ui: Add Thinking mode toggle with reasoning effort levels + improvements for Chat Form Add Action UI (#23434)

* feat: Add "Thinking" toggle and status icon + redesign Chat Form Actions Add panel

* test: Update test reference

* fix: Icon

* fix: E2E test command

* fix: wait for greeting h1 to be visible in e2e test

* fix: remove duplicate PDF option in attachment dropdown

* fix: use label-based group toggle to avoid stale references

* refactor: inline MCP server and tool toggles in mobile sheet

* fix: serve correct build directory in e2e playwright config

* feat: add reasoning effort levels selector in model dropdown

* feat: Reasoning effort

* refactor: Make server origin configurable via environment variable

* feat: Add chat template thinking detector utility

* feat: Add thinking support detection to models store

* refactor: Update model selector components with thinking detection and message-specific indicators

* feat: Update chat form components for model selection and thinking support

* feat: Improve Reasoning controls UI

* refactor: Apply suggestions from code review

Co-authored-by: Aleksander Grygier <aleksander.grygier@gmail.com>

* fix: Model tags

* refactor: Cleanup

* refactor: Remove unneeded components

* refactor: Cleanup

common/arg.cpp

@@ -4077,7 +4077,6 @@ common_params_context common_params_parser_init(common_params & params, llama_ex
             params.sampling.top_k = 0;
             params.sampling.min_p = 0.01f;
             params.use_jinja = true;
-            //params.default_template_kwargs["reasoning_effort"] = "\"high\"";
         }
     ).set_examples({LLAMA_EXAMPLE_SERVER, LLAMA_EXAMPLE_CLI}));
 
@@ -4096,7 +4095,6 @@ common_params_context common_params_parser_init(common_params & params, llama_ex
             params.sampling.top_k = 0;
             params.sampling.min_p = 0.01f;
             params.use_jinja = true;
-            //params.default_template_kwargs["reasoning_effort"] = "\"high\"";
         }
     ).set_examples({LLAMA_EXAMPLE_SERVER, LLAMA_EXAMPLE_CLI}));
 

tools/ui/.env.example

@@ -1,2 +1,3 @@
 VITE_PUBLIC_APP_NAME='llama-ui'
-# VITE_DEBUG='true'
+VITE_DEBUG='true'
+VITE_PUBLIC_SERVER_ORIGIN='http://localhost:8033'

tools/ui/.prettierignore

@@ -7,6 +7,9 @@ bun.lockb
 
 # Miscellaneous
 /static/
+dist/
+.svelte-kit/
+build/
 
 # Build output
 /dist/

tools/ui/README.md

@@ -115,16 +115,18 @@ This starts:
 - **Vite dev server** at `http://localhost:5173` - The main UI frontend app
 - **Storybook** at `http://localhost:6006` - Component documentation
 
-The Vite dev server proxies API requests to `http://localhost:8080` (default llama-server port):
+The Vite dev server proxies API requests to `SERVER_ORIGIN` (with fallback to default llama-server `8080` port):
 
 ```typescript
 // vite.config.ts proxy configuration
 proxy: {
-  '/v1': 'http://localhost:8080',
+	'/v1': SERVER_ORIGIN,
-  '/props': 'http://localhost:8080',
+	'/props': SERVER_ORIGIN,
-  '/slots': 'http://localhost:8080',
+	'/models': SERVER_ORIGIN,
-  '/models': 'http://localhost:8080'
+	'/tools': SERVER_ORIGIN,
-}
+	'/slots': SERVER_ORIGIN,
+	'/cors-proxy': SERVER_ORIGIN
+},
 ```
 
 ### Development Workflow

tools/ui/playwright.config.ts

@@ -2,7 +2,7 @@ import { defineConfig } from '@playwright/test';
 
 export default defineConfig({
 	webServer: {
-		command: 'npm run build && http-server ../../build/tools/ui/dist -p 8181',
+		command: 'npm run build && npx http-server ./dist -p 8181',
 		port: 8181,
 		timeout: 120000,
 		reuseExistingServer: false

tools/ui/src/lib/components/app/chat/ChatForm/ChatForm.svelte

@@ -111,6 +111,7 @@
 	let preSelectedResourceUri = $state<string | undefined>(undefined);
 
 	let currentConfig = $derived(config());
+
 	let pasteLongTextToFileLength = $derived.by(() => {
 		const n = Number(currentConfig.pasteLongTextToFileLen);
 		return Number.isNaN(n) ? Number(SETTING_CONFIG_DEFAULT.pasteLongTextToFileLen) : n;

tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddDropdown.svelte

@@ -1,22 +1,18 @@
 <script lang="ts">
-	import { Plus } from '@lucide/svelte';
+	import { Plus, File, MessageSquare, Zap, FolderOpen } from '@lucide/svelte';
 	import * as DropdownMenu from '$lib/components/ui/dropdown-menu';
 	import * as Tooltip from '$lib/components/ui/tooltip';
 	import { buttonVariants } from '$lib/components/ui/button';
 	import { cn } from '$lib/components/ui/utils';
 	import {
 		ATTACHMENT_FILE_ITEMS,
-		ATTACHMENT_EXTRA_ITEMS,
-		ATTACHMENT_MCP_ITEMS,
 		ATTACHMENT_TOOLTIP_TEXT,
 		TOOLTIP_DELAY_DURATION
 	} from '$lib/constants';
-	import { AttachmentMenuItemId } from '$lib/enums';
 	import {
 		ChatFormActionAddToolsSubmenu,
 		ChatFormActionAddMcpServersSubmenu
 	} from '$lib/components/app';
-
 	import { useAttachmentMenu } from '$lib/hooks/use-attachment-menu.svelte';
 
 	interface Props {
@@ -97,6 +93,14 @@
 		</Tooltip.Root>
 
 		<DropdownMenu.Content align="start" class="w-48">
+			<DropdownMenu.Sub>
+				<DropdownMenu.SubTrigger class="flex cursor-pointer items-center gap-2">
+					<File class="h-4 w-4" />
+
+					<span>Add files</span>
+				</DropdownMenu.SubTrigger>
+
+				<DropdownMenu.SubContent class="w-48">
 					{#each ATTACHMENT_FILE_ITEMS as item (item.id)}
 						{@const enabled = attachmentMenu.isItemEnabled(item.enabledWhen)}
 						{#if enabled}
@@ -113,7 +117,10 @@
 								<Tooltip.Trigger tabindex={-1}>
 									{#snippet child({ props })}
 										<div {...props} class="cursor-default">
-									<DropdownMenu.Item class="{item.class ?? ''} flex items-center gap-2" disabled>
+											<DropdownMenu.Item
+												class="{item.class ?? ''} flex items-center gap-2"
+												disabled
+											>
 												<item.icon class="h-4 w-4" />
 
 												<span>{item.label}</span>
@@ -128,76 +135,45 @@
 							</Tooltip.Root>
 						{/if}
 					{/each}
+				</DropdownMenu.SubContent>
+			</DropdownMenu.Sub>
 
-			{#if !attachmentMenu.isItemEnabled('hasVisionModality')}
-				<Tooltip.Root delayDuration={TOOLTIP_DELAY_DURATION}>
-					<Tooltip.Trigger>
-						{#snippet child({ props })}
 			<DropdownMenu.Item
-								{...props}
 				class="flex cursor-pointer items-center gap-2"
-								onclick={attachmentMenu.callbacks.onFileUpload}
+				onclick={onSystemPromptClick}
 			>
-								{@const pdfItem = ATTACHMENT_FILE_ITEMS.find(
+				<MessageSquare class="h-4 w-4" />
-									(i) => i.id === AttachmentMenuItemId.PDF
-								)}
-								{#if pdfItem}
-									<pdfItem.icon class="h-4 w-4" />
 
-									<span>{pdfItem.label}</span>
+				<span>System Message</span>
-								{/if}
 			</DropdownMenu.Item>
-						{/snippet}
-					</Tooltip.Trigger>
-
-					<Tooltip.Content side="right">
-						<p>PDFs will be converted to text. Image-based PDFs may not work properly.</p>
-					</Tooltip.Content>
-				</Tooltip.Root>
-			{/if}
-
-			<DropdownMenu.Separator />
-
-			{#each ATTACHMENT_EXTRA_ITEMS as item (item.id)}
-				{#if item.id === AttachmentMenuItemId.SYSTEM_MESSAGE}
-					<Tooltip.Root delayDuration={TOOLTIP_DELAY_DURATION}>
-						<Tooltip.Trigger>
-							{#snippet child({ props })}
-								<DropdownMenu.Item
-									{...props}
-									class="flex cursor-pointer items-center gap-2"
-									onclick={() => attachmentMenu.callbacks[item.action]()}
-								>
-									<item.icon class="h-4 w-4" />
-
-									<span>{item.label}</span>
-								</DropdownMenu.Item>
-							{/snippet}
-						</Tooltip.Trigger>
-
-						<Tooltip.Content side="right">
-							<p>{attachmentMenu.getSystemMessageTooltip()}</p>
-						</Tooltip.Content>
-					</Tooltip.Root>
-				{/if}
-			{/each}
 
 			<ChatFormActionAddToolsSubmenu />
 
 			<ChatFormActionAddMcpServersSubmenu onMcpSettingsClick={handleMcpSettingsClick} />
 
-			{#each ATTACHMENT_MCP_ITEMS as item (item.id)}
+			{#if hasMcpPromptsSupport}
-				{#if attachmentMenu.isItemVisible(item.visibleWhen)}
+				<DropdownMenu.Separator />
+
 				<DropdownMenu.Item
 					class="flex cursor-pointer items-center gap-2"
-						onclick={() => attachmentMenu.callbacks[item.action]()}
+					onclick={onMcpPromptClick}
 				>
-						<item.icon class="h-4 w-4" />
+					<Zap class="h-4 w-4" />
 
