diff --git a/tools/server/webui/src/lib/agentic/openai-sse-client.ts b/tools/server/webui/src/lib/clients/openai-sse.ts
similarity index 98%
rename from tools/server/webui/src/lib/agentic/openai-sse-client.ts
rename to tools/server/webui/src/lib/clients/openai-sse.ts
index 8f9c2b8ac5..2de9533d1d 100644
--- a/tools/server/webui/src/lib/agentic/openai-sse-client.ts
+++ b/tools/server/webui/src/lib/clients/openai-sse.ts
@@ -5,7 +5,7 @@ import type {
 } from '$lib/types/api';
 import type { ChatMessagePromptProgress, ChatMessageTimings } from '$lib/types/chat';
 import { mergeToolCallDeltas, extractModelName } from '$lib/utils/chat-stream';
-import type { AgenticChatCompletionRequest } from './types';
+import type { AgenticChatCompletionRequest } from '$lib/types/agentic';
 
 export type OpenAISseCallbacks = {
 	onChunk?: (chunk: string) => void;
diff --git a/tools/server/webui/src/lib/components/app/chat/ChatMessages/AgenticContent.svelte b/tools/server/webui/src/lib/components/app/chat/ChatMessages/AgenticContent.svelte
index cb55c12327..f1f8b2362d 100644
--- a/tools/server/webui/src/lib/components/app/chat/ChatMessages/AgenticContent.svelte
+++ b/tools/server/webui/src/lib/components/app/chat/ChatMessages/AgenticContent.svelte
@@ -14,7 +14,7 @@
 	} from '$lib/components/app';
 	import { config } from '$lib/stores/settings.svelte';
 	import { Wrench, Loader2 } from '@lucide/svelte';
-	import { AgenticSectionType } from '$lib/types/agentic';
+	import { AgenticSectionType } from '$lib/enums';
 	import { AGENTIC_TAGS, AGENTIC_REGEX } from '$lib/constants/agentic';
 	import { formatJsonPretty } from '$lib/utils/formatters';
 
@@ -38,16 +38,20 @@
 
 	const showToolCallInProgress = $derived(config().showToolCallInProgress as boolean);
 
-	function isExpanded(index: number, isPending: boolean): boolean {
-		if (showToolCallInProgress && isPending) {
-			return true;
-		}
+	function getDefaultExpanded(isPending: boolean): boolean {
+		return showToolCallInProgress && isPending;
+	}
 
-		return expandedStates[index] ?? showToolCallInProgress;
+	function isExpanded(index: number, isPending: boolean): boolean {
+		if (expandedStates[index] !== undefined) {
+			return expandedStates[index];
+		}
+		return getDefaultExpanded(isPending);
 	}
 
 	function toggleExpanded(index: number, isPending: boolean) {
-		expandedStates[index] = !isExpanded(index, isPending);
+		const currentState = isExpanded(index, isPending);
+		expandedStates[index] = !currentState;
 	}
 
 	function parseAgenticContent(rawContent: string): AgenticSection[] {
diff --git a/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessage.svelte b/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessage.svelte
index 3ded592344..47bb81a6a7 100644
--- a/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessage.svelte
+++ b/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessage.svelte
@@ -10,6 +10,7 @@
 	import { DatabaseService } from '$lib/services';
 	import { config } from '$lib/stores/settings.svelte';
 	import { SYSTEM_MESSAGE_PLACEHOLDER } from '$lib/constants/ui';
+	import { MessageRole } from '$lib/enums';
 	import { copyToClipboard, isIMEComposing, formatMessageForClipboard } from '$lib/utils';
 	import ChatMessageAssistant from './ChatMessageAssistant.svelte';
 	import ChatMessageUser from './ChatMessageUser.svelte';
@@ -70,7 +71,7 @@
 	let textareaElement: HTMLTextAreaElement | undefined = $state();
 
 	let thinkingContent = $derived.by(() => {
-		if (message.role === 'assistant') {
+		if (message.role === MessageRole.ASSISTANT) {
 			const trimmedThinking = message.thinking?.trim();
 
 			return trimmedThinking ? trimmedThinking : null;
@@ -92,7 +93,7 @@
 		isEditing = false;
 
