feat: add message queue functionality with auto-send and queue mode toggle

- Improved development server hot module replacement (HMR) by reusing OpenCode processes.
- Introduced queued message mode with batching and idle auto-send, including support for attachments.
- Added a toggle for queue mode in OpenChamber settings with persistence across sessions.
- Updated various components to handle queued messages, including ChatInput and QueuedMessageChips.
- Modified settings payload and desktop settings to include queue mode configuration.
- Enhanced message sending logic to support additional parts for queued messages.

CHANGELOG.md

@@ -4,8 +4,12 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
-- Added Intel Mac (x86_64) support for the desktop application.
-- Build workflow now generates separate builds for Apple Silicon (arm64) and Intel (x86_64) Macs.
+- Added Intel Mac (x86_64) support for the desktop application (thanks to @rothnic).
+- Build workflow now generates separate builds for Apple Silicon (arm64) and Intel (x86_64) Macs (thanks to @rothnic).
+- Improved dev server HMR by reusing a healthy OpenCode process to avoid zombie instances.
+- Added queued message mode with chips, batching, and idle auto‑send (including attachments).
+- Added queue mode toggle to OpenChamber settings (chat section) with persistence across runtimes.
+
 
 ## [1.3.7] - 2025-12-28
 

packages/desktop/src-tauri/src/commands/settings.rs

@@ -152,6 +152,9 @@ fn sanitize_settings_update(payload: &Value) -> Value {
         if let Some(Value::Bool(b)) = obj.get("autoDeleteEnabled") {
             result_obj.insert("autoDeleteEnabled".to_string(), json!(b));
         }
+        if let Some(Value::Bool(b)) = obj.get("queueModeEnabled") {
+            result_obj.insert("queueModeEnabled".to_string(), json!(b));
+        }
 
         // Number fields
         if let Some(Value::Number(n)) = obj.get("autoDeleteAfterDays") {

packages/ui/src/components/chat/ChatInput.tsx

@@ -11,9 +11,11 @@ import {
 import { useSessionStore } from '@/stores/useSessionStore';
 import { useConfigStore } from '@/stores/useConfigStore';
 import { useUIStore } from '@/stores/useUIStore';
-import type { EditPermissionMode } from '@/stores/types/sessionTypes';
+import { useMessageQueueStore, type QueuedMessage } from '@/stores/messageQueueStore';
+import type { AttachedFile, EditPermissionMode } from '@/stores/types/sessionTypes';
 import { getEditModeColors } from '@/lib/permissions/editModeColors';
 import { AttachedFilesList } from './FileAttachment';
+import { QueuedMessageChips } from './QueuedMessageChips';
 import { FileMentionAutocomplete, type FileMentionHandle } from './FileMentionAutocomplete';
 import { CommandAutocomplete, type CommandAutocompleteHandle } from './CommandAutocomplete';
 import { AgentMentionAutocomplete, type AgentMentionAutocompleteHandle } from './AgentMentionAutocomplete';
@@ -23,6 +25,7 @@ import { ModelControls } from './ModelControls';
 import { parseAgentMentions } from '@/lib/messages/agentMentions';
 import { StatusRow } from './StatusRow';
 import { useAssistantStatus } from '@/hooks/useAssistantStatus';
+import { useCurrentSessionActivity } from '@/hooks/useSessionActivity';
 import { toast } from 'sonner';
 import { useFileStore } from '@/stores/fileStore';
 import { calculateEditPermissionUIState, type BashPermissionSetting } from '@/lib/permissions/editPermissionDefaults';
@@ -35,6 +38,7 @@ import {
 } from '@/components/ui/dropdown-menu';
 
 const MAX_VISIBLE_TEXTAREA_LINES = 8;
+const EMPTY_QUEUE: QueuedMessage[] = [];
 
 interface ChatInputProps {
     onOpenSettings?: () => void;
@@ -67,6 +71,7 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
     const abortPromptSessionId = useSessionStore((state) => state.abortPromptSessionId);
     const abortPromptExpiresAt = useSessionStore((state) => state.abortPromptExpiresAt);
     const clearAbortPrompt = useSessionStore((state) => state.clearAbortPrompt);
+    const sessionAbortFlags = useSessionStore((state) => state.sessionAbortFlags);
     const attachedFiles = useSessionStore((state) => state.attachedFiles);
     const addAttachedFile = useSessionStore((state) => state.addAttachedFile);
     const addServerFile = useSessionStore((state) => state.addServerFile);
@@ -84,6 +89,25 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
     const prevWasAbortedRef = React.useRef(false);
     const sendTriggeredByPointerDownRef = React.useRef(false);
 
+    // Message queue
+    const queueModeEnabled = useMessageQueueStore((state) => state.queueModeEnabled);
+    const queuedMessages = useMessageQueueStore(
+        React.useCallback(
+            (state) => {
+                if (!currentSessionId) return EMPTY_QUEUE;
+                return state.queuedMessages[currentSessionId] ?? EMPTY_QUEUE;
+            },
+            [currentSessionId]
+        )
+    );
+    const addToQueue = useMessageQueueStore((state) => state.addToQueue);
+    const clearQueue = useMessageQueueStore((state) => state.clearQueue);
+
+    // Session activity for auto-send on idle
+    const { phase: sessionPhase } = useCurrentSessionActivity();
+    const prevSessionPhaseRef = React.useRef(sessionPhase);
+    const autoSendTriggeredRef = React.useRef(false);
+
     const handleTextareaPointerDownCapture = React.useCallback((event: React.PointerEvent<HTMLTextAreaElement>) => {
         if (!isMobile) {
             return;
@@ -219,6 +243,8 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
     }, [chatInputAccent, softenBorderColor]);
 
     const hasContent = message.trim() || attachedFiles.length > 0;
+    const hasQueuedMessages = queuedMessages.length > 0;
+    const canSend = hasContent || hasQueuedMessages;
 
     const canAbort = working.isWorking;
 
