diff --git a/client/js/app.js b/client/js/app.js
index 894b3eb..f147e77 100644
--- a/client/js/app.js
+++ b/client/js/app.js
@@ -301,6 +301,19 @@
       setInputEnabled(true);
       break;
 
+    case 'profile_switched': {
+      // Update local session record so sidebar and header stay in sync.
+      const idx = sessions.findIndex(s => s.session_id === currentId);
+      if (idx !== -1) {
+        sessions[idx].profile_id   = event.profile_id;
+        sessions[idx].profile_name = event.profile_name;
+      }
+      profileSelect.value = event.profile_id;
+      updateChatHeader(chatHeaderEl, event.profile_id, event.profile_name);
+      rerenderSidebar();
+      break;
+    }
+
     case 'context_compressed':
       appendCompressionNotice(messagesEl);
       scrollToBottom(messagesEl);
diff --git a/navi/api/websocket.py b/navi/api/websocket.py
index 62bf39d..dd61975 100644
--- a/navi/api/websocket.py
+++ b/navi/api/websocket.py
@@ -25,7 +25,7 @@
 
 from navi.api.deps import get_session_store
 from navi.core import Agent, ContextCompressed, StreamEnd, TextDelta, ThinkingDelta, ThinkingEnd, ToolEvent
-from navi.core.events import ToolStarted, TurnThinking
+from navi.core.events import ProfileSwitched, ToolStarted, TurnThinking
 from navi.exceptions import MaxIterationsReached, NaviError, SessionNotFound
 
 router = APIRouter(tags=["websocket"])
@@ -100,6 +100,8 @@
         }
     if isinstance(event, TurnThinking):
         return {"type": "turn_thinking", "thinking": event.thinking, "is_subagent": event.is_subagent}
+    if isinstance(event, ProfileSwitched):
+        return {"type": "profile_switched", "profile_id": event.profile_id, "profile_name": event.profile_name}
     return None
 
 
diff --git a/navi/core/events.py b/navi/core/events.py
index fd12a45..15081ca 100644
--- a/navi/core/events.py
+++ b/navi/core/events.py
@@ -60,6 +60,14 @@
 
 
 @dataclass
+class ProfileSwitched:
+    """Emitted by switch_profile tool when it successfully changes the session profile."""
+
+    profile_id: str
+    profile_name: str
+
+
+@dataclass
 class TurnThinking:
     """Full thinking/reasoning block from a tool-calling turn (complete() response).
 
@@ -74,5 +82,5 @@
 
 AgentEvent = (
     ToolStarted | ToolEvent | TextDelta | ThinkingDelta | ThinkingEnd
-    | StreamEnd | ContextCompressed | TurnThinking
+    | StreamEnd | ContextCompressed | TurnThinking | ProfileSwitched
 )
diff --git a/navi/tools/switch_profile.py b/navi/tools/switch_profile.py
index 6add542..78b4c4e 100644
--- a/navi/tools/switch_profile.py
+++ b/navi/tools/switch_profile.py
@@ -1,6 +1,7 @@
 """Built-in tool for switching the active agent profile mid-session."""
 
-from navi.tools.base import Tool, ToolResult, current_session_id
+from navi.core.events import ProfileSwitched
+from navi.tools.base import Tool, ToolResult, current_event_sink, current_session_id
 
 
 class SwitchProfileTool(Tool):
@@ -56,6 +57,11 @@
         session.profile_id = profile_id
         await self._sessions.save(session)
 
+        # Notify the client immediately so it can update the UI.
+        sink = current_event_sink.get()
+        if sink is not None:
+            await sink.put(ProfileSwitched(profile_id=profile_id, profile_name=profile.name))
+
         return ToolResult(
             success=True,
             output=(