 		// If canceling a new system message with placeholder content, remove it without deleting children
-		if (message.role === 'system') {
+		if (message.role === MessageRole.SYSTEM) {
 			const conversationDeleted = await removeSystemPromptPlaceholder(message.id);
 
 			if (conversationDeleted) {
@@ -136,7 +137,7 @@
 		isEditing = true;
 		// Clear temporary placeholder content for system messages
 		editedContent =
-			message.role === 'system' && message.content === SYSTEM_MESSAGE_PLACEHOLDER
+			message.role === MessageRole.SYSTEM && message.content === SYSTEM_MESSAGE_PLACEHOLDER
 				? ''
 				: message.content;
 		textareaElement?.focus();
@@ -179,7 +180,7 @@
 	}
 
 	async function handleSaveEdit() {
-		if (message.role === 'system') {
+		if (message.role === MessageRole.SYSTEM) {
 			// System messages: update in place without branching
 			const newContent = editedContent.trim();
 
@@ -198,7 +199,7 @@
 			if (index !== -1) {
 				conversationsStore.updateMessageAtIndex(index, { content: newContent });
 			}
-		} else if (message.role === 'user') {
+		} else if (message.role === MessageRole.USER) {
 			const finalExtras = await getMergedExtras();
 			onEditWithBranching?.(message, editedContent.trim(), finalExtras);
 		} else {
@@ -213,7 +214,7 @@
 	}
 
 	async function handleSaveEditOnly() {
-		if (message.role === 'user') {
+		if (message.role === MessageRole.USER) {
 			// For user messages, trim to avoid accidental whitespace
 			const finalExtras = await getMergedExtras();
 			onEditUserMessagePreserveResponses?.(message, editedContent.trim(), finalExtras);
@@ -240,7 +241,7 @@
 	}
 </script>
 
-{#if message.role === 'system'}
+{#if message.role === MessageRole.SYSTEM}
 	<ChatMessageSystem
 		bind:textareaElement
 		class={className}
@@ -261,7 +262,7 @@
 		{showDeleteDialog}
 		{siblingInfo}
 	/>
-{:else if message.role === 'user'}
+{:else if message.role === MessageRole.USER}
 	<ChatMessageUser
 		bind:textareaElement
 		class={className}
diff --git a/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageActions.svelte b/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageActions.svelte
index dbd9b98228..681d49c89b 100644
--- a/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageActions.svelte
+++ b/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageActions.svelte
@@ -6,9 +6,10 @@
 		DialogConfirmation
 	} from '$lib/components/app';
 	import { Switch } from '$lib/components/ui/switch';
+	import { MessageRole } from '$lib/enums';
 
 	interface Props {
-		role: 'user' | 'assistant';
+		role: MessageRole.USER | MessageRole.ASSISTANT;
 		justify: 'start' | 'end';
 		actionsPosition: 'left' | 'right';
 		siblingInfo?: ChatMessageSiblingInfo | null;
@@ -77,11 +78,11 @@
 				<ActionButton icon={Edit} tooltip="Edit" onclick={onEdit} />
 			{/if}
 
-			{#if role === 'assistant' && onRegenerate}
+			{#if role === MessageRole.ASSISTANT && onRegenerate}
 				<ActionButton icon={RefreshCw} tooltip="Regenerate" onclick={() => onRegenerate()} />
 			{/if}
 
-			{#if role === 'assistant' && onContinue}
+			{#if role === MessageRole.ASSISTANT && onContinue}
 				<ActionButton icon={ArrowRight} tooltip="Continue" onclick={onContinue} />
 			{/if}
 
diff --git a/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageAssistant.svelte b/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageAssistant.svelte
index f5c9a37bef..d36ea5aaa7 100644
--- a/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageAssistant.svelte
+++ b/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageAssistant.svelte
@@ -17,6 +17,7 @@
 	import { Button } from '$lib/components/ui/button';
 	import { Checkbox } from '$lib/components/ui/checkbox';
 	import { INPUT_CLASSES } from '$lib/constants/css-classes';
+	import { MessageRole } from '$lib/enums';
 	import Label from '$lib/components/ui/label/label.svelte';
 	import { config } from '$lib/stores/settings.svelte';
 	import { conversationsStore } from '$lib/stores/conversations.svelte';
@@ -245,7 +246,7 @@
 