@@ -227,16 +253,110 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
         return abortPromptSessionId === currentSessionId && Boolean(abortPromptExpiresAt);
     }, [abortPromptSessionId, abortPromptExpiresAt, currentSessionId]);
 
+    // Add message to queue instead of sending
+    const handleQueueMessage = React.useCallback(() => {
+        if (!hasContent || !currentSessionId) return;
+
+        const messageToQueue = message.replace(/^\n+|\n+$/g, '');
+        const attachmentsToQueue = attachedFiles.map((file) => ({ ...file }));
+
+        addToQueue(currentSessionId, {
+            content: messageToQueue,
+            attachments: attachmentsToQueue.length > 0 ? attachmentsToQueue : undefined,
+        });
+
+        // Clear input and attachments
+        setMessage('');
+        if (attachmentsToQueue.length > 0) {
+            clearAttachedFiles();
+        }
+
+        if (!isMobile) {
+            textareaRef.current?.focus();
+        }
+    }, [hasContent, currentSessionId, message, attachedFiles, addToQueue, clearAttachedFiles, isMobile]);
+
     const handleSubmit = async (e?: React.FormEvent) => {
         e?.preventDefault();
 
-        if (!hasContent || (!currentSessionId && !newSessionDraftOpen)) return;
-
-        const messageToSend = message.replace(/^\n+|\n+$/g, '');
+        if (!canSend || (!currentSessionId && !newSessionDraftOpen)) return;
 
         scrollToBottom?.({ instant: true, force: true });
 
-        const normalizedCommand = messageToSend.trimStart();
+        if (!currentProviderId || !currentModelId) {
+            console.warn('Cannot send message: provider or model not selected');
+            return;
+        }
+
+        // Build the primary message (first part) and additional parts
+        let primaryText = '';
+        let primaryAttachments: AttachedFile[] = [];
+        let agentMentionName: string | undefined;
+        const additionalParts: Array<{ text: string; attachments?: AttachedFile[] }> = [];
+
+        // Process queued messages first
+        for (let i = 0; i < queuedMessages.length; i++) {
+            const queuedMsg = queuedMessages[i];
+            const { sanitizedText, mention } = parseAgentMentions(queuedMsg.content, agents);
+            
+            // Use agent mention from first message that has one
+            if (!agentMentionName && mention?.name) {
+                agentMentionName = mention.name;
+            }
+
+            if (i === 0) {
+                // First queued message becomes primary
+                primaryText = sanitizedText;
+                primaryAttachments = queuedMsg.attachments ?? [];
+            } else {
+                // Subsequent queued messages become additional parts
+                additionalParts.push({
+                    text: sanitizedText,
+                    attachments: queuedMsg.attachments,
+                });
+            }
+        }
+
+        // Add current input
+        if (hasContent) {
+            const messageToSend = message.replace(/^\n+|\n+$/g, '');
+            const { sanitizedText, mention } = parseAgentMentions(messageToSend, agents);
+            const attachmentsToSend = attachedFiles.map((file) => ({ ...file }));
+
+            if (!agentMentionName && mention?.name) {
+                agentMentionName = mention.name;
+            }
+
+            if (queuedMessages.length === 0) {
+                // No queue - current input is primary
+                primaryText = sanitizedText;
+                primaryAttachments = attachmentsToSend;
+            } else {
+                // Has queue - current input is additional part
+                additionalParts.push({
+                    text: sanitizedText,
+                    attachments: attachmentsToSend.length > 0 ? attachmentsToSend : undefined,
+                });
+            }
+        }
+
+        if (!primaryText && additionalParts.length === 0) return;
+
+        // Clear queue and input
+        if (currentSessionId && hasQueuedMessages) {
+            clearQueue(currentSessionId);
+        }
+        setMessage('');
+        if (attachedFiles.length > 0) {
+            clearAttachedFiles();
+        }
+
+        if (isMobile) {
+            textareaRef.current?.blur();
+        }
+
+        // Handle /summarize command scroll
+        const normalizedCommand = primaryText.trimStart();
         if (normalizedCommand.startsWith('/')) {
             const commandName = normalizedCommand
                 .slice(1)
@@ -248,29 +368,21 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
             }
         }
 
-        if (!currentProviderId || !currentModelId) {
+        // Collect all attachments for error recovery
+        const allAttachments = [
+            ...primaryAttachments,
+            ...additionalParts.flatMap(p => p.attachments ?? []),
+        ];
 
-            console.warn('Cannot send message: provider or model not selected');
-            return;
-        }
-
-        const { sanitizedText, mention } = parseAgentMentions(messageToSend, agents);
-        const agentMentionName = mention?.name;
-
-        const attachmentsToSend = attachedFiles.map((file) => ({ ...file }));
-        if (attachmentsToSend.length > 0) {
-            clearAttachedFiles();
-        }
-
-        setMessage('');
-
-        if (isMobile) {
-            textareaRef.current?.blur();
-        }
- 
-        await sendMessage(sanitizedText, currentProviderId, currentModelId, currentAgentName, attachmentsToSend, agentMentionName)
-
-            .catch((error: unknown) => {
+        await sendMessage(
+            primaryText, 
+            currentProviderId, 
+            currentModelId, 
+            currentAgentName, 
+            primaryAttachments, 
+            agentMentionName,
+            additionalParts.length > 0 ? additionalParts : undefined
+        ).catch((error: unknown) => {
                 const rawMessage =
                     error instanceof Error
                         ? error.message
@@ -293,12 +405,11 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
                     normalized === 'failed to send message';
 
                 if (isSoftNetworkError) {
-
                     return;
                 }
 
-                if (attachmentsToSend.length > 0) {
-                    useFileStore.setState({ attachedFiles: attachmentsToSend });
+                if (allAttachments.length > 0) {
+                    useFileStore.setState({ attachedFiles: allAttachments });
                 }
                 toast.error(rawMessage || 'Message failed to send. Attachments restored.');
             });
@@ -306,9 +417,42 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
         if (!isMobile) {
             textareaRef.current?.focus();
         }
-
     };
 
