbarHost = { snackbarHost() },
         topBar = {
             TopAppBar(

app/src/main/res/values-ko/strings.xml

@@ -802,4 +802,12 @@
         <item quantity="other">에이전트 %1$d개 실행 중</item>
     </plurals>
     <string name="task_progress_open_details">작업 세부 정보 열기</string>
+    <!-- Group Chat Room -->
+    <string name="group_chat_composer_hint">%1$s에게 메시지 보내기… (@bot으로 멘션)</string>
+    <string name="group_chat_empty_title">메시지 없음</string>
+    <string name="group_chat_empty_subtitle">봇을 멘션하거나 @all을 사용하여 협업을 시작하세요.</string>
+    <string name="group_chat_thinking">%1$s 생각 중…</string>
+    <string name="group_chat_typing">입력 중…</string>
+    <string name="group_chat_members_count">멤버 %1$d명</string>
+    <string name="group_chat_mention_all">@all</string>
 </resources>

app/src/main/res/values-zh/strings.xml

@@ -1101,4 +1101,12 @@
     <!-- system action toast templates -->
     <string name="system_action_started">%1$s 已开始</string>
     <string name="system_action_failed">%1$s 失败：%2$s</string>
+    <!-- Group Chat Room -->
+    <string name="group_chat_composer_hint">发消息给 %1$s…（使用 @bot 提及）</string>
+    <string name="group_chat_empty_title">暂无消息</string>
+    <string name="group_chat_empty_subtitle">提及某个 Bot 或使用 @all 开始协同。</string>
+    <string name="group_chat_thinking">%1$s 正在思考…</string>
+    <string name="group_chat_typing">正在输入…</string>
+    <string name="group_chat_members_count">%1$d 个成员</string>
+    <string name="group_chat_mention_all">@all</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -1232,4 +1232,12 @@
     <!-- system action toast templates -->
     <string name="system_action_started">%1$s started</string>
     <string name="system_action_failed">%1$s failed: %2$s</string>
+    <!-- Group Chat Room -->
+    <string name="group_chat_composer_hint">Message %1$s… (use @bot to mention)</string>
+    <string name="group_chat_empty_title">No Messages Yet</string>
+    <string name="group_chat_empty_subtitle">Mention a bot or use @all to kick off collaboration.</string>
+    <string name="group_chat_thinking">%1$s is thinking…</string>
+    <string name="group_chat_typing">Typing…</string>
+    <string name="group_chat_members_count">%1$d members</string>
+    <string name="group_chat_mention_all">@all</string>
 </resources>

app/src/test/java/com/m57/hermescontrol/data/model/ProfileSerializationTest.kt

@@ -1,8 +1,9 @@
 package com.m57.hermescontrol.data.model
 
-import com.m57.hermescontrol.data.remote.OkHttpProvider
-import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.encodeToJsonElement
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertNotNull
@@ -11,120 +12,132 @@ import org.junit.Assert.assertTrue
 import org.junit.Test
 
 class ProfileSerializationTest {
-    private val json = OkHttpProvider.json
+    private val json = Json { ignoreUnknownKeys = true }
 