-						<span>{item.label}</span>
+					<span>MCP Prompt</span>
+				</DropdownMenu.Item>
+			{/if}
+
+			{#if hasMcpResourcesSupport}
+				<DropdownMenu.Item
+					class="flex cursor-pointer items-center gap-2"
+					onclick={onMcpResourcesClick}
+				>
+					<FolderOpen class="h-4 w-4" />
+
+					<span>MCP Resources</span>
 				</DropdownMenu.Item>
 			{/if}
-			{/each}
 		</DropdownMenu.Content>
 	</DropdownMenu.Root>
 </div>

tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddSheet.svelte

@@ -2,18 +2,19 @@
 	import type { Snippet } from 'svelte';
 	import * as Tooltip from '$lib/components/ui/tooltip';
 	import * as Sheet from '$lib/components/ui/sheet';
+	import * as Collapsible from '$lib/components/ui/collapsible';
+	import { File, MessageSquare, Zap, FolderOpen } from '@lucide/svelte';
+	import { Switch } from '$lib/components/ui/switch';
+	import { Checkbox } from '$lib/components/ui/checkbox';
 	import { TOOLTIP_DELAY_DURATION } from '$lib/constants';
-	import {
+	import { ATTACHMENT_FILE_ITEMS } from '$lib/constants/attachment-menu';
-		ATTACHMENT_FILE_ITEMS,
-		ATTACHMENT_EXTRA_ITEMS,
-		ATTACHMENT_MCP_ITEMS
-	} from '$lib/constants/attachment-menu';
-	import { McpLogo } from '$lib/components/app';
 	import { useAttachmentMenu } from '$lib/hooks/use-attachment-menu.svelte';
-	import { AttachmentMenuItemId } from '$lib/enums';
+	import { useToolsPanel } from '$lib/hooks/use-tools-panel.svelte';
-	import { PencilRuler } from '@lucide/svelte';
+	import { conversationsStore } from '$lib/stores/conversations.svelte';
-	import { ROUTES, SETTINGS_SECTION_SLUGS } from '$lib/constants/routes';
+	import { mcpStore } from '$lib/stores/mcp.svelte';
-	import { RouterService } from '$lib/services/router.service';
+	import { McpLogo } from '$lib/components/app';
+	import { PencilRuler, ChevronDown, ChevronRight } from '@lucide/svelte';
+	import { HealthCheckStatus } from '$lib/enums';
 
 	interface Props {
 		class?: string;
@@ -46,6 +47,9 @@
 	}: Props = $props();
 
 	let sheetOpen = $state(false);
+	let filesExpanded = $state(true);
+	let toolsExpanded = $state(false);
+	let mcpExpanded = $state(false);
 
 	const attachmentMenu = useAttachmentMenu(
 		() => ({
@@ -61,14 +65,22 @@
 		}
 	);
 
+	const toolsPanel = useToolsPanel();
+
 	const sheetItemClass =
 		'flex w-full items-center gap-3 rounded-md px-3 py-2.5 text-left text-sm transition-colors hover:bg-accent active:bg-accent disabled:cursor-not-allowed disabled:opacity-50';
+
+	const sheetItemRowClass =
+		'flex w-full items-center justify-between gap-2 rounded-md px-3 py-2 text-left text-sm transition-colors hover:bg-accent';
+
+	function getEnabledMcpServers() {
+		return mcpStore.getServersSorted().filter((s) => s.enabled);
+	}
 </script>
 
 <div class="flex items-center gap-1 {className}">
 	<Sheet.Root bind:open={sheetOpen}>
 		{@render trigger({ disabled, onclick: () => (sheetOpen = true) })}
-		<!-- <ChatFormActionAddButton {disabled} onclick={() => (sheetOpen = true)} /> -->
 
 		<Sheet.Content side="bottom" class="max-h-[85vh] gap-0 overflow-y-auto">
 			<Sheet.Header>
@@ -80,6 +92,21 @@
 			</Sheet.Header>
 
 			<div class="flex flex-col gap-1 px-1.5 pb-2">
+				<Collapsible.Root open={filesExpanded} onOpenChange={(open) => (filesExpanded = open)}>
+					<Collapsible.Trigger class={sheetItemClass}>
+						{#if filesExpanded}
+							<ChevronDown class="h-4 w-4 shrink-0" />
+						{:else}
+							<ChevronRight class="h-4 w-4 shrink-0" />
+						{/if}
+
+						<File class="h-4 w-4 shrink-0" />
+
+						<span class="flex-1">Add files</span>
+					</Collapsible.Trigger>
+
+					<Collapsible.Content>
+						<div class="flex flex-col gap-0.5 pl-4">
 							{#each ATTACHMENT_FILE_ITEMS as item (item.id)}
 								{@const enabled = attachmentMenu.isItemEnabled(item.enabledWhen)}
 								{#if enabled}
@@ -108,82 +135,163 @@
 									</Tooltip.Root>
 								{/if}
 							{/each}
+						</div>
+					</Collapsible.Content>
+				</Collapsible.Root>
+
+				<Collapsible.Root open={mcpExpanded} onOpenChange={(open) => (mcpExpanded = open)}>
+					<Collapsible.Trigger class={sheetItemClass}>
+						{#if mcpExpanded}
+							<ChevronDown class="h-4 w-4 shrink-0" />
+						{:else}
+							<ChevronRight class="h-4 w-4 shrink-0" />
+						{/if}
+
+						<McpLogo class="inline h-4 w-4 shrink-0" />
+
+						<span class="flex-1">MCP Servers</span>
+
+						<span class="text-xs text-muted-foreground">
+							{getEnabledMcpServers().length} server{getEnabledMcpServers().length !== 1 ? 's' : ''}
+						</span>
+					</Collapsible.Trigger>
+
+					<Collapsible.Content>
+						<div class="flex flex-col gap-0.5 pl-4">
+							{#each getEnabledMcpServers() as server (server.id)}
+								{@const healthState = mcpStore.getHealthCheckState(server.id)}
+								{@const hasError = healthState.status === HealthCheckStatus.ERROR}
+								{@const displayName = mcpStore.getServerLabel(server)}
+								{@const faviconUrl = mcpStore.getServerFavicon(server.id)}
+								{@const isEnabled = conversationsStore.isMcpServerEnabledForChat(server.id)}
 
-				{#if !attachmentMenu.isItemEnabled('hasVisionModality')}
-					{@const pdfItem = ATTACHMENT_FILE_ITEMS.find((i) => i.id === AttachmentMenuItemId.PDF)}
-					{#if pdfItem}
-						<Tooltip.Root delayDuration={TOOLTIP_DELAY_DURATION}>
-							<Tooltip.Trigger>
 								<button
 									type="button"
-									class={sheetItemClass}
+									class={sheetItemRowClass}
-									onclick={() => attachmentMenu.callbacks[pdfItem.action]()}
+									onclick={() => !hasError && conversationsStore.toggleMcpServerForChat(server.id)}
+									disabled={hasError}
 								>
-									<pdfItem.icon class="h-4 w-4 shrink-0" />
+									<div class="flex min-w-0 flex-1 items-center gap-2">
-
+										{#if faviconUrl}
-									<span>{pdfItem.label}</span>
+											<img
-								</button>
+												src={faviconUrl}
-							</Tooltip.Trigger>
+												alt=""
-
+												class="h-4 w-4 shrink-0 rounded-sm"
-							<Tooltip.Content side="right">
+												onerror={(e) => {
-								<p>PDFs will be converted to text. Image-based PDFs may not work properly.</p>
+													(e.currentTarget as HTMLImageElement).style.display = 'none';
-							</Tooltip.Content>
+												}}
-						</Tooltip.Root>
+											/>
-					{/if}
 										{/if}
 
-				{#each ATTACHMENT_EXTRA_ITEMS as item (item.id)}
+										<span class="min-w-0 truncate text-sm">{displayName}</span>
-					{#if item.id === AttachmentMenuItemId.SYSTEM_MESSAGE}
+									</div>
-						<Tooltip.Root delayDuration={TOOLTIP_DELAY_DURATION}>
+
-							<Tooltip.Trigger>
+									{#if hasError}
-								<button
+										<span
-									type="button"
+											class="shrink-0 rounded bg-destructive/15 px-1.5 py-0.5 text-xs text-destructive"
-									class={sheetItemClass}
-									onclick={() => attachmentMenu.callbacks[item.action]()}
 										>
-									<item.icon class="h-4 w-4 shrink-0" />
+											Error
-
+										</span>
-									<span>{item.label}</span>
+									{:else}
-								</button>
+										<Switch
-							</Tooltip.Trigger>
+											checked={isEnabled}
-
+											onCheckedChange={() => conversationsStore.toggleMcpServerForChat(server.id)}
-							<Tooltip.Content side="right">
+										/>
-								<p>{attachmentMenu.getSystemMessageTooltip()}</p>
-							</Tooltip.Content>
-						</Tooltip.Root>
 									{/if}
+								</button>
 							{/each}
 
-				<div class="my-2 border-t"></div>
+							{#if getEnabledMcpServers().length === 0}
+								<div class="px-3 py-2 text-center text-sm text-muted-foreground">
+									No MCP servers configured
+								</div>
+							{/if}
+						</div>
+					</Collapsible.Content>
+				</Collapsible.Root>
 
-				<a href={ROUTES.MCP_SERVERS} class="flex items-center gap-3 px-3 py-2">
+				{#if toolsPanel.totalToolCount > 0}
-					<McpLogo class="inline h-4 w-4" />
+					<Collapsible.Root open={toolsExpanded} onOpenChange={(open) => (toolsExpanded = open)}>
+						<Collapsible.Trigger class={sheetItemClass}>
+							{#if toolsExpanded}
+								<ChevronDown class="h-4 w-4 shrink-0" />
+							{:else}
+								<ChevronRight class="h-4 w-4 shrink-0" />
+							{/if}
 
-					<span class="text-sm">MCP Servers</span>
+							<PencilRuler class="inline h-4 w-4 shrink-0" />
-				</a>
 
-				<a
+							<span class="flex-1">Tools</span>
-					href={RouterService.settings(SETTINGS_SECTION_SLUGS.TOOLS)}
-					class="flex items-center gap-3 px-3 py-2"
-				>
-					<PencilRuler class="inline h-4 w-4" />
 
