diff --git a/ui/src/ui/app-lifecycle.ts b/ui/src/ui/app-lifecycle.ts
index 9a9826103a8..a40f5d5ee28 100644
--- a/ui/src/ui/app-lifecycle.ts
+++ b/ui/src/ui/app-lifecycle.ts
@@ -17,10 +17,14 @@ import {
   syncTabWithLocation,
   syncThemeWithSettings,
 } from "./app-settings.ts";
+import { loadControlUiBootstrapConfig } from "./controllers/control-ui-bootstrap.ts";
 
 type LifecycleHost = {
   basePath: string;
   tab: Tab;
+  assistantName: string;
+  assistantAvatar: string | null;
+  assistantAgentId: string | null;
   chatHasAutoScrolled: boolean;
   chatManualRefreshInFlight: boolean;
   chatLoading: boolean;
@@ -36,6 +40,7 @@ type LifecycleHost = {
 
 export function handleConnected(host: LifecycleHost) {
   host.basePath = inferBasePath();
+  void loadControlUiBootstrapConfig(host);
   applySettingsFromUrl(host as unknown as Parameters<typeof applySettingsFromUrl>[0]);
   syncTabWithLocation(host as unknown as Parameters<typeof syncTabWithLocation>[0], true);
   syncThemeWithSettings(host as unknown as Parameters<typeof syncThemeWithSettings>[0]);
diff --git a/ui/src/ui/app.ts b/ui/src/ui/app.ts
index bb2c9f1540f..8709cbd32d0 100644
--- a/ui/src/ui/app.ts
+++ b/ui/src/ui/app.ts
@@ -76,7 +76,7 @@ import {
   type ToolStreamEntry,
   type CompactionStatus,
 } from "./app-tool-stream.ts";
-import { resolveInjectedAssistantIdentity } from "./assistant-identity.ts";
+import { normalizeAssistantIdentity } from "./assistant-identity.ts";
 import { loadAssistantIdentity as loadAssistantIdentityInternal } from "./controllers/assistant-identity.ts";
 import { loadSettings, type UiSettings } from "./storage.ts";
 import { type ChatAttachment, type ChatQueueItem, type CronFormState } from "./ui-types.ts";
@@ -87,7 +87,7 @@ declare global {
   }
 }
 
-const injectedAssistantIdentity = resolveInjectedAssistantIdentity();
+const bootAssistantIdentity = normalizeAssistantIdentity({});
 
 function resolveOnboardingMode(): boolean {
   if (!window.location.search) {
@@ -118,9 +118,9 @@ export class OpenClawApp extends LitElement {
   private toolStreamSyncTimer: number | null = null;
   private sidebarCloseTimer: number | null = null;
 
-  @state() assistantName = injectedAssistantIdentity.name;
-  @state() assistantAvatar = injectedAssistantIdentity.avatar;
-  @state() assistantAgentId = injectedAssistantIdentity.agentId ?? null;
+  @state() assistantName = bootAssistantIdentity.name;
+  @state() assistantAvatar = bootAssistantIdentity.avatar;
+  @state() assistantAgentId = bootAssistantIdentity.agentId ?? null;
 
   @state() sessionKey = this.settings.sessionKey;
   @state() chatLoading = false;
diff --git a/ui/src/ui/assistant-identity.ts b/ui/src/ui/assistant-identity.ts
index 4b9fef54e10..3f6e14fa925 100644
--- a/ui/src/ui/assistant-identity.ts
+++ b/ui/src/ui/assistant-identity.ts
@@ -10,13 +10,6 @@ export type AssistantIdentity = {
   avatar: string | null;
 };
 
