feat: add real-time status indicators for agent processing

Show transient status labels (thinking, tool use, error) in the chat UI
via a new `type` field on WebSocket messages. The server emits "思考中..."
before LLM calls and tool-specific labels (e.g. "検索中...（query）")
before each tool execution. The Android client renders these as an
animated indicator above the message input without persisting to the DB.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

android/app/src/main/java/io/picoclaw/android/di/AppModule.kt

@@ -14,6 +14,7 @@ import io.picoclaw.android.core.domain.usecase.DisconnectChatUseCase
 import io.picoclaw.android.core.domain.usecase.LoadMoreMessagesUseCase
 import io.picoclaw.android.core.domain.usecase.ObserveConnectionUseCase
 import io.picoclaw.android.core.domain.usecase.ObserveMessagesUseCase
+import io.picoclaw.android.core.domain.usecase.ObserveStatusUseCase
 import io.picoclaw.android.core.domain.usecase.SendMessageUseCase
 import io.picoclaw.android.feature.chat.ChatViewModel
 import kotlinx.coroutines.CoroutineScope
@@ -71,10 +72,11 @@ val appModule = module {
     factory { SendMessageUseCase(get()) }
     factory { ObserveMessagesUseCase(get()) }
     factory { ObserveConnectionUseCase(get()) }
+    factory { ObserveStatusUseCase(get()) }
     factory { LoadMoreMessagesUseCase(get()) }
     factory { ConnectChatUseCase(get()) }
     factory { DisconnectChatUseCase(get()) }
 
     // ViewModel
-    viewModel { ChatViewModel(get(), get(), get(), get(), get(), get()) }
+    viewModel { ChatViewModel(get(), get(), get(), get(), get(), get(), get()) }
 }

android/core/data/src/main/java/io/picoclaw/android/core/data/remote/dto/WsOutgoing.kt

@@ -3,4 +3,7 @@ package io.picoclaw.android.core.data.remote.dto
 import kotlinx.serialization.Serializable
 
 @Serializable
-data class WsOutgoing(val content: String)
+data class WsOutgoing(
+    val content: String,
+    val type: String? = null
+)

android/core/data/src/main/java/io/picoclaw/android/core/data/repository/ChatRepositoryImpl.kt

@@ -13,6 +13,7 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
@@ -27,6 +28,7 @@ class ChatRepositoryImpl(
 ) : ChatRepository {
 
     private val _displayLimit = MutableStateFlow(INITIAL_LOAD_COUNT)
+    private val _statusLabel = MutableStateFlow<String?>(null)
 
     @Suppress("OPT_IN_USAGE")
     override val messages: StateFlow<List<ChatMessage>> =
@@ -38,11 +40,19 @@ class ChatRepositoryImpl(
 
     override val connectionState: StateFlow<ConnectionState> = webSocketClient.connectionState
 
+    override val statusLabel: StateFlow<String?> = _statusLabel.asStateFlow()
+
     init {
         scope.launch {
             webSocketClient.incomingMessages.collect { dto ->
-                val entity = MessageMapper.toEntity(dto)
-                messageDao.insert(entity)
+                when (dto.type) {
+                    "status" -> _statusLabel.value = dto.content
+                    else -> {
+                        _statusLabel.value = null
+                        val entity = MessageMapper.toEntity(dto)
+                        messageDao.insert(entity)
+                    }
+                }
             }
         }
     }

android/core/domain/src/main/java/io/picoclaw/android/core/domain/repository/ChatRepository.kt

@@ -8,6 +8,7 @@ import kotlinx.coroutines.flow.StateFlow
 interface ChatRepository {
     val messages: StateFlow<List<ChatMessage>>
     val connectionState: StateFlow<ConnectionState>
+    val statusLabel: StateFlow<String?>
     suspend fun sendMessage(text: String, images: List<ImageAttachment> = emptyList())
     fun loadMore()
     fun connect()

android/core/domain/src/main/java/io/picoclaw/android/core/domain/usecase/ObserveStatusUseCase.kt

@@ -0,0 +1,8 @@
+package io.picoclaw.android.core.domain.usecase
+
+import io.picoclaw.android.core.domain.repository.ChatRepository
+import kotlinx.coroutines.flow.StateFlow
+
+class ObserveStatusUseCase(private val repository: ChatRepository) {
+    operator fun invoke(): StateFlow<String?> = repository.statusLabel
+}

android/feature/chat/src/main/java/io/picoclaw/android/feature/chat/ChatUiState.kt

