diff --git a/frontend/__tests__/api/file-service/file-service.api.test.ts b/frontend/__tests__/api/file-service/file-service.api.test.ts
deleted file mode 100644
index dce183a21d..0000000000
--- a/frontend/__tests__/api/file-service/file-service.api.test.ts
+++ /dev/null
@@ -1,29 +0,0 @@
-import { describe, expect, it } from "vitest";
-import ConversationService from "#/api/conversation-service/conversation-service.api";
-import {
-  FILE_VARIANTS_1,
-  FILE_VARIANTS_2,
-} from "#/mocks/file-service-handlers";
-
-/**
- * File service API tests. The actual API calls are mocked using MSW.
- * You can find the mock handlers in `frontend/src/mocks/file-service-handlers.ts`.
- */
-
-describe("ConversationService File API", () => {
-  it("should get a list of files", async () => {
-    await expect(
-      ConversationService.getFiles("test-conversation-id"),
-    ).resolves.toEqual(FILE_VARIANTS_1);
-
-    await expect(
-      ConversationService.getFiles("test-conversation-id-2"),
-    ).resolves.toEqual(FILE_VARIANTS_2);
-  });
-
-  it("should get content of a file", async () => {
-    await expect(
-      ConversationService.getFile("test-conversation-id", "file1.txt"),
-    ).resolves.toEqual("Content of file1.txt");
-  });
-});
diff --git a/frontend/__tests__/build-websocket-url.test.ts b/frontend/__tests__/build-websocket-url.test.ts
new file mode 100644
index 0000000000..da20565afc
--- /dev/null
+++ b/frontend/__tests__/build-websocket-url.test.ts
@@ -0,0 +1,187 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
+import { buildWebSocketUrl } from "#/utils/websocket-url";
+
+describe("buildWebSocketUrl", () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  describe("Basic URL construction", () => {
+    it("should build WebSocket URL with conversation ID and URL", () => {
+      vi.stubGlobal("location", {
+        protocol: "http:",
+        host: "localhost:3000",
+      });
+
+      const result = buildWebSocketUrl(
+        "conv-123",
+        "http://localhost:8080/api/conversations/conv-123",
+      );
+
+      expect(result).toBe("ws://localhost:8080/sockets/events/conv-123");
+    });
+
+    it("should use wss:// protocol when window.location.protocol is https:", () => {
+      vi.stubGlobal("location", {
+        protocol: "https:",
+        host: "localhost:3000",
+      });
+
+      const result = buildWebSocketUrl(
+        "conv-123",
+        "https://example.com:8080/api/conversations/conv-123",
+      );
+
+      expect(result).toBe("wss://example.com:8080/sockets/events/conv-123");
+    });
+
+    it("should extract host and port from conversation URL", () => {
+      vi.stubGlobal("location", {
+        protocol: "http:",
+        host: "localhost:3000",
+      });
+
+      const result = buildWebSocketUrl(
+        "conv-456",
+        "http://agent-server.com:9000/api/conversations/conv-456",
+      );
+
+      expect(result).toBe("ws://agent-server.com:9000/sockets/events/conv-456");
+    });
+  });
+
+  describe("Query parameters handling", () => {
+    beforeEach(() => {
+      vi.stubGlobal("location", {
+        protocol: "http:",
+        host: "localhost:3000",
+      });
+    });
+
+    it("should not include query parameters in the URL (handled by useWebSocket hook)", () => {
+      const result = buildWebSocketUrl(
+        "conv-123",
+        "http://localhost:8080/api/conversations/conv-123",
+      );
+
+      expect(result).toBe("ws://localhost:8080/sockets/events/conv-123");
+      expect(result).not.toContain("?");
+      expect(result).not.toContain("session_api_key");
+    });
+  });
+
+  describe("Fallback to window.location.host", () => {
+    it("should use window.location.host when conversation URL is null", () => {
+      vi.stubGlobal("location", {
+        protocol: "http:",
+        host: "fallback-host:4000",
+      });
+
+      const result = buildWebSocketUrl("conv-123", null);
+
+      expect(result).toBe("ws://fallback-host:4000/sockets/events/conv-123");
+    });
+
+    it("should use window.location.host when conversation URL is undefined", () => {
+      vi.stubGlobal("location", {
+        protocol: "http:",
+        host: "fallback-host:4000",
+      });
+
+      const result = buildWebSocketUrl("conv-123", undefined);
+
+      expect(result).toBe("ws://fallback-host:4000/sockets/events/conv-123");
+    });
+
+    it("should use window.location.host when conversation URL is relative path", () => {
+      vi.stubGlobal("location", {
+        protocol: "http:",
+        host: "fallback-host:4000",
+      });
+
+      const result = buildWebSocketUrl(
+        "conv-123",
+        "/api/conversations/conv-123",
+      );
+
+      expect(result).toBe("ws://fallback-host:4000/sockets/events/conv-123");
+    });
+
+    it("should use window.location.host when conversation URL is invalid", () => {
+      vi.stubGlobal("location", {
+        protocol: "http:",
+        host: "fallback-host:4000",
+      });
+
+      const result = buildWebSocketUrl("conv-123", "not-a-valid-url");
+
+      expect(result).toBe("ws://fallback-host:4000/sockets/events/conv-123");
+    });
+  });
+
+  describe("Edge cases", () => {
+    beforeEach(() => {
+      vi.stubGlobal("location", {
+        protocol: "http:",
+        host: "localhost:3000",
+      });
+    });
+
+    it("should return null when conversationId is undefined", () => {
+      const result = buildWebSocketUrl(
+        undefined,
+        "http://localhost:8080/api/conversations/conv-123",
+      );
+
+      expect(result).toBeNull();
+    });
+
+    it("should return null when conversationId is empty string", () => {
+      const result = buildWebSocketUrl(
+        "",
+        "http://localhost:8080/api/conversations/conv-123",
+      );
+
+      expect(result).toBeNull();
+    });
+
+    it("should handle conversation URLs with non-standard ports", () => {
+      const result = buildWebSocketUrl(
+        "conv-123",
+        "http://example.com:12345/api/conversations/conv-123",
+      );
+
+      expect(result).toBe("ws://example.com:12345/sockets/events/conv-123");
+    });
+
+    it("should handle conversation URLs without port (default port)", () => {
+      const result = buildWebSocketUrl(
+        "conv-123",
+        "http://example.com/api/conversations/conv-123",
+      );
+
+      expect(result).toBe("ws://example.com/sockets/events/conv-123");
+    });
+
+    it("should handle conversation IDs with special characters", () => {
+      const result = buildWebSocketUrl(
+        "conv-123-abc_def",
+        "http://localhost:8080/api/conversations/conv-123-abc_def",
+      );
+
+      expect(result).toBe(
+        "ws://localhost:8080/sockets/events/conv-123-abc_def",
+      );
+    });
+
+    it("should build URL without query parameters", () => {
+      const result = buildWebSocketUrl(
+        "conv-123",
+        "http://localhost:8080/api/conversations/conv-123",
+      );
+
+      expect(result).toBe("ws://localhost:8080/sockets/events/conv-123");
+      expect(result).not.toContain("?");
+    });
+  });
+});
diff --git a/frontend/__tests__/components/features/conversation-panel/conversation-panel.test.tsx b/frontend/__tests__/components/features/conversation-panel/conversation-panel.test.tsx
index 8250647169..9faef96ac5 100644
--- a/frontend/__tests__/components/features/conversation-panel/conversation-panel.test.tsx
+++ b/frontend/__tests__/components/features/conversation-panel/conversation-panel.test.tsx
@@ -8,6 +8,14 @@ import { ConversationPanel } from "#/components/features/conversation-panel/conv
 import ConversationService from "#/api/conversation-service/conversation-service.api";
 import { Conversation } from "#/api/open-hands.types";
 