     @Test
-    fun testProfileInfoDeserializationWithBotMetadata() {
-        val jsonStr =
-            """
-            {
-                "name": "researcher",
-                "path": "/home/user/.hermes/profiles/researcher",
-                "is_default": false,
-                "model": "anthropic/claude-3-7-sonnet",
-                "provider": "anthropic",
-                "skill_count": 5,
-                "description": "Base description",
-                "display_name": "Researcher Agent",
-                "has_avatar": true,
-                "canonical_session": {
-                    "id": "sess-canon-123",
-                    "resolved_id": "sess-canon-tip",
-                    "root_title": "Bot Chat",
-                    "title": "Bot Chat",
-                    "preview": "Latest research report ready.",
-                    "started_at": 1700000000,
-                    "last_active": 1700005000,
-                    "message_count": 42
-                },
-                "worker_session": {
-                    "id": "worker-456",
-                    "source": "kanban",
-                    "title": "Background analysis",
-                    "last_active": 1700006000
-                },
-                "last_session": {
-                    "id": "last-789",
-                    "title": "Ad-hoc task",
-                    "preview": "Done!",
-                    "started_at": 1700001000,
-                    "last_active": 1700002000,
-                    "message_count": 10
-                },
-                "ui_meta": {
-                    "hermes-bots": {
-                        "title": "Dr. Researcher",
-                        "description": "Deep literature scout",
-                        "avatar": {
-                            "shape": "hexagon",
-                            "color": "#4A90E2",
-                            "icon": "science",
-                            "image_url": "https://example.com/avatar.png"
-                        },
-                        "hidden": false,
-                        "groups": ["science-team", "daily-sync"]
-                    }
-                }
-            }
-            """.trimIndent()
+    fun testBotRosterMetaSerialization() {
+        val meta =
+            BotRosterMeta(
+                title = "Literature Scout",
+                description = "Scrapes arXiv and summarizes papers",
+                avatar =
+                    BotAvatarMeta(
+                        shape = "circle",
+                        color = "#4A90E2",
+                        icon = "science",
+                    ),
+                hidden = false,
+                groups = listOf("research", "ai-lab"),
+                group = "research",
+                created = 1718000000.0,
+            )
 
-        val profile = json.decodeFromString<ProfileInfo>(jsonStr)
-        assertEquals("researcher", profile.name)
-        assertEquals("Researcher Agent", profile.display_name)
-        assertTrue(profile.has_avatar == true)
+        val encoded = json.encodeToString(meta)
+        val decoded = json.decodeFromString<BotRosterMeta>(encoded)
 
-        // Canonical session
-        val canon = profile.canonical_session
-        assertNotNull(canon)
-        assertEquals("sess-canon-123", canon?.id)
-        assertEquals("sess-canon-tip", canon?.resolved_id)
-        assertEquals("Latest research report ready.", canon?.preview)
-        assertEquals(42, canon?.message_count)
+        assertEquals("Literature Scout", decoded.title)
+        assertEquals("Scrapes arXiv and summarizes papers", decoded.description)
+        assertEquals("circle", decoded.avatar?.shape)
+        assertEquals("#4A90E2", decoded.avatar?.color)
+        assertEquals("science", decoded.avatar?.icon)
+        assertEquals(false, decoded.hidden)
+        assertEquals(listOf("research", "ai-lab"), decoded.groups)
+        assertEquals("research", decoded.group)
+        assertEquals(1718000000.0, decoded.created)
+    }
 
-        // Worker session
-        val worker = profile.worker_session
-        assertNotNull(worker)
-        assertEquals("worker-456", worker?.id)
-        assertEquals("kanban", worker?.source)
+    @Test
+    fun testProfileInfoWithBotMetaExtraction() {
+        val botMeta =
+            BotRosterMeta(
+                title = "Custom Bot Title",
+                description = "Custom Bot Description",
+                avatar = BotAvatarMeta(shape = "hexagon", color = "#E91E63", icon = "robot"),
+                hidden = false,
+            )
 
-        // Bot metadata decoding
-        val botMeta = profile.botMeta(json)
-        assertNotNull(botMeta)
-        assertEquals("Dr. Researcher", botMeta?.title)
-        assertEquals("Deep literature scout", botMeta?.description)
-        assertEquals("hexagon", botMeta?.avatar?.shape)
-        assertEquals("#4A90E2", botMeta?.avatar?.color)
-        assertEquals(listOf("science-team", "daily-sync"), botMeta?.groups)
+        val profile =
+            ProfileInfo(
+                name = "custom_bot",
+                display_name = "Original Name",
+                description = "Original Description",
+                ui_meta = mapOf("hermes-bots" to json.encodeToJsonElement(botMeta)),
+                canonical_session =
+                    CanonicalSessionInfo(
+                        id = "sess-123",
+                        last_active = 1720000000.0,
+                    ),
+                worker_session =
+                    ProfileWorkerSummary(
+                        id = "worker-456",
+                        source = "kanban",
+                        title = "Task #42",
+                        last_active = 1720000100.0,
+                    ),
+            )
 
