diff --git a/desktop/src-tauri/src/agent_activity_window.rs b/desktop/src-tauri/src/agent_activity_window.rs
new file mode 100644
index 0000000000..234c52db93
--- /dev/null
+++ b/desktop/src-tauri/src/agent_activity_window.rs
@@ -0,0 +1,79 @@
+//! Native companion-window lifecycle for an agent activity feed.
+
+use tauri::{Manager, WebviewUrl, WebviewWindowBuilder};
+use uuid::Uuid;
+
+const PUBKEY_HEX_LENGTH: usize = 64;
+
+fn normalized_pubkey(pubkey: &str) -> Result<String, String> {
+    let normalized = pubkey.trim().to_ascii_lowercase();
+    if normalized.len() != PUBKEY_HEX_LENGTH
+        || !normalized.bytes().all(|byte| byte.is_ascii_hexdigit())
+    {
+        return Err("agent pubkey must be 64 hexadecimal characters".to_string());
+    }
+    Ok(normalized)
+}
+
+fn window_label(channel_id: &Uuid, pubkey: &str) -> String {
+    format!("agent-activity-{pubkey}-{channel_id}")
+}
+
+/// Open an agent's channel-scoped activity feed without replacing the main
+/// window's thread panel. Each agent/channel pair owns one reusable window.
+#[tauri::command]
+pub fn open_agent_activity_window(
+    app: tauri::AppHandle,
+    channel_id: String,
+    pubkey: String,
+) -> Result<bool, String> {
+    let channel_id =
+        Uuid::parse_str(channel_id.trim()).map_err(|_| "channel id must be a UUID".to_string())?;
+    let pubkey = normalized_pubkey(&pubkey)?;
+    let label = window_label(&channel_id, &pubkey);
+
+    if let Some(window) = app.get_webview_window(&label) {
+        window.show().map_err(|error| error.to_string())?;
+        window.set_focus().map_err(|error| error.to_string())?;
+        return Ok(true);
+    }
+
+    let route = format!("index.html#/channels/{channel_id}?agentSession={pubkey}");
+    WebviewWindowBuilder::new(&app, label, WebviewUrl::App(route.into()))
+        .title("Agent activity")
+        .inner_size(560.0, 760.0)
+        .min_inner_size(420.0, 520.0)
+        .build()
+        .map_err(|error| error.to_string())?;
+    Ok(true)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{normalized_pubkey, window_label};
+    use uuid::Uuid;
+
+    #[test]
+    fn normalizes_valid_pubkeys() {
+        let uppercase = "AB".repeat(32);
+        assert_eq!(normalized_pubkey(&uppercase), Ok("ab".repeat(32)));
+    }
+
+    #[test]
+    fn labels_distinguish_pubkeys_with_the_same_prefix() {
+        let channel_id = Uuid::nil();
+        let first = format!("{}{}", "ab".repeat(6), "cd".repeat(26));
+        let second = format!("{}{}", "ab".repeat(6), "ef".repeat(26));
+
+        assert_ne!(
+            window_label(&channel_id, &first),
+            window_label(&channel_id, &second)
+        );
+    }
+
+    #[test]
+    fn rejects_invalid_pubkeys() {
+        assert!(normalized_pubkey("abc").is_err());
+        assert!(normalized_pubkey(&"zz".repeat(32)).is_err());
+    }
+}
diff --git a/desktop/src-tauri/src/lib.rs b/desktop/src-tauri/src/lib.rs
index 71a5eb3806..160083adf1 100644
--- a/desktop/src-tauri/src/lib.rs
+++ b/desktop/src-tauri/src/lib.rs
@@ -1,4 +1,5 @@
 #![recursion_limit = "256"] // Deep Tauri command futures exceed the default layout query depth.