+// Mock the unified stop conversation hook
+const mockStopConversationMutate = vi.fn();
+vi.mock("#/hooks/mutation/use-unified-stop-conversation", () => ({
+  useUnifiedPauseConversationSandbox: () => ({
+    mutate: mockStopConversationMutate,
+  }),
+}));
+
 describe("ConversationPanel", () => {
   const onCloseMock = vi.fn();
   const RouterStub = createRoutesStub([
@@ -73,7 +81,7 @@ describe("ConversationPanel", () => {
 
   beforeEach(() => {
     vi.clearAllMocks();
-    vi.restoreAllMocks();
+    mockStopConversationMutate.mockClear();
     // Setup default mock for getUserConversations
     vi.spyOn(ConversationService, "getUserConversations").mockResolvedValue({
       results: [...mockConversations],
@@ -430,19 +438,6 @@ describe("ConversationPanel", () => {
       next_page_id: null,
     }));
 
-    const stopConversationSpy = vi.spyOn(
-      ConversationService,
-      "stopConversation",
-    );
-    stopConversationSpy.mockImplementation(async (id: string) => {
-      const conversation = mockData.find((conv) => conv.conversation_id === id);
-      if (conversation) {
-        conversation.status = "STOPPED";
-        return conversation;
-      }
-      return null;
-    });
-
     renderConversationPanel();
 
     const cards = await screen.findAllByTestId("conversation-card");
@@ -465,9 +460,12 @@ describe("ConversationPanel", () => {
       screen.queryByRole("button", { name: /confirm/i }),
     ).not.toBeInTheDocument();
 
-    // Verify the API was called
-    expect(stopConversationSpy).toHaveBeenCalledWith("1");
-    expect(stopConversationSpy).toHaveBeenCalledTimes(1);
+    // Verify the mutation was called
+    expect(mockStopConversationMutate).toHaveBeenCalledWith({
+      conversationId: "1",
+      version: undefined,
+    });
+    expect(mockStopConversationMutate).toHaveBeenCalledTimes(1);
   });
 
   it("should only show stop button for STARTING or RUNNING conversations", async () => {
diff --git a/frontend/__tests__/components/features/conversation/server-status.test.tsx b/frontend/__tests__/components/features/conversation/server-status.test.tsx
index b8fc40369e..8780530d0e 100644
--- a/frontend/__tests__/components/features/conversation/server-status.test.tsx
+++ b/frontend/__tests__/components/features/conversation/server-status.test.tsx
@@ -6,25 +6,25 @@ import { ServerStatus } from "#/components/features/controls/server-status";
 import { ServerStatusContextMenu } from "#/components/features/controls/server-status-context-menu";
 import { ConversationStatus } from "#/types/conversation-status";
 import { AgentState } from "#/types/agent-state";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 
-// Mock the agent store
-vi.mock("#/stores/agent-store", () => ({
-  useAgentStore: vi.fn(),
+// Mock the agent state hook
+vi.mock("#/hooks/use-agent-state", () => ({
+  useAgentState: vi.fn(),
 }));
 
 // Mock the custom hooks
 const mockStartConversationMutate = vi.fn();
 const mockStopConversationMutate = vi.fn();
 
-vi.mock("#/hooks/mutation/use-start-conversation", () => ({
-  useStartConversation: () => ({
+vi.mock("#/hooks/mutation/use-unified-start-conversation", () => ({
+  useUnifiedStartConversation: () => ({
     mutate: mockStartConversationMutate,
   }),
 }));
 
-vi.mock("#/hooks/mutation/use-stop-conversation", () => ({
-  useStopConversation: () => ({
+vi.mock("#/hooks/mutation/use-unified-stop-conversation", () => ({
+  useUnifiedStopConversation: () => ({
     mutate: mockStopConversationMutate,
   }),
 }));
@@ -41,6 +41,19 @@ vi.mock("#/hooks/use-user-providers", () => ({
   }),
 }));
 
+vi.mock("#/hooks/query/use-task-polling", () => ({
+  useTaskPolling: () => ({
+    isTask: false,
+    taskId: null,
+    conversationId: "test-conversation-id",
+    task: null,
+    taskStatus: null,
+    taskDetail: null,
+    taskError: null,
+    isLoadingTask: false,
+  }),
+}));
+
 // Mock react-i18next
 vi.mock("react-i18next", async () => {
   const actual = await vi.importActual("react-i18next");
@@ -66,12 +79,14 @@ vi.mock("react-i18next", async () => {
 });
 
 describe("ServerStatus", () => {
-  // Helper function to mock agent store with specific state
+  // Mock functions for handlers
+  const mockHandleStop = vi.fn();
+  const mockHandleResumeAgent = vi.fn();
+
+  // Helper function to mock agent state with specific state
   const mockAgentStore = (agentState: AgentState) => {
-    vi.mocked(useAgentStore).mockReturnValue({
+    vi.mocked(useAgentState).mockReturnValue({
       curAgentState: agentState,
-      setCurrentAgentState: vi.fn(),
-      reset: vi.fn(),
     });
   };
 
@@ -85,20 +100,42 @@ describe("ServerStatus", () => {
 
     // Test RUNNING status
     const { rerender } = renderWithProviders(
-      <ServerStatus conversationStatus="RUNNING" />,
+      <ServerStatus
+        conversationStatus="RUNNING"
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
     );
     expect(screen.getByText("Running")).toBeInTheDocument();
 
     // Test STOPPED status
-    rerender(<ServerStatus conversationStatus="STOPPED" />);
+    rerender(
+      <ServerStatus
+        conversationStatus="STOPPED"
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
     expect(screen.getByText("Server Stopped")).toBeInTheDocument();
 
     // Test STARTING status (shows "Running" due to agent state being RUNNING)
-    rerender(<ServerStatus conversationStatus="STARTING" />);
+    rerender(
+      <ServerStatus
+        conversationStatus="STARTING"
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
     expect(screen.getByText("Running")).toBeInTheDocument();
 
     // Test null status (shows "Running" due to agent state being RUNNING)
-    rerender(<ServerStatus conversationStatus={null} />);
+    rerender(
+      <ServerStatus
+        conversationStatus={null}
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
     expect(screen.getByText("Running")).toBeInTheDocument();
   });
 
