diff --git a/packages/dashboard/src/__tests__/chat-manager-room-hybrid.test.ts b/packages/dashboard/src/__tests__/chat-manager-room-hybrid.test.ts
index 5eac88b6d..341b88db1 100644
--- a/packages/dashboard/src/__tests__/chat-manager-room-hybrid.test.ts
+++ b/packages/dashboard/src/__tests__/chat-manager-room-hybrid.test.ts
@@ -5,6 +5,7 @@ const mockChatStore = {
   listRoomMembers: vi.fn(),
   createSession: vi.fn(),
   getRoom: vi.fn(),
+  getRoomMessages: vi.fn(),
   addRoomMessage: vi.fn(),
 };
 
@@ -18,6 +19,7 @@ describe("ChatManager room hybrid responder resolution", () => {
     vi.clearAllMocks();
     __resetChatState();
     mockChatStore.getRoom.mockReturnValue({ id: "room-1", name: "room-1" });
+    mockChatStore.getRoomMessages.mockReturnValue([]);
     mockChatStore.addRoomMessage.mockImplementation((_roomId: string, input: any) => ({
       id: `msg-${mockChatStore.addRoomMessage.mock.calls.length}`,
       roomId: "room-1",
diff --git a/packages/dashboard/src/__tests__/chat-manager.test.ts b/packages/dashboard/src/__tests__/chat-manager.test.ts
index f30bf2333..80e72fad9 100644
--- a/packages/dashboard/src/__tests__/chat-manager.test.ts
+++ b/packages/dashboard/src/__tests__/chat-manager.test.ts
@@ -1158,7 +1158,7 @@ describe("ChatManager.sendMessage", () => {
     expect(mockAgentStore.getAgent).toHaveBeenCalledWith("agent-001");
     expect(createOptions.systemPrompt).toContain("Be calm and precise.");
     expect(createOptions.systemPrompt).toContain("Your chat reply is the primary response to the user.");
-    expect(createOptions.systemPrompt).toContain("Only use `fn_send_message` when the user explicitly asks");
+    expect(createOptions.systemPrompt).toContain("Use `fn_send_message` only when either (a) the user explicitly asks");
   });
 
   it("includes guidance to avoid double-sending mailbox copies by default", async () => {
@@ -1180,7 +1180,7 @@ describe("ChatManager.sendMessage", () => {
     await chatManager.sendMessage("chat-001", "Hello");
 
     expect(createOptions.systemPrompt).toContain("Do not also call `fn_send_message` with the same content");
-    expect(createOptions.systemPrompt).toContain("Only use `fn_send_message` when the user explicitly asks for mailbox/inbox/notification delivery");
+    expect(createOptions.systemPrompt).toContain("Use `fn_send_message` only when either (a) the user explicitly asks for mailbox/inbox/notification delivery");
   });
 
   it("passes enriched system prompt with agent memory when agent context is available", async () => {