+mod agent_activity_window;
 mod app_menu;
 mod app_state;
 mod archive;
@@ -50,6 +51,7 @@ mod unread_catch_up;
 mod util;
 #[cfg(target_os = "linux")]
 pub mod webkit_rendering;
+use agent_activity_window::open_agent_activity_window;
 use app_state::{build_app_state, resolve_persisted_identity, AppState};
 use builderlab::*;
 #[doc(hidden)]
@@ -781,6 +783,7 @@ pub fn run() {
             get_huddle_state,
             close_huddle_companion,
             open_huddle_window,
+            open_agent_activity_window,
             push_audio_pcm,
             reconnect_huddle_audio,
             start_stt_pipeline,
diff --git a/desktop/src/app/AppHuddleShell.tsx b/desktop/src/app/AppHuddleShell.tsx
index 3e32697e9e..a28b1d4195 100644
--- a/desktop/src/app/AppHuddleShell.tsx
+++ b/desktop/src/app/AppHuddleShell.tsx
@@ -12,6 +12,7 @@ type AppHuddleShellProps = {
   isCompanionOpen: boolean;
   isDrawerOpen: boolean;
   isRoom: boolean;
+  isPassiveWindow?: boolean;
   onCompanionOpen: () => void;
   onHuddleStartPendingChange: (pending: boolean) => void;
   onHuddleStarted: (ephemeralChannelId: string) => void | Promise<void>;
@@ -48,6 +49,7 @@ export function AppHuddleShell({
   isCompanionOpen,
   isDrawerOpen,
   isRoom,
+  isPassiveWindow = false,
   onCompanionOpen,
   onHuddleStartPendingChange,
   onHuddleStarted,
@@ -57,7 +59,7 @@ export function AppHuddleShell({
 }: AppHuddleShellProps) {
   return (
     <HuddleProvider
-      ownsAudioSession={!isRoom}
+      ownsAudioSession={!isRoom && !isPassiveWindow}
       onHuddleStartPendingChange={
         isRoom ? undefined : onHuddleStartPendingChange
       }
@@ -91,7 +93,7 @@ export function AppHuddleShell({
               <BuzzTheme.GradientLayer />
               {children}
             </div>
-            {isRoom || !isCompanionOpen ? (
+            {!isPassiveWindow && (isRoom || !isCompanionOpen) ? (
               <div className="buzz-huddle-drawer-slot absolute inset-x-0 bottom-0 z-[2] h-(--buzz-huddle-drawer-height)">
                 <AppHuddleBar
                   mode={isRoom ? "room" : "main"}
diff --git a/desktop/src/app/AppShell.tsx b/desktop/src/app/AppShell.tsx
index e111f93ca0..db1d24879a 100644
--- a/desktop/src/app/AppShell.tsx
+++ b/desktop/src/app/AppShell.tsx
@@ -44,6 +44,7 @@ import {
 } from "@/features/notifications/hooks";
 import { PreventSleepProvider } from "@/features/agents/usePreventSleep";
 import { requestOpenCreateAgent } from "@/features/agents/openCreateAgentEvent";
+import { isAgentActivityWindow } from "@/features/agents/lib/agentActivityWindow";
 import { useAgentsDataRefresh } from "@/features/agents/lib/useAgentsDataRefresh";
 import { useManagedAgentRuntimeReconciliation } from "@/features/agents/useManagedAgentRuntimeReconciliation";
 import { useAutoRestartPolicy } from "@/features/agents/lib/useAutoRestartPolicy";
@@ -125,7 +126,10 @@ export function AppShell() {
     showHuddleInMainApp,
     viewHuddleChannel,
   } = useHuddlePresentation();
-  const hasCommunityRail = communitiesHook.communities.length > 1;
+  const isActivityWindow = isAgentActivityWindow();
+  const isCompanionWindow = isHuddleRoom || isActivityWindow;
+  const hasCommunityRail =
+    communitiesHook.communities.length > 1 && !isCompanionWindow;
   const addCommunityDialog = useAddCommunityDialogState();
   const [isChannelManagementOpen, setIsChannelManagementOpen] =
     React.useState(false);
@@ -691,7 +695,7 @@ export function AppShell() {
   });
   return (
     <PreventSleepProvider>
-      {!isHuddleRoom ? (
+      {!isCompanionWindow ? (
         <AppShellTrayMenu
           channels={channels}
           goChannel={goChannel}
@@ -743,6 +747,7 @@ export function AppShell() {
             isCompanionOpen={isHuddleCompanionOpen}
             isDrawerOpen={isHuddleDrawerOpen}
             isRoom={isHuddleRoom}
+            isPassiveWindow={isActivityWindow}
             onCompanionOpen={handleHuddleCompanionOpen}
             onHuddleStartPendingChange={handleHuddleStartPendingChange}
             onHuddleStarted={handleHuddleStarted}
@@ -750,7 +755,7 @@ export function AppShell() {
             onViewHuddleChannel={viewHuddleChannel}
             onVisibilityChange={handleHuddleVisibilityChange}
           >
-            {hasCommunityRail && !isHuddleRoom ? (
+            {hasCommunityRail ? (
               <CommunityRail