@@ -108,7 +145,13 @@ describe("ServerStatus", () => {
     // Mock agent store to return RUNNING state
     mockAgentStore(AgentState.RUNNING);
 
-    renderWithProviders(<ServerStatus conversationStatus="RUNNING" />);
+    renderWithProviders(
+      <ServerStatus
+        conversationStatus="RUNNING"
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
 
     const statusContainer = screen.getByText("Running").closest("div");
     expect(statusContainer).toBeInTheDocument();
@@ -128,7 +171,13 @@ describe("ServerStatus", () => {
     // Mock agent store to return STOPPED state
     mockAgentStore(AgentState.STOPPED);
 
-    renderWithProviders(<ServerStatus conversationStatus="STOPPED" />);
+    renderWithProviders(
+      <ServerStatus
+        conversationStatus="STOPPED"
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
 
     const statusContainer = screen.getByText("Server Stopped").closest("div");
     expect(statusContainer).toBeInTheDocument();
@@ -148,7 +197,13 @@ describe("ServerStatus", () => {
     // Mock agent store to return RUNNING state
     mockAgentStore(AgentState.RUNNING);
 
-    renderWithProviders(<ServerStatus conversationStatus="STARTING" />);
+    renderWithProviders(
+      <ServerStatus
+        conversationStatus="STARTING"
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
 
     const statusContainer = screen.getByText("Running").closest("div");
     expect(statusContainer).toBeInTheDocument();
@@ -165,12 +220,18 @@ describe("ServerStatus", () => {
     const user = userEvent.setup();
 
     // Clear previous calls
-    mockStopConversationMutate.mockClear();
+    mockHandleStop.mockClear();
 
     // Mock agent store to return RUNNING state
     mockAgentStore(AgentState.RUNNING);
 
-    renderWithProviders(<ServerStatus conversationStatus="RUNNING" />);
+    renderWithProviders(
+      <ServerStatus
+        conversationStatus="RUNNING"
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
 
     const statusContainer = screen.getByText("Running").closest("div");
     await user.click(statusContainer!);
@@ -178,21 +239,25 @@ describe("ServerStatus", () => {
     const stopButton = screen.getByTestId("stop-server-button");
     await user.click(stopButton);
 
-    expect(mockStopConversationMutate).toHaveBeenCalledWith({
-      conversationId: "test-conversation-id",
-    });
+    expect(mockHandleStop).toHaveBeenCalledTimes(1);
   });
 
   it("should call start conversation mutation when start server is clicked", async () => {
     const user = userEvent.setup();
 
     // Clear previous calls
-    mockStartConversationMutate.mockClear();
+    mockHandleResumeAgent.mockClear();
 
     // Mock agent store to return STOPPED state
     mockAgentStore(AgentState.STOPPED);
 
-    renderWithProviders(<ServerStatus conversationStatus="STOPPED" />);
+    renderWithProviders(
+      <ServerStatus
+        conversationStatus="STOPPED"
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
 
     const statusContainer = screen.getByText("Server Stopped").closest("div");
     await user.click(statusContainer!);
@@ -200,10 +265,7 @@ describe("ServerStatus", () => {
     const startButton = screen.getByTestId("start-server-button");
     await user.click(startButton);
 
-    expect(mockStartConversationMutate).toHaveBeenCalledWith({
-      conversationId: "test-conversation-id",
-      providers: [],
-    });
+    expect(mockHandleResumeAgent).toHaveBeenCalledTimes(1);
   });
 
   it("should close context menu after stop server action", async () => {
@@ -212,7 +274,13 @@ describe("ServerStatus", () => {
     // Mock agent store to return RUNNING state
     mockAgentStore(AgentState.RUNNING);
 
-    renderWithProviders(<ServerStatus conversationStatus="RUNNING" />);
+    renderWithProviders(
+      <ServerStatus
+        conversationStatus="RUNNING"
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
 
     const statusContainer = screen.getByText("Running").closest("div");
     await user.click(statusContainer!);
@@ -221,9 +289,7 @@ describe("ServerStatus", () => {
     await user.click(stopButton);
 
     // Context menu should be closed (handled by the component)
-    expect(mockStopConversationMutate).toHaveBeenCalledWith({
-      conversationId: "test-conversation-id",
-    });
+    expect(mockHandleStop).toHaveBeenCalledTimes(1);
   });
 
   it("should close context menu after start server action", async () => {
@@ -232,7 +298,13 @@ describe("ServerStatus", () => {
     // Mock agent store to return STOPPED state
     mockAgentStore(AgentState.STOPPED);
 
-    renderWithProviders(<ServerStatus conversationStatus="STOPPED" />);
+    renderWithProviders(
+      <ServerStatus
+        conversationStatus="STOPPED"
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
 
     const statusContainer = screen.getByText("Server Stopped").closest("div");
     await user.click(statusContainer!);
@@ -250,7 +322,13 @@ describe("ServerStatus", () => {
     // Mock agent store to return RUNNING state
     mockAgentStore(AgentState.RUNNING);
 
-    renderWithProviders(<ServerStatus conversationStatus={null} />);
+    renderWithProviders(
+      <ServerStatus
+        conversationStatus={null}
+        handleStop={mockHandleStop}
+        handleResumeAgent={mockHandleResumeAgent}
+      />,
+    );
 
     const statusText = screen.getByText("Running");
     expect(statusText).toBeInTheDocument();
diff --git a/frontend/__tests__/components/interactive-chat-box.test.tsx b/frontend/__tests__/components/interactive-chat-box.test.tsx
index f9c9e9a374..b518580650 100644
--- a/frontend/__tests__/components/interactive-chat-box.test.tsx
+++ b/frontend/__tests__/components/interactive-chat-box.test.tsx
@@ -5,12 +5,12 @@ import { MemoryRouter } from "react-router";
 import { InteractiveChatBox } from "#/components/features/chat/interactive-chat-box";
 import { renderWithProviders } from "../../test-utils";
 import { AgentState } from "#/types/agent-state";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 import { useConversationStore } from "#/state/conversation-store";
 
-// Mock the agent store
-vi.mock("#/stores/agent-store", () => ({
-  useAgentStore: vi.fn(),
+// Mock the agent state hook
+vi.mock("#/hooks/use-agent-state", () => ({
+  useAgentState: vi.fn(),
 }));
 
 // Mock the conversation store
@@ -57,14 +57,11 @@ vi.mock("#/hooks/use-conversation-name-context-menu", () => ({
 
 describe("InteractiveChatBox", () => {
   const onSubmitMock = vi.fn();
-  const onStopMock = vi.fn();
 
   // Helper function to mock stores
   const mockStores = (agentState: AgentState = AgentState.INIT) => {
-    vi.mocked(useAgentStore).mockReturnValue({
+    vi.mocked(useAgentState).mockReturnValue({
       curAgentState: agentState,
-      setCurrentAgentState: vi.fn(),
-      reset: vi.fn(),
     });
 
     vi.mocked(useConversationStore).mockReturnValue({
@@ -103,14 +100,13 @@ describe("InteractiveChatBox", () => {
   };
 