-        // Helpers
-        assertEquals("Dr. Researcher", profile.effectiveTitle)
-        assertEquals("Deep literature scout", profile.effectiveDescription)
+        val extractedMeta = profile.botMeta(json)
+        assertNotNull(extractedMeta)
+        assertEquals("Custom Bot Title", extractedMeta?.title)
+        assertEquals("Custom Bot Title", profile.effectiveTitle)
+        assertEquals("Custom Bot Description", profile.effectiveDescription)
+        assertFalse(profile.isHidden)
+        assertEquals("sess-123", profile.canonical_session?.id)
+        assertEquals("worker-456", profile.worker_session?.id)
+    }
+
+    @Test
+    fun testProfileInfoWithoutBotMeta_fallsBackToProfileFields() {
+        val profile =
+            ProfileInfo(
+                name = "regular_profile",
+                display_name = "My Profile",
+                description = "Just a profile",
+            )
+
+        assertNull(profile.botMeta(json))
+        assertEquals("My Profile", profile.effectiveTitle)
+        assertEquals("Just a profile", profile.effectiveDescription)
         assertFalse(profile.isHidden)
     }
 
     @Test
-    fun testProfileInfoBackwardCompatibility() {
-        val legacyJson =
-            """
-            {
-                "name": "default",
-                "is_default": true,
-                "model": "openai/gpt-4o",
-                "provider": "openai",
-                "description": "Default Assistant"
-            }
-            """.trimIndent()
+    fun testProfileInfoHidden_derivedFromBotMeta() {
+        val hiddenBot =
+            ProfileInfo(
+                name = "hidden_bot",
+                ui_meta =
+                    mapOf(
+                        "hermes-bots" to
+                            json.encodeToJsonElement(
+                                BotRosterMeta(title = "Hidden", hidden = true),
+                            ),
+                    ),
+            )
+
+        val visibleBot =
+            ProfileInfo(
+                name = "visible_bot",
+                ui_meta =
+                    mapOf(
+                        "hermes-bots" to
+                            json.encodeToJsonElement(
+                                BotRosterMeta(title = "Visible", hidden = false),
+                            ),
+                    ),
+            )
+
+        assertTrue(hiddenBot.isHidden)
+        assertFalse(visibleBot.isHidden)
+    }
+
+    @Test
+    fun testProfileInfoDefault_fallbackNames() {
+        val profile = ProfileInfo(name = "default")
 
-        val profile = json.decodeFromString<ProfileInfo>(legacyJson)
-        assertEquals("default", profile.name)
-        assertTrue(profile.is_default == true)
-        assertNull(profile.canonical_session)
-        assertNull(profile.worker_session)
-        assertNull(profile.last_session)
-        assertNull(profile.ui_meta)
         assertNull(profile.botMeta(json))
         assertEquals("default", profile.effectiveTitle)
-        assertEquals("Default Assistant", profile.effectiveDescription)
+        assertEquals("", profile.effectiveDescription)
         assertFalse(profile.isHidden)
     }
 
@@ -140,8 +153,17 @@ class ProfileSerializationTest {
                             GroupChatRoomMeta(
                                 id = "room-1",
                                 name = "War Room",
-                                members = listOf("default", "researcher"),
+                                members = listOf(JsonPrimitive("default"), JsonPrimitive("researcher")),
                                 picture = null,
+                                log =
+                                    listOf(
+                                        GroupChatSyncLogEntry(
+                                            id = "msg-1",
+                                            from = GroupChatSyncFrom(kind = "user", name = "You"),
+                                            text = "Let's review the code",
+                                            at = 1724000000L,
+                                        ),
+                                    ),
                                 updatedAt = 1724000000L,
                                 createdAt = 1723000000L,
                             ),
@@ -153,8 +175,11 @@ class ProfileSerializationTest {
         val decoded = json.decodeFromString<GroupChatSyncSnapshot>(encoded)
         assertEquals(3, decoded.version)
         assertEquals(1, decoded.rooms?.size)
-        assertEquals("War Room", decoded.rooms?.get("room-1")?.name)
-        assertEquals(listOf("default", "researcher"), decoded.rooms?.get("room-1")?.members)
+        val room = decoded.rooms?.get("room-1")
+        assertEquals("War Room", room?.name)
+        assertEquals(listOf("default", "researcher"), room?.memberNames)
+        assertEquals(1, room?.log?.size)
+        assertEquals("Let's review the code", room?.log?.first()?.text)
         assertEquals(1723500000L, decoded.deleted?.get("old-room"))
     }
 }

