diff --git a/ui-electrobun/src/mainview/agent-store.svelte.ts b/ui-electrobun/src/mainview/agent-store.svelte.ts
index 9f0df80..6d6cdea 100644
--- a/ui-electrobun/src/mainview/agent-store.svelte.ts
+++ b/ui-electrobun/src/mainview/agent-store.svelte.ts
@@ -196,6 +196,15 @@ function ensureListeners() {
   listenersRegistered = true;
   console.log('[agent-store] Registering RPC listeners');
 
+  // DEBUG: Test if addMessageListener actually works
+  console.log('[agent-store] typeof addMessageListener:', typeof appRpc.addMessageListener);
+  appRpc.addMessageListener('agent.status', (payload: unknown) => {
+    console.log('[agent-store] *** RECEIVED agent.status ***', payload);
+  });
+  appRpc.addMessageListener('agent.cost', (payload: unknown) => {
+    console.log('[agent-store] *** RECEIVED agent.cost ***', payload);
+  });
+
   // agent.message — raw messages from sidecar, converted to display format
   appRpc.addMessageListener('agent.message', (payload: {
     sessionId: string;
@@ -207,8 +216,12 @@ function ensureListeners() {
       timestamp: number;
     }>;
   }) => {
+    console.log('[agent-store] *** RECEIVED agent.message ***', payload.sessionId, payload.messages?.length, 'msgs');
     const session = sessions[payload.sessionId];
-    if (!session) return;
+    if (!session) {
+      console.warn('[agent-store] No session found for', payload.sessionId);
+      return;
+    }
 
     const converted: AgentMessage[] = [];
     for (const raw of payload.messages) {