@@ -11,5 +11,6 @@ data class ChatUiState(
     val pendingImages: List<ImageAttachment> = emptyList(),
     val isLoadingMore: Boolean = false,
     val canLoadMore: Boolean = true,
-    val error: String? = null
+    val error: String? = null,
+    val statusLabel: String? = null
 )

android/feature/chat/src/main/java/io/picoclaw/android/feature/chat/ChatViewModel.kt

@@ -7,6 +7,7 @@ import io.picoclaw.android.core.domain.usecase.DisconnectChatUseCase
 import io.picoclaw.android.core.domain.usecase.LoadMoreMessagesUseCase
 import io.picoclaw.android.core.domain.usecase.ObserveConnectionUseCase
 import io.picoclaw.android.core.domain.usecase.ObserveMessagesUseCase
+import io.picoclaw.android.core.domain.usecase.ObserveStatusUseCase
 import io.picoclaw.android.core.domain.usecase.SendMessageUseCase
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -20,6 +21,7 @@ class ChatViewModel(
     private val sendMessage: SendMessageUseCase,
     private val observeMessages: ObserveMessagesUseCase,
     private val observeConnection: ObserveConnectionUseCase,
+    private val observeStatus: ObserveStatusUseCase,
     private val loadMoreMessages: LoadMoreMessagesUseCase,
     private val connectChat: ConnectChatUseCase,
     private val disconnectChat: DisconnectChatUseCase
@@ -45,6 +47,12 @@ class ChatViewModel(
                 _uiState.update { it.copy(connectionState = state) }
             }
         }
+
+        viewModelScope.launch {
+            observeStatus().collect { label ->
+                _uiState.update { it.copy(statusLabel = label) }
+            }
+        }
     }
 
     fun onEvent(event: ChatEvent) {

android/feature/chat/src/main/java/io/picoclaw/android/feature/chat/component/StatusIndicator.kt

@@ -0,0 +1,49 @@
+package io.picoclaw.android.feature.chat.component
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+
+@Composable
+fun StatusIndicator(
+    label: String?,
+    modifier: Modifier = Modifier
+) {
+    AnimatedVisibility(
+        visible = label != null,
+        enter = fadeIn(),
+        exit = fadeOut()
+    ) {
+        Row(
+            modifier = modifier
+                .fillMaxWidth()
+                .padding(horizontal = 16.dp, vertical = 6.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            CircularProgressIndicator(
+                modifier = Modifier.size(14.dp),
+                strokeWidth = 2.dp,
+                color = MaterialTheme.colorScheme.onSurfaceVariant
+            )
+            Spacer(modifier = Modifier.width(8.dp))
+            Text(
+                text = label ?: "",
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant
+            )
+        }
+    }
+}

android/feature/chat/src/main/java/io/picoclaw/android/feature/chat/screen/ChatScreen.kt

@@ -32,6 +32,7 @@ import io.picoclaw.android.feature.chat.component.ConnectionBanner
 import io.picoclaw.android.feature.chat.component.ImagePreviewRow
 import io.picoclaw.android.feature.chat.component.MessageInput
 import io.picoclaw.android.feature.chat.component.MessageList
+import io.picoclaw.android.feature.chat.component.StatusIndicator
 import org.koin.androidx.compose.koinViewModel
 import java.io.File
 
@@ -134,6 +135,8 @@ fun ChatScreen(
                 modifier = Modifier.weight(1f)
             )
 
+            StatusIndicator(label = uiState.statusLabel)
+
             ImagePreviewRow(
                 images = uiState.pendingImages,
                 onRemove = { viewModel.onEvent(ChatEvent.OnImageRemoved(it)) }

pkg/agent/loop.go

@@ -188,6 +188,13 @@ func (al *AgentLoop) Run(ctx context.Context) error {
 			response, err := al.processMessage(ctx, msg)
 			if err != nil {
 				response = fmt.Sprintf("Error processing message: %v", err)
+				al.bus.PublishOutbound(bus.OutboundMessage{
+					Channel: msg.Channel,
+					ChatID:  msg.ChatID,
+					Content: response,
+					Type:    "error",
+				})
+				continue
 			}
 
 			if response != "" {
@@ -406,7 +413,17 @@ func (al *AgentLoop) runAgentLoop(ctx context.Context, opts processOptions) (str
 	// 3. Save user message to session
 	al.sessions.AddMessage(opts.SessionKey, "user", opts.UserMessage)
 
