webui: Add MCP CORS Proxy detection logic & UI (#20167)

* refactor: MCP store cleanup

* feat: Add MCP proxy availability detection

* fix: Sidebar icon

* chore: update webui build output

* chore: Formatting

* chore: update webui build output

* chore: Update package lock

* chore: update webui build output

* chore: update webui build output

* chore: update webui build output

tools/server/webui/package-lock.json

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 			"dev": true,
 			"license": "Apache-2.0",
-			"peer": true,
 			"dependencies": {
 				"@swc/helpers": "^0.5.0"
 			}
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"ts-dedent": "^2.0.0",
 				"type-fest": "~2.19"
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@standard-schema/spec": "^1.0.0",
 				"@sveltejs/acorn-typescript": "^1.0.5",
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@sveltejs/vite-plugin-svelte-inspector": "^5.0.0",
 				"debug": "^4.4.1",
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@babel/code-frame": "^7.10.4",
 				"@babel/runtime": "^7.12.5",
@@ -2873,7 +2868,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"undici-types": "~7.16.0"
 			}
@@ -2940,7 +2934,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@typescript-eslint/scope-manager": "8.56.0",
 				"@typescript-eslint/types": "8.56.0",
@@ -3177,7 +3170,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@testing-library/dom": "^10.4.0",
 				"@testing-library/user-event": "^14.6.1",
@@ -3305,7 +3297,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@vitest/utils": "3.2.4",
 				"pathe": "^2.0.3",
@@ -3376,7 +3367,6 @@
 			"resolved": "https://registry.npmjs.org/acorn/-/acorn-8.15.0.tgz",
 			"integrity": "sha512-NZyJarBfL7nWwIq+FDL6Zp/yHEhePMNnnJ0y3qfieCrmNvYct8uvtiV41UvlSe6apAfk0fY1FbWx+NwfmpvtTg==",
 			"license": "MIT",
-			"peer": true,
 			"bin": {
 				"acorn": "bin/acorn"
 			},
@@ -4094,7 +4084,8 @@
 			"resolved": "https://registry.npmjs.org/csstype/-/csstype-3.1.3.tgz",
 			"integrity": "sha512-M1uQkMl8rQK/szD0LNhtqxIPLpimGm8sOBwU7lLnCpSbTyY3yeU1Vc7l4KT5zT4s/yOxHH5O7tIuuLOCnLADRw==",
 			"dev": true,
-			"license": "MIT"
+			"license": "MIT",
+			"peer": true
 		},
 		"node_modules/debug": {
 			"version": "4.4.3",
@@ -4404,7 +4395,6 @@
 			"dev": true,
 			"hasInstallScript": true,
 			"license": "MIT",
-			"peer": true,
 			"bin": {
 				"esbuild": "bin/esbuild"
 			},
@@ -4465,7 +4455,6 @@
 			"integrity": "sha512-LEyamqS7W5HB3ujJyvi0HQK/dtVINZvd5mAAp9eT5S/ujByGjiZLCzPcHVzuXbpJDJF/cxwHlfceVUDZ2lnSTw==",
 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@eslint-community/eslint-utils": "^4.8.0",
 				"@eslint-community/regexpp": "^4.12.1",
@@ -5672,7 +5661,6 @@
 			"resolved": "https://registry.npmjs.org/hono/-/hono-4.11.7.tgz",
 			"integrity": "sha512-l7qMiNee7t82bH3SeyUCt9UF15EVmaBvsppY2zQtrbIhl/yzBTny+YUxsVjSjQ6gaqaeVtZmGocom8TzBlA4Yw==",
 			"license": "MIT",
-			"peer": true,
 			"engines": {
 				"node": ">=16.9.0"