   // Helper function to render with Router context
-  const renderInteractiveChatBox = (props: any, options: any = {}) => {
-    return renderWithProviders(
+  const renderInteractiveChatBox = (props: any, options: any = {}) =>
+    renderWithProviders(
       <MemoryRouter>
         <InteractiveChatBox {...props} />
       </MemoryRouter>,
       options,
     );
-  };
 
   beforeAll(() => {
     global.URL.createObjectURL = vi
@@ -127,7 +123,6 @@ describe("InteractiveChatBox", () => {
 
     renderInteractiveChatBox({
       onSubmit: onSubmitMock,
-      onStop: onStopMock,
     });
 
     const chatBox = screen.getByTestId("interactive-chat-box");
@@ -140,7 +135,6 @@ describe("InteractiveChatBox", () => {
 
     renderInteractiveChatBox({
       onSubmit: onSubmitMock,
-      onStop: onStopMock,
     });
 
     const textbox = screen.getByTestId("chat-input");
@@ -157,7 +151,6 @@ describe("InteractiveChatBox", () => {
 
     renderInteractiveChatBox({
       onSubmit: onSubmitMock,
-      onStop: onStopMock,
     });
 
     // Create a larger file to ensure it passes validation
@@ -184,7 +177,6 @@ describe("InteractiveChatBox", () => {
 
     renderInteractiveChatBox({
       onSubmit: onSubmitMock,
-      onStop: onStopMock,
     });
 
     const fileContent = new Array(1024).fill("a").join(""); // 1KB file
@@ -209,7 +201,6 @@ describe("InteractiveChatBox", () => {
 
     renderInteractiveChatBox({
       onSubmit: onSubmitMock,
-      onStop: onStopMock,
     });
 
     const textarea = screen.getByTestId("chat-input");
@@ -240,7 +231,6 @@ describe("InteractiveChatBox", () => {
 
     renderInteractiveChatBox({
       onSubmit: onSubmitMock,
-      onStop: onStopMock,
     });
 
     const button = screen.getByTestId("submit-button");
@@ -250,33 +240,14 @@ describe("InteractiveChatBox", () => {
     expect(onSubmitMock).not.toHaveBeenCalled();
   });
 
-  it("should display the stop button when agent is running and call onStop when clicked", async () => {
-    const user = userEvent.setup();
-    mockStores(AgentState.RUNNING);
-
-    renderInteractiveChatBox({
-      onSubmit: onSubmitMock,
-      onStop: onStopMock,
-    });
-
-    // The stop button should be available when agent is running
-    const stopButton = screen.getByTestId("stop-button");
-    expect(stopButton).toBeInTheDocument();
-
-    await user.click(stopButton);
-    expect(onStopMock).toHaveBeenCalledOnce();
-  });
-
   it("should handle image upload and message submission correctly", async () => {
     const user = userEvent.setup();
     const onSubmit = vi.fn();
-    const onStop = vi.fn();
 
     mockStores(AgentState.AWAITING_USER_INPUT);
 
     const { rerender } = renderInteractiveChatBox({
-      onSubmit: onSubmit,
-      onStop: onStop,
+      onSubmit,
     });
 
     // Verify text input has the initial value
@@ -296,7 +267,7 @@ describe("InteractiveChatBox", () => {
     // Simulate parent component updating the value prop
     rerender(
       <MemoryRouter>
-        <InteractiveChatBox onSubmit={onSubmit} onStop={onStop} />
+        <InteractiveChatBox onSubmit={onSubmit} />
       </MemoryRouter>,
     );
 
diff --git a/frontend/__tests__/components/jupyter/jupyter.test.tsx b/frontend/__tests__/components/jupyter/jupyter.test.tsx
index 05ee023db6..bf6c746963 100644
--- a/frontend/__tests__/components/jupyter/jupyter.test.tsx
+++ b/frontend/__tests__/components/jupyter/jupyter.test.tsx
@@ -2,12 +2,12 @@ import { render, screen } from "@testing-library/react";
 import { JupyterEditor } from "#/components/features/jupyter/jupyter";
 import { vi, describe, it, expect, beforeEach } from "vitest";
 import { AgentState } from "#/types/agent-state";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 import { useJupyterStore } from "#/state/jupyter-store";
 
-// Mock the agent store
-vi.mock("#/stores/agent-store", () => ({
-  useAgentStore: vi.fn(),
+// Mock the agent state hook
+vi.mock("#/hooks/use-agent-state", () => ({
+  useAgentState: vi.fn(),
 }));
 
 // Mock react-i18next
@@ -30,11 +30,9 @@ describe("JupyterEditor", () => {
   });
 
   it("should have a scrollable container", () => {
-    // Mock agent store to return RUNNING state (not in RUNTIME_INACTIVE_STATES)
-    vi.mocked(useAgentStore).mockReturnValue({
+    // Mock agent state to return RUNNING state (not in RUNTIME_INACTIVE_STATES)
+    vi.mocked(useAgentState).mockReturnValue({
       curAgentState: AgentState.RUNNING,
-      setCurrentAgentState: vi.fn(),
-      reset: vi.fn(),
     });
 
     render(
diff --git a/frontend/__tests__/components/modals/microagents/microagent-modal.test.tsx b/frontend/__tests__/components/modals/microagents/microagent-modal.test.tsx
index 1dc6961345..f3b68c513d 100644
--- a/frontend/__tests__/components/modals/microagents/microagent-modal.test.tsx
+++ b/frontend/__tests__/components/modals/microagents/microagent-modal.test.tsx
@@ -5,11 +5,11 @@ import { renderWithProviders } from "test-utils";
 import { MicroagentsModal } from "#/components/features/conversation-panel/microagents-modal";
 import ConversationService from "#/api/conversation-service/conversation-service.api";
 import { AgentState } from "#/types/agent-state";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 
-// Mock the agent store
-vi.mock("#/stores/agent-store", () => ({
-  useAgentStore: vi.fn(),
+// Mock the agent state hook
+vi.mock("#/hooks/use-agent-state", () => ({
+  useAgentState: vi.fn(),
 }));
 
 // Mock the conversation ID hook
@@ -50,11 +50,9 @@ describe("MicroagentsModal - Refresh Button", () => {
       microagents: mockMicroagents,
     });
 