-	// 4. Run LLM iteration loop
+	// 4. Emit thinking status
+	if !constants.IsInternalChannel(opts.Channel) {
+		al.bus.PublishOutbound(bus.OutboundMessage{
+			Channel: opts.Channel,
+			ChatID:  opts.ChatID,
+			Content: "思考中...",
+			Type:    "status",
+		})
+	}
+
+	// 5. Run LLM iteration loop
 	finalContent, iteration, err := al.runLLMIteration(ctx, messages, opts)
 	if err != nil {
 		return "", err
@@ -711,6 +728,18 @@ func (al *AgentLoop) runLLMIteration(ctx context.Context, messages []providers.M
 				}
 			}
 
+			// Emit tool use status indicator
+			if !constants.IsInternalChannel(opts.Channel) {
+				if label := statusLabel(tc.Name, tc.Arguments); label != "" {
+					al.bus.PublishOutbound(bus.OutboundMessage{
+						Channel: opts.Channel,
+						ChatID:  opts.ChatID,
+						Content: label,
+						Type:    "status",
+					})
+				}
+			}
+
 			toolResult := al.tools.ExecuteWithContext(ctx, tc.Name, tc.Arguments, opts.Channel, opts.ChatID, asyncCallback)
 
 			// Send ForUser content to user immediately if not Silent

pkg/agent/status.go

@@ -0,0 +1,199 @@
+package agent
+
+import (
+	"fmt"
+	"net/url"
+	"path/filepath"
+	"unicode/utf8"
+)
+
+// statusLabel generates a human-readable Japanese status label for a tool call.
+func statusLabel(toolName string, args map[string]interface{}) string {
+	switch toolName {
+	case "web_search":
+		if q := strArg(args, "query"); q != "" {
+			return fmt.Sprintf("検索中...（%s）", truncLabel(q, 20))
+		}
+		return "検索中..."
+	case "web_fetch":
+		if u := strArg(args, "url"); u != "" {
+			return fmt.Sprintf("ページ取得中...（%s）", hostFromURL(u))
+		}
+		return "ページ取得中..."
+	case "read_file":
+		return fileStatusLabel("ファイル読み取り中...", args)
+	case "write_file":
+		return fileStatusLabel("ファイル書き込み中...", args)
+	case "edit_file":
+		return fileStatusLabel("ファイル編集中...", args)
+	case "append_file":
+		return fileStatusLabel("ファイル追記中...", args)
+	case "list_dir":
+		if p := strArg(args, "path"); p != "" {
+			return fmt.Sprintf("フォルダ確認中...（%s）", filepath.Base(p)+"/")
+		}
+		return "フォルダ確認中..."
+	case "exec":
+		if c := strArg(args, "command"); c != "" {
+			return fmt.Sprintf("コマンド実行中...（%s）", truncLabel(c, 30))
+		}
+		return "コマンド実行中..."
+	case "memory":
+		return memoryStatusLabel(args)
+	case "skill":
+		return skillStatusLabel(args)
+	case "cron":
+		return cronStatusLabel(args)
+	case "message":
+		return "メッセージ送信中..."
+	case "spawn":
+		if l := strArg(args, "label"); l != "" {
+			return fmt.Sprintf("サブタスク開始中...（%s）", truncLabel(l, 20))
+		}
+		return "サブタスク開始中..."
+	case "subagent":
+		if l := strArg(args, "label"); l != "" {
+			return fmt.Sprintf("サブタスク実行中...（%s）", truncLabel(l, 20))
+		}
+		return "サブタスク実行中..."
+	case "i2c":
+		return i2cStatusLabel(args)
+	case "spi":
+		return spiStatusLabel(args)
+	default:
+		return "処理中..."
+	}
+}
+
+func fileStatusLabel(base string, args map[string]interface{}) string {
+	if p := strArg(args, "path"); p != "" {
+		return fmt.Sprintf("%s（%s）", base, filepath.Base(p))
+	}
+	return base
+}
+
+func memoryStatusLabel(args map[string]interface{}) string {
+	switch strArg(args, "action") {
+	case "read_long_term":
+		return "メモリ読み込み中..."
+	case "read_daily":
+		return "今日のメモ読み込み中..."
+	case "write_long_term":
+		return "メモリ書き込み中..."
+	case "append_daily":
+		return "今日のメモ追記中..."
+	default:
+		return "メモリ操作中..."
+	}
+}
+
+func skillStatusLabel(args map[string]interface{}) string {
+	switch strArg(args, "action") {
+	case "skill_list":
+		return "スキル一覧取得中..."
+	case "skill_read":
+		if n := strArg(args, "name"); n != "" {
+			return fmt.Sprintf("スキル読み込み中...（%s）", n)
+		}
+		return "スキル読み込み中..."
+	default:
+		return "スキル操作中..."
+	}
+}
+
+func cronStatusLabel(args map[string]interface{}) string {
+	switch strArg(args, "action") {
+	case "add":
+		return "リマインダー設定中..."
+	case "list":
+		return "スケジュール一覧取得中..."
+	case "remove":
+		return "スケジュール削除中..."
+	default:
+		return "スケジュール変更中..."
+	}
+}
+
+func i2cStatusLabel(args map[string]interface{}) string {
+	switch strArg(args, "action") {
+	case "detect":
+		return "I2Cバス検出中..."
+	case "scan":
+		if b := strArg(args, "bus"); b != "" {
+			return fmt.Sprintf("I2Cデバイススキャン中...（bus %s）", b)
+		}
+		return "I2Cデバイススキャン中..."
+	case "read":
+		if addr := intArg(args, "address"); addr > 0 {
+			return fmt.Sprintf("センサー読み取り中...（0x%02X）", addr)
+		}
+		return "センサー読み取り中..."
+	case "write":
+		if addr := intArg(args, "address"); addr > 0 {
+			return fmt.Sprintf("デバイス書き込み中...（0x%02X）", addr)
+		}
+		return "デバイス書き込み中..."
+	default:
+		return "I2C操作中..."
+	}
+}
+
+func spiStatusLabel(args map[string]interface{}) string {
+	switch strArg(args, "action") {
+	case "list":
+		return "SPIデバイス一覧取得中..."
+	case "transfer":
+		if d := strArg(args, "device"); d != "" {
+			return fmt.Sprintf("SPI通信中...（%s）", d)
+		}
+		return "SPI通信中..."
+	case "read":
+		if d := strArg(args, "device"); d != "" {
+			return fmt.Sprintf("SPI読み取り中...（%s）", d)
+		}
+		return "SPI読み取り中..."
+	default:
+		return "SPI操作中..."
+	}
+}
+
+// strArg extracts a string argument from a tool arguments map.
+func strArg(args map[string]interface{}, key string) string {
+	if v, ok := args[key]; ok {
+		if s, ok := v.(string); ok {
+			return s
+		}
+	}
+	return ""
+}
+
+// intArg extracts an integer argument from a tool arguments map.
+func intArg(args map[string]interface{}, key string) int {
+	if v, ok := args[key]; ok {
+		switch n := v.(type) {
+		case float64:
+			return int(n)
+		case int:
+			return n
+		}
+	}
+	return 0
+}
+
+// truncLabel truncates a string to maxRunes runes, appending "..." if truncated.
+func truncLabel(s string, maxRunes int) string {
+	if utf8.RuneCountInString(s) <= maxRunes {
+		return s
+	}
+	runes := []rune(s)
+	return string(runes[:maxRunes]) + "..."
+}
+
+// hostFromURL extracts the hostname from a URL string.
+func hostFromURL(rawURL string) string {
+	u, err := url.Parse(rawURL)
+	if err != nil || u.Host == "" {
+		return truncLabel(rawURL, 30)
+	}
+	return u.Host
+}