 			}
@@ -8097,7 +8085,6 @@
 				}
 			],
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"nanoid": "^3.3.11",
 				"picocolors": "^1.1.1",
@@ -8231,7 +8218,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"bin": {
 				"prettier": "bin/prettier.cjs"
 			},
@@ -8248,7 +8234,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"peerDependencies": {
 				"prettier": "^3.0.0",
 				"svelte": "^3.2.0 || ^4.0.0-next.0 || ^5.0.0-next.0"
@@ -8480,7 +8465,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"engines": {
 				"node": ">=0.10.0"
 			}
@@ -8491,7 +8475,6 @@
 			"integrity": "sha512-Xs1hdnE+DyKgeHJeJznQmYMIBG3TKIHJJT95Q58nHLSrElKlGQqDTR2HQ9fx5CN/Gk6Vh/kupBTDLU11/nDk/g==",
 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"scheduler": "^0.26.0"
 			},
@@ -8766,7 +8749,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@types/estree": "1.0.8"
 			},
@@ -8877,7 +8859,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"chokidar": "^4.0.0",
 				"immutable": "^5.0.2",
@@ -9172,7 +9153,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@storybook/global": "^5.0.0",
 				"@storybook/icons": "^2.0.1",
@@ -9387,7 +9367,6 @@
 			"resolved": "https://registry.npmjs.org/svelte/-/svelte-5.48.3.tgz",
 			"integrity": "sha512-w7QZ398cdNherTdiQ/v3SYLLGOO4948Jgjh04PYqtTYVohmBvbmFwLmo7pp8gp4/1tceRWfSTjHgjtfpCVNJmQ==",
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@jridgewell/remapping": "^2.3.4",
 				"@jridgewell/sourcemap-codec": "^1.5.0",
@@ -9633,7 +9612,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"funding": {
 				"type": "github",
 				"url": "https://github.com/sponsors/dcastil"
@@ -9664,8 +9642,7 @@
 			"resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.1.11.tgz",
 			"integrity": "sha512-2E9TBm6MDD/xKYe+dvJZAmg3yxIEDNRc0jwlNyDg/4Fil2QcSLjFKGVff0lAf1jjeaArlG/M75Ey/EYr/OJtBA==",
 			"dev": true,
-			"license": "MIT",
+			"license": "MIT"
-			"peer": true
 		},
 		"node_modules/tapable": {
 			"version": "2.2.2",
@@ -9942,7 +9919,6 @@
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 			"dev": true,
 			"license": "Apache-2.0",
-			"peer": true,
 			"bin": {
 				"tsc": "bin/tsc",
 				"tsserver": "bin/tsserver"
@@ -10336,7 +10312,6 @@
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 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"esbuild": "^0.25.0",
 				"fdir": "^6.5.0",
@@ -10497,7 +10472,6 @@
 			"integrity": "sha512-LUCP5ev3GURDysTWiP47wRRUpLKMOfPh+yKTx3kVIEiu5KOMeqzpnYNsKyOoVrULivR8tLcks4+lga33Whn90A==",
 			"dev": true,
 			"license": "MIT",
-			"peer": true,
 			"dependencies": {
 				"@types/chai": "^5.2.2",
 				"@vitest/expect": "3.2.4",
@@ -10819,7 +10793,6 @@
 			"resolved": "https://registry.npmjs.org/zod/-/zod-4.2.1.tgz",
 			"integrity": "sha512-0wZ1IRqGGhMP76gLqz8EyfBXKk0J2qo2+H3fi4mcUP/KtTocoX08nmIAHl1Z2kJIZbZee8KOpBCSNPRgauucjw==",
 			"license": "MIT",
-			"peer": true,
 			"funding": {
 				"url": "https://github.com/sponsors/colinhacks"
 			}