-    // Mock the agent store to return a ready state
-    vi.mocked(useAgentStore).mockReturnValue({
+    // Mock the agent state to return a ready state
+    vi.mocked(useAgentState).mockReturnValue({
       curAgentState: AgentState.AWAITING_USER_INPUT,
-      setCurrentAgentState: vi.fn(),
-      reset: vi.fn(),
     });
   });
 
diff --git a/frontend/__tests__/conversation-websocket-handler.test.tsx b/frontend/__tests__/conversation-websocket-handler.test.tsx
index db59d764d4..3dac31a8e0 100644
--- a/frontend/__tests__/conversation-websocket-handler.test.tsx
+++ b/frontend/__tests__/conversation-websocket-handler.test.tsx
@@ -1,5 +1,5 @@
 import { describe, it, expect, beforeAll, afterAll, afterEach } from "vitest";
-import { screen, waitFor, render } from "@testing-library/react";
+import { screen, waitFor, render, cleanup } from "@testing-library/react";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { useOptimisticUserMessageStore } from "#/stores/optimistic-user-message-store";
 import {
@@ -19,16 +19,34 @@ import { conversationWebSocketTestSetup } from "./helpers/msw-websocket-setup";
 // MSW WebSocket mock setup
 const { wsLink, server: mswServer } = conversationWebSocketTestSetup();
 
-beforeAll(() => mswServer.listen());
+beforeAll(() => {
+  // The global MSW server from vitest.setup.ts is already running
+  // We just need to start our WebSocket-specific server
+  mswServer.listen({ onUnhandledRequest: "bypass" });
+});
+
 afterEach(() => {
   mswServer.resetHandlers();
+  // Clean up any React components
+  cleanup();
+});
+
+afterAll(async () => {
+  // Close the WebSocket MSW server
+  mswServer.close();
+
+  // Give time for any pending WebSocket connections to close. This is very important to prevent serious memory leaks
+  await new Promise((resolve) => {
+    setTimeout(resolve, 500);
+  });
 });
-afterAll(() => mswServer.close());
 
 // Helper function to render components with ConversationWebSocketProvider
 function renderWithWebSocketContext(
   children: React.ReactNode,
   conversationId = "test-conversation-default",
+  conversationUrl = "http://localhost:3000/api/conversations/test-conversation-default",
+  sessionApiKey: string | null = null,
 ) {
   const queryClient = new QueryClient({
     defaultOptions: {
@@ -39,7 +57,11 @@ function renderWithWebSocketContext(
 
   return render(
     <QueryClientProvider client={queryClient}>
-      <ConversationWebSocketProvider conversationId={conversationId}>
+      <ConversationWebSocketProvider
+        conversationId={conversationId}
+        conversationUrl={conversationUrl}
+        sessionApiKey={sessionApiKey}
+      >
         {children}
       </ConversationWebSocketProvider>
     </QueryClientProvider>,
@@ -394,4 +416,98 @@ describe("Conversation WebSocket Handler", () => {
     it.todo("should send user actions through WebSocket when connected");
     it.todo("should handle send attempts when disconnected");
   });
+
+  // 8. Terminal I/O Tests (ExecuteBashAction and ExecuteBashObservation)
+  describe("Terminal I/O Integration", () => {
+    it("should append command to store when ExecuteBashAction event is received", async () => {
+      const { createMockExecuteBashActionEvent } = await import(
+        "#/mocks/mock-ws-helpers"
+      );
+      const { useCommandStore } = await import("#/state/command-store");
+
+      // Clear the command store before test
+      useCommandStore.getState().clearTerminal();
+
+      // Create a mock ExecuteBashAction event
+      const mockBashActionEvent = createMockExecuteBashActionEvent("npm test");
+
+      // Set up MSW to send the event when connection is established
+      mswServer.use(
+        wsLink.addEventListener("connection", ({ client, server }) => {
+          server.connect();
+          // Send the mock event after connection
+          client.send(JSON.stringify(mockBashActionEvent));
+        }),
+      );
+
+      // Render with WebSocket context (we don't need a component, just need the provider to be active)
+      renderWithWebSocketContext(<ConnectionStatusComponent />);
+
+      // Wait for connection
+      await waitFor(() => {
+        expect(screen.getByTestId("connection-state")).toHaveTextContent(
+          "OPEN",
+        );
+      });
+
+      // Wait for the command to be added to the store
+      await waitFor(() => {
+        const { commands } = useCommandStore.getState();
+        expect(commands.length).toBe(1);
+      });
+
+      // Verify the command was added with correct type and content
+      const { commands } = useCommandStore.getState();
+      expect(commands[0].type).toBe("input");
+      expect(commands[0].content).toBe("npm test");
+    });
+
+    it("should append output to store when ExecuteBashObservation event is received", async () => {
+      const { createMockExecuteBashObservationEvent } = await import(
+        "#/mocks/mock-ws-helpers"
+      );
+      const { useCommandStore } = await import("#/state/command-store");
+
+      // Clear the command store before test
+      useCommandStore.getState().clearTerminal();
+
+      // Create a mock ExecuteBashObservation event
+      const mockBashObservationEvent = createMockExecuteBashObservationEvent(
+        "PASS  tests/example.test.js\n  ✓ should work (2 ms)",
+        "npm test",
+      );
+
+      // Set up MSW to send the event when connection is established
+      mswServer.use(
+        wsLink.addEventListener("connection", ({ client, server }) => {
+          server.connect();
+          // Send the mock event after connection
+          client.send(JSON.stringify(mockBashObservationEvent));
+        }),
+      );
+
+      // Render with WebSocket context
+      renderWithWebSocketContext(<ConnectionStatusComponent />);
+
+      // Wait for connection
+      await waitFor(() => {
+        expect(screen.getByTestId("connection-state")).toHaveTextContent(
+          "OPEN",
+        );
+      });
+
+      // Wait for the output to be added to the store
+      await waitFor(() => {
+        const { commands } = useCommandStore.getState();
+        expect(commands.length).toBe(1);
+      });
+
+      // Verify the output was added with correct type and content
+      const { commands } = useCommandStore.getState();
+      expect(commands[0].type).toBe("output");
+      expect(commands[0].content).toBe(
+        "PASS  tests/example.test.js\n  ✓ should work (2 ms)",
+      );
+    });
+  });
 });
diff --git a/frontend/__tests__/helpers/msw-websocket-setup.ts b/frontend/__tests__/helpers/msw-websocket-setup.ts
index 560009e27e..76fe22d30c 100644
--- a/frontend/__tests__/helpers/msw-websocket-setup.ts
+++ b/frontend/__tests__/helpers/msw-websocket-setup.ts
@@ -37,6 +37,9 @@ export const createWebSocketTestSetup = (
 