app/src/test/java/com/m57/hermescontrol/ui/bots/group/GroupChatMentionsTest.kt

@@ -0,0 +1,71 @@
+package com.m57.hermescontrol.ui.bots.group
+
+import com.m57.hermescontrol.data.model.BotAvatarMeta
+import com.m57.hermescontrol.data.model.BotRosterMeta
+import com.m57.hermescontrol.data.model.ProfileInfo
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.encodeToJsonElement
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class GroupChatMentionsTest {
+    private val json = Json { ignoreUnknownKeys = true }
+
+    private val botA =
+        ProfileInfo(
+            name = "scoutbot",
+            ui_meta =
+                mapOf(
+                    "hermes-bots" to
+                        json.encodeToJsonElement(
+                            BotRosterMeta(title = "Scout Bot", avatar = BotAvatarMeta()),
+                        ),
+                ),
+        )
+
+    private val botB =
+        ProfileInfo(
+            name = "coder",
+            ui_meta =
+                mapOf(
+                    "hermes-bots" to
+                        json.encodeToJsonElement(
+                            BotRosterMeta(title = "Dev Bot", avatar = BotAvatarMeta()),
+                        ),
+                ),
+        )
+
+    private val members = listOf(botA, botB)
+
+    @Test
+    fun parseMentions_detectsDirectBotHandle() {
+        val result = GroupChatMentions.parseMentions("Hey @scoutbot can you check this?", members)
+        assertFalse(result.isEveryone)
+        assertTrue(result.mentionedBots.contains("scoutbot"))
+        assertFalse(result.mentionedBots.contains("coder"))
+    }
+
+    @Test
+    fun parseMentions_detectsEveryoneAndAll() {
+        val resEveryone = GroupChatMentions.parseMentions("Hello @everyone!", members)
+        assertTrue(resEveryone.isEveryone)
+
+        val resAll = GroupChatMentions.parseMentions("@all status update please", members)
+        assertTrue(resAll.isEveryone)
+    }
+
+    @Test
+    fun resolveResponders_defaultsToAllWhenNoMention() {
+        val responders = GroupChatMentions.resolveResponders("General discussion message", members)
+        assertEquals(2, responders.size)
+    }
+
+    @Test
+    fun resolveResponders_filtersToMentionedOnly() {
+        val responders = GroupChatMentions.resolveResponders("@coder build the apk", members)
+        assertEquals(1, responders.size)
+        assertEquals("coder", responders.first().name)
+    }
+}