tools/server/webui/src/lib/components/app/mcp/McpServerForm.svelte

@@ -6,6 +6,7 @@
 	import { parseHeadersToArray, serializeHeaders } from '$lib/utils';
 	import { UrlProtocol } from '$lib/enums';
 	import { MCP_SERVER_URL_PLACEHOLDER } from '$lib/constants';
+	import { mcpStore } from '$lib/stores/mcp.svelte';
 
 	interface Props {
 		url: string;
@@ -62,14 +63,33 @@
 		{/if}
 
 		{#if !isWebSocket && onUseProxyChange}
-			<label class="mt-3 flex cursor-pointer items-center gap-2">
+			<label
+				class="mt-3 flex items-start gap-2"
+				class:cursor-pointer={mcpStore.isProxyAvailable}
+				class:opacity-80={!mcpStore.isProxyAvailable}
+			>
 				<Switch
+					class="mt-1"
 					id="use-proxy-{id}"
 					checked={useProxy}
+					disabled={!mcpStore.isProxyAvailable}
 					onCheckedChange={(checked) => onUseProxyChange?.(checked)}
 				/>
 
-				<span class="text-xs text-muted-foreground">Use llama-server proxy</span>
+				<span>
+					<span class="text-xs text-muted-foreground">Use llama-server proxy</span>
+
+					<br />
+
+					{#if !mcpStore.isProxyAvailable}
+						<span class="inline-flex gap-0.75 text-xs text-muted-foreground/60"
+							>(Run <pre>llama-server</pre>
+							with
+							<pre>--webui-mcp-proxy</pre>
+							flag)</span
+						>
+					{/if}
+				</span>
 			</label>
 		{/if}
 	</div>

tools/server/webui/src/lib/stores/mcp.svelte.ts

@@ -20,6 +20,7 @@
  */
 
 import { browser } from '$app/environment';
+import { base } from '$app/paths';
 import { MCPService } from '$lib/services/mcp.service';
 import { config, settingsStore } from '$lib/stores/settings.svelte';
 import { mcpResourceStore } from '$lib/stores/mcp-resources.svelte';
@@ -42,6 +43,7 @@ import {
 	ToolCallType
 } from '$lib/enums';
 import {
+	CORS_PROXY_ENDPOINT,
 	DEFAULT_CACHE_TTL_MS,
 	DEFAULT_MCP_CONFIG,
 	EXPECTED_THEMED_ICON_PAIR_COUNT,
@@ -78,165 +80,13 @@ import type { ListChangedHandlers } from '@modelcontextprotocol/sdk/types.js';
 import type { DatabaseMessageExtraMcpResource, McpServerOverride } from '$lib/types/database';
 import type { SettingsConfigType } from '$lib/types/settings';
 