pkg/bus/types.go

@@ -14,6 +14,7 @@ type OutboundMessage struct {
 	Channel string `json:"channel"`
 	ChatID  string `json:"chat_id"`
 	Content string `json:"content"`
+	Type    string `json:"type,omitempty"` // "message" (default when empty), "status", "error"
 }
 
 type MessageHandler func(InboundMessage) error

pkg/channels/manager.go

@@ -274,6 +274,11 @@ func (m *Manager) dispatchOutbound(ctx context.Context) {
 				continue
 			}
 
+			// Status events are only supported by WebSocket clients
+			if msg.Type == "status" && msg.Channel != "websocket" {
+				continue
+			}
+
 			m.mu.RLock()
 			channel, exists := m.channels[msg.Channel]
 			m.mu.RUnlock()

pkg/channels/websocket.go

@@ -24,6 +24,7 @@ type wsIncoming struct {
 // wsOutgoing is the JSON message sent from picoclaw to APK.
 type wsOutgoing struct {
 	Content string `json:"content"`
+	Type    string `json:"type,omitempty"`
 }
 
 // WebSocketChannel is a server-side WebSocket channel that accepts
@@ -132,7 +133,7 @@ func (c *WebSocketChannel) Send(ctx context.Context, msg bus.OutboundMessage) er
 		return fmt.Errorf("no connection for chat %s", msg.ChatID)
 	}
 
-	out := wsOutgoing{Content: msg.Content}
+	out := wsOutgoing{Content: msg.Content, Type: msg.Type}
 	data, err := json.Marshal(out)
 	if err != nil {
 		return fmt.Errorf("failed to marshal response: %w", err)