 	{#if message.timestamp && !isEditing}
 		<ChatMessageActions
-			role="assistant"
+			role={MessageRole.ASSISTANT}
 			justify="start"
 			actionsPosition="left"
 			{siblingInfo}
diff --git a/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageSystem.svelte b/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageSystem.svelte
index 4866c3c360..5ccb3a1b27 100644
--- a/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageSystem.svelte
+++ b/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageSystem.svelte
@@ -6,6 +6,7 @@
 	import { INPUT_CLASSES } from '$lib/constants/css-classes';
 	import { config } from '$lib/stores/settings.svelte';
 	import ChatMessageActions from './ChatMessageActions.svelte';
+	import { MessageRole } from '$lib/enums';
 
 	interface Props {
 		class?: string;
@@ -211,7 +212,7 @@
 					{onShowDeleteDialogChange}
 					{siblingInfo}
 					{showDeleteDialog}
-					role="user"
+					role={MessageRole.USER}
 				/>
 			</div>
 		{/if}
diff --git a/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageUser.svelte b/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageUser.svelte
index 0bf8cde390..5c301eb8b2 100644
--- a/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageUser.svelte
+++ b/tools/server/webui/src/lib/components/app/chat/ChatMessages/ChatMessageUser.svelte
@@ -4,6 +4,7 @@
 	import { config } from '$lib/stores/settings.svelte';
 	import ChatMessageActions from './ChatMessageActions.svelte';
 	import ChatMessageEditForm from './ChatMessageEditForm.svelte';
+	import { MessageRole } from '$lib/enums';
 
 	interface Props {
 		class?: string;
@@ -156,7 +157,7 @@
 					{onShowDeleteDialogChange}
 					{siblingInfo}
 					{showDeleteDialog}
-					role="user"
+					role={MessageRole.USER}
 				/>
 			</div>
 		{/if}
diff --git a/tools/server/webui/src/lib/components/app/dialogs/DialogMcpServersSettings.svelte b/tools/server/webui/src/lib/components/app/dialogs/DialogMcpServersSettings.svelte
index 504c882d0f..5620417891 100644
--- a/tools/server/webui/src/lib/components/app/dialogs/DialogMcpServersSettings.svelte
+++ b/tools/server/webui/src/lib/components/app/dialogs/DialogMcpServersSettings.svelte
@@ -1,9 +1,8 @@
 <script lang="ts">
 	import * as Dialog from '$lib/components/ui/dialog';
-	import McpSettingsSection from '../mcp/McpSettingsSection.svelte';
 	import { config, settingsStore } from '$lib/stores/settings.svelte';
 	import { Button } from '$lib/components/ui/button';
-	import McpLogo from '../misc/McpLogo.svelte';
+	import { McpLogo, McpSettingsSection } from '$lib/components/app';
 
 	interface Props {
 		onOpenChange?: (open: boolean) => void;
diff --git a/tools/server/webui/src/lib/components/app/index.ts b/tools/server/webui/src/lib/components/app/index.ts
index 7ad1669d2b..bb8de869f3 100644
--- a/tools/server/webui/src/lib/components/app/index.ts
+++ b/tools/server/webui/src/lib/components/app/index.ts
@@ -60,7 +60,7 @@ export { default as ActionButton } from './misc/ActionButton.svelte';
 export { default as ActionDropdown } from './misc/ActionDropdown.svelte';
 export { default as BadgeChatStatistic } from './misc/BadgeChatStatistic.svelte';
 export { default as BadgeInfo } from './misc/BadgeInfo.svelte';
-export { default as ModelBadge } from './models/ModelBadge.svelte';
+export { default as McpLogo } from './misc/McpLogo.svelte';
 export { default as BadgeModality } from './misc/BadgeModality.svelte';
 export { default as ConversationSelection } from './misc/ConversationSelection.svelte';
 export { default as CopyToClipboardIcon } from './misc/CopyToClipboardIcon.svelte';
@@ -70,6 +70,10 @@ export { default as RemoveButton } from './misc/RemoveButton.svelte';
 export { default as SearchInput } from './misc/SearchInput.svelte';
 export { default as SearchableDropdownMenu } from './misc/SearchableDropdownMenu.svelte';
 export { default as SyntaxHighlightedCode } from './misc/SyntaxHighlightedCode.svelte';
+
+// Models
+
+export { default as ModelBadge } from './models/ModelBadge.svelte';
 export { default as ModelsSelector } from './models/ModelsSelector.svelte';
 