-export function buildMcpClientConfig(
-	cfg: SettingsConfigType,
-	perChatOverrides?: McpServerOverride[]
-): MCPClientConfig | undefined {
-	return buildMcpClientConfigInternal(cfg, perChatOverrides);
-}
-
-/**
- * Internal helper to build MCP client config.
- * Kept as standalone function for external use and tests.
- */
-export function buildMcpClientConfigInternal(
-	cfg: SettingsConfigType,
-	perChatOverrides?: McpServerOverride[]
-): MCPClientConfig | undefined {
-	const rawServers = parseServerSettings(cfg.mcpServers);
-	if (!rawServers.length) {
-		return undefined;
-	}
-
-	const servers: Record<string, MCPServerConfig> = {};
-
-	for (const [index, entry] of rawServers.entries()) {
-		if (!checkServerEnabled(entry, perChatOverrides)) continue;
-		const normalized = buildServerConfig(entry);
-		if (normalized) servers[generateMcpServerId(entry.id, index)] = normalized;
-	}
-
-	if (Object.keys(servers).length === 0) {
-		return undefined;
-	}
-
-	return {
-		protocolVersion: DEFAULT_MCP_CONFIG.protocolVersion,
-		capabilities: DEFAULT_MCP_CONFIG.capabilities,
-		clientInfo: DEFAULT_MCP_CONFIG.clientInfo,
-		requestTimeoutMs: Math.round(DEFAULT_MCP_CONFIG.requestTimeoutSeconds * 1000),
-		servers
-	};
-}
-
-/**
- * Generates a unique server ID from an optional ID string or index.
- * @deprecated Use MCPStore.#generateServerId instead
- */
-function generateMcpServerId(id: unknown, index: number): string {
-	if (typeof id === 'string' && id.trim()) {
-		return id.trim();
-	}
-
-	return `${MCP_SERVER_ID_PREFIX}-${index + 1}`;
-}
-
-/**
- * Parses raw server settings from config into MCPServerSettingsEntry array.
- * @deprecated Use MCPStore.#parseServerSettings instead
- */
-function parseServerSettings(rawServers: unknown): MCPServerSettingsEntry[] {
-	if (!rawServers) {
-		return [];
-	}
-
-	let parsed: unknown;
-	if (typeof rawServers === 'string') {
-		const trimmed = rawServers.trim();
-		if (!trimmed) {
-			return [];
-		}
-
-		try {
-			parsed = JSON.parse(trimmed);
-		} catch (error) {
-			console.warn('[MCP] Failed to parse mcpServers JSON:', error);
-
-			return [];
-		}
-	} else {
-		parsed = rawServers;
-	}
-	if (!Array.isArray(parsed)) {
-		return [];
-	}
-
-	return parsed.map((entry, index) => {
-		const url = typeof entry?.url === 'string' ? entry.url.trim() : '';
-		const headers = typeof entry?.headers === 'string' ? entry.headers.trim() : undefined;
-
-		return {
-			id: generateMcpServerId((entry as { id?: unknown })?.id, index),
-			enabled: Boolean((entry as { enabled?: unknown })?.enabled),
-			url,
-			name: (entry as { name?: string })?.name,
-			requestTimeoutSeconds: DEFAULT_MCP_CONFIG.requestTimeoutSeconds,
-			headers: headers || undefined,
-			useProxy: Boolean((entry as { useProxy?: unknown })?.useProxy)
-		} satisfies MCPServerSettingsEntry;
-	});
-}
-
-/**
- * Builds server configuration from a settings entry.
- * @deprecated Use MCPStore.#buildServerConfig instead
- */
-function buildServerConfig(
-	entry: MCPServerSettingsEntry,
-	connectionTimeoutMs = DEFAULT_MCP_CONFIG.connectionTimeoutMs
-): MCPServerConfig | undefined {
-	if (!entry?.url) {
-		return undefined;
-	}
-
-	let headers: Record<string, string> | undefined;
-	if (entry.headers) {
-		try {
-			const parsed = JSON.parse(entry.headers);
-			if (typeof parsed === 'object' && parsed !== null && !Array.isArray(parsed))
-				headers = parsed as Record<string, string>;
-		} catch {
-			console.warn('[MCP] Failed to parse custom headers JSON:', entry.headers);
-		}
-	}
-
-	return {
-		url: entry.url,
-		transport: detectMcpTransportFromUrl(entry.url),
-		handshakeTimeoutMs: connectionTimeoutMs,
-		requestTimeoutMs: Math.round(entry.requestTimeoutSeconds * 1000),
-		headers,
-		useProxy: entry.useProxy
-	};
-}
-
-/**
- * Checks if a server is enabled, considering per-chat overrides.
- * @deprecated Use MCPStore.#checkServerEnabled instead
- */
-function checkServerEnabled(
-	server: MCPServerSettingsEntry,
-	perChatOverrides?: McpServerOverride[]
-): boolean {
-	if (!server.enabled) {
-		return false;
-	}
-
-	if (perChatOverrides) {
-		const override = perChatOverrides.find((o) => o.serverId === server.id);
-
-		return override?.enabled ?? false;
-	}
-
-	return false;
-}
-
 class MCPStore {
 	private _isInitializing = $state(false);
 	private _error = $state<string | null>(null);
 	private _toolCount = $state(0);
 	private _connectedServers = $state<string[]>([]);
 	private _healthChecks = $state<Record<string, HealthCheckState>>({});
+	private _proxyAvailable = $state(false);
 
 	private connections = new Map<string, MCPConnection>();
 	private toolsIndex = new Map<string, string>();
@@ -246,6 +96,29 @@ class MCPStore {
 	private initPromise: Promise<boolean> | null = null;
 	private activeFlowCount = 0;
 