+    // Keep a ref to handleSubmit for auto-send effect
+    const handleSubmitRef = React.useRef(handleSubmit);
+    handleSubmitRef.current = handleSubmit;
+
+    // Auto-send queued messages when session becomes idle (but not after abort)
+    React.useEffect(() => {
+        const wasWorking = prevSessionPhaseRef.current === 'busy' || prevSessionPhaseRef.current === 'cooldown';
+        const isNowIdle = sessionPhase === 'idle';
+        
+        // Check if session was recently aborted (within last 2 seconds)
+        const wasRecentlyAborted = currentSessionId && sessionAbortFlags.has(currentSessionId) && (() => {
+            const abortRecord = sessionAbortFlags.get(currentSessionId);
+            if (!abortRecord) return false;
+            const timeSinceAbort = Date.now() - abortRecord.timestamp;
+            return timeSinceAbort < 2000;
+        })();
+        
+        // Detect transition from working to idle, but skip if aborted
+        if (wasWorking && isNowIdle && queuedMessages.length > 0 && !autoSendTriggeredRef.current && !wasRecentlyAborted) {
+            // Prevent double-triggering
+            autoSendTriggeredRef.current = true;
+            
+            // Use setTimeout to avoid calling during render
+            setTimeout(() => {
+                if (currentSessionId && currentProviderId && currentModelId) {
+                    void handleSubmitRef.current();
+                }
+                autoSendTriggeredRef.current = false;
+            }, 100);
+        }
+        
+        prevSessionPhaseRef.current = sessionPhase;
+    }, [sessionPhase, queuedMessages.length, currentSessionId, currentProviderId, currentModelId, sessionAbortFlags]);
+
     const handleKeyDown = (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
 
         if (showCommandAutocomplete && commandRef.current) {
@@ -341,9 +485,35 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
             return;
         }
 
+        // Handle Enter/Ctrl+Enter based on queue mode
         if (e.key === 'Enter' && !e.shiftKey && !isMobile) {
             e.preventDefault();
-            handleSubmit();
+            
+            const isCtrlEnter = e.ctrlKey || e.metaKey;
+            
+            // Queue mode: Enter queues, Ctrl+Enter sends
+            // Normal mode: Enter sends, Ctrl+Enter queues
+            // Note: Queueing only works when there's an existing session (currentSessionId)
+            // For new sessions (draft), always send immediately
+            const canQueue = hasContent && currentSessionId;
+            
+            if (queueModeEnabled) {
+                if (isCtrlEnter || !canQueue) {
+                    // Ctrl+Enter sends, or Enter when can't queue (new session)
+                    handleSubmit();
+                } else {
+                    // Enter queues when we have a session
+                    handleQueueMessage();
+                }
+            } else {
+                if (isCtrlEnter && canQueue) {
+                    // Ctrl+Enter queues when we have a session
+                    handleQueueMessage();
+                } else {
+                    // Enter sends
+                    handleSubmit();
+                }
+            }
         }
     };
 
@@ -839,13 +1009,13 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
     ) : (
         <button
             type={isMobile ? 'button' : 'submit'}
-            disabled={!hasContent || (!currentSessionId && !newSessionDraftOpen)}
+            disabled={!canSend || (!currentSessionId && !newSessionDraftOpen)}
             onPointerDownCapture={(event) => {
                 if (!isMobile || event.pointerType !== 'touch') {
                     return;
                 }
 
-                if (!hasContent || (!currentSessionId && !newSessionDraftOpen)) {
+                if (!canSend || (!currentSessionId && !newSessionDraftOpen)) {
                     return;
                 }
 
@@ -869,7 +1039,7 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
             }}
             className={cn(
                 iconButtonBaseClass,
-                hasContent && (currentSessionId || newSessionDraftOpen)
+                canSend && (currentSessionId || newSessionDraftOpen)
                     ? 'text-primary hover:text-primary'
                     : 'opacity-30'
             )}
@@ -1040,6 +1210,14 @@ export const ChatInput: React.FC<ChatInputProps> = ({ onOpenSettings, scrollToBo
                     </div>
                 )}
                 <AttachedFilesList />
+                <QueuedMessageChips 
+                    onEditMessage={(content) => {
+                        setMessage(content);
+                        setTimeout(() => {
+                            textareaRef.current?.focus();
+                        }, 0);
+                    }} 
+                />
                 <div
                     className={cn(
                         "rounded-xl border border-border/80 bg-input/10 dark:bg-input/30",