app/src/test/java/com/m57/hermescontrol/ui/bots/group/GroupChatViewModelTest.kt

@@ -0,0 +1,266 @@
+package com.m57.hermescontrol.ui.bots.group
+
+import android.util.Log
+import com.m57.hermescontrol.data.model.BotAvatarMeta
+import com.m57.hermescontrol.data.model.BotRosterMeta
+import com.m57.hermescontrol.data.model.GroupChatRoomMeta
+import com.m57.hermescontrol.data.model.GroupChatSyncFrom
+import com.m57.hermescontrol.data.model.GroupChatSyncLogEntry
+import com.m57.hermescontrol.data.model.GroupChatSyncSnapshot
+import com.m57.hermescontrol.data.model.ProfileInfo
+import com.m57.hermescontrol.data.model.ProfilesResponse
+import com.m57.hermescontrol.data.remote.ApiClient
+import com.m57.hermescontrol.data.remote.HermesApiService
+import com.m57.hermescontrol.data.ws.HermesWsClient
+import com.m57.hermescontrol.data.ws.WsEvent
+import io.mockk.coEvery
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.mockkStatic
+import io.mockk.unmockkObject
+import io.mockk.unmockkStatic
+import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.test.StandardTestDispatcher
+import kotlinx.coroutines.test.advanceUntilIdle
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.runTest
+import kotlinx.coroutines.test.setMain
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.encodeToJsonElement
+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 retrofit2.Response
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class GroupChatViewModelTest {
+    private val testDispatcher = StandardTestDispatcher()
+    private lateinit var mockApi: HermesApiService
+    private val eventsFlow = MutableSharedFlow<WsEvent>()
+    private val json = Json { ignoreUnknownKeys = true }
+
+    private val botA =
+        ProfileInfo(
+            name = "scout",
+            ui_meta =
+                mapOf(
+                    "hermes-bots" to
+                        json.encodeToJsonElement(
+                            BotRosterMeta(
+                                title = "Scout Bot",
+                                groups = listOf("Dev Team"),
+                                avatar = BotAvatarMeta(icon = "science"),
+                            ),
+                        ),
+                ),
+        )
+
+    private val botB =
+        ProfileInfo(
+            name = "coder",
+            ui_meta =
+                mapOf(
+                    "hermes-bots" to
+                        json.encodeToJsonElement(
+                            BotRosterMeta(
+                                title = "Dev Bot",
+                                groups = listOf("Dev Team"),
+                                avatar = BotAvatarMeta(icon = "code"),
+                            ),
+                        ),
+                ),
+        )
+
+    @Before
+    fun setUp() {
+        Dispatchers.setMain(testDispatcher)
+        mockkStatic(Log::class)
+        every { Log.d(any(), any()) } returns 0
+        every { Log.i(any(), any()) } returns 0
+        every { Log.w(any(), any<String>()) } returns 0
+        every { Log.e(any(), any()) } returns 0
+
+        mockkObject(ApiClient)
+        mockApi = mockk(relaxed = true)
+        every { ApiClient.hermesApi } returns mockApi
+
+        coEvery { mockApi.getProfiles() } returns
+            Response.success(
+                ProfilesResponse(
+                    profiles = listOf(botA, botB),
+                ),
+            )
+
+        mockkObject(HermesWsClient)
+        every { HermesWsClient.events } returns eventsFlow
+        every { HermesWsClient.send(any(), any(), any()) } returns "req-1"
+        every { HermesWsClient.sendMessage(any(), any(), any()) } returns "req-msg"
+
+        val createDeferred = CompletableDeferred<Any?>()
+        createDeferred.complete(mapOf("session_id" to "session-scout-1"))
+        every { HermesWsClient.request(any(), any(), any()) } returns createDeferred
+    }
+
+    @After
+    fun tearDown() {
+        unmockkObject(ApiClient)
+        unmockkObject(HermesWsClient)
+        unmockkStatic(Log::class)
+        Dispatchers.resetMain()
+    }
+
+    @Test
+    fun testLoadGroup_resolvesMembers() =
+        runTest(testDispatcher) {
+            val viewModel = GroupChatViewModel("Dev Team", ioDispatcher = testDispatcher)
+            advanceUntilIdle()
+
+            val state = viewModel.uiState.value
+            assertFalse(state.isLoading)
+            assertNull(state.errorMessage)
+            assertEquals(2, state.members.size)
+            assertEquals("scout", state.members[0].name)
+            assertEquals("coder", state.members[1].name)
+        }
+
+    @Test
+    fun testLoadGroup_hydratesFromSyncSnapshot() =
+        runTest(testDispatcher) {
+            val syncSnapshot =
+                GroupChatSyncSnapshot(
+                    version = 3,
+                    updatedAt = 1724000000L,
+                    rooms =
+                        mapOf(
+                            "name:Dev Team" to
+                                GroupChatRoomMeta(
+                                    name = "Dev Team",
+                                    members = listOf(JsonPrimitive("scout"), JsonPrimitive("coder")),