 // MCP
diff --git a/tools/server/webui/src/lib/types/agentic.ts b/tools/server/webui/src/lib/enums/agentic.ts
similarity index 53%
rename from tools/server/webui/src/lib/types/agentic.ts
rename to tools/server/webui/src/lib/enums/agentic.ts
index 9d79fe2e8f..aad7a69e83 100644
--- a/tools/server/webui/src/lib/types/agentic.ts
+++ b/tools/server/webui/src/lib/enums/agentic.ts
@@ -1,13 +1,3 @@
-/**
- * Agentic orchestration configuration.
- */
-export interface AgenticConfig {
-	enabled: boolean;
-	maxTurns: number;
-	maxToolPreviewLines: number;
-	filterReasoningAfterFirstTurn: boolean;
-}
-
 /**
  * Types of sections in agentic content display.
  */
diff --git a/tools/server/webui/src/lib/enums/chat.ts b/tools/server/webui/src/lib/enums/chat.ts
index 2b9eb7bc2e..f05d43049f 100644
--- a/tools/server/webui/src/lib/enums/chat.ts
+++ b/tools/server/webui/src/lib/enums/chat.ts
@@ -2,3 +2,22 @@ export enum ChatMessageStatsView {
 	GENERATION = 'generation',
 	READING = 'reading'
 }
+
+/**
+ * Message roles for chat messages.
+ */
+export enum MessageRole {
+	USER = 'user',
+	ASSISTANT = 'assistant',
+	SYSTEM = 'system'
+}
+
+/**
+ * Message types for different content kinds.
+ */
+export enum MessageType {
+	ROOT = 'root',
+	TEXT = 'text',
+	THINK = 'think',
+	SYSTEM = 'system'
+}
diff --git a/tools/server/webui/src/lib/enums/index.ts b/tools/server/webui/src/lib/enums/index.ts
index 83c86caf66..1dfde85ec5 100644
--- a/tools/server/webui/src/lib/enums/index.ts
+++ b/tools/server/webui/src/lib/enums/index.ts
@@ -1,6 +1,8 @@
 export { AttachmentType } from './attachment';
 
-export { ChatMessageStatsView } from './chat';
+export { AgenticSectionType } from './agentic';
+
+export { ChatMessageStatsView, MessageRole, MessageType } from './chat';
 
 export {
 	FileTypeCategory,
diff --git a/tools/server/webui/src/lib/errors/index.ts b/tools/server/webui/src/lib/errors/index.ts
new file mode 100644
index 0000000000..d19f14cced
--- /dev/null
+++ b/tools/server/webui/src/lib/errors/index.ts
@@ -0,0 +1 @@
+export { MCPError } from './mcp';
diff --git a/tools/server/webui/src/lib/errors/mcp.ts b/tools/server/webui/src/lib/errors/mcp.ts
new file mode 100644
index 0000000000..0de8b640d5
--- /dev/null
+++ b/tools/server/webui/src/lib/errors/mcp.ts
@@ -0,0 +1,14 @@
+/**
+ * MCP-specific error class with error code and optional data.
+ */
+export class MCPError extends Error {
+	code: number;
+	data?: unknown;
+
+	constructor(message: string, code: number, data?: unknown) {
+		super(message);
+		this.name = 'MCPError';
+		this.code = code;
+		this.data = data;
+	}
+}
diff --git a/tools/server/webui/src/lib/mcp/host-manager.ts b/tools/server/webui/src/lib/mcp/host-manager.ts
index 9fbf5f55b7..fe21105e12 100644
--- a/tools/server/webui/src/lib/mcp/host-manager.ts
+++ b/tools/server/webui/src/lib/mcp/host-manager.ts
@@ -28,7 +28,7 @@ import type {
 	ClientCapabilities,
 	Implementation
 } from '$lib/types/mcp';
-import { MCPError } from '$lib/types/mcp';
+import { MCPError } from '$lib/errors';
 import type { Tool } from '@modelcontextprotocol/sdk/types.js';
 
 export interface MCPHostManagerConfig {
diff --git a/tools/server/webui/src/lib/mcp/index.ts b/tools/server/webui/src/lib/mcp/index.ts
index c3866313b9..e9a618e5ac 100644
--- a/tools/server/webui/src/lib/mcp/index.ts
+++ b/tools/server/webui/src/lib/mcp/index.ts
@@ -8,8 +8,10 @@ export type {
 	ToolExecutionResult
 } from './server-connection';
 