packages/ui/src/components/chat/QueuedMessageChips.tsx

@@ -0,0 +1,117 @@
+import React, { memo } from 'react';
+import { RiCloseLine, RiMessage2Line } from '@remixicon/react';
+import { useMessageQueueStore, type QueuedMessage } from '@/stores/messageQueueStore';
+import { useSessionStore } from '@/stores/useSessionStore';
+import { useFileStore } from '@/stores/fileStore';
+
+interface QueuedMessageChipProps {
+    message: QueuedMessage;
+    sessionId: string;
+    onEdit: (message: QueuedMessage) => void;
+}
+
+const QueuedMessageChip = memo(({ message, sessionId, onEdit }: QueuedMessageChipProps) => {
+    const removeFromQueue = useMessageQueueStore((state) => state.removeFromQueue);
+
+    // Get first line of message, truncated
+    const firstLine = React.useMemo(() => {
+        const lines = message.content.split('\n');
+        const first = lines[0] || '';
+        const maxLength = 50;
+        if (first.length > maxLength) {
+            return first.substring(0, maxLength) + '...';
+        }
+        return first + (lines.length > 1 ? '...' : '');
+    }, [message.content]);
+
+    const attachmentCount = message.attachments?.length ?? 0;
+
+    return (
+        <div className="inline-flex items-center gap-1.5 px-2.5 py-1 bg-muted/30 border border-border/30 rounded-xl typography-meta group">
+            <RiMessage2Line className="h-3 w-3 text-muted-foreground flex-shrink-0" />
+            <button
+                type="button"
+                onClick={() => onEdit(message)}
+                className="flex items-center gap-1.5 hover:text-foreground transition-colors text-left"
+                title="Click to edit"
+            >
+                <span className="truncate max-w-[200px]">
+                    {firstLine || '(empty)'}
+                </span>
+                {attachmentCount > 0 && (
+                    <span className="text-muted-foreground flex-shrink-0">
+                        +{attachmentCount} file{attachmentCount > 1 ? 's' : ''}
+                    </span>
+                )}
+            </button>
+            <button
+                type="button"
+                onClick={() => removeFromQueue(sessionId, message.id)}
+                className="ml-1 hover:text-destructive p-0.5 opacity-60 group-hover:opacity-100 transition-opacity"
+                title="Remove from queue"
+            >
+                <RiCloseLine className="h-3 w-3" />
+            </button>
+        </div>
+    );
+});
+
+QueuedMessageChip.displayName = 'QueuedMessageChip';
+
+interface QueuedMessageChipsProps {
+    onEditMessage: (content: string, attachments?: QueuedMessage['attachments']) => void;
+}
+
+const EMPTY_QUEUE: QueuedMessage[] = [];
+
+export const QueuedMessageChips = memo(({ onEditMessage }: QueuedMessageChipsProps) => {
+    const currentSessionId = useSessionStore((state) => state.currentSessionId);
+    const queuedMessages = useMessageQueueStore(
+        React.useCallback(
+            (state) => {
+                if (!currentSessionId) return EMPTY_QUEUE;
+                return state.queuedMessages[currentSessionId] ?? EMPTY_QUEUE;
+            },
+            [currentSessionId]
+        )
+    );
+    const popToInput = useMessageQueueStore((state) => state.popToInput);
+
+    const handleEdit = React.useCallback((message: QueuedMessage) => {
+        if (!currentSessionId) return;
+        
+        const popped = popToInput(currentSessionId, message.id);
+        if (popped) {
+            // Restore attachments to file store if any
+            if (popped.attachments && popped.attachments.length > 0) {
+                const currentAttachments = useFileStore.getState().attachedFiles;
+                useFileStore.setState({ 
+                    attachedFiles: [...currentAttachments, ...popped.attachments] 
+                });
+            }
+            onEditMessage(popped.content, popped.attachments);
+        }
+    }, [currentSessionId, popToInput, onEditMessage]);
+
+    if (queuedMessages.length === 0 || !currentSessionId) {
+        return null;
+    }
+
+    return (
+        <div className="pb-2">
+            <div className="flex items-center flex-wrap gap-2 px-3 py-2 bg-muted/30 rounded-xl border border-border/30">
+                <span className="typography-meta text-muted-foreground font-medium">Queued:</span>
+                {queuedMessages.map((message) => (
+                    <QueuedMessageChip
+                        key={message.id}
+                        message={message}
+                        sessionId={currentSessionId}
+                        onEdit={handleEdit}
+                    />
+                ))}
+            </div>
+        </div>
+    );
+});
+
+QueuedMessageChips.displayName = 'QueuedMessageChips';

packages/ui/src/components/sections/openchamber/OpenChamberPage.tsx

@@ -69,9 +69,9 @@ const VisualSectionContent: React.FC = () => {
     return <OpenChamberVisualSettings visibleSettings={['theme', 'fontSize', 'spacing']} />;
 };
 
-// Chat section: Default Tool Output, Diff layout, Show reasoning traces
+// Chat section: Default Tool Output, Diff layout, Show reasoning traces, Queue mode
 const ChatSectionContent: React.FC = () => {
-    return <OpenChamberVisualSettings visibleSettings={['toolOutput', 'diffLayout', 'reasoning']} />;
+    return <OpenChamberVisualSettings visibleSettings={['toolOutput', 'diffLayout', 'reasoning', 'queueMode']} />;
 };
 
 // Sessions section: Default model & agent, Session retention

packages/ui/src/components/sections/openchamber/OpenChamberVisualSettings.tsx

@@ -4,6 +4,7 @@ import { RiRestartLine } from '@remixicon/react';
 import { useThemeSystem } from '@/contexts/useThemeSystem';
 import type { ThemeMode } from '@/types/theme';
 import { useUIStore } from '@/stores/useUIStore';
+import { useMessageQueueStore } from '@/stores/messageQueueStore';
 import { cn } from '@/lib/utils';
 import { ButtonSmall } from '@/components/ui/button-small';
 import { NumberInput } from '@/components/ui/number-input';
@@ -55,7 +56,7 @@ const DIFF_LAYOUT_OPTIONS: Option<'dynamic' | 'inline' | 'side-by-side'>[] = [
     },
 ];
 