+                                    log =
+                                        listOf(
+                                            GroupChatSyncLogEntry(
+                                                id = "msg-prev-1",
+                                                from = GroupChatSyncFrom(kind = "user", name = "You"),
+                                                text = "Initial design spec",
+                                                at = 1724000000L,
+                                            ),
+                                            GroupChatSyncLogEntry(
+                                                id = "msg-prev-2",
+                                                from = GroupChatSyncFrom(kind = "member", name = "scout"),
+                                                text = "Looks solid, ready to build.",
+                                                at = 1724000010L,
+                                            ),
+                                        ),
+                                ),
+                        ),
+                )
+
+            val defaultProfileWithSnapshot =
+                ProfileInfo(
+                    name = "default",
+                    is_default = true,
+                    ui_meta = mapOf("hermes-bots-groups" to json.encodeToJsonElement(syncSnapshot)),
+                )
+
+            coEvery { mockApi.getProfiles() } returns
+                Response.success(
+                    ProfilesResponse(
+                        profiles = listOf(defaultProfileWithSnapshot, botA, botB),
+                    ),
+                )
+
+            val viewModel = GroupChatViewModel("Dev Team", ioDispatcher = testDispatcher)
+            advanceUntilIdle()
+
+            val state = viewModel.uiState.value
+            assertEquals(2, state.messages.size)
+            assertEquals("msg-prev-1", state.messages[0].id)
+            assertTrue(state.messages[0].isUser)
+            assertEquals("Initial design spec", state.messages[0].text)
+
+            assertEquals("msg-prev-2", state.messages[1].id)
+            assertFalse(state.messages[1].isUser)
+            assertEquals("scout", state.messages[1].senderName)
+            assertEquals("Looks solid, ready to build.", state.messages[1].text)
+        }
+
+    @Test
+    fun testSendMessage_streamsTokensAndCompletes() =
+        runTest(testDispatcher) {
+            val viewModel = GroupChatViewModel("Dev Team", ioDispatcher = testDispatcher)
+            testScheduler.runCurrent()
+
+            // Send message targeting only @scout
+            viewModel.sendMessage("@scout what's the status?")
+            testScheduler.runCurrent()
+
+            // State should contain user message
+            val userMsg = viewModel.uiState.value.messages.first()
+            assertTrue(userMsg.isUser)
+            assertEquals("@scout what's the status?", userMsg.text)
+
+            // Stream tokens
+            eventsFlow.emit(WsEvent.MessageToken(token = "Building ", sessionId = "session-scout-1"))
+            testScheduler.runCurrent()
+
+            val streamingMsg = viewModel.uiState.value.messages.last()
+            assertFalse(streamingMsg.isUser)
+            assertEquals("scout", streamingMsg.senderName)
+            assertEquals("Building ", streamingMsg.text)
+            assertTrue(streamingMsg.isStreaming)
+
+            eventsFlow.emit(WsEvent.MessageToken(token = "the APK...", sessionId = "session-scout-1"))
+            testScheduler.runCurrent()
+
+            val updatedStreaming = viewModel.uiState.value.messages.last()
+            assertEquals("Building the APK...", updatedStreaming.text)
+
+            // Complete turn
+            eventsFlow.emit(
+                WsEvent.MessageComplete(
+                    text = "Building the APK now! Everything looks green.",
+                    sessionId = "session-scout-1",
+                ),
+            )
+            testScheduler.runCurrent()
+
+            val finalState = viewModel.uiState.value
+            assertEquals(2, finalState.messages.size)
+            val botMsg = finalState.messages[1]
+            assertEquals("Building the APK now! Everything looks green.", botMsg.text)
+            assertFalse(botMsg.isStreaming)
+            assertNull(finalState.activeSpeaker)
+        }
+
+    @Test
+    fun testSendMessage_filtersOutPass() =
+        runTest(testDispatcher) {
+            val viewModel = GroupChatViewModel("Dev Team", ioDispatcher = testDispatcher)
+            testScheduler.runCurrent()
+
+            viewModel.sendMessage("@scout any updates?")
+            testScheduler.runCurrent()
+
+            eventsFlow.emit(
+                WsEvent.MessageComplete(
+                    text = "(pass)",
+                    sessionId = "session-scout-1",
+                ),
+            )
+            testScheduler.runCurrent()
+
+            val finalState = viewModel.uiState.value
+            // Only the user message should remain; (pass) is filtered out
+            assertEquals(1, finalState.messages.size)
+            assertTrue(finalState.messages.first().isUser)
+        }
+}