                 activeCommunityId={communitiesHook.activeCommunity?.id ?? null}
                 onAddCommunity={addCommunityDialog.openDialog}
@@ -766,7 +771,7 @@ export function AppShell() {
             >
               <AppProfilePanelProvider>
                 <AppWorkflowEditorOverlayProvider>
-                  {!settingsOpen && !isHuddleRoom ? (
+                  {!settingsOpen && !isCompanionWindow ? (
                     <AppTopChrome
                       canGoBack={canGoBack}
                       canGoForward={canGoForward}
@@ -817,7 +822,7 @@ export function AppShell() {
                     </div>
                   ) : (
                     <div className="relative flex min-h-0 flex-1 overflow-visible">
-                      {!isHuddleRoom ? (
+                      {!isCompanionWindow ? (
                         <AppSidebar
                           activeCommunity={communitiesHook.activeCommunity}
                           channels={sidebarChannels}
@@ -935,7 +940,7 @@ export function AppShell() {
                           <Outlet />
                         </AppShellChannelSurface>
                       </TerminalContextOverrideProvider>
-                      {!isHuddleRoom ? (
+                      {!isCompanionWindow ? (
                         <RelayConnectionOverlay
                           card={relayConnectionCard}
                           errorMessage={channelsErrorMessage}
diff --git a/desktop/src/features/agents/lib/agentActivityWindow.ts b/desktop/src/features/agents/lib/agentActivityWindow.ts
new file mode 100644
index 0000000000..a4520828de
--- /dev/null
+++ b/desktop/src/features/agents/lib/agentActivityWindow.ts
@@ -0,0 +1,17 @@
+import { isTauri } from "@tauri-apps/api/core";
+import { getCurrentWindow } from "@tauri-apps/api/window";
+
+const AGENT_ACTIVITY_WINDOW_LABEL_PREFIX = "agent-activity-";
+
+/** Whether this webview is dedicated to an agent activity feed. */
+export function isAgentActivityWindow(): boolean {
+  if (!isTauri()) return false;
+
+  try {
+    return getCurrentWindow().label.startsWith(
+      AGENT_ACTIVITY_WINDOW_LABEL_PREFIX,
+    );
+  } catch {
+    return false;
+  }
+}
diff --git a/desktop/src/features/agents/useOpenAgentActivity.ts b/desktop/src/features/agents/useOpenAgentActivity.ts
index 4be71953b1..a26bb8db85 100644
--- a/desktop/src/features/agents/useOpenAgentActivity.ts
+++ b/desktop/src/features/agents/useOpenAgentActivity.ts
@@ -5,6 +5,7 @@ import { useAppNavigation } from "@/app/navigation/useAppNavigation";
 import { useChannelReferences } from "@/features/channels/openChannelDirectory";
 import { useAgentSession } from "@/shared/context/AgentSessionContext";
 import type { Channel } from "@/shared/api/types";
+import { openAgentActivityWindow } from "@/shared/api/agentActivityWindow";
 import { normalizePubkey } from "@/shared/lib/pubkey";
 import { getAgentWorkingState } from "./agentWorkingSignal";
 import { useRelayAgentsQuery } from "./hooks";
@@ -54,23 +55,11 @@ export function resolveOpenableActivityChannelId({
 }
 
 /**
- * Universal ingress for opening an agent's activity pane.
+ * Universal ingress for opening an agent's activity feed.
  *
- * Inside a channel screen the AgentSessionContext handler opens the pane in
- * place. Everywhere else (agents page, home profile panel, popovers reached
- * from non-channel routes) there is no provider, so we navigate to a channel
- * with the `agentSession` search param instead — preferring a channel the
- * agent is currently working in (unified working signal), then falling back
- * to the first channel the agent is a member of.
- *
- * Navigation only ever targets channels the viewer can actually open
- * (joined, or open visibility). Owner-global ingestion means the working
- * signal can report activity in rooms the viewer can't access; deep-linking
- * there would land on a screen they can't read. In that case we surface a
- * safe warning instead of navigating — no channel content, no trap-door.
- *
- * This replaces the old behavior where "View activity log" silently
- * disappeared on routes without an AgentSessionProvider.
+ * The selected channel is still resolved and authorized in the current
+ * webview, but Tauri presents the existing channel-scoped feed in a dedicated
+ * companion window. Browser builds keep the previous in-app route fallback.