-export type VisibleSetting = 'theme' | 'fontSize' | 'spacing' | 'toolOutput' | 'diffLayout' | 'reasoning';
+export type VisibleSetting = 'theme' | 'fontSize' | 'spacing' | 'toolOutput' | 'diffLayout' | 'reasoning' | 'queueMode';
 
 interface OpenChamberVisualSettingsProps {
     /** Which settings to show. If undefined, shows all. */
@@ -74,6 +75,8 @@ export const OpenChamberVisualSettings: React.FC<OpenChamberVisualSettingsProps>
     const setPadding = useUIStore(state => state.setPadding);
     const diffLayoutPreference = useUIStore(state => state.diffLayoutPreference);
     const setDiffLayoutPreference = useUIStore(state => state.setDiffLayoutPreference);
+    const queueModeEnabled = useMessageQueueStore(state => state.queueModeEnabled);
+    const setQueueMode = useMessageQueueStore(state => state.setQueueMode);
     const {
         themeMode,
         setThemeMode,
@@ -292,6 +295,27 @@ export const OpenChamberVisualSettings: React.FC<OpenChamberVisualSettingsProps>
                     </span>
                 </label>
             )}
+
+            {shouldShow('queueMode') && (
+                <div className="space-y-2">
+                    <label className="flex items-center gap-2 cursor-pointer">
+                        <input
+                            type="checkbox"
+                            className="h-3.5 w-3.5 accent-primary"
+                            checked={queueModeEnabled}
+                            onChange={(event) => setQueueMode(event.target.checked)}
+                        />
+                        <span className="typography-ui-header font-semibold text-foreground">
+                            Queue messages by default
+                        </span>
+                    </label>
+                    <p className="typography-meta text-muted-foreground pl-5">
+                        {queueModeEnabled 
+                            ? 'Enter queues messages, Ctrl+Enter sends immediately.' 
+                            : 'Enter sends immediately, Ctrl+Enter queues messages.'}
+                    </p>
+                </div>
+            )}
         </div>
     );
 };

packages/ui/src/lib/api/types.ts

@@ -332,6 +332,7 @@ export interface SettingsPayload {
   showReasoningTraces?: boolean;
   autoDeleteEnabled?: boolean;
   autoDeleteAfterDays?: number;
+  queueModeEnabled?: boolean;
 
   [key: string]: unknown;
 }

packages/ui/src/lib/desktop.ts

@@ -43,6 +43,7 @@ export type DesktopSettings = {
   autoDeleteAfterDays?: number;
   defaultModel?: string; // format: "provider/model"
   defaultAgent?: string;
+  queueModeEnabled?: boolean;
 };
 
 export type DesktopSettingsApi = {

packages/ui/src/lib/opencode/client.ts

@@ -393,6 +393,16 @@ class OpencodeService {
       filename?: string;
       url: string;
     }>;
+    /** Additional text/file parts to include (for batch sending queued messages) */
+    additionalParts?: Array<{
+      text: string;
+      files?: Array<{
+        type: 'file';
+        mime: string;
+        filename?: string;
+        url: string;
+      }>;
+    }>;
     messageId?: string;
     agentMentions?: Array<{ name: string; source?: { value: string; start: number; end: number } }>;
   }): Promise<string> {
@@ -433,6 +443,28 @@ class OpencodeService {
       });
     }
 
+    // Add additional parts (for batch/queued messages)
+    if (params.additionalParts && params.additionalParts.length > 0) {
+      for (const additional of params.additionalParts) {
+        if (additional.text && additional.text.trim()) {
+          parts.push({
+            type: 'text',
+            text: additional.text
+          });
+        }
+        if (additional.files && additional.files.length > 0) {
+          for (const file of additional.files) {
+            parts.push({
+              type: 'file',
+              mime: file.mime,
+              filename: file.filename,
+              url: file.url
+            });
+          }
+        }
+      }
+    }
+
     if (params.agentMentions && params.agentMentions.length > 0) {
       const [first] = params.agentMentions;
       if (first?.name) {

packages/ui/src/lib/persistence.ts

@@ -1,6 +1,7 @@
 import { getDesktopSettings, updateDesktopSettings as updateDesktopSettingsApi, isDesktopRuntime } from '@/lib/desktop';
 import type { DesktopSettings } from '@/lib/desktop';
 import { useUIStore } from '@/stores/useUIStore';
+import { useMessageQueueStore } from '@/stores/messageQueueStore';
 import { loadAppearancePreferences, applyAppearancePreferences } from '@/lib/appearancePersistence';
 import { getRegisteredRuntimeAPIs } from '@/contexts/runtimeAPIRegistry';
 
@@ -55,6 +56,7 @@ const getRuntimeSettingsAPI = () => getRegisteredRuntimeAPIs()?.settings ?? null
 
 const applyDesktopUiPreferences = (settings: DesktopSettings) => {
   const store = useUIStore.getState();
+  const queueStore = useMessageQueueStore.getState();
 
   if (typeof settings.showReasoningTraces === 'boolean' && settings.showReasoningTraces !== store.showReasoningTraces) {
     store.setShowReasoningTraces(settings.showReasoningTraces);
@@ -68,6 +70,9 @@ const applyDesktopUiPreferences = (settings: DesktopSettings) => {
       store.setAutoDeleteAfterDays(normalized);
     }
   }
+  if (typeof settings.queueModeEnabled === 'boolean' && settings.queueModeEnabled !== queueStore.queueModeEnabled) {
+    queueStore.setQueueMode(settings.queueModeEnabled);
+  }
 };
 
 const sanitizeWebSettings = (payload: unknown): DesktopSettings | null => {
@@ -131,6 +136,9 @@ const sanitizeWebSettings = (payload: unknown): DesktopSettings | null => {
   if (typeof candidate.defaultAgent === 'string' && candidate.defaultAgent.length > 0) {
     result.defaultAgent = candidate.defaultAgent;
   }
+  if (typeof candidate.queueModeEnabled === 'boolean') {
+    result.queueModeEnabled = candidate.queueModeEnabled;
+  }
 
   return result;
 };