-					<span class="text-sm">Tools</span>
+							<span class="text-xs text-muted-foreground">
-				</a>
+								{toolsPanel.totalToolCount} tool{toolsPanel.totalToolCount !== 1 ? 's' : ''}
+							</span>
+						</Collapsible.Trigger>
+
+						<Collapsible.Content>
+							<div class="flex flex-col gap-0.5 pl-4">
+								{#each toolsPanel.activeGroups as group (group.label)}
+									{@const { checked, indeterminate } = toolsPanel.getGroupCheckedState(group)}
+									{@const enabledCount = toolsPanel.getEnabledToolCount(group)}
+									{@const favicon = toolsPanel.getFavicon(group)}
 
-				{#each ATTACHMENT_MCP_ITEMS as item (item.id)}
-					{#if attachmentMenu.isItemVisible(item.visibleWhen)}
 									<button
 										type="button"
-							class={sheetItemClass}
+										class={sheetItemRowClass}
-							onclick={() => attachmentMenu.callbacks[item.action]()}
+										onclick={() => toolsPanel.toggleGroupByLabel(group.label)}
 									>
-							<item.icon class="h-4 w-4 shrink-0" />
+										{#if favicon}
+											<img
+												src={favicon}
+												alt=""
+												class="h-4 w-4 shrink-0 rounded-sm"
+												onerror={(e) => {
+													(e.currentTarget as HTMLImageElement).style.display = 'none';
+												}}
+											/>
+										{/if}
 
-							<span>{item.label}</span>
+										<span class="min-w-0 flex-1 truncate text-sm font-medium">{group.label}</span>
+
+										<span class="shrink-0 text-xs text-muted-foreground">
+											{enabledCount}/{group.tools.length}
+										</span>
+
+										<Checkbox
+											{checked}
+											{indeterminate}
+											class="h-4 w-4 shrink-0"
+											onclick={(e) => e.stopPropagation()}
+											onCheckedChange={() => toolsPanel.toggleGroupByLabel(group.label)}
+										/>
+									</button>
+								{/each}
+							</div>
+						</Collapsible.Content>
+					</Collapsible.Root>
+				{/if}
+
+				<button type="button" class={sheetItemClass} onclick={onSystemPromptClick}>
+					<MessageSquare class="h-4 w-4 shrink-0" />
+
+					<span>System Message</span>
+				</button>
+
+				{#if hasMcpPromptsSupport}
+					<button type="button" class={sheetItemClass} onclick={onMcpPromptClick}>
+						<Zap class="h-4 w-4 shrink-0" />
+
+						<span>MCP Prompt</span>
+					</button>
+				{/if}
+
+				{#if hasMcpResourcesSupport}
+					<button type="button" class={sheetItemClass} onclick={onMcpResourcesClick}>
+						<FolderOpen class="h-4 w-4 shrink-0" />
+
+						<span>MCP Resources</span>
 					</button>
 				{/if}
-				{/each}
 			</div>
 		</Sheet.Content>
 	</Sheet.Root>

tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddToolsSubmenu.svelte

@@ -107,7 +107,7 @@
 									<Checkbox
 										{checked}
 										{indeterminate}
-										onCheckedChange={() => toolsStore.toggleGroup(group)}
+										onCheckedChange={() => toolsPanel.toggleGroupByLabel(group.label)}
 										class="mr-2 h-4 w-4 shrink-0"
 									/>
 								</Tooltip.Trigger>

tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActionModels.svelte

@@ -1,6 +1,11 @@
 <script lang="ts">
 	import { chatStore } from '$lib/stores/chat.svelte';
-	import { modelsStore, modelOptions, selectedModelId } from '$lib/stores/models.svelte';
+	import {
+		modelsStore,
+		modelOptions,
+		selectedModelId,
+		selectedModelName
+	} from '$lib/stores/models.svelte';
 	import { isRouterMode, serverError } from '$lib/stores/server.svelte';
 	import { ModelsSelectorDropdown, ModelsSelectorSheet } from '$lib/components/app';
 	import { isMobile } from '$lib/stores/viewport.svelte';
@@ -39,7 +44,18 @@
 
 	let lastSyncedConversationModel: string | null = null;
 
-	let selectorModel = $derived(conversationModel ?? modelsStore.selectedModelName ?? null);
+	let selectorModel = $derived.by(() => {
+		const storeModel = selectedModelName();
+		if (storeModel && storeModel !== conversationModel) {
+			return storeModel;
+		}
+
+		if (conversationModel) {
+			return conversationModel;
+		}
+
+		return null;
+	});
 
 	$effect(() => {
 		if (conversationModel && conversationModel !== lastSyncedConversationModel) {
@@ -50,7 +66,6 @@
 				modelsStore.selectedModelName = null;
 				modelsStore.clearSelection();
 			}
-
 			lastSyncedConversationModel = conversationModel;
 		} else if (
 			isRouter &&
@@ -60,9 +75,7 @@
 			!conversationModel
 		) {
 			lastSyncedConversationModel = null;
-
 			const first = modelOptions().find((m) => modelsStore.loadedModelIds.includes(m.model));
-
 			if (first) modelsStore.selectModelById(first.id);
 		}
 	});

tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormActions.svelte

@@ -6,7 +6,8 @@
 		ChatFormActionsAdd,
 		ChatFormActionModels,
 		ChatFormActionRecord,
-		ChatFormActionSubmit
+		ChatFormActionSubmit,
+		ChatFormReasoningToggle
 	} from '$lib/components/app';
 	import { FileTypeCategory } from '$lib/enums';
 	import { mcpStore } from '$lib/stores/mcp.svelte';
@@ -99,7 +100,7 @@
 	style="container-type: inline-size"
 >
 	{#if showAddButton}
-		<div class="mr-auto flex items-center gap-2">
+		<div class="mr-auto flex items-center gap-3">
 			<ChatFormActionsAdd
 				{disabled}
 				{hasAudioModality}
@@ -116,6 +117,9 @@
 		</div>
 	{/if}
 
+	<div class="flex items-center gap-2">
+		<ChatFormReasoningToggle />
+
 		{#if showModelSelector}
 			<ChatFormActionModels
 				{disabled}
@@ -130,6 +134,7 @@
 				useGlobalSelection
 			/>
 		{/if}
+	</div>
 
 	{#if isReasoning}
 		<Button

tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormReasoningEffortSubmenu.svelte

@@ -0,0 +1,132 @@
+<script lang="ts">
+	import { Check, Info, Lightbulb, LightbulbOff } from '@lucide/svelte';
+	import * as DropdownMenu from '$lib/components/ui/dropdown-menu';
+	import * as Tooltip from '$lib/components/ui/tooltip';
+	import { ReasoningEffort, MessageRole } from '$lib/enums';
+	import { REASONING_EFFORT_TOKENS } from '$lib/constants/reasoning-effort-tokens';
+	import { REASONING_EFFORT_LEVELS } from '$lib/constants/reasoning-effort';
+	import type { ReasoningEffortLevel } from '$lib/types';
+	import {
+		modelsStore,
+		checkModelSupportsThinking,
+		supportsThinking,
+		propsCacheVersion,
+		loadedModelIds
+	} from '$lib/stores/models.svelte';
+	import { chatStore } from '$lib/stores/chat.svelte';
+	import { conversationsStore, activeMessages } from '$lib/stores/conversations.svelte';
+	import { isRouterMode } from '$lib/stores/server.svelte';
+	import type { DatabaseMessage } from '$lib/types/database';
+
+	let thinkingEnabled = $derived(conversationsStore.getThinkingEnabled());
+	let currentEffort = $derived(conversationsStore.getReasoningEffort());
+	let isOff = $derived(!thinkingEnabled);
+	let subOpen = $state(false);
+
+	// Get conversation model from message history
+	let conversationModel = $derived(
+		chatStore.getConversationModel(activeMessages() as DatabaseMessage[])
+	);
+
+	let modelSupportsThinkingFromMessages = $derived.by(() => {
+		const modelId = isRouterMode() ? modelsStore.selectedModelName || conversationModel : null;
+		if (!modelId) return false;
+
+		const messages = conversationsStore.activeMessages;
+
+		return messages.some(
+			(m: DatabaseMessage) =>
+				m.role === MessageRole.ASSISTANT && m.model === modelId && !!m.reasoningContent
+		);
+	});
+
+	let modelSupportsThinking = $derived.by(() => {
+		loadedModelIds();
+		propsCacheVersion();
+
+		if (isRouterMode()) {
+			const modelId = modelsStore.selectedModelName || conversationModel;
+			return checkModelSupportsThinking(modelId ?? '') || modelSupportsThinkingFromMessages;
+		}
+
+		return supportsThinking() || modelSupportsThinkingFromMessages;
+	});
+
+	function isSelected(item: ReasoningEffortLevel): boolean {
+		if (item.isOff) return isOff;
+
+		return thinkingEnabled && currentEffort === item.value;
+	}
+
+	function handleSelection(item: ReasoningEffortLevel) {
+		if (item.isOff) {
+			conversationsStore.setThinkingEnabled(false);
+		} else {
+			conversationsStore.setThinkingEnabled(true);
+			conversationsStore.setReasoningEffort(item.value as ReasoningEffort);
+		}
+		subOpen = false;
+	}
+</script>
+
+{#if modelSupportsThinking}
+	<DropdownMenu.Sub bind:open={subOpen}>
+		<DropdownMenu.SubTrigger
+			class="flex cursor-pointer items-center gap-2 rounded-md px-2.5 py-1.5 text-sm transition-colors outline-none hover:bg-accent focus:bg-accent"
+		>
+			{#if thinkingEnabled}
+				<Lightbulb class="h-4 w-4 shrink-0 text-amber-400" />
+			{:else}
+				<LightbulbOff class="h-4 w-4 shrink-0 text-muted-foreground" />
+			{/if}
+
+			<span class="flex-1">Thinking</span>
+
+			{#if thinkingEnabled}
+				<span class="text-xs text-muted-foreground">{currentEffort}</span>
+			{:else}
+				<span class="text-xs text-muted-foreground">off</span>
+			{/if}
+		</DropdownMenu.SubTrigger>
+
+		<DropdownMenu.SubContent
+			class="w-60 rounded-xl bg-popover p-3 text-popover-foreground shadow-md outline-none data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95"
+		>
+			{#each REASONING_EFFORT_LEVELS as level (level.value)}
+				<button
+					type="button"
+					class="flex w-full cursor-pointer items-center gap-2 rounded-lg px-2.5 py-2 text-left text-sm transition-colors hover:bg-accent"
+					class:bg-accent={isSelected(level)}
+					onclick={() => handleSelection(level)}
+				>
+					{#if isSelected(level)}
+						<Check class="h-4 w-4 shrink-0 text-foreground" />
+					{:else}
+						<div class="h-4 w-4 shrink-0"></div>
+					{/if}
+
+					<span class="flex-1">{level.label}</span>
+
+					{#if !level.isOff}
+						<span class="text-[11px] text-muted-foreground opacity-60">
+							{REASONING_EFFORT_TOKENS[level.value] === -1
+								? 'Unlimited'
+								: `Max ${REASONING_EFFORT_TOKENS[level.value].toLocaleString()} tokens`}
+						</span>
+					{/if}
+
+					{#if level.hasInfo}
+						<Tooltip.Root>
+							<Tooltip.Trigger>
+								<Info class="h-3.5 w-3.5 shrink-0 text-muted-foreground" />
+							</Tooltip.Trigger>
+							<Tooltip.Content side="left">
+								<p>Maximum thinking effort with extended context usage</p>
+							</Tooltip.Content>
+						</Tooltip.Root>
+					{/if}
+				</button>
+			{/each}
+		</DropdownMenu.SubContent>
+	</DropdownMenu.Sub>
+{/if}