+	constructor() {
+		if (browser) {
+			this.probeProxy();
+		}
+	}
+
+	/**
+	 * Probes the CORS proxy endpoint to determine availability.
+	 * The endpoint is only registered when llama-server runs with --webui-mcp-proxy.
+	 */
+	async probeProxy(): Promise<void> {
+		try {
+			const response = await fetch(`${base}${CORS_PROXY_ENDPOINT}`, { method: 'HEAD' });
+			this._proxyAvailable = response.status !== 404;
+		} catch {
+			this._proxyAvailable = false;
+		}
+	}
+
+	get isProxyAvailable(): boolean {
+		return this._proxyAvailable;
+	}
+
 	/**
 	 * Generates a unique server ID from an optional ID string or index.
 	 */
@@ -520,6 +393,7 @@ class MCPStore {
 
 	getServerLabel(server: MCPServerSettingsEntry): string {
 		const healthState = this.getHealthCheckState(server.id);
+
 		if (healthState?.status === HealthCheckStatus.SUCCESS)
 			return (
 				healthState.serverInfo?.title || healthState.serverInfo?.name || server.name || server.url
@@ -603,6 +477,7 @@ class MCPStore {
 	 */
 	#proxyIconSrc(src: string): string {
 		if (src.startsWith('data:')) return src;
+		if (!this._proxyAvailable) return src;
 
 		return getProxiedUrlString(src);
 	}
@@ -629,7 +504,7 @@ class MCPStore {
 			}
 		}
 
-		return getFaviconUrl(server.url);
+		return getFaviconUrl(server.url, this._proxyAvailable);
 	}
 
 	isAnyServerLoading(): boolean {
@@ -2072,6 +1947,7 @@ export const mcpIsInitializing = () => mcpStore.isInitializing;
 export const mcpIsInitialized = () => mcpStore.isInitialized;
 export const mcpError = () => mcpStore.error;
 export const mcpIsEnabled = () => mcpStore.isEnabled;
+export const mcpIsProxyAvailable = () => mcpStore.isProxyAvailable;
 export const mcpAvailableTools = () => mcpStore.availableTools;
 export const mcpConnectedServerCount = () => mcpStore.connectedServerCount;
 export const mcpConnectedServerNames = () => mcpStore.connectedServerNames;

tools/server/webui/src/lib/utils/favicon.ts

@@ -17,7 +17,7 @@ import {
  * @param urlString - The URL to get the favicon for
  * @returns The favicon URL or null if invalid
  */
-export function getFaviconUrl(urlString: string): string | null {
+export function getFaviconUrl(urlString: string, useProxy = true): string | null {
 	try {
 		const url = new URL(urlString);
 		const hostnameParts = url.hostname.split(DOMAIN_SEPARATOR);
@@ -27,7 +27,7 @@ export function getFaviconUrl(urlString: string): string | null {
 				: url.hostname;
 
 		const googleFaviconUrl = `${GOOGLE_FAVICON_BASE_URL}?domain=${rootDomain}&sz=${DEFAULT_FAVICON_SIZE}`;
-		return getProxiedUrlString(googleFaviconUrl);
+		return useProxy ? getProxiedUrlString(googleFaviconUrl) : googleFaviconUrl;
 	} catch {
 		return null;
 	}

tools/server/webui/src/routes/+layout.svelte

@@ -231,7 +231,7 @@
 				<Sidebar.Trigger
 					class="transition-left absolute left-0 z-[900] duration-200 ease-linear {sidebarOpen
 						? 'md:left-[var(--sidebar-width)]'
-						: ''}"
+						: 'md:left-0!'}"
 					style="translate: 1rem 1rem;"
 				/>
 			{/if}