diff --git a/packages/ui/src/lib/runtime-env.ts b/packages/ui/src/lib/runtime-env.ts
new file mode 100644
index 00000000..1bfde961
--- /dev/null
+++ b/packages/ui/src/lib/runtime-env.ts
@@ -0,0 +1,82 @@
+export type HostRuntime = "electron" | "tauri" | "web"
+export type PlatformKind = "desktop" | "mobile"
+
+export interface RuntimeEnvironment {
+  host: HostRuntime
+  platform: PlatformKind
+}
+
+declare global {
+  interface Window {
+    electronAPI?: unknown
+    __TAURI__?: {
+      invoke?: <T = unknown>(cmd: string, args?: Record<string, unknown>) => Promise<T>
+      event?: {
+        listen: (event: string, handler: (payload: { payload: unknown }) => void) => Promise<() => void>
+      }
+    }
+  }
+}
+
+function detectHost(): HostRuntime {
+  if (typeof window === "undefined") {
+    return "web"
+  }
+
+  const win = window as Window & { electronAPI?: unknown }
+  if (typeof win.electronAPI !== "undefined") {
+    return "electron"
+  }
+
+  if (typeof win.__TAURI__ !== "undefined") {
+    return "tauri"
+  }
+
+  if (typeof navigator !== "undefined" && /tauri/i.test(navigator.userAgent)) {
+    return "tauri"
+  }
+
+  return "web"
+}
+
+function detectPlatform(): PlatformKind {
+  if (typeof navigator === "undefined") {
+    return "desktop"
+  }
+
+  const uaData = (navigator as any).userAgentData
+  if (uaData?.mobile) {
+    return "mobile"
+  }
+
+  const ua = navigator.userAgent.toLowerCase()
+  if (/android|iphone|ipad|ipod|blackberry|mini|windows phone|mobile|silk/.test(ua)) {
+    return "mobile"
+  }
+
+  return "desktop"
+}
+
+let cachedEnv: RuntimeEnvironment | null = null
+
+export function detectRuntimeEnvironment(): RuntimeEnvironment {
+  if (cachedEnv) {
+    return cachedEnv
+  }
+  cachedEnv = {
+    host: detectHost(),
+    platform: detectPlatform(),
+  }
+  if (typeof console !== "undefined") {
+    const message = `[runtime] host=${cachedEnv.host} platform=${cachedEnv.platform}`
+    console.info(message)
+  }
+  return cachedEnv
+}
+
+export const runtimeEnv = detectRuntimeEnvironment()
+
+export const isElectronHost = () => runtimeEnv.host === "electron"
+export const isTauriHost = () => runtimeEnv.host === "tauri"
+export const isWebHost = () => runtimeEnv.host === "web"
+export const isMobilePlatform = () => runtimeEnv.platform === "mobile"
diff --git a/packages/ui/src/main.tsx b/packages/ui/src/main.tsx
index cbcf57d6..6f74c473 100644
--- a/packages/ui/src/main.tsx
+++ b/packages/ui/src/main.tsx
@@ -3,6 +3,7 @@ import App from "./App"
 import { ThemeProvider } from "./lib/theme"
 import { ConfigProvider } from "./stores/preferences"
 import { InstanceConfigProvider } from "./stores/instance-config"
+import { runtimeEnv } from "./lib/runtime-env"
 import "./index.css"
 import "@git-diff-view/solid/styles/diff-view-pure.css"
 
@@ -12,6 +13,11 @@ if (!root) {
   throw new Error("Root element not found")
 }
 
+if (typeof document !== "undefined") {
+  document.documentElement.dataset.runtimeHost = runtimeEnv.host
+  document.documentElement.dataset.runtimePlatform = runtimeEnv.platform
+}
+
 render(
   () => (
     <ConfigProvider>
diff --git a/packages/ui/src/renderer/loading/main.tsx b/packages/ui/src/renderer/loading/main.tsx
index 65c0c581..da12874e 100644
--- a/packages/ui/src/renderer/loading/main.tsx
+++ b/packages/ui/src/renderer/loading/main.tsx
@@ -1,6 +1,7 @@
 import { createSignal, onCleanup, onMount } from "solid-js"
 import { render } from "solid-js/web"
 import iconUrl from "../../images/CodeNomad-Icon.png"
+import { runtimeEnv, isTauriHost } from "../../lib/runtime-env"
 import "../../index.css"
 import "./loading.css"
 
@@ -17,6 +18,12 @@ const phrases = [
   "Persuading the AI to give you keyboard control…",
 ]
 
+const hostStatusMap: Record<typeof runtimeEnv.host, string> = {
+  electron: "Starting desktop shell…",
+  tauri: "Starting native shell…",
+  web: "Connecting to CodeNomad…",
+}
+
 interface CliStatus {
   state?: string
   url?: string | null
@@ -30,12 +37,6 @@ interface TauriBridge {
   }
 }
 
-declare global {
-  interface Window {
-    __TAURI__?: TauriBridge
-  }
-}
-
 function pickPhrase(previous?: string) {
   const filtered = phrases.filter((phrase) => phrase !== previous)
   const source = filtered.length > 0 ? filtered : phrases
@@ -52,26 +53,34 @@ function getTauriBridge(): TauriBridge | null {
   if (typeof window === "undefined") {
     return null
   }
-  const bridge = (window as any).__TAURI__ as TauriBridge | undefined
+  const bridge = (window as { __TAURI__?: TauriBridge }).__TAURI__
   if (!bridge || !bridge.event || !bridge.invoke) {
     return null
   }
   return bridge
 }
 
+function annotateDocument() {
+  if (typeof document === "undefined") {
+    return
+  }
+  document.documentElement.dataset.runtimeHost = runtimeEnv.host
+  document.documentElement.dataset.runtimePlatform = runtimeEnv.platform
+}
+
 function LoadingApp() {
   const [phrase, setPhrase] = createSignal(pickPhrase())
   const [error, setError] = createSignal<string | null>(null)
-  const [status, setStatus] = createSignal<string>("Starting services…")
+  const [status, setStatus] = createSignal<string>(hostStatusMap[runtimeEnv.host] ?? "Starting services…")
 
   const changePhrase = () => setPhrase(pickPhrase(phrase()))
 
   onMount(() => {
+    annotateDocument()
     setPhrase(pickPhrase())
-    const tauriBridge = getTauriBridge()
     const unsubscribers: Array<() => void> = []
 
-    async function bootstrapTauri() {
+    async function bootstrapTauri(tauriBridge: TauriBridge | null) {
       if (!tauriBridge || !tauriBridge.event || !tauriBridge.invoke) {
         return
       }
@@ -115,7 +124,9 @@ function LoadingApp() {
       }
     }
 
-    void bootstrapTauri()
+    if (isTauriHost()) {
+      void bootstrapTauri(getTauriBridge())
+    }
 
     onCleanup(() => {
       unsubscribers.forEach((unsubscribe) => {