tools/ui/src/lib/components/app/chat/ChatForm/ChatFormActions/ChatFormReasoningToggle.svelte

@@ -0,0 +1,145 @@
+<script lang="ts">
+	import { Lightbulb, LightbulbOff, Check, Info } from '@lucide/svelte';
+	import * as DropdownMenu from '$lib/components/ui/dropdown-menu';
+	import * as Tooltip from '$lib/components/ui/tooltip';
+	import { ReasoningEffort, MessageRole } from '$lib/enums';
+	import { REASONING_EFFORT_TOKENS } from '$lib/constants/reasoning-effort-tokens';
+	import { REASONING_EFFORT_LEVELS } from '$lib/constants/reasoning-effort';
+	import type { ReasoningEffortLevel } from '$lib/types';
+	import {
+		modelsStore,
+		checkModelSupportsThinking,
+		supportsThinking,
+		propsCacheVersion,
+		loadedModelIds
+	} from '$lib/stores/models.svelte';
+	import { chatStore } from '$lib/stores/chat.svelte';
+	import { conversationsStore, activeMessages } from '$lib/stores/conversations.svelte';
+	import { isRouterMode } from '$lib/stores/server.svelte';
+	import type { DatabaseMessage } from '$lib/types/database';
+
+	let thinkingEnabled = $derived(conversationsStore.getThinkingEnabled());
+	let currentEffort = $derived(conversationsStore.getReasoningEffort());
+	let isOff = $derived(!thinkingEnabled);
+	let tooltipText = $derived(thinkingEnabled ? `${currentEffort} Reasoning` : 'Disabled Reasoning');
+	let subOpen = $state(false);
+
+	// Get conversation model from message history
+	let conversationModel = $derived(
+		chatStore.getConversationModel(activeMessages() as DatabaseMessage[])
+	);
+
+	// Fallback: if model props aren't available, check if any assistant messages
+	// for this model in the active conversation have reasoning content.
+	let modelSupportsThinkingFromMessages = $derived.by(() => {
+		const modelId = isRouterMode() ? modelsStore.selectedModelName || conversationModel : null;
+		if (!modelId) return false;
+		const messages = conversationsStore.activeMessages;
+		return messages.some(
+			(m: DatabaseMessage) =>
+				m.role === MessageRole.ASSISTANT && m.model === modelId && !!m.reasoningContent
+		);
+	});
+
+	// Check if model supports thinking. Primary: chat template from /props.
+	// Fallback: message history (reasoning content in assistant messages).
+	let modelSupportsThinking = $derived.by(() => {
+		loadedModelIds();
+		propsCacheVersion();
+
+		if (isRouterMode()) {
+			const modelId = modelsStore.selectedModelName || conversationModel;
+			return checkModelSupportsThinking(modelId ?? '') || modelSupportsThinkingFromMessages;
+		}
+
+		// In non-router mode, use the built-in supportsThinking
+		return supportsThinking() || modelSupportsThinkingFromMessages;
+	});
+
+	// Check if current item is selected
+	function isSelected(item: ReasoningEffortLevel): boolean {
+		if (item.isOff) {
+			return isOff;
+		}
+		return thinkingEnabled && currentEffort === item.value;
+	}
+
+	function handleSelection(item: ReasoningEffortLevel) {
+		if (item.isOff) {
+			conversationsStore.setThinkingEnabled(false);
+		} else {
+			conversationsStore.setThinkingEnabled(true);
+			conversationsStore.setReasoningEffort(item.value as ReasoningEffort);
+		}
+		subOpen = false;
+	}
+</script>
+
+{#if modelSupportsThinking}
+	<DropdownMenu.Root bind:open={subOpen}>
+		<Tooltip.Root>
+			<Tooltip.Trigger>
+				<DropdownMenu.Trigger
+					class={[
+						'flex h-6 w-6 cursor-pointer items-center justify-center rounded-full p-0 transition-colors focus:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2',
+						thinkingEnabled ? 'bg-amber-400/10 hover:bg-amber-400/20' : 'bg-muted'
+					]}
+					aria-label={`${tooltipText}. Click to configure.`}
+				>
+					{#if thinkingEnabled}
+						<Lightbulb class="h-3 w-3 text-amber-400" />
+					{:else}
+						<LightbulbOff class="h-3 w-3 text-muted-foreground" />
+					{/if}
+				</DropdownMenu.Trigger>
+			</Tooltip.Trigger>
+
+			<Tooltip.Content>
+				<p class="capitalize">{tooltipText}</p>
+			</Tooltip.Content>
+		</Tooltip.Root>
+
+		<DropdownMenu.Content
+			align="start"
+			class="w-60 rounded-xl bg-popover p-3 text-popover-foreground shadow-md outline-none"
+		>
+			<div class="mb-2 px-2.5 text-sm font-medium">Reasoning effort</div>
+
+			{#each REASONING_EFFORT_LEVELS as level (level.value)}
+				<button
+					type="button"
+					class="flex w-full cursor-pointer items-center gap-2 rounded-lg px-2.5 py-2 text-left text-sm transition-colors hover:bg-accent"
+					class:bg-accent={isSelected(level)}
+					onclick={() => handleSelection(level)}
+				>
+					{#if isSelected(level)}
+						<Check class="h-4 w-4 shrink-0 text-foreground" />
+					{:else}
+						<div class="h-4 w-4 shrink-0"></div>
+					{/if}
+
+					<span class="flex-1">{level.label}</span>
+
+					{#if !level.isOff}
+						<span class="text-[11px] text-muted-foreground opacity-60">
+							{REASONING_EFFORT_TOKENS[level.value] === -1
+								? 'Unlimited'
+								: `Max ${REASONING_EFFORT_TOKENS[level.value].toLocaleString()} tokens`}
+						</span>
+					{/if}
+
+					{#if level.hasInfo}
+						<Tooltip.Root>
+							<Tooltip.Trigger>
+								<Info class="h-3.5 w-3.5 shrink-0 text-muted-foreground" />
+							</Tooltip.Trigger>
+							<Tooltip.Content side="left">
+								<p>Maximum reasoning effort with extended context usage</p>
+							</Tooltip.Content>
+						</Tooltip.Root>
+					{/if}
+				</button>
+			{/each}
+		</DropdownMenu.Content>
+	</DropdownMenu.Root>
+{/if}

tools/ui/src/lib/components/app/chat/index.ts

@@ -240,6 +240,15 @@ export { default as ChatFormActionAddToolsSubmenu } from './ChatForm/ChatFormAct
  */
 export { default as ChatFormActionAddMcpServersSubmenu } from './ChatForm/ChatFormActions/ChatFormActionAdd/ChatFormActionAddMcpServersSubmenu.svelte';
 
+/**
+ * **ChatFormReasoningToggle** - Thinking toggle button with effort dropdown
+ *
+ * A toggle button with lightbulb icon that indicates thinking status.
+ * Shows the reasoning effort dropdown when clicked.
+ * Only visible when the current model supports thinking.
+ */
+export { default as ChatFormReasoningToggle } from './ChatForm/ChatFormActions/ChatFormReasoningToggle.svelte';
+
 /**
  * Hidden file input element for programmatic file selection.
  */

tools/ui/src/lib/components/app/models/ModelId.svelte

@@ -8,6 +8,7 @@
 		hideOrgName?: boolean;
 		showRaw?: boolean;
 		hideQuantization?: boolean;
+		hideTags?: boolean;
 		aliases?: string[];
 		tags?: string[];
 		class?: string;
@@ -17,7 +18,8 @@
 		modelId,
 		hideOrgName = false,
 		showRaw = undefined,
-		hideQuantization = false,
+		hideQuantization,
+		hideTags,
 		aliases,
 		tags,
 		class: className = '',
@@ -31,6 +33,8 @@
 
 	let parsed = $derived(ModelsService.parseModelId(modelId));
 	let resolvedShowRaw = $derived(showRaw ?? (config().showRawModelNames as boolean) ?? false);
+	let resolvedHideQuantization = $derived(hideQuantization ?? !config().showModelQuantization);
+	let resolvedHideTags = $derived(hideTags ?? !config().showModelTags);
 
 	let uniqueAliases = $derived([...new Set(aliases ?? [])]);
 	let uniqueTags = $derived([...new Set([...(parsed.tags ?? []), ...(tags ?? [])])]);
@@ -53,7 +57,7 @@
 			</span>
 		{/if}
 
-		{#if parsed.quantization && !hideQuantization}
+		{#if parsed.quantization && !resolvedHideQuantization}
 			<span class={badgeClass}>
 				{parsed.quantization}
 			</span>
@@ -69,7 +73,7 @@
 			{/each}
 		{/if}
 