packages/ui/src/stores/messageQueueStore.ts

@@ -0,0 +1,144 @@
+import { create } from 'zustand';
+import { devtools, persist, createJSONStorage } from 'zustand/middleware';
+import { getSafeStorage } from './utils/safeStorage';
+import type { AttachedFile } from './types/sessionTypes';
+import { updateDesktopSettings } from '@/lib/persistence';
+
+export interface QueuedMessage {
+    id: string;
+    content: string;
+    attachments?: AttachedFile[];
+    createdAt: number;
+}
+
+interface MessageQueueState {
+    queuedMessages: Record<string, QueuedMessage[]>; // sessionId → queue
+    queueModeEnabled: boolean; // global toggle
+}
+
+interface MessageQueueActions {
+    addToQueue: (sessionId: string, message: Omit<QueuedMessage, 'id' | 'createdAt'>) => void;
+    removeFromQueue: (sessionId: string, messageId: string) => void;
+    popToInput: (sessionId: string, messageId: string) => QueuedMessage | null;
+    clearQueue: (sessionId: string) => void;
+    clearAllQueues: () => void;
+    setQueueMode: (enabled: boolean) => void;
+    getQueueForSession: (sessionId: string) => QueuedMessage[];
+}
+
+type MessageQueueStore = MessageQueueState & MessageQueueActions;
+
+export const useMessageQueueStore = create<MessageQueueStore>()(
+    devtools(
+        persist(
+            (set, get) => ({
+                queuedMessages: {},
+                queueModeEnabled: false,
+
+                addToQueue: (sessionId, message) => {
+                    const id = `queued-${Date.now()}-${Math.random().toString(36).substring(2, 9)}`;
+                    const queuedMessage: QueuedMessage = {
+                        id,
+                        content: message.content,
+                        attachments: message.attachments,
+                        createdAt: Date.now(),
+                    };
+
+                    set((state) => {
+                        const currentQueue = state.queuedMessages[sessionId] ?? [];
+                        return {
+                            queuedMessages: {
+                                ...state.queuedMessages,
+                                [sessionId]: [...currentQueue, queuedMessage],
+                            },
+                        };
+                    });
+                },
+
+                removeFromQueue: (sessionId, messageId) => {
+                    set((state) => {
+                        const currentQueue = state.queuedMessages[sessionId] ?? [];
+                        const newQueue = currentQueue.filter((m) => m.id !== messageId);
+                        
+                        if (newQueue.length === 0) {
+                            const { [sessionId]: _removed, ...rest } = state.queuedMessages;
+                            void _removed;
+                            return { queuedMessages: rest };
+                        }
+                        
+                        return {
+                            queuedMessages: {
+                                ...state.queuedMessages,
+                                [sessionId]: newQueue,
+                            },
+                        };
+                    });
+                },
+
+                popToInput: (sessionId, messageId) => {
+                    const state = get();
+                    const currentQueue = state.queuedMessages[sessionId] ?? [];
+                    const message = currentQueue.find((m) => m.id === messageId);
+                    
+                    if (!message) {
+                        return null;
+                    }
+
+                    // Remove from queue
+                    set((prevState) => {
+                        const queue = prevState.queuedMessages[sessionId] ?? [];
+                        const newQueue = queue.filter((m) => m.id !== messageId);
+                        
+                        if (newQueue.length === 0) {
+                            const { [sessionId]: _removed, ...rest } = prevState.queuedMessages;
+                            void _removed;
+                            return { queuedMessages: rest };
+                        }
+                        
+                        return {
+                            queuedMessages: {
+                                ...prevState.queuedMessages,
+                                [sessionId]: newQueue,
+                            },
+                        };
+                    });
+
+                    return message;
+                },
+
+                clearQueue: (sessionId) => {
+                    set((state) => {
+                        const { [sessionId]: _removed, ...rest } = state.queuedMessages;
+                        void _removed;
+                        return { queuedMessages: rest };
+                    });
+                },
+
+                clearAllQueues: () => {
+                    set({ queuedMessages: {} });
+                },
+
+                setQueueMode: (enabled) => {
+                    set({ queueModeEnabled: enabled });
+                    // Persist to settings.json (async, fire-and-forget)
+                    void updateDesktopSettings({ queueModeEnabled: enabled });
+                },
+
+                getQueueForSession: (sessionId) => {
+                    return get().queuedMessages[sessionId] ?? [];
+                },
+            }),
+            {
+                name: 'message-queue-store',
+                storage: createJSONStorage(() => getSafeStorage()),
+                partialize: (state) => ({
+                    queuedMessages: state.queuedMessages,
+                    queueModeEnabled: state.queueModeEnabled,
+                }),
+            }
+        ),
+        {
+            name: 'message-queue-store',
+        }
+    )
+);

packages/ui/src/stores/messageStore.ts

@@ -351,7 +351,7 @@ interface MessageState {
 
 interface MessageActions {
     loadMessages: (sessionId: string) => Promise<void>;
-    sendMessage: (content: string, providerID: string, modelID: string, agent?: string, currentSessionId?: string, attachments?: AttachedFile[], agentMentionName?: string | null) => Promise<void>;
+    sendMessage: (content: string, providerID: string, modelID: string, agent?: string, currentSessionId?: string, attachments?: AttachedFile[], agentMentionName?: string | null, additionalParts?: Array<{ text: string; attachments?: AttachedFile[] }>) => Promise<void>;
     abortCurrentOperation: (currentSessionId?: string) => Promise<void>;
     _addStreamingPartImmediate: (sessionId: string, messageId: string, part: Part, role?: string, currentSessionId?: string) => void;
     addStreamingPart: (sessionId: string, messageId: string, part: Part, role?: string, currentSessionId?: string) => void;
@@ -551,7 +551,7 @@ export const useMessageStore = create<MessageStore>()(
                         });
                 },
 
-                sendMessage: async (content: string, providerID: string, modelID: string, agent?: string, currentSessionId?: string, attachments?: AttachedFile[], agentMentionName?: string | null) => {
+                sendMessage: async (content: string, providerID: string, modelID: string, agent?: string, currentSessionId?: string, attachments?: AttachedFile[], agentMentionName?: string | null, additionalParts?: Array<{ text: string; attachments?: AttachedFile[] }>) => {
                     if (!currentSessionId) {
                         throw new Error("No session selected");
                     }
@@ -676,6 +676,17 @@ export const useMessageStore = create<MessageStore>()(
                                     return { pendingAssistantHeaderSessions: next, pendingUserMessageMetaBySession: nextUserMeta };
                                 });
 
