diff --git a/webui/src/components/settings/SettingsView.tsx b/webui/src/components/settings/SettingsView.tsx
index 5c6a88574..fa74c36a1 100644
--- a/webui/src/components/settings/SettingsView.tsx
+++ b/webui/src/components/settings/SettingsView.tsx
@@ -69,6 +69,7 @@ import {
   updateSettings,
   updateWebSearchSettings,
 } from "@/lib/api";
+import { notifyCliAppsChanged } from "@/lib/cli-app-events";
 import { cn } from "@/lib/utils";
 import { useClient } from "@/providers/ClientProvider";
 import type {
@@ -626,6 +627,9 @@ export function SettingsView({
     try {
       const payload = await runCliAppAction(token, action, name);
       setCliApps(payload);
+      if (action !== "test") {
+        notifyCliAppsChanged(payload);
+      }
       setCliAppsMessage(payload.last_action?.message ?? null);
       setCliAppsFocusName(action === "uninstall" ? null : name);
     } catch (err) {
diff --git a/webui/src/components/thread/ThreadShell.tsx b/webui/src/components/thread/ThreadShell.tsx
index cd65d3a31..d288e84ad 100644
--- a/webui/src/components/thread/ThreadShell.tsx
+++ b/webui/src/components/thread/ThreadShell.tsx
@@ -20,6 +20,11 @@ import { ThreadViewport } from "@/components/thread/ThreadViewport";
 import { useNanobotStream, type SendImage, type SendOptions } from "@/hooks/useNanobotStream";
 import { useSessionHistory } from "@/hooks/useSessions";
 import { fetchCliApps, listSlashCommands } from "@/lib/api";
+import {
+  CLI_APPS_CHANGED_EVENT,
+  installedCliAppsFromPayload,
+  isCliAppsPayload,
+} from "@/lib/cli-app-events";
 import type { ChatSummary, CliAppInfo, SlashCommand, UIMessage } from "@/lib/types";
 import { normalizeLegacyLongTaskMessages } from "@/lib/thread-display-compat";
 import { scrubSubagentUiMessages } from "@/lib/subagent-channel-display";
@@ -251,7 +256,7 @@ export function ThreadShell({
   const refreshCliApps = useCallback(async () => {
     try {
       const payload = await fetchCliApps(token);
-      setCliApps(payload.apps.filter((app) => app.installed));
+      setCliApps(installedCliAppsFromPayload(payload));
     } catch {
       setCliApps([]);
     }
@@ -262,7 +267,7 @@ export function ThreadShell({
     const load = async () => {
       try {
         const payload = await fetchCliApps(token);
-        if (!cancelled) setCliApps(payload.apps.filter((app) => app.installed));
+        if (!cancelled) setCliApps(installedCliAppsFromPayload(payload));
       } catch {
         if (!cancelled) setCliApps([]);
       }
@@ -275,10 +280,20 @@ export function ThreadShell({
     };
     window.addEventListener("focus", refreshOnFocus);
     document.addEventListener("visibilitychange", refreshOnFocus);
+    const refreshOnCliAppsChanged = (event: Event) => {
+      const payload = (event as CustomEvent<unknown>).detail;
+      if (isCliAppsPayload(payload)) {
+        setCliApps(installedCliAppsFromPayload(payload));
+        return;
+      }
+      void refreshCliApps();
+    };
+    window.addEventListener(CLI_APPS_CHANGED_EVENT, refreshOnCliAppsChanged);
     return () => {
       cancelled = true;
       window.removeEventListener("focus", refreshOnFocus);
       document.removeEventListener("visibilitychange", refreshOnFocus);
+      window.removeEventListener(CLI_APPS_CHANGED_EVENT, refreshOnCliAppsChanged);
     };
   }, [refreshCliApps, token]);
 
diff --git a/webui/src/lib/cli-app-events.ts b/webui/src/lib/cli-app-events.ts
new file mode 100644
index 000000000..204303047
--- /dev/null
+++ b/webui/src/lib/cli-app-events.ts
@@ -0,0 +1,22 @@
+import type { CliAppInfo, CliAppsPayload } from "@/lib/types";
+
+export const CLI_APPS_CHANGED_EVENT = "nanobot:cli-apps-changed";
+
+export function isCliAppsPayload(value: unknown): value is CliAppsPayload {
+  return (
+    !!value &&
+    typeof value === "object" &&
+    Array.isArray((value as { apps?: unknown }).apps)
+  );
+}
+
+export function installedCliAppsFromPayload(payload: CliAppsPayload): CliAppInfo[] {
+  return payload.apps.filter((app) => app.installed);
+}
+
+export function notifyCliAppsChanged(payload: CliAppsPayload): void {
+  if (typeof window === "undefined") return;
+  window.dispatchEvent(new CustomEvent<CliAppsPayload>(CLI_APPS_CHANGED_EVENT, {
+    detail: payload,
+  }));
+}
diff --git a/webui/src/tests/thread-shell.test.tsx b/webui/src/tests/thread-shell.test.tsx
index 9e8a59f2d..4d767e227 100644
--- a/webui/src/tests/thread-shell.test.tsx
+++ b/webui/src/tests/thread-shell.test.tsx
@@ -3,8 +3,9 @@ import type { ReactNode } from "react";
 import { beforeEach, describe, expect, it, vi } from "vitest";
 
 import { ThreadShell } from "@/components/thread/ThreadShell";
+import { CLI_APPS_CHANGED_EVENT } from "@/lib/cli-app-events";
 import { ClientProvider } from "@/providers/ClientProvider";
-import type { UIMessage } from "@/lib/types";
+import type { CliAppsPayload, UIMessage } from "@/lib/types";
 function makeClient() {
   const errorHandlers = new Set<(err: { kind: string }) => void>();
   const chatHandlers = new Map<string, Set<(ev: import("@/lib/types").InboundEvent) => void>>();
@@ -994,4 +995,50 @@ describe("ThreadShell", () => {
     await waitFor(() => expect(screen.getByText("from chat b")).toBeInTheDocument());
     expect(screen.queryByText("from chat a")).not.toBeInTheDocument();
   });
+
+  it("updates @ CLI app suggestions when settings broadcasts an install", async () => {
+    const client = makeClient();
+    render(wrap(
+      client,
+      <ThreadShell
+        session={session("chat-cli-apps")}
+        title="Chat chat-cli-apps"
+        onToggleSidebar={() => {}}
+        onGoHome={() => {}}
+        onNewChat={() => {}}
+      />,
+    ));
+
+    const input = await screen.findByLabelText("Message input");
+    expect(screen.queryByRole("listbox", { name: "CLI Apps" })).not.toBeInTheDocument();
+
+    const payload: CliAppsPayload = {
+      apps: [{
+        name: "gimp",
+        display_name: "GIMP",
+        category: "image",
+        description: "Image editing",
+        requires: "",
+        source: "harness",
+        entry_point: "cli-anything-gimp",
+        install_supported: true,
+        installed: true,
+        available: true,
+        status: "installed",
+        logo_url: null,
+        brand_color: "#5C5543",
+        skill_installed: true,
+      }],
+      installed_count: 1,
+      catalog_updated_at: "2026-04-18",
+    };
+
+    await act(async () => {
+      window.dispatchEvent(new CustomEvent(CLI_APPS_CHANGED_EVENT, { detail: payload }));
+    });
+    fireEvent.change(input, { target: { value: "@", selectionStart: 1 } });
+
+    expect(screen.getByRole("listbox", { name: "CLI Apps" })).toBeInTheDocument();
+    expect(screen.getByRole("option", { name: /@gimp/i })).toBeInTheDocument();
+  });
 });