-		{#if uniqueTags.length > 0}
+		{#if uniqueTags.length > 0 && !resolvedHideTags}
 			{#each uniqueTags as tag (tag)}
 				<span class={tagBadgeClass}>{tag}</span>
 			{/each}

tools/ui/src/lib/components/app/models/ModelsSelectorDropdown.svelte

@@ -106,9 +106,7 @@
 				]}
 				style="max-width: min(calc(100cqw - 10rem), 20rem)"
 			>
-				<Package class="h-3.5 w-3.5" />
+				<Package class="h-3.5 w-3.5 shrink-0" />
-
-				<ModelId modelId={currentModel} class="min-w-0" hideQuantization />
 			</span>
 		{:else}
 			<p class="text-xs text-muted-foreground">No models available.</p>
@@ -120,7 +118,7 @@
 			<DropdownMenu.Root bind:open={isOpen} onOpenChange={ms.handleOpenChange}>
 				<DropdownMenu.Trigger
 					class={[
-						`inline-grid cursor-pointer grid-cols-[1fr_auto_1fr] items-center gap-1.5 rounded-sm bg-background px-1.5 py-1 text-xs shadow-sm transition hover:bg-muted-foreground/20 focus:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-60 dark:bg-muted-foreground/15 dark:text-secondary-foreground`,
+						`inline-flex cursor-pointer items-center gap-1.5 rounded-sm bg-background px-1.5 py-1 text-xs shadow-sm transition hover:bg-muted-foreground/20 focus:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-60 dark:bg-muted-foreground/15 dark:text-secondary-foreground`,
 						!ms.isCurrentModelInCache
 							? 'bg-red-400/10 !text-red-400 hover:bg-red-400/20 hover:text-red-400'
 							: forceForegroundText
@@ -133,7 +131,7 @@
 					]}
 					disabled={disabled || ms.updating}
 				>
-					<Package class="h-3.5 w-3.5" />
+					<Package class="h-3.5 w-3.5 shrink-0" />
 
 					{#if selectedOption}
 						<Tooltip.Root>
@@ -144,6 +142,7 @@
 										modelId={selectedOption.model}
 										class="min-w-0 overflow-hidden"
 										hideOrgName={false}
+										hideQuantization
 										{...props}
 									/>
 								{/snippet}
@@ -158,9 +157,9 @@
 					{/if}
 
 					{#if ms.updating || ms.isLoadingModel}
-						<Loader2 class="h-3 w-3.5 animate-spin" />
+						<Loader2 class="h-3 w-3.5 shrink-0 animate-spin" />
 					{:else}
-						<ChevronDown class="h-3 w-3.5" />
+						<ChevronDown class="h-3 w-3.5 shrink-0" />
 					{/if}
 				</DropdownMenu.Trigger>
 
@@ -251,7 +250,7 @@
 				onclick={() => ms.handleOpenChange(true)}
 				disabled={disabled || ms.updating}
 			>
-				<Package class="h-3.5 w-3.5" />
+				<Package class="h-3.5 w-3.5 shrink-0" />
 
 				{#if selectedOption}
 					<Tooltip.Root>
@@ -262,6 +261,7 @@
 									modelId={selectedOption.model}
 									class="min-w-0 overflow-hidden"
 									hideOrgName={false}
+									hideQuantization
 									{...props}
 								/>
 							{/snippet}
@@ -274,7 +274,7 @@
 				{/if}
 
 				{#if ms.updating}
-					<Loader2 class="h-3 w-3.5 animate-spin" />
+					<Loader2 class="h-3 w-3.5 shrink-0 animate-spin" />
 				{/if}
 			</button>
 		{/if}

tools/ui/src/lib/components/app/models/ModelsSelectorSheet.svelte

@@ -6,8 +6,7 @@
 		DialogModelInformation,
 		ModelId,
 		ModelsSelectorList,
-		SearchInput,
+		SearchInput
-		TruncatedText
 	} from '$lib/components/app';
 
 	interface Props {
@@ -67,7 +66,7 @@
 			<button
 				type="button"
 				class={[
-					`inline-grid cursor-pointer grid-cols-[1fr_auto_1fr] items-center gap-1.5 rounded-sm bg-background px-1.5 py-1 text-xs shadow-sm transition hover:bg-muted-foreground/20 focus:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-60 dark:bg-muted-foreground/15 dark:text-secondary-foreground`,
+					`inline-flex cursor-pointer items-center gap-1.5 rounded-sm bg-background px-1.5 py-1 text-xs shadow-sm transition hover:bg-muted-foreground/20 focus:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-60 dark:bg-muted-foreground/15 dark:text-secondary-foreground`,
 					!ms.isCurrentModelInCache
 						? 'bg-red-400/10 !text-red-400 hover:bg-red-400/20 hover:text-red-400'
 						: forceForegroundText
@@ -81,7 +80,7 @@
 				disabled={disabled || ms.updating}
 				onclick={() => ms.handleOpenChange(true)}
 			>
-				<Package class="h-3.5 w-3.5" />
+				<Package class="h-3.5 w-3.5 shrink-0" />
 
 				{#if !selectedOption}
 					<span class="min-w-0 font-medium">Select model</span>
@@ -90,14 +89,15 @@
 						class="text-xs"
 						modelId={selectedOption?.model || ''}
 						hideQuantization
+						hideTags
 						hideOrgName
 					/>
 				{/if}
 
 				{#if ms.updating || ms.isLoadingModel}
-					<Loader2 class="h-3 w-3.5 animate-spin" />
+					<Loader2 class="h-3 w-3.5 shrink-0 animate-spin" />
 				{:else}
-					<ChevronDown class="h-3 w-3.5" />
+					<ChevronDown class="h-3 w-3.5 shrink-0" />
 				{/if}
 			</button>
 
@@ -168,12 +168,12 @@
 				onclick={() => ms.handleOpenChange(true)}
 				disabled={disabled || ms.updating}
 			>
-				<Package class="h-3.5 w-3.5" />
+				<Package class="h-3.5 w-3.5 shrink-0" />
 
-				<TruncatedText text={selectedOption?.model || ''} class="font-medium" />
+				<ModelId modelId={selectedOption?.model || ''} class="font-medium" hideQuantization />
 
 				{#if ms.updating}
-					<Loader2 class="h-3 w-3.5 animate-spin" />
+					<Loader2 class="h-3 w-3.5 shrink-0 animate-spin" />
 				{/if}
 			</button>
 		{/if}

tools/ui/src/lib/components/app/models/index.ts

@@ -74,8 +74,7 @@ export { default as ModelsSelectorOption } from './ModelsSelectorOption.svelte';
  */
 export { default as ModelsSelectorSheet } from './ModelsSelectorSheet.svelte';
 
-/**
+/** * **ModelBadge** - Model name display badge
- * **ModelBadge** - Model name display badge
  *
  * Compact badge showing current model name with package icon.
  * Only visible in single model mode. Supports tooltip and copy functionality.

tools/ui/src/lib/constants/attachment-menu.ts

@@ -79,7 +79,9 @@ export const ATTACHMENT_FILE_ITEMS: AttachmentMenuItem[] = [
 	}
 ];
 
-export const ATTACHMENT_EXTRA_ITEMS: AttachmentMenuItem[] = [
+export const ATTACHMENT_EXTRA_ITEMS: AttachmentMenuItem[] = [];
+
+export const ATTACHMENT_PROMPT_ITEMS: AttachmentMenuItem[] = [
 	{
 		id: AttachmentMenuItemId.SYSTEM_MESSAGE,
 		label: 'System Message',
@@ -87,10 +89,7 @@ export const ATTACHMENT_EXTRA_ITEMS: AttachmentMenuItem[] = [
 		enabledWhen: AttachmentItemEnabledWhen.ALWAYS,
 		hasEnabledTooltip: true,
 		action: AttachmentAction.SYSTEM_PROMPT_CLICK
-	}
+	},
-];
-
-export const ATTACHMENT_MCP_ITEMS: AttachmentMenuItem[] = [
 	{
 		id: AttachmentMenuItemId.MCP_PROMPT,
 		label: 'MCP Prompt',
@@ -98,7 +97,10 @@ export const ATTACHMENT_MCP_ITEMS: AttachmentMenuItem[] = [
 		enabledWhen: AttachmentItemEnabledWhen.ALWAYS,
 		action: AttachmentAction.MCP_PROMPT_CLICK,
 		visibleWhen: AttachmentItemVisibleWhen.HAS_MCP_PROMPTS_SUPPORT
-	},
+	}
+];
+
+export const ATTACHMENT_MCP_ITEMS: AttachmentMenuItem[] = [
 	{
 		id: AttachmentMenuItemId.MCP_RESOURCES,
 		label: 'MCP Resources',

tools/ui/src/lib/constants/index.ts

@@ -5,6 +5,8 @@ export * from './agentic';
 export * from './api-endpoints';
 export * from './attachment-labels';
 export * from './database';
+export * from './reasoning-effort';
+export * from './reasoning-effort-tokens';
 export * from './storage';
 export * from './attachment-menu';
 export * from './auto-scroll';

tools/ui/src/lib/constants/reasoning-effort-tokens.ts

@@ -0,0 +1,12 @@
+import { ReasoningEffort } from '$lib/enums';
+
+/**
+ * Reasoning effort to token budget mapping.
+ * Maps the ReasoningEffort enum values to concrete token counts for the server.
+ */
+export const REASONING_EFFORT_TOKENS: Record<string, number> = {
+	[ReasoningEffort.LOW]: 512,
+	[ReasoningEffort.MEDIUM]: 2048,
+	[ReasoningEffort.HIGH]: 8192,
+	[ReasoningEffort.MAX]: -1 // unlimited
+};