+                                // Convert additional parts to SDK format
+                                const additionalPartsPayload = additionalParts?.map((part) => ({
+                                    text: part.text,
+                                    files: part.attachments?.map((file) => ({
+                                        type: "file" as const,
+                                        mime: file.mimeType,
+                                        filename: file.filename,
+                                        url: file.dataUrl,
+                                    })),
+                                }));
+
                                 await opencodeClient.sendMessage({
                                     id: sessionId,
                                     providerID,
@@ -683,6 +694,7 @@ export const useMessageStore = create<MessageStore>()(
                                     text: effectiveContent,
                                     agent,
                                     files: filePayloads.length > 0 ? filePayloads : undefined,
+                                    additionalParts: additionalPartsPayload,
                                     agentMentions: agentMentionName ? [{ name: agentMentionName }] : undefined,
                                 });
 

packages/ui/src/stores/types/sessionTypes.ts

@@ -125,7 +125,7 @@ export interface SessionStore {
     unshareSession: (id: string) => Promise<Session | null>;
     setCurrentSession: (id: string | null) => void;
     loadMessages: (sessionId: string) => Promise<void>;
-    sendMessage: (content: string, providerID: string, modelID: string, agent?: string, attachments?: AttachedFile[], agentMentionName?: string) => Promise<void>;
+    sendMessage: (content: string, providerID: string, modelID: string, agent?: string, attachments?: AttachedFile[], agentMentionName?: string, additionalParts?: Array<{ text: string; attachments?: AttachedFile[] }>) => Promise<void>;
     abortCurrentOperation: () => Promise<void>;
     acknowledgeSessionAbort: (sessionId: string) => void;
     armAbortPrompt: (durationMs?: number) => number | null;

packages/ui/src/stores/useSessionStore.ts

@@ -278,7 +278,7 @@ export const useSessionStore = create<SessionStore>()(
                     get().evictLeastRecentlyUsed();
                 },
                 loadMessages: (sessionId: string) => useMessageStore.getState().loadMessages(sessionId),
-                sendMessage: async (content: string, providerID: string, modelID: string, agent?: string, attachments?: AttachedFile[], agentMentionName?: string) => {
+                sendMessage: async (content: string, providerID: string, modelID: string, agent?: string, attachments?: AttachedFile[], agentMentionName?: string, additionalParts?: Array<{ text: string; attachments?: AttachedFile[] }>) => {
                     const draft = get().newSessionDraft;
                     const trimmedAgent = typeof agent === 'string' && agent.trim().length > 0 ? agent.trim() : undefined;
 
@@ -353,7 +353,7 @@ export const useSessionStore = create<SessionStore>()(
                         try {
                             return await useMessageStore
                                 .getState()
-                                .sendMessage(content, providerID, modelID, effectiveDraftAgent, created.id, attachments, agentMentionName);
+                                .sendMessage(content, providerID, modelID, effectiveDraftAgent, created.id, attachments, agentMentionName, additionalParts);
                         } catch (error) {
                             setIdlePhase(created.id);
                             throw error;
@@ -380,7 +380,7 @@ export const useSessionStore = create<SessionStore>()(
                     }
 
                     try {
-                        return await useMessageStore.getState().sendMessage(content, providerID, modelID, effectiveAgent, currentSessionId || undefined, attachments, agentMentionName);
+                        return await useMessageStore.getState().sendMessage(content, providerID, modelID, effectiveAgent, currentSessionId || undefined, attachments, agentMentionName, additionalParts);
                     } catch (error) {
                         if (currentSessionId) {
                             setIdlePhase(currentSessionId);

packages/web/server/index.js

@@ -421,6 +421,9 @@ const sanitizeSettingsUpdate = (payload) => {
   if (typeof candidate.defaultAgent === 'string' && candidate.defaultAgent.length > 0) {
     result.defaultAgent = candidate.defaultAgent;
   }
+  if (typeof candidate.queueModeEnabled === 'boolean') {
+    result.queueModeEnabled = candidate.queueModeEnabled;
+  }
 
   return result;
 };
@@ -501,12 +504,26 @@ const persistSettings = async (changes) => {
   return formatSettingsResponse(next);
 };
 
-// Global state
-let openCodeProcess = null;
-let openCodePort = null;
+// HMR-persistent state via globalThis
+// These values survive Vite HMR reloads to prevent zombie OpenCode processes
+const HMR_STATE_KEY = '__openchamberHmrState';
+const getHmrState = () => {
+  if (!globalThis[HMR_STATE_KEY]) {
+    globalThis[HMR_STATE_KEY] = {
+      openCodeProcess: null,
+      openCodePort: null,
+      openCodeWorkingDirectory: process.cwd(),
+      isShuttingDown: false,
+      signalsAttached: false,
+    };
+  }
+  return globalThis[HMR_STATE_KEY];
+};
+const hmrState = getHmrState();
+
+// Non-HMR state (safe to reset on reload)
 let healthCheckInterval = null;
 let server = null;
-let isShuttingDown = false;
 let cachedModelsMetadata = null;
 let cachedModelsMetadataTimestamp = 0;
 let expressApp = null;
@@ -522,10 +539,60 @@ let openCodePortWaiters = [];
 let isOpenCodeReady = false;
 let openCodeNotReadySince = 0;
 let exitOnShutdown = true;
-let signalsAttached = false;
-let openCodeWorkingDirectory = process.cwd();
 let uiAuthController = null;
 