 /**
  * Standard WebSocket test setup for conversation WebSocket handler tests
+ * Updated to use the V1 WebSocket URL pattern: /sockets/events/{conversationId}
  */
 export const conversationWebSocketTestSetup = () =>
-  createWebSocketTestSetup("ws://localhost/events/socket");
+  createWebSocketTestSetup(
+    "ws://localhost:3000/sockets/events/test-conversation-default",
+  );
diff --git a/frontend/__tests__/helpers/websocket-test-components.tsx b/frontend/__tests__/helpers/websocket-test-components.tsx
index 15fd2b4617..016a8f38b8 100644
--- a/frontend/__tests__/helpers/websocket-test-components.tsx
+++ b/frontend/__tests__/helpers/websocket-test-components.tsx
@@ -10,11 +10,13 @@ import { OpenHandsEvent } from "#/types/v1/core";
  * Test component to access and display WebSocket connection state
  */
 export function ConnectionStatusComponent() {
-  const { connectionState } = useConversationWebSocket();
+  const context = useConversationWebSocket();
 
   return (
     <div>
-      <div data-testid="connection-state">{connectionState}</div>
+      <div data-testid="connection-state">
+        {context?.connectionState || "NOT_AVAILABLE"}
+      </div>
     </div>
   );
 }
diff --git a/frontend/__tests__/hooks/use-terminal.test.tsx b/frontend/__tests__/hooks/use-terminal.test.tsx
index d1937986af..3988c43102 100644
--- a/frontend/__tests__/hooks/use-terminal.test.tsx
+++ b/frontend/__tests__/hooks/use-terminal.test.tsx
@@ -13,6 +13,22 @@ vi.mock("#/context/ws-client-provider", () => ({
   }),
 }));
 
+// Mock useActiveConversation
+vi.mock("#/hooks/query/use-active-conversation", () => ({
+  useActiveConversation: () => ({
+    data: {
+      id: "test-conversation-id",
+      conversation_version: "V0",
+    },
+    isFetched: true,
+  }),
+}));
+
+// Mock useConversationWebSocket (returns null for V0 conversations)
+vi.mock("#/contexts/conversation-websocket-context", () => ({
+  useConversationWebSocket: () => null,
+}));
+
 function TestTerminalComponent() {
   const ref = useTerminal();
   return <div ref={ref} />;
diff --git a/frontend/__tests__/hooks/use-websocket.test.ts b/frontend/__tests__/hooks/use-websocket.test.ts
index 7152f371c2..2559dc700d 100644
--- a/frontend/__tests__/hooks/use-websocket.test.ts
+++ b/frontend/__tests__/hooks/use-websocket.test.ts
@@ -12,7 +12,7 @@ import { ws } from "msw";
 import { setupServer } from "msw/node";
 import { useWebSocket } from "#/hooks/use-websocket";
 
-describe.skip("useWebSocket", () => {
+describe("useWebSocket", () => {
   // MSW WebSocket mock setup
   const wsLink = ws.link("ws://acme.com/ws");
 
diff --git a/frontend/__tests__/utils/check-hardcoded-strings.test.tsx b/frontend/__tests__/utils/check-hardcoded-strings.test.tsx
index dd0a9075fe..ff0de34962 100644
--- a/frontend/__tests__/utils/check-hardcoded-strings.test.tsx
+++ b/frontend/__tests__/utils/check-hardcoded-strings.test.tsx
@@ -60,7 +60,7 @@ describe("Check for hardcoded English strings", () => {
   test("InteractiveChatBox should not have hardcoded English strings", () => {
     const { container } = renderWithProviders(
       <MemoryRouter>
-        <InteractiveChatBox onSubmit={() => {}} onStop={() => {}} />
+        <InteractiveChatBox onSubmit={() => {}} />
       </MemoryRouter>,
     );
 
diff --git a/frontend/src/api/conversation-service/conversation-service.api.ts b/frontend/src/api/conversation-service/conversation-service.api.ts
index 04724d78ab..ed0ce8b678 100644
--- a/frontend/src/api/conversation-service/conversation-service.api.ts
+++ b/frontend/src/api/conversation-service/conversation-service.api.ts
@@ -11,7 +11,6 @@ import {
   CreateMicroagent,
   FileUploadSuccessResponse,
   GetFilesResponse,
-  GetFileResponse,
 } from "../open-hands.types";
 import { openHands } from "../open-hands-axios";
 import { Provider } from "#/types/settings";
@@ -159,19 +158,6 @@ class ConversationService {
     return data;
   }
 
-  /**
-   * Get the blob of the workspace zip
-   * @returns Blob of the workspace zip
-   */
-  static async getWorkspaceZip(conversationId: string): Promise<Blob> {
-    const url = `${this.getConversationUrl(conversationId)}/zip-directory`;
-    const response = await openHands.get(url, {
-      responseType: "blob",
-      headers: this.getConversationHeaders(),
-    });
-    return response.data;
-  }
-
   /**
    * Get the web hosts
    * @returns Array of web hosts
@@ -379,22 +365,6 @@ class ConversationService {
     return data;
   }
 