  */
 export function useOpenAgentActivity() {
   const { onOpenAgentSession } = useAgentSession();
@@ -149,6 +138,22 @@ export function useOpenAgentActivity() {
     [areChannelsReady, onOpenAgentSession, resolveChannelId],
   );
 
+  const openActivityDestination = React.useCallback(
+    (pubkey: string, channelId: string): void => {
+      void openAgentActivityWindow(channelId, pubkey)
+        .then((openedNativeWindow) => {
+          if (!openedNativeWindow) {
+            void goChannel(channelId, { agentSession: pubkey });
+          }
+        })
+        .catch((error) => {
+          console.error("Failed to open agent activity window:", error);
+          toast.error("Couldn't open the agent activity window.");
+        });
+    },
+    [goChannel],
+  );
+
   const openAgentActivity = React.useCallback(
     (pubkey: string, options?: { channelId?: string | null }): boolean => {
       // An explicit channel target (e.g. clicking a "Working in #channel"
@@ -162,22 +167,18 @@ export function useOpenAgentActivity() {
             toast.warning(INACCESSIBLE_ACTIVITY_MESSAGE);
             return false;
           }
-          void goChannel(options.channelId, { agentSession: pubkey });
+          openActivityDestination(pubkey, options.channelId);
           return true;
         }
         // A channel-scoped AgentSessionProvider belongs to the channel view
         // already authorized by its route. Do not reject its own current
         // channel while the member/reference query is still settling.
-        onOpenAgentSession(pubkey, options.channelId);
-        return true;
-      }
-      if (onOpenAgentSession) {
-        onOpenAgentSession(pubkey);
+        openActivityDestination(pubkey, options.channelId);
         return true;
       }
       const channelId = resolveChannelId(pubkey);
       if (channelId) {
-        void goChannel(channelId, { agentSession: pubkey });
+        openActivityDestination(pubkey, channelId);
         return true;
       }
       // The agent may be working somewhere, just nowhere the viewer can open.
@@ -188,7 +189,12 @@ export function useOpenAgentActivity() {
       }
       return false;
     },
-    [findOpenableChannel, goChannel, onOpenAgentSession, resolveChannelId],
+    [
+      findOpenableChannel,
+      onOpenAgentSession,
+      openActivityDestination,
+      resolveChannelId,
+    ],
   );
 
   return { canOpenAgentActivity, openAgentActivity };
diff --git a/desktop/src/features/channels/ui/ChannelScreen.tsx b/desktop/src/features/channels/ui/ChannelScreen.tsx
index 6254afd8c7..2e0501d3b0 100644
--- a/desktop/src/features/channels/ui/ChannelScreen.tsx
+++ b/desktop/src/features/channels/ui/ChannelScreen.tsx
@@ -1,4 +1,5 @@
 import * as React from "react";
+import { toast } from "sonner";
 import { useAppShell } from "@/app/AppShellContext";
 import { useAppNavigation } from "@/app/navigation/useAppNavigation";
 import { useActiveChannelHeader } from "@/features/channels/useActiveChannelHeader";
@@ -57,6 +58,8 @@ import type { TimelineMessage } from "@/features/messages/types";
 import { useUsersBatchQuery } from "@/features/profile/hooks";
 import { useRelaySelfQuery } from "@/features/moderation/hooks";
 import type { RelayEvent, RespondToMode } from "@/shared/api/types";
+import { openAgentActivityWindow } from "@/shared/api/agentActivityWindow";
+import { isAgentActivityWindow } from "@/features/agents/lib/agentActivityWindow";
 import { ChannelScreenLoadingFallback } from "@/features/channels/ui/ChannelScreenLoadingFallback";
 import {
   useHuddleChannelMessages,
@@ -583,6 +586,29 @@ export function ChannelScreen({
     setThreadReplyTargetId,
     setThreadScrollTargetId,
   });
+  const handleOpenAgentActivity = React.useCallback(
+    (pubkey: string, channelId?: string | null) => {
+      const destinationChannelId = channelId ?? activeChannelId;
+      if (!destinationChannelId) return;
+
+      if (isAgentActivityWindow()) {
+        handleOpenAgentSession(pubkey, destinationChannelId);
+        return;
+      }
+
+      void openAgentActivityWindow(destinationChannelId, pubkey)
+        .then((openedNativeWindow) => {
+          if (!openedNativeWindow) {
+            handleOpenAgentSession(pubkey, destinationChannelId);