tools/ui/src/lib/constants/reasoning-effort.ts

@@ -0,0 +1,21 @@
+import { ReasoningEffort } from '$lib/enums';
+import type { ReasoningEffortLevel } from '$lib/types';
+
+/**
+ * Reasoning effort UI labels.
+ * Keys match the ReasoningEffort enum values for type-safe lookups.
+ */
+export const REASONING_EFFORT_LABELS: Record<string, string> = {
+	[ReasoningEffort.LOW]: 'Low',
+	[ReasoningEffort.MEDIUM]: 'Medium',
+	[ReasoningEffort.HIGH]: 'High',
+	[ReasoningEffort.MAX]: 'Max'
+};
+
+export const REASONING_EFFORT_LEVELS: ReasoningEffortLevel[] = [
+	{ value: 'off', label: 'Off', isOff: true },
+	{ value: ReasoningEffort.LOW, label: 'Low' },
+	{ value: ReasoningEffort.MEDIUM, label: 'Medium' },
+	{ value: ReasoningEffort.HIGH, label: 'High' },
+	{ value: ReasoningEffort.MAX, label: 'Max', hasInfo: true }
+];

tools/ui/src/lib/constants/settings-keys.ts

@@ -29,6 +29,8 @@ export const SETTINGS_KEYS = {
 	ALWAYS_SHOW_SIDEBAR_ON_DESKTOP: 'alwaysShowSidebarOnDesktop',
 	FULL_HEIGHT_CODE_BLOCKS: 'fullHeightCodeBlocks',
 	SHOW_RAW_MODEL_NAMES: 'showRawModelNames',
+	SHOW_MODEL_QUANTIZATION: 'showModelQuantization',
+	SHOW_MODEL_TAGS: 'showModelTags',
 	SHOW_SYSTEM_MESSAGE: 'showSystemMessage',
 	// Sampling
 	TEMPERATURE: 'temperature',
@@ -64,6 +66,7 @@ export const SETTINGS_KEYS = {
 	// Developer
 	DISABLE_REASONING_PARSING: 'disableReasoningParsing',
 	EXCLUDE_REASONING_FROM_CONTEXT: 'excludeReasoningFromContext',
+	ENABLE_THINKING: 'enableThinking',
 	SHOW_RAW_OUTPUT_SWITCH: 'showRawOutputSwitch',
 	// PY_INTERPRETER_ENABLED: 'pyInterpreterEnabled',
 	CUSTOM_JSON: 'customJson',

tools/ui/src/lib/constants/settings-registry.ts

@@ -330,6 +330,30 @@ const SETTINGS_REGISTRY: Record<string, SettingsSectionEntry> = {
 					paramType: SyncableParameterType.BOOLEAN
 				}
 			},
+			{
+				key: SETTINGS_KEYS.SHOW_MODEL_QUANTIZATION,
+				label: 'Show model quantization information',
+				help: 'Display quantization badges (e.g. Q8_0, Q4_K_M) next to model names throughout the interface.',
+				defaultValue: true,
+				type: SettingsFieldType.CHECKBOX,
+				section: SETTINGS_SECTION_SLUGS.DISPLAY,
+				sync: {
+					serverKey: SETTINGS_KEYS.SHOW_MODEL_QUANTIZATION,
+					paramType: SyncableParameterType.BOOLEAN
+				}
+			},
+			{
+				key: SETTINGS_KEYS.SHOW_MODEL_TAGS,
+				label: 'Show model tags',
+				help: 'Display model tags (e.g. "vision", "reasoning") next to model names throughout the interface.',
+				defaultValue: true,
+				type: SettingsFieldType.CHECKBOX,
+				section: SETTINGS_SECTION_SLUGS.DISPLAY,
+				sync: {
+					serverKey: SETTINGS_KEYS.SHOW_MODEL_TAGS,
+					paramType: SyncableParameterType.BOOLEAN
+				}
+			},
 			{
 				key: SETTINGS_KEYS.ALWAYS_SHOW_AGENTIC_TURNS,
 				label: 'Always show agentic turns in conversation',
@@ -646,6 +670,14 @@ const SETTINGS_REGISTRY: Record<string, SettingsSectionEntry> = {
 					paramType: SyncableParameterType.BOOLEAN
 				}
 			},
+			{
+				key: SETTINGS_KEYS.ENABLE_THINKING,
+				label: 'Enable thinking',
+				help: 'Enable model thinking/reasoning for each request. When off, the model will skip the thinking phase and go straight to the response.',
+				defaultValue: false,
+				type: SettingsFieldType.CHECKBOX,
+				section: SETTINGS_SECTION_SLUGS.DEVELOPER
+			},
 			{
 				key: SETTINGS_KEYS.SHOW_RAW_OUTPUT_SWITCH,
 				label: 'Enable raw output toggle',

tools/ui/src/lib/constants/storage.ts

@@ -19,6 +19,8 @@ export const CONFIG_LOCALSTORAGE_KEY = `${STORAGE_APP_NAME}.config`;
 export const DISABLED_TOOLS_LOCALSTORAGE_KEY = `${STORAGE_APP_NAME}.disabledTools`;
 export const FAVORITE_MODELS_LOCALSTORAGE_KEY = `${STORAGE_APP_NAME}.favoriteModels`;
 export const MCP_DEFAULT_ENABLED_LOCALSTORAGE_KEY = `${STORAGE_APP_NAME}.mcpDefaultEnabled`;
+export const THINKING_ENABLED_DEFAULT_LOCALSTORAGE_KEY = `${STORAGE_APP_NAME}.thinkingEnabledDefault`;
+export const REASONING_EFFORT_DEFAULT_LOCALSTORAGE_KEY = `${STORAGE_APP_NAME}.reasoningEffortDefault`;
 export const USER_OVERRIDES_LOCALSTORAGE_KEY = `${STORAGE_APP_NAME}.userOverrides`;
 
 // Deprecated old key names (kept for backward compat while users migrate)

tools/ui/src/lib/enums/index.ts

@@ -19,6 +19,8 @@ export {
 	ReasoningFormat
 } from './chat.enums';
 
+export { ReasoningEffort } from './reasoning-effort.enums';
+
 export {
 	FileTypeCategory,
 	FileTypeImage,

tools/ui/src/lib/enums/reasoning-effort.enums.ts

@@ -0,0 +1,10 @@
+/**
+ * Reasoning effort levels for thinking models.
+ * These values are sent to the server and mapped to token budgets.
+ */
+export enum ReasoningEffort {
+	LOW = 'low',
+	MEDIUM = 'medium',
+	HIGH = 'high',
+	MAX = 'max'
+}

tools/ui/src/lib/hooks/use-tools-panel.svelte.ts

@@ -17,6 +17,8 @@ export interface UseToolsPanelReturn {
 	getFavicon(group: { source: ToolSource; label: string }): string | null;
 	isGroupDisabled(group: ToolGroup): boolean;
 	toggleGroupExpanded(label: string): void;
+	/** Toggle all tools in a group by label (avoids stale group object references). */
+	toggleGroupByLabel(label: string): void;
 	handleOpen(): void;
 }
 
@@ -91,6 +93,13 @@ export function useToolsPanel(): UseToolsPanelReturn {
 		}
 	}
 
+	function toggleGroupByLabel(label: string): void {
+		// Find current group by label to get up-to-date tool references
+		const group = activeGroups.find((g) => g.label === label);
+		if (!group) return;
+		toolsStore.toggleGroup(group);
+	}
+
 	function handleOpen(): void {
 		if (toolsStore.builtinTools.length === 0 && !toolsStore.loading) {
 			toolsStore.fetchBuiltinTools();
@@ -117,6 +126,7 @@ export function useToolsPanel(): UseToolsPanelReturn {
 		getFavicon,
 		isGroupDisabled,
 		toggleGroupExpanded,
+		toggleGroupByLabel,
 		handleOpen
 	};
 }

tools/ui/src/lib/services/chat.service.ts

@@ -6,6 +6,7 @@ import {
 	ATTACHMENT_LABEL_MCP_PROMPT,
 	ATTACHMENT_LABEL_MCP_RESOURCE,
 	LEGACY_AGENTIC_REGEX,
+	REASONING_EFFORT_TOKENS,
 	SETTINGS_KEYS,
 	API_CHAT,
 	API_SLOTS,
@@ -162,6 +163,8 @@ export class ChatService {
 			// Config options
 			disableReasoningParsing,
 			excludeReasoningFromContext,
+			enableThinking,
+			reasoningEffort,
 			continueFinalMessage
 		} = options;
 
@@ -243,6 +246,18 @@ export class ChatService {
 			? ReasoningFormat.NONE
 			: ReasoningFormat.AUTO;
 
+		const reasoningBudgetTokens =
+			enableThinking && reasoningEffort ? (REASONING_EFFORT_TOKENS[reasoningEffort] ?? -1) : -1;
+
+		requestBody.chat_template_kwargs = {
+			...(requestBody.chat_template_kwargs ?? {}),
+			enable_thinking: enableThinking
+		};
+
+		if (reasoningBudgetTokens >= 0) {
+			requestBody.thinking_budget_tokens = reasoningBudgetTokens;
+		}
+
 		// arms the budget sampler so reasoning can be ended at runtime via the control endpoint
 		requestBody.reasoning_control = true;
 

tools/ui/src/lib/stores/chat.svelte.ts

@@ -1852,6 +1852,9 @@ class ChatStore {
 
 		if (currentConfig.excludeReasoningFromContext) apiOptions.excludeReasoningFromContext = true;
 
+		apiOptions.enableThinking = conversationsStore.getThinkingEnabled();
+		apiOptions.reasoningEffort = conversationsStore.getReasoningEffort();
+
 		if (hasValue(currentConfig.temperature))
 			apiOptions.temperature = Number(currentConfig.temperature);
 

tools/ui/src/lib/stores/conversations.svelte.ts

@@ -26,7 +26,7 @@ import { MigrationService } from '$lib/services/migration.service';
 import { config } from '$lib/stores/settings.svelte';
 import { filterByLeafNodeId, findLeafNode, generateConversationTitle } from '$lib/utils';
 import type { McpServerOverride } from '$lib/types/database';
-import { MessageRole, HtmlInputType, FileExtensionText } from '$lib/enums';
+import { MessageRole, HtmlInputType, FileExtensionText, ReasoningEffort } from '$lib/enums';
 import {
 	ISO_DATE_TIME_SEPARATOR,
 	ISO_DATE_TIME_SEPARATOR_REPLACEMENT,
@@ -38,7 +38,9 @@ import {
 	ISO_TIME_SEPARATOR_REPLACEMENT,
 	NON_ALPHANUMERIC_REGEX,
 	MULTIPLE_UNDERSCORE_REGEX,
-	MCP_DEFAULT_ENABLED_LOCALSTORAGE_KEY
+	MCP_DEFAULT_ENABLED_LOCALSTORAGE_KEY,
+	THINKING_ENABLED_DEFAULT_LOCALSTORAGE_KEY,
+	REASONING_EFFORT_DEFAULT_LOCALSTORAGE_KEY
 } from '$lib/constants';
 
 import { ROUTES } from '$lib/constants/routes';
@@ -74,6 +76,12 @@ class ConversationsStore {
 	/** Pending MCP server overrides for new conversations (before first message) */
 	pendingMcpServerOverrides = $state<McpServerOverride[]>(ConversationsStore.loadMcpDefaults());
 