-declare global {
-  interface Window {
-    __OPENCLAW_ASSISTANT_NAME__?: string;
-    __OPENCLAW_ASSISTANT_AVATAR__?: string;
-  }
-}
-
 function coerceIdentityValue(value: string | undefined, maxLength: number): string | undefined {
   if (typeof value !== "string") {
     return undefined;
@@ -40,13 +33,3 @@ export function normalizeAssistantIdentity(
     typeof input?.agentId === "string" && input.agentId.trim() ? input.agentId.trim() : null;
   return { agentId, name, avatar };
 }
-
-export function resolveInjectedAssistantIdentity(): AssistantIdentity {
-  if (typeof window === "undefined") {
-    return normalizeAssistantIdentity({});
-  }
-  return normalizeAssistantIdentity({
-    name: window.__OPENCLAW_ASSISTANT_NAME__,
-    avatar: window.__OPENCLAW_ASSISTANT_AVATAR__,
-  });
-}
diff --git a/ui/src/ui/controllers/control-ui-bootstrap.test.ts b/ui/src/ui/controllers/control-ui-bootstrap.test.ts
new file mode 100644
index 00000000000..3c9e73fa092
--- /dev/null
+++ b/ui/src/ui/controllers/control-ui-bootstrap.test.ts
@@ -0,0 +1,60 @@
+/* @vitest-environment jsdom */
+
+import { describe, expect, it, vi } from "vitest";
+import { loadControlUiBootstrapConfig } from "./control-ui-bootstrap.ts";
+
+describe("loadControlUiBootstrapConfig", () => {
+  it("loads assistant identity from the bootstrap endpoint", async () => {
+    const fetchMock = vi.fn().mockResolvedValue({
+      ok: true,
+      json: async () => ({
+        basePath: "/openclaw",
+        assistantName: "Ops",
+        assistantAvatar: "O",
+        assistantAgentId: "main",
+      }),
+    });
+    vi.stubGlobal("fetch", fetchMock as unknown as typeof fetch);
+
+    const state = {
+      basePath: "/openclaw",
+      assistantName: "Assistant",
+      assistantAvatar: null,
+      assistantAgentId: null,
+    };
+
+    await loadControlUiBootstrapConfig(state);
+
+    expect(fetchMock).toHaveBeenCalledWith(
+      "/openclaw/__openclaw/control-ui-config.json",
+      expect.objectContaining({ method: "GET" }),
+    );
+    expect(state.assistantName).toBe("Ops");
+    expect(state.assistantAvatar).toBe("O");
+    expect(state.assistantAgentId).toBe("main");
+
+    vi.unstubAllGlobals();
+  });
+
+  it("ignores failures", async () => {
+    const fetchMock = vi.fn().mockResolvedValue({ ok: false });
+    vi.stubGlobal("fetch", fetchMock as unknown as typeof fetch);
+
+    const state = {
+      basePath: "",
+      assistantName: "Assistant",
+      assistantAvatar: null,
+      assistantAgentId: null,
+    };
+
+    await loadControlUiBootstrapConfig(state);
+
+    expect(fetchMock).toHaveBeenCalledWith(
+      "/__openclaw/control-ui-config.json",
+      expect.objectContaining({ method: "GET" }),
+    );
+    expect(state.assistantName).toBe("Assistant");
+
+    vi.unstubAllGlobals();
+  });
+});
diff --git a/ui/src/ui/controllers/control-ui-bootstrap.ts b/ui/src/ui/controllers/control-ui-bootstrap.ts
new file mode 100644
index 00000000000..b161cf150d6
--- /dev/null
+++ b/ui/src/ui/controllers/control-ui-bootstrap.ts
@@ -0,0 +1,52 @@
+import { normalizeAssistantIdentity } from "../assistant-identity.ts";
+import { normalizeBasePath } from "../navigation.ts";
+
+type ControlUiBootstrapConfig = {
+  basePath?: string;
+  assistantName?: string;
+  assistantAvatar?: string;
+  assistantAgentId?: string;
+};
+
+export type ControlUiBootstrapState = {
+  basePath: string;
+  assistantName: string;
+  assistantAvatar: string | null;
+  assistantAgentId: string | null;
+};
+
+export async function loadControlUiBootstrapConfig(state: ControlUiBootstrapState) {
+  if (typeof window === "undefined") {
+    return;
+  }
+  if (typeof fetch !== "function") {
+    return;
+  }
+
+  const basePath = normalizeBasePath(state.basePath ?? "");
+  const url = basePath
+    ? `${basePath}/__openclaw/control-ui-config.json`
+    : "/__openclaw/control-ui-config.json";
+
+  try {
+    const res = await fetch(url, {
+      method: "GET",
+      headers: { Accept: "application/json" },
+      credentials: "same-origin",
+    });
+    if (!res.ok) {
+      return;
+    }
+    const parsed = (await res.json()) as ControlUiBootstrapConfig;
+    const normalized = normalizeAssistantIdentity({
+      agentId: parsed.assistantAgentId ?? null,
+      name: parsed.assistantName,
+      avatar: parsed.assistantAvatar ?? null,
+    });
+    state.assistantName = normalized.name;
+    state.assistantAvatar = normalized.avatar;
+    state.assistantAgentId = normalized.agentId ?? null;
+  } catch {
+    // Ignore bootstrap failures; UI will update identity after connecting.
+  }
+}