+// Errors
+export { MCPError } from '$lib/errors';
+
 // Types
-export { MCPError } from '$lib/types/mcp';
 export type {
 	MCPClientConfig,
 	MCPServerConfig,
diff --git a/tools/server/webui/src/lib/mcp/server-connection.ts b/tools/server/webui/src/lib/mcp/server-connection.ts
index 7070070136..3ddf2c32f1 100644
--- a/tools/server/webui/src/lib/mcp/server-connection.ts
+++ b/tools/server/webui/src/lib/mcp/server-connection.ts
@@ -23,7 +23,7 @@ import { WebSocketClientTransport } from '@modelcontextprotocol/sdk/client/webso
 import type { Tool } from '@modelcontextprotocol/sdk/types.js';
 import type { Transport } from '@modelcontextprotocol/sdk/shared/transport.js';
 import type { MCPServerConfig, ClientCapabilities, Implementation } from '$lib/types/mcp';
-import { MCPError } from '$lib/types/mcp';
+import { MCPError } from '$lib/errors';
 import { DEFAULT_MCP_CONFIG } from '$lib/constants/mcp';
 
 // Type for tool call result content item
diff --git a/tools/server/webui/src/lib/stores/agentic.svelte.ts b/tools/server/webui/src/lib/stores/agentic.svelte.ts
index ff39dd6a07..8180933cb9 100644
--- a/tools/server/webui/src/lib/stores/agentic.svelte.ts
+++ b/tools/server/webui/src/lib/stores/agentic.svelte.ts
@@ -21,13 +21,13 @@
  */
 
 import { mcpStore } from '$lib/stores/mcp.svelte';
-import { OpenAISseClient, type OpenAISseTurnResult } from '$lib/agentic/openai-sse-client';
-import {
-	toAgenticMessages,
-	type AgenticMessage,
-	type AgenticChatCompletionRequest,
-	type AgenticToolCallList
-} from '$lib/agentic/types';
+import { OpenAISseClient, type OpenAISseTurnResult } from '$lib/clients/openai-sse';
+import type {
+	AgenticMessage,
+	AgenticChatCompletionRequest,
+	AgenticToolCallList
+} from '$lib/types/agentic';
+import { toAgenticMessages } from '$lib/utils';
 import type { ApiChatCompletionToolCall, ApiChatMessageData } from '$lib/types/api';
 import type { ChatMessagePromptProgress, ChatMessageTimings } from '$lib/types/chat';
 import type { MCPToolCall } from '$lib/types/mcp';
diff --git a/tools/server/webui/src/lib/types/agentic.d.ts b/tools/server/webui/src/lib/types/agentic.d.ts
new file mode 100644
index 0000000000..9a33b34a33
--- /dev/null
+++ b/tools/server/webui/src/lib/types/agentic.d.ts
@@ -0,0 +1,51 @@
+import type { ApiChatCompletionRequest, ApiChatMessageContentPart } from './api';
+
+/**
+ * Agentic orchestration configuration.
+ */
+export interface AgenticConfig {
+	enabled: boolean;
+	maxTurns: number;
+	maxToolPreviewLines: number;
+	filterReasoningAfterFirstTurn: boolean;
+}
+
+/**
+ * Tool call payload for agentic messages.
+ */
+export type AgenticToolCallPayload = {
+	id: string;
+	type: 'function';
+	function: {
+		name: string;
+		arguments: string;
+	};
+};
+
+/**
+ * Agentic message types for different roles.
+ */
+export type AgenticMessage =
+	| {
+			role: 'system' | 'user';
+			content: string | ApiChatMessageContentPart[];
+	  }
+	| {
+			role: 'assistant';
+			content?: string | ApiChatMessageContentPart[];
+			tool_calls?: AgenticToolCallPayload[];
+	  }
+	| {
+			role: 'tool';
+			tool_call_id: string;
+			content: string;
+	  };
+
+export type AgenticAssistantMessage = Extract<AgenticMessage, { role: 'assistant' }>;
+export type AgenticToolCallList = NonNullable<AgenticAssistantMessage['tool_calls']>;
+
+export type AgenticChatCompletionRequest = Omit<ApiChatCompletionRequest, 'messages'> & {
+	messages: AgenticMessage[];
+	stream: true;
+	tools?: ApiChatCompletionRequest['tools'];
+};
diff --git a/tools/server/webui/src/lib/types/chat.d.ts b/tools/server/webui/src/lib/types/chat.d.ts
index 0e706b72b6..77809b1e6a 100644
--- a/tools/server/webui/src/lib/types/chat.d.ts
+++ b/tools/server/webui/src/lib/types/chat.d.ts
@@ -1,6 +1,3 @@
-export type ChatMessageType = 'root' | 'text' | 'think' | 'system';
-export type ChatRole = 'user' | 'assistant' | 'system';
-
 export interface ChatUploadedFile {
 	id: string;
 	name: string;
diff --git a/tools/server/webui/src/lib/types/index.ts b/tools/server/webui/src/lib/types/index.ts
index 2a21c6dcfa..7c58015cd1 100644
--- a/tools/server/webui/src/lib/types/index.ts
+++ b/tools/server/webui/src/lib/types/index.ts
@@ -32,17 +32,15 @@ export type {
 	ApiRouterModelsUnloadResponse
 } from './api';
 