+	/** Global (non-conversation-specific) thinking toggle default */
+	pendingThinkingEnabled = $state(ConversationsStore.loadThinkingDefaults());
+
+	/** Global (non-conversation-specific) reasoning effort default */
+	pendingReasoningEffort = $state<ReasoningEffort>(ConversationsStore.loadReasoningEffortDefault());
+
 	/** Load MCP default overrides from localStorage */
 	private static loadMcpDefaults(): McpServerOverride[] {
 		if (typeof globalThis.localStorage === 'undefined') return [];
@@ -104,6 +112,45 @@ class ConversationsStore {
 		}
 	}
 
+	/** Load thinking-enabled default from localStorage */
+	private static loadThinkingDefaults(): boolean {
+		if (typeof globalThis.localStorage === 'undefined') return false;
+		try {
+			const raw = localStorage.getItem(THINKING_ENABLED_DEFAULT_LOCALSTORAGE_KEY);
+			if (!raw) return false;
+			const parsed = raw === 'true';
+			return typeof parsed === 'boolean' ? parsed : false;
+		} catch {
+			return false;
+		}
+	}
+
+	/** Persist thinking-enabled default to localStorage */
+	private saveThinkingDefaults(): void {
+		if (typeof globalThis.localStorage === 'undefined') return;
+		localStorage.setItem(
+			THINKING_ENABLED_DEFAULT_LOCALSTORAGE_KEY,
+			this.pendingThinkingEnabled ? 'true' : 'false'
+		);
+	}
+
+	/** Load reasoning effort default from localStorage */
+	private static loadReasoningEffortDefault(): ReasoningEffort {
+		if (typeof globalThis.localStorage === 'undefined') return ReasoningEffort.MEDIUM;
+		try {
+			const raw = localStorage.getItem(REASONING_EFFORT_DEFAULT_LOCALSTORAGE_KEY);
+			return (raw as ReasoningEffort) || ReasoningEffort.MEDIUM;
+		} catch {
+			return ReasoningEffort.MEDIUM;
+		}
+	}
+
+	/** Persist reasoning effort default to localStorage */
+	private saveReasoningEffortDefaults(): void {
+		if (typeof globalThis.localStorage === 'undefined') return;
+		localStorage.setItem(REASONING_EFFORT_DEFAULT_LOCALSTORAGE_KEY, this.pendingReasoningEffort);
+	}
+
 	/** Callback for title update confirmation dialog */
 	titleUpdateConfirmationCallback?: (currentTitle: string, newTitle: string) => Promise<boolean>;
 
@@ -253,6 +300,12 @@ class ConversationsStore {
 			this.pendingMcpServerOverrides = [];
 		}
 
+		// Inherit global thinking default into the new conversation
+		conversation.thinkingEnabled = this.pendingThinkingEnabled;
+		await DatabaseService.updateConversation(conversation.id, {
+			thinkingEnabled: this.pendingThinkingEnabled
+		});
+
 		this.conversations = [conversation, ...this.conversations];
 		this.activeConversation = conversation;
 		this.activeMessages = [];
@@ -276,6 +329,7 @@ class ConversationsStore {
 			}
 
 			this.pendingMcpServerOverrides = [];
+			this.pendingThinkingEnabled = false;
 			this.activeConversation = conversation;
 
 			if (conversation.currNode) {
@@ -304,8 +358,9 @@ class ConversationsStore {
 	clearActiveConversation(): void {
 		this.activeConversation = null;
 		this.activeMessages = [];
-		// reload MCP defaults so new chats inherit persisted state
+		// reload defaults so new chats inherit persisted state
 		this.pendingMcpServerOverrides = ConversationsStore.loadMcpDefaults();
+		this.pendingThinkingEnabled = ConversationsStore.loadThinkingDefaults();
 	}
 
 	/**
@@ -703,6 +758,84 @@ class ConversationsStore {
 		this.saveMcpDefaults();
 	}
 
+	/**
+	 * Gets the effective thinking-enabled state for the active conversation.
+	 * Returns the conversation override if set, otherwise the global default.
+	 */
+	getThinkingEnabled(): boolean {
+		if (this.activeConversation) {
+			return this.activeConversation.thinkingEnabled ?? this.pendingThinkingEnabled;
+		}
+		return this.pendingThinkingEnabled;
+	}
+
+	/**
+	 * Sets the thinking-enabled state for the active conversation.
+	 * If no conversation exists, stores the global default.
+	 * @param enabled - The enabled state
+	 */
+	async setThinkingEnabled(enabled: boolean): Promise<void> {
+		if (!this.activeConversation) {
+			this.pendingThinkingEnabled = enabled;
+			this.saveThinkingDefaults();
+			return;
+		}
+
+		this.activeConversation = {
+			...this.activeConversation,
+			thinkingEnabled: enabled
+		};
+
+		await DatabaseService.updateConversation(this.activeConversation.id, {
+			thinkingEnabled: enabled
+		});
+
+		const convIndex = this.conversations.findIndex((c) => c.id === this.activeConversation!.id);
+		if (convIndex !== -1) {
+			this.conversations[convIndex].thinkingEnabled = enabled;
+			this.conversations = [...this.conversations];
+		}
+	}
+
+	/**
+	 * Gets the effective reasoning effort for the active conversation.
+	 * Returns the conversation override if set, otherwise the global default.
+	 */
+	getReasoningEffort(): ReasoningEffort {
+		if (this.activeConversation) {
+			return this.activeConversation.reasoningEffort ?? this.pendingReasoningEffort;
+		}
+		return this.pendingReasoningEffort;
+	}
+
+	/**
+	 * Sets the reasoning effort for the active conversation.
+	 * If no conversation exists, stores the global default.
+	 * @param effort - The effort level ('low' | 'medium' | 'high' | 'max')
+	 */
+	async setReasoningEffort(effort: ReasoningEffort): Promise<void> {
+		if (!this.activeConversation) {
+			this.pendingReasoningEffort = effort;
+			this.saveReasoningEffortDefaults();
+			return;
+		}
+
+		this.activeConversation = {
+			...this.activeConversation,
+			reasoningEffort: effort
+		};
+
+		await DatabaseService.updateConversation(this.activeConversation.id, {
+			reasoningEffort: effort
+		});
+
+		const convIndex = this.conversations.findIndex((c) => c.id === this.activeConversation!.id);
+		if (convIndex !== -1) {
+			this.conversations[convIndex].reasoningEffort = effort;
+			this.conversations = [...this.conversations];
+		}
+	}
+
 	/**
 	 * Forks a conversation at a specific message, creating a new conversation
 	 * containing messages from root up to the target message, then navigates to it.

tools/ui/src/lib/stores/models.svelte.ts

@@ -4,6 +4,10 @@ import { ServerModelStatus, ModelModality } from '$lib/enums';
 import { ModelsService } from '$lib/services/models.service';
 import { PropsService } from '$lib/services/props.service';
 import { serverStore, isRouterMode } from '$lib/stores/server.svelte';
+import {
+	detectThinkingSupport,
+	detectThinkingSupportWithReason
+} from '$lib/utils/chat-template-thinking-detector';
 import { TTLCache } from '$lib/utils';
 import {
 	MODEL_PROPS_CACHE_TTL_MS,
@@ -215,6 +219,67 @@ class ModelsStore {
 
 		return usage !== undefined && usage.size > 0;
 	}
+	//
+	// Thinking Support Detection
+	//
+
+	/**
+	 * Whether the selected model's chat template supports thinking/reasoning.
+	 * Uses heuristic detection on the model's chat_template from /props.
+	 *
+	 * - MODEL mode: uses serverStore.props.chat_template (single loaded model)
+	 * - ROUTER mode: fetches /props?model=<id> for the selected model (cached)
+	 *
+	 * Triggers an async fetch of model props if not yet cached in ROUTER mode.
+	 */
+	get supportsThinking(): boolean {
+		const modelId = this.selectedModelName;
+		if (!modelId) {
+			if (!isRouterMode()) {
+				return detectThinkingSupport(serverStore.props?.chat_template ?? '');
+			}
+			return false;
+		}
+
+		if (isRouterMode() && !this.modelPropsCache.get(modelId)) {
+			this.fetchModelProps(modelId);
+		}
+		const props = this.getModelProps(modelId);
+		return detectThinkingSupport(props?.chat_template ?? '');
+	}
+
+	/**
+	 * Check if a specific model supports thinking.
+	 * Fetches model props if not cached (in router mode).
+	 */
+	checkModelSupportsThinking(modelId: string): boolean {
+		if (!modelId) return false;
+
+		if (isRouterMode() && !this.modelPropsCache.get(modelId)) {
+			this.fetchModelProps(modelId);
+		}
+
+		const props = this.getModelProps(modelId);
+		return detectThinkingSupport(props?.chat_template ?? '');
+	}
+
+	/**
+	 * Detailed thinking support detection result with reason for debugging/UI.
+	 */
+	get thinkingSupportDetails(): { supported: boolean; reason: string } {
+		const modelId = this.selectedModelName;
+		if (!modelId) {
+			if (!isRouterMode()) {
+				return detectThinkingSupportWithReason(serverStore.props?.chat_template ?? '');
+			}
+			return { supported: false, reason: 'No model selected' };
+		}
+		if (isRouterMode() && !this.modelPropsCache.get(modelId)) {
+			this.fetchModelProps(modelId);
+		}
+		const props = this.getModelProps(modelId);
+		return detectThinkingSupportWithReason(props?.chat_template ?? '');
+	}
 