-  /**
-   * Retrieve the content of a file
-   * @param conversationId ID of the conversation
-   * @param path Full path of the file to retrieve
-   * @returns Code content of the file
-   */
-  static async getFile(conversationId: string, path: string): Promise<string> {
-    const url = `${this.getConversationUrl(conversationId)}/select-file`;
-    const { data } = await openHands.get<GetFileResponse>(url, {
-      params: { file: path },
-      headers: this.getConversationHeaders(),
-    });
-
-    return data.code;
-  }
-
   /**
    * Upload multiple files to the workspace
    * @param conversationId ID of the conversation
diff --git a/frontend/src/api/conversation-service/v1-conversation-service.api.ts b/frontend/src/api/conversation-service/v1-conversation-service.api.ts
new file mode 100644
index 0000000000..935574f1a8
--- /dev/null
+++ b/frontend/src/api/conversation-service/v1-conversation-service.api.ts
@@ -0,0 +1,258 @@
+import axios from "axios";
+import { openHands } from "../open-hands-axios";
+import { ConversationTrigger, GetVSCodeUrlResponse } from "../open-hands.types";
+import { Provider } from "#/types/settings";
+import { buildHttpBaseUrl } from "#/utils/websocket-url";
+import type {
+  V1SendMessageRequest,
+  V1SendMessageResponse,
+  V1AppConversationStartRequest,
+  V1AppConversationStartTask,
+  V1AppConversationStartTaskPage,
+  V1AppConversation,
+} from "./v1-conversation-service.types";
+
+class V1ConversationService {
+  /**
+   * Build headers for V1 API requests that require session authentication
+   * @param sessionApiKey Session API key for authentication
+   * @returns Headers object with X-Session-API-Key if provided
+   */
+  private static buildSessionHeaders(
+    sessionApiKey?: string | null,
+  ): Record<string, string> {
+    const headers: Record<string, string> = {};
+    if (sessionApiKey) {
+      headers["X-Session-API-Key"] = sessionApiKey;
+    }
+    return headers;
+  }
+
+  /**
+   * Build the full URL for V1 runtime-specific endpoints
+   * @param conversationUrl The conversation URL (e.g., "http://localhost:54928/api/conversations/...")
+   * @param path The API path (e.g., "/api/vscode/url")
+   * @returns Full URL to the runtime endpoint
+   */
+  private static buildRuntimeUrl(
+    conversationUrl: string | null | undefined,
+    path: string,
+  ): string {
+    const baseUrl = buildHttpBaseUrl(conversationUrl);
+    return `${baseUrl}${path}`;
+  }
+
+  /**
+   * Send a message to a V1 conversation
+   * @param conversationId The conversation ID
+   * @param message The message to send
+   * @returns The sent message response
+   */
+  static async sendMessage(
+    conversationId: string,
+    message: V1SendMessageRequest,
+  ): Promise<V1SendMessageResponse> {
+    const { data } = await openHands.post<V1SendMessageResponse>(
+      `/api/conversations/${conversationId}/events`,
+      message,
+    );
+
+    return data;
+  }
+
+  /**
+   * Create a new V1 conversation using the app-conversations API
+   * Returns the start task immediately with app_conversation_id as null.
+   * You must poll getStartTask() until status is READY to get the conversation ID.
+   *
+   * @returns AppConversationStartTask with task ID
+   */
+  static async createConversation(
+    selectedRepository?: string,
+    git_provider?: Provider,
+    initialUserMsg?: string,
+    selected_branch?: string,
+    conversationInstructions?: string,
+    trigger?: ConversationTrigger,
+  ): Promise<V1AppConversationStartTask> {
+    const body: V1AppConversationStartRequest = {
+      selected_repository: selectedRepository,
+      git_provider,
+      selected_branch,
+      title: conversationInstructions,
+      trigger,
+    };
+
+    // Add initial message if provided
+    if (initialUserMsg) {
+      body.initial_message = {
+        role: "user",
+        content: [
+          {
+            type: "text",
+            text: initialUserMsg,
+          },
+        ],
+      };
+    }
+
+    const { data } = await openHands.post<V1AppConversationStartTask>(
+      "/api/v1/app-conversations",
+      body,
+    );
+
+    return data;
+  }
+
+  /**
+   * Get a start task by ID
+   * Poll this endpoint until status is READY to get the app_conversation_id
+   *
+   * @param taskId The task UUID
+   * @returns AppConversationStartTask or null
+   */
+  static async getStartTask(
+    taskId: string,
+  ): Promise<V1AppConversationStartTask | null> {
+    const { data } = await openHands.get<(V1AppConversationStartTask | null)[]>(
+      `/api/v1/app-conversations/start-tasks?ids=${taskId}`,
+    );
+
+    return data[0] || null;
+  }
+
+  /**
+   * Search for start tasks (ongoing tasks that haven't completed yet)
+   * Use this to find tasks that were started but the user navigated away
+   *
+   * Note: Backend only supports filtering by limit. To filter by repository/trigger,
+   * filter the results client-side after fetching.
+   *
+   * @param limit Maximum number of tasks to return (max 100)
+   * @returns Array of start tasks
+   */
+  static async searchStartTasks(
+    limit: number = 100,
+  ): Promise<V1AppConversationStartTask[]> {
+    const params = new URLSearchParams();
+    params.append("limit", limit.toString());
+
+    const { data } = await openHands.get<V1AppConversationStartTaskPage>(
+      `/api/v1/app-conversations/start-tasks/search?${params.toString()}`,
+    );
+
+    return data.items;
+  }
+
+  /**
+   * Get the VSCode URL for a V1 conversation
+   * Uses the custom runtime URL from the conversation
+   * Note: V1 endpoint doesn't require conversationId in the URL path - it's identified via session API key header
+   *
+   * @param _conversationId The conversation ID (not used in V1, kept for interface compatibility)
+   * @param conversationUrl The conversation URL (e.g., "http://localhost:54928/api/conversations/...")
+   * @param sessionApiKey Session API key for authentication (required for V1)
+   * @returns VSCode URL response
+   */
+  static async getVSCodeUrl(
+    _conversationId: string,
+    conversationUrl: string | null | undefined,
+    sessionApiKey?: string | null,
+  ): Promise<GetVSCodeUrlResponse> {
+    const url = this.buildRuntimeUrl(conversationUrl, "/api/vscode/url");
+    const headers = this.buildSessionHeaders(sessionApiKey);
+
+    // V1 API returns {url: '...'} instead of {vscode_url: '...'}
+    // Map it to match the expected interface
+    const { data } = await axios.get<{ url: string | null }>(url, { headers });
+    return {
+      vscode_url: data.url,
+    };
+  }
+
+  /**
+   * Pause a V1 conversation
+   * Uses the custom runtime URL from the conversation
+   *
+   * @param conversationId The conversation ID
+   * @param conversationUrl The conversation URL (e.g., "http://localhost:54928/api/conversations/...")
+   * @param sessionApiKey Session API key for authentication (required for V1)
+   * @returns Success response
+   */
+  static async pauseConversation(
+    conversationId: string,
+    conversationUrl: string | null | undefined,
+    sessionApiKey?: string | null,
+  ): Promise<{ success: boolean }> {
+    const url = this.buildRuntimeUrl(
+      conversationUrl,
+      `/api/conversations/${conversationId}/pause`,
+    );
+    const headers = this.buildSessionHeaders(sessionApiKey);
+
+    const { data } = await axios.post<{ success: boolean }>(
+      url,
+      {},
+      { headers },
+    );
+    return data;
+  }
+
+  /**
+   * Pause a V1 sandbox
+   * Calls the /api/v1/sandboxes/{id}/pause endpoint
+   *
+   * @param sandboxId The sandbox ID to pause
+   * @returns Success response
+   */
+  static async pauseSandbox(sandboxId: string): Promise<{ success: boolean }> {
+    const { data } = await openHands.post<{ success: boolean }>(
+      `/api/v1/sandboxes/${sandboxId}/pause`,
+      {},
+    );
+    return data;
+  }
+
+  /**
+   * Resume a V1 sandbox
+   * Calls the /api/v1/sandboxes/{id}/resume endpoint
+   *
+   * @param sandboxId The sandbox ID to resume
+   * @returns Success response
+   */
+  static async resumeSandbox(sandboxId: string): Promise<{ success: boolean }> {
+    const { data } = await openHands.post<{ success: boolean }>(
+      `/api/v1/sandboxes/${sandboxId}/resume`,
+      {},
+    );
+    return data;
+  }
+
+  /**
+   * Batch get V1 app conversations by their IDs
+   * Returns null for any missing conversations
+   *
+   * @param ids Array of conversation IDs (max 100)
+   * @returns Array of conversations or null for missing ones
+   */
+  static async batchGetAppConversations(
+    ids: string[],
+  ): Promise<(V1AppConversation | null)[]> {
+    if (ids.length === 0) {
+      return [];
+    }
+    if (ids.length > 100) {
+      throw new Error("Cannot request more than 100 conversations at once");
+    }
+
+    const params = new URLSearchParams();
+    ids.forEach((id) => params.append("ids", id));
+
+    const { data } = await openHands.get<(V1AppConversation | null)[]>(
+      `/api/v1/app-conversations?${params.toString()}`,
+    );
+    return data;
+  }
+}
+
+export default V1ConversationService;
diff --git a/frontend/src/api/conversation-service/v1-conversation-service.types.ts b/frontend/src/api/conversation-service/v1-conversation-service.types.ts
new file mode 100644
index 0000000000..9ff3499652
--- /dev/null
+++ b/frontend/src/api/conversation-service/v1-conversation-service.types.ts
@@ -0,0 +1,100 @@
+import { ConversationTrigger } from "../open-hands.types";
+import { Provider } from "#/types/settings";
+
+// V1 API Types for requests
+// Note: This represents the serialized API format, not the internal TextContent/ImageContent types
+export interface V1MessageContent {
+  type: "text" | "image_url";
+  text?: string;
+  image_url?: {
+    url: string;
+  };
+}
+
+type V1Role = "user" | "system" | "assistant" | "tool";
+
+export interface V1SendMessageRequest {
+  role: V1Role;
+  content: V1MessageContent[];
+}
+
+export interface V1AppConversationStartRequest {
+  sandbox_id?: string | null;
+  initial_message?: V1SendMessageRequest | null;
+  processors?: unknown[]; // EventCallbackProcessor - keeping as unknown for now
+  llm_model?: string | null;
+  selected_repository?: string | null;
+  selected_branch?: string | null;
+  git_provider?: Provider | null;
+  title?: string | null;
+  trigger?: ConversationTrigger | null;
+  pr_number?: number[];
+}
+
+export type V1AppConversationStartTaskStatus =
+  | "WORKING"
+  | "WAITING_FOR_SANDBOX"
+  | "PREPARING_REPOSITORY"
+  | "RUNNING_SETUP_SCRIPT"
+  | "SETTING_UP_GIT_HOOKS"
+  | "STARTING_CONVERSATION"
+  | "READY"
+  | "ERROR";
+
+export interface V1AppConversationStartTask {
+  id: string;
+  created_by_user_id: string | null;
+  status: V1AppConversationStartTaskStatus;
+  detail: string | null;
+  app_conversation_id: string | null;
+  sandbox_id: string | null;
+  agent_server_url: string | null;
+  request: V1AppConversationStartRequest;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface V1SendMessageResponse {
+  role: "user" | "system" | "assistant" | "tool";
+  content: V1MessageContent[];
+}
+
+export interface V1AppConversationStartTaskPage {
+  items: V1AppConversationStartTask[];
+  next_page_id: string | null;
+}
+
+export type V1SandboxStatus =
+  | "MISSING"
+  | "STARTING"
+  | "RUNNING"
+  | "STOPPED"
+  | "PAUSED";
+
+export type V1AgentExecutionStatus =
+  | "RUNNING"
+  | "AWAITING_USER_INPUT"
+  | "AWAITING_USER_CONFIRMATION"
+  | "FINISHED"
+  | "PAUSED"
+  | "STOPPED";
+
+export interface V1AppConversation {
+  id: string;
+  created_by_user_id: string | null;
+  sandbox_id: string;
+  selected_repository: string | null;
+  selected_branch: string | null;
+  git_provider: Provider | null;
+  title: string | null;
+  trigger: ConversationTrigger | null;
+  pr_number: number[];
+  llm_model: string | null;
+  metrics: unknown | null;
+  created_at: string;
+  updated_at: string;
+  sandbox_status: V1SandboxStatus;
+  agent_status: V1AgentExecutionStatus | null;
+  conversation_url: string | null;
+  session_api_key: string | null;
+}
diff --git a/frontend/src/api/open-hands.types.ts b/frontend/src/api/open-hands.types.ts
index b7680029f8..48b5eef736 100644
--- a/frontend/src/api/open-hands.types.ts
+++ b/frontend/src/api/open-hands.types.ts
@@ -76,6 +76,7 @@ export interface Conversation {
   url: string | null;
   session_api_key: string | null;
   pr_number?: number[] | null;
+  conversation_version?: "V0" | "V1";
 }
 
 export interface ResultSet<T> {
diff --git a/frontend/src/components/features/chat/chat-interface.tsx b/frontend/src/components/features/chat/chat-interface.tsx
index 176999cd93..56ab3361bb 100644
--- a/frontend/src/components/features/chat/chat-interface.tsx
+++ b/frontend/src/components/features/chat/chat-interface.tsx
@@ -8,16 +8,16 @@ import { createChatMessage } from "#/services/chat-service";
 import { InteractiveChatBox } from "./interactive-chat-box";
 import { AgentState } from "#/types/agent-state";
 import { isOpenHandsAction, isActionOrObservation } from "#/types/core/guards";
-import { generateAgentStateChangeEvent } from "#/services/agent-state-service";
 import { FeedbackModal } from "../feedback/feedback-modal";
 import { useScrollToBottom } from "#/hooks/use-scroll-to-bottom";
 import { TypingIndicator } from "./typing-indicator";
 import { useWsClient } from "#/context/ws-client-provider";
-import { Messages } from "./messages";
+import { Messages as V0Messages } from "./messages";
 import { ChatSuggestions } from "./chat-suggestions";
 import { ScrollProvider } from "#/context/scroll-context";
 import { useInitialQueryStore } from "#/stores/initial-query-store";
-import { useAgentStore } from "#/stores/agent-store";
+import { useSendMessage } from "#/hooks/use-send-message";
+import { useAgentState } from "#/hooks/use-agent-state";
 
 import { ScrollToBottomButton } from "#/components/shared/buttons/scroll-to-bottom-button";
 import { LoadingSpinner } from "#/components/shared/loading-spinner";
@@ -30,12 +30,18 @@ import {
   hasUserEvent,
   shouldRenderEvent,
 } from "./event-content-helpers/should-render-event";
+import {
+  Messages as V1Messages,
+  hasUserEvent as hasV1UserEvent,
+  shouldRenderEvent as shouldRenderV1Event,
+} from "#/components/v1/chat";
 import { useUploadFiles } from "#/hooks/mutation/use-upload-files";
 import { useConfig } from "#/hooks/query/use-config";
 import { validateFiles } from "#/utils/file-validation";
 import { useConversationStore } from "#/state/conversation-store";
 import ConfirmationModeEnabled from "./confirmation-mode-enabled";
-import { isV0Event } from "#/types/v1/type-guards";
+import { isV0Event, isV1Event } from "#/types/v1/type-guards";
+import { useActiveConversation } from "#/hooks/query/use-active-conversation";
 
 function getEntryPoint(
   hasRepository: boolean | null,
@@ -48,8 +54,10 @@ function getEntryPoint(
 
 export function ChatInterface() {
   const { setMessageToSend } = useConversationStore();
+  const { data: conversation } = useActiveConversation();
   const { errorMessage } = useErrorMessageStore();
-  const { send, isLoadingMessages } = useWsClient();
+  const { isLoadingMessages } = useWsClient();
+  const { send } = useSendMessage();
   const storeEvents = useEventStore((state) => state.events);
   const { setOptimisticUserMessage, getOptimisticUserMessage } =
     useOptimisticUserMessageStore();
@@ -65,7 +73,7 @@ export function ChatInterface() {
   } = useScrollToBottom(scrollRef);
   const { data: config } = useConfig();
 
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
 
   const [feedbackPolarity, setFeedbackPolarity] = React.useState<
     "positive" | "negative"
@@ -77,11 +85,20 @@ export function ChatInterface() {
 