-// Chat types
+// Chat types - interfaces only (enums are in $lib/enums)
 export type {
-	ChatMessageType,
-	ChatRole,
 	ChatUploadedFile,
 	ChatAttachmentDisplayItem,
 	ChatAttachmentPreviewItem,
 	ChatMessageSiblingInfo,
 	ChatMessagePromptProgress,
 	ChatMessageTimings
-} from './chat';
+} from './chat.d';
 
 // Database types
 export type {
diff --git a/tools/server/webui/src/lib/types/mcp.ts b/tools/server/webui/src/lib/types/mcp.ts
index 82e168f254..e4f195ac17 100644
--- a/tools/server/webui/src/lib/types/mcp.ts
+++ b/tools/server/webui/src/lib/types/mcp.ts
@@ -10,18 +10,6 @@ export type { Tool, CallToolResult };
 export type ClientCapabilities = SDKClientCapabilities;
 export type Implementation = SDKImplementation;
 
-export class MCPError extends Error {
-	code: number;
-	data?: unknown;
-
-	constructor(message: string, code: number, data?: unknown) {
-		super(message);
-		this.name = 'MCPError';
-		this.code = code;
-		this.data = data;
-	}
-}
-
 export type MCPTransportType = 'websocket' | 'streamable_http';
 
 export type MCPServerConfig = {
diff --git a/tools/server/webui/src/lib/agentic/types.ts b/tools/server/webui/src/lib/utils/agentic.ts
similarity index 50%
rename from tools/server/webui/src/lib/agentic/types.ts
rename to tools/server/webui/src/lib/utils/agentic.ts
index c3b61195f4..9143113a3a 100644
--- a/tools/server/webui/src/lib/agentic/types.ts
+++ b/tools/server/webui/src/lib/utils/agentic.ts
@@ -1,43 +1,9 @@
-import type {
-	ApiChatCompletionRequest,
-	ApiChatMessageContentPart,
-	ApiChatMessageData
-} from '$lib/types/api';
-
-export type AgenticToolCallPayload = {
-	id: string;
-	type: 'function';
-	function: {
-		name: string;
-		arguments: string;
-	};
-};
-
-export type AgenticMessage =
-	| {
-			role: 'system' | 'user';
-			content: string | ApiChatMessageContentPart[];
-	  }
-	| {
-			role: 'assistant';
-			content?: string | ApiChatMessageContentPart[];
-			tool_calls?: AgenticToolCallPayload[];
-	  }
-	| {
-			role: 'tool';
-			tool_call_id: string;
-			content: string;
-	  };
-
-export type AgenticAssistantMessage = Extract<AgenticMessage, { role: 'assistant' }>;
-export type AgenticToolCallList = NonNullable<AgenticAssistantMessage['tool_calls']>;
-
-export type AgenticChatCompletionRequest = Omit<ApiChatCompletionRequest, 'messages'> & {
-	messages: AgenticMessage[];
-	stream: true;
-	tools?: ApiChatCompletionRequest['tools'];
-};
+import type { ApiChatMessageData } from '$lib/types/api';
+import type { AgenticMessage } from '$lib/types/agentic';
 
+/**
+ * Converts API messages to agentic format.
+ */
 export function toAgenticMessages(messages: ApiChatMessageData[]): AgenticMessage[] {
 	return messages.map((message) => {
 		if (message.role === 'assistant' && message.tool_calls && message.tool_calls.length > 0) {
diff --git a/tools/server/webui/src/lib/utils/index.ts b/tools/server/webui/src/lib/utils/index.ts
index ab60061991..f750e888bb 100644
--- a/tools/server/webui/src/lib/utils/index.ts
+++ b/tools/server/webui/src/lib/utils/index.ts
@@ -94,3 +94,6 @@ export { getLanguageFromFilename } from './syntax-highlight-language';
 
 // Text file utilities
 export { isTextFileByName, readFileAsText, isLikelyTextFile } from './text-files';
+
+// Agentic utilities
+export { toAgenticMessages } from './agentic';