 	/**
 	 *
@@ -362,6 +427,7 @@ class ModelsStore {
 		try {
 			const props = await PropsService.fetchForModel(modelId);
 			this.modelPropsCache.set(modelId, props);
+			this.propsCacheVersion++;
 			return props;
 		} catch (error) {
 			console.warn(`Failed to fetch props for model ${modelId}:`, error);
@@ -755,3 +821,7 @@ export const propsCacheVersion = () => modelsStore.propsCacheVersion;
 export const singleModelName = () => modelsStore.singleModelName;
 export const selectedModelContextSize = () => modelsStore.selectedModelContextSize;
 export const favoriteModelIds = () => modelsStore.favoriteModelIds;
+export const supportsThinking = () => modelsStore.supportsThinking;
+export const checkModelSupportsThinking = (modelId: string) =>
+	modelsStore.checkModelSupportsThinking(modelId);
+export const thinkingSupportDetails = () => modelsStore.thinkingSupportDetails;

tools/ui/src/lib/types/database.d.ts

@@ -1,5 +1,5 @@
 import type { ChatMessageTimings, ChatRole, ChatMessageType } from '$lib/types/chat';
-import { AttachmentType } from '$lib/enums';
+import { AttachmentType, ReasoningEffort } from '$lib/enums';
 
 export interface McpServerOverride {
 	serverId: string;
@@ -12,6 +12,8 @@ export interface DatabaseConversation {
 	lastModified: number;
 	name: string;
 	mcpServerOverrides?: McpServerOverride[];
+	thinkingEnabled?: boolean;
+	reasoningEffort?: ReasoningEffort;
 	forkedFromConversationId?: string;
 }
 

tools/ui/src/lib/types/index.ts

@@ -162,3 +162,6 @@ export type {
 
 // Tools types
 export type { ToolEntry, ToolGroup } from './tools';
+
+// Reasoning
+export type { ReasoningEffortLevel } from './reasoning';

tools/ui/src/lib/types/reasoning.ts

@@ -0,0 +1,6 @@
+export interface ReasoningEffortLevel {
+	value: string;
+	label: string;
+	isOff?: boolean;
+	hasInfo?: boolean;
+}

tools/ui/src/lib/types/settings.d.ts

@@ -2,7 +2,12 @@ import type { SETTING_CONFIG_DEFAULT, SETTINGS_SECTION_TITLES } from '$lib/const
 import type { ChatMessagePromptProgress, ChatMessageTimings } from './chat';
 import type { OpenAIToolDefinition } from './mcp';
 import type { DatabaseMessageExtra } from './database';
-import type { ParameterSource, SyncableParameterType, SettingsFieldType } from '$lib/enums';
+import type {
+	ParameterSource,
+	ReasoningEffort,
+	SyncableParameterType,
+	SettingsFieldType
+} from '$lib/enums';
 import type { Icon } from '@lucide/svelte';
 import type { Component } from 'svelte';
 
@@ -65,6 +70,10 @@ export interface SettingsChatServiceOptions {
 	disableReasoningParsing?: boolean;
 	// Strip reasoning content from context before sending
 	excludeReasoningFromContext?: boolean;
+	// Enable model thinking/reasoning via chat_template_kwargs
+	enableThinking?: boolean;
+	// Reasoning effort level (low/medium/high/max) for thinking models
+	reasoningEffort?: ReasoningEffort;
 	tools?: OpenAIToolDefinition[];
 	// Generation parameters
 	temperature?: number;

tools/ui/src/lib/utils/chat-template-thinking-detector.ts

@@ -0,0 +1,86 @@
+/**
+ * Detects whether a model's chat template supports thinking/reasoning control.
+ *
+ * The server "/props" endpoint does NOT expose a supports_thinking flag.
+ * It is computed internally by common_chat_templates_support_enable_thinking
+ * in common/chat.cpp. A proper server flag would make this unnecessary.
+ *
+ * Detection order (most reliable first):
+ *  1. Thinking-control Jinja2 variables  === pass-through via chat_template_kwargs
+ *  2. Thinking-control Jinja2 conditionals  === template-native on/off logic
+ *  3. Paired thinking-content tag pairs    === models that output special tags
+ */
+
+const THINKING_KWARG_VARS = ['enable_thinking', 'reasoning_effort', 'thinking_budget'];
+
+/**
+ * Paired thinking-content tag patterns.
+ *
+ * Inspected: llama-cpp-deepseek-r1/v3, nim-nemotron-{3,4}-nano, qwen-qwq-32b,
+ * qwen-3-32b, google-gemma-4-31b-it, kimikimi-k2-thinking, apertus-8b-instruct,
+ * mistralai-Mistral-Small-3.2-24B, ByteDance-Seed-OSS.
+ *
+ * The self-closing entry is Kimi-K2, Gemma4 fixed-length pair,
+ * where both tags always appear adjacent with no content between.
+ */
+const THINKING_TAG_PATTERNS: Array<[string, string | null]> = [
+	['<think>', '</think>'],
+	['<|channel>thought', '<|channel|>'],
+	['<|think|>', '</|think|>'],
+	['<seed:think|>', '</seed:think|>'],
+	['<think></think>', null]
+];
+
+const JINJA_THINKING_CONDITIONALS: RegExp[] = [
+	// Matches: {% if enable thinking %}, {% if enable_thinking %}, {% if (enable_thinking is defined) %}
+	// Handles: underscore-separated (enable_thinking), space-separated (enable thinking),
+	// and optional parens/brackets before enable (if (enable_thinking )
+	/\{%-?\s*if\s+\(?\s*\w*enable[\s_]+\w*(thinking|think|reasoning)/i,
+	/\{%-?\s*if\s+\w*(thinking|reasoning)\s*(is not|==|!=)/i,
+	/\{%-?\s*if\s+not\s+\w*enable/i,
+	/\{%-?\s*if\s+ns\.enable_thinking/i
+];
+
+/** Guards against false positives:
+ *  - Generic thought keyword (tool descriptions say "chain of thought")
+ *  - Qwen vertical-bar token (used for ALL tool calls, not thinking)
+ */
+export function detectThinkingSupport(t: string): boolean {
+	if (!t) return false;
+	for (const kwarg of THINKING_KWARG_VARS) {
+		const regex = new RegExp(
+			`(\\{\\{[^{}]*\\b${kwarg}\\b[^{}]*\\}\\}|\\{%[^{}]*\\b${kwarg}\\b[^{}]*%\\})`,
+			'i'
+		);
+		if (regex.test(t)) return true;
+	}
+	for (const p of JINJA_THINKING_CONDITIONALS) {
+		if (p.test(t)) return true;
+	}
+	for (const [s, e] of THINKING_TAG_PATTERNS) {
+		if (t.includes(s) && (!e || t.includes(e))) return true;
+	}
+	return false;
+}
+
+export function detectThinkingSupportWithReason(t: string): { supported: boolean; reason: string } {
+	if (!t) return { supported: false, reason: 'No chat template available' };
+	for (const kwarg of THINKING_KWARG_VARS) {
+		const regex = new RegExp(
+			`(\\{\\{[^{}]*\\b${kwarg}\\b[^{}]*\\}\\}|\\{%[^{}]*\\b${kwarg}\\b[^{}]*%\\})`,
+			'i'
+		);
+		if (regex.test(t)) {
+			return { supported: true, reason: 'Found: ' + kwarg };
+		}
+	}
+	for (const p of JINJA_THINKING_CONDITIONALS) {
+		if (p.test(t)) return { supported: true, reason: 'Found: thinking conditional' };
+	}
+	for (const [s, e] of THINKING_TAG_PATTERNS) {
+		if (t.includes(s) && (!e || t.includes(e))) {
+			return { supported: true, reason: 'Found: ' + s + (e ? ' .. ' + e : ' (self)') };
+		}
+	}
+	return { supported: false, reason: 'No thinking patterns found' };
+}

tools/ui/tests/e2e/demo.test.ts

@@ -1,6 +1,7 @@
 import { expect, test } from '@playwright/test';
 
-test('home page has expected h1', async ({ page }) => {
+test('home page loads correctly', async ({ page }) => {
 	await page.goto('/');
-	await expect(page.locator('h1').first()).toBeVisible();
+	// Wait for the greeting to become visible (stores need time to initialize)
+	await expect(page.locator('h1', { hasText: /Hello there/ })).toBeVisible();
 });

tools/ui/tests/stories/ChatScreenForm.a11y.stories.svelte

@@ -44,7 +44,7 @@
 		await screen.findByRole('menu');
 
 		await waitFor(() => {
-			expect(document.activeElement).toHaveTextContent('Text Files');
+			expect(document.activeElement).toHaveTextContent('Add files');
 		});
 	}}
 />

tools/ui/vite.config.ts

@@ -10,6 +10,8 @@ import { llamaCppBuildPlugin } from './scripts/vite-plugin-llama-cpp-build';
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 
+const SERVER_ORIGIN = import.meta.env?.VITE_PUBLIC_SERVER_ORIGIN || 'http://localhost:8080';
+
 export default defineConfig({
 	resolve: {
 		alias: {
@@ -75,12 +77,12 @@ export default defineConfig({
 
 	server: {
 		proxy: {
-			'/v1': 'http://localhost:8080',
+			'/v1': SERVER_ORIGIN,
-			'/props': 'http://localhost:8080',
+			'/props': SERVER_ORIGIN,
-			'/models': 'http://localhost:8080',
+			'/models': SERVER_ORIGIN,
-			'/tools': 'http://localhost:8080',
+			'/tools': SERVER_ORIGIN,
-			'/slots': 'http://localhost:8080',
+			'/slots': SERVER_ORIGIN,
-			'/cors-proxy': 'http://localhost:8080'
+			'/cors-proxy': SERVER_ORIGIN
 		},
 		headers: {
 			'Cross-Origin-Embedder-Policy': 'require-corp',