+// Sync helper - call after modifying any HMR state variable
+const syncToHmrState = () => {
+  hmrState.openCodeProcess = openCodeProcess;
+  hmrState.openCodePort = openCodePort;
+  hmrState.isShuttingDown = isShuttingDown;
+  hmrState.signalsAttached = signalsAttached;
+  hmrState.openCodeWorkingDirectory = openCodeWorkingDirectory;
+};
+
+// Sync helper - call to restore state from HMR (e.g., on module reload)
+const syncFromHmrState = () => {
+  openCodeProcess = hmrState.openCodeProcess;
+  openCodePort = hmrState.openCodePort;
+  isShuttingDown = hmrState.isShuttingDown;
+  signalsAttached = hmrState.signalsAttached;
+  openCodeWorkingDirectory = hmrState.openCodeWorkingDirectory;
+};
+
+// Module-level variables that shadow HMR state
+// These are synced to/from hmrState to survive HMR reloads
+let openCodeProcess = hmrState.openCodeProcess;
+let openCodePort = hmrState.openCodePort;
+let isShuttingDown = hmrState.isShuttingDown;
+let signalsAttached = hmrState.signalsAttached;
+let openCodeWorkingDirectory = hmrState.openCodeWorkingDirectory;
+
+/**
+ * Check if an existing OpenCode process is still alive and responding
+ * Used to reuse process across HMR reloads
+ */
+async function isOpenCodeProcessHealthy() {
+  if (!openCodeProcess || !openCodePort) {
+    return false;
+  }
+
+  // Check if process is still running
+  if (openCodeProcess.exitCode !== null || openCodeProcess.signalCode !== null) {
+    return false;
+  }
+
+  // Health check via HTTP
+  try {
+    const response = await fetch(`http://127.0.0.1:${openCodePort}/session`, {
+      method: 'GET',
+      signal: AbortSignal.timeout(2000),
+    });
+    return response.ok;
+  } catch {
+    return false;
+  }
+}
+
 const OPENCODE_BINARY_ENV =
   process.env.OPENCODE_BINARY ||
   process.env.OPENCHAMBER_BINARY ||
@@ -657,6 +724,7 @@ function setOpenCodePort(port) {
 
   if (portChanged || openCodePort === null) {
     openCodePort = numericPort;
+    syncToHmrState();
     console.log(`Detected OpenCode port: ${openCodePort}`);
 
     if (portChanged) {
@@ -1165,6 +1233,7 @@ async function startOpenCode() {
   }).catch((error) => {
     lastOpenCodeError = error.message;
     openCodePort = null;
+    syncToHmrState();
     settleFirstSignal();
     return error;
   });
@@ -1285,6 +1354,7 @@ async function restartOpenCode() {
       }
 
       openCodeProcess = null;
+      syncToHmrState();
 
       await new Promise((resolve) => setTimeout(resolve, 250));
     }
@@ -1294,6 +1364,7 @@ async function restartOpenCode() {
       setOpenCodePort(ENV_CONFIGURED_OPENCODE_PORT);
     } else {
       openCodePort = null;
+      syncToHmrState();
     }
     openCodeApiPrefixDetected = false;
     if (openCodeApiDetectionTimer) {
@@ -1304,6 +1375,7 @@ async function restartOpenCode() {
 
     lastOpenCodeError = null;
     openCodeProcess = await startOpenCode();
+    syncToHmrState();
 
     if (!ENV_CONFIGURED_OPENCODE_PORT) {
       await waitForOpenCodePort();
@@ -1322,6 +1394,7 @@ async function restartOpenCode() {
     lastOpenCodeError = error.message;
     if (!ENV_CONFIGURED_OPENCODE_PORT) {
       openCodePort = null;
+      syncToHmrState();
     }
     openCodeApiPrefixDetected = false;
     throw error;
@@ -1684,6 +1757,7 @@ async function gracefulShutdown(options = {}) {
   if (isShuttingDown) return;
 
   isShuttingDown = true;
+  syncToHmrState();
   console.log('Starting graceful shutdown...');
   const exitProcess = typeof options.exitProcess === 'boolean' ? options.exitProcess : exitOnShutdown;
 
@@ -3026,6 +3100,7 @@ async function main(options = {}) {
       }
 
       openCodeWorkingDirectory = resolvedPath;
+      syncToHmrState();
 
       await refreshOpenCodeAfterConfigChange('directory change');
 
@@ -3489,15 +3564,24 @@ async function main(options = {}) {
   });
 
   try {
-    if (ENV_CONFIGURED_OPENCODE_PORT) {
-      console.log(`Using OpenCode port from environment: ${ENV_CONFIGURED_OPENCODE_PORT}`);
-      setOpenCodePort(ENV_CONFIGURED_OPENCODE_PORT);
+    // Check if we can reuse an existing OpenCode process from a previous HMR cycle
+    syncFromHmrState();
+    if (await isOpenCodeProcessHealthy()) {
+      console.log(`[HMR] Reusing existing OpenCode process on port ${openCodePort}`);
     } else {
-      openCodePort = null;
-    }
+      // No healthy process, start fresh
+      if (ENV_CONFIGURED_OPENCODE_PORT) {
+        console.log(`Using OpenCode port from environment: ${ENV_CONFIGURED_OPENCODE_PORT}`);
+        setOpenCodePort(ENV_CONFIGURED_OPENCODE_PORT);
+      } else {
+        openCodePort = null;
+        syncToHmrState();
+      }
 
-    lastOpenCodeError = null;
-    openCodeProcess = await startOpenCode();
+      lastOpenCodeError = null;
+      openCodeProcess = await startOpenCode();
+      syncToHmrState();
+    }
     await waitForOpenCodePort();
     try {
       await waitForOpenCodeReady();
@@ -3555,6 +3639,7 @@ async function main(options = {}) {
     process.on('SIGINT', gracefulShutdown);
     process.on('SIGQUIT', gracefulShutdown);
     signalsAttached = true;
+    syncToHmrState();
   }
 
   process.on('unhandledRejection', (reason, promise) => {