+          }
+        })
+        .catch((error) => {
+          console.error("Failed to open agent activity window:", error);
+          toast.error("Couldn't open the agent activity window.");
+        });
+    },
+    [activeChannelId, handleOpenAgentSession],
+  );
   const { handleOpenProfilePanel, handleCloseProfilePanel, handleOpenDm } =
     useChannelProfilePanel({
       closeAgentSession: handleCloseAgentSession,
@@ -772,7 +798,7 @@ export function ChannelScreen({
     ],
   );
   return (
-    <AgentSessionProvider onOpenAgentSession={handleOpenAgentSession}>
+    <AgentSessionProvider onOpenAgentSession={handleOpenAgentActivity}>
       <ProfilePanelProvider onOpenProfilePanel={handleOpenProfilePanel}>
         <WelcomeAgentCreateDialog
           guideName={welcomeGuideAgent?.name ?? "your welcome guide"}
@@ -911,7 +937,7 @@ export function ChannelScreen({
                   onMarkUnread={handleMessageMarkUnread}
                   onMarkRead={handleMessageMarkRead}
                   onExpandThreadReplies={handleExpandThreadReplies}
-                  onOpenAgentSession={handleOpenAgentSession}
+                  onOpenAgentSession={handleOpenAgentActivity}
                   onOpenDm={handleOpenDm}
                   onOpenProfilePanel={handleOpenProfilePanel}
                   onResetThreadPanelWidth={handleThreadPanelWidthReset}
@@ -969,7 +995,7 @@ export function ChannelScreen({
           currentPubkey={currentPubkey}
           open={isMembersSidebarOpen}
           onOpenChange={setIsMembersSidebarOpen}
-          onViewActivity={handleOpenAgentSession}
+          onViewActivity={handleOpenAgentActivity}
           relayUrl={activeCommunity?.relayUrl}
         />
       </ProfilePanelProvider>
diff --git a/desktop/src/main.tsx b/desktop/src/main.tsx
index 634a9b171a..777861fa39 100644
--- a/desktop/src/main.tsx
+++ b/desktop/src/main.tsx
@@ -12,6 +12,7 @@ import { UpdaterProvider } from "@/features/settings/hooks/UpdaterProvider";
 import { migrateLegacyCommunityStorageBeforeRender } from "@/features/communities/legacyCommunityStorage";
 import { CommunitiesProvider } from "@/features/communities/useCommunities";
 import { huddleWindowChannelId } from "@/features/huddle/lib/huddleWindow";
+import { isAgentActivityWindow } from "@/features/agents/lib/agentActivityWindow";
 import { CommunityOnboardingProvider } from "@/features/onboarding/communityOnboarding";
 import { ThemeProvider } from "@/shared/theme/ThemeProvider";
 import { EmojiBurstProvider } from "@/shared/ui/EmojiBurstProvider";
@@ -86,7 +87,9 @@ function renderApp() {
       <RootErrorBoundary>
         <CommunitiesProvider>
           <CommunityOnboardingProvider
-            enabled={huddleWindowChannelId() === null}
+            enabled={
+              huddleWindowChannelId() === null && !isAgentActivityWindow()
+            }
           >
             <ThemeProvider defaultTheme="buzz">
               <TooltipProvider>
diff --git a/desktop/src/shared/api/agentActivityWindow.ts b/desktop/src/shared/api/agentActivityWindow.ts
new file mode 100644
index 0000000000..d4e03b8202
--- /dev/null
+++ b/desktop/src/shared/api/agentActivityWindow.ts
@@ -0,0 +1,10 @@
+import { invoke, isTauri } from "@tauri-apps/api/core";
+
+/** Opens a channel-scoped agent activity feed in its native companion window. */
+export async function openAgentActivityWindow(
+  channelId: string,
+  pubkey: string,
+): Promise<boolean> {
+  if (!isTauri()) return false;
+  return invoke<boolean>("open_agent_activity_window", { channelId, pubkey });
+}
diff --git a/desktop/src/testing/e2eBridge.ts b/desktop/src/testing/e2eBridge.ts
index e4028f0171..8bebac4318 100644
--- a/desktop/src/testing/e2eBridge.ts
+++ b/desktop/src/testing/e2eBridge.ts
@@ -11238,6 +11238,10 @@ export function maybeInstallE2eTauriMocks() {
           await emitMockHuddleState();
         }
         return null;
+      case "open_agent_activity_window":
+        // Browser E2E keeps the in-app fallback so existing interaction specs
+        // can inspect the feed without a second native webview.
+        return false;
       case "open_huddle_window":
         if ((activeConfig?.mock?.openHuddleWindowDelayMs ?? 0) > 0) {
           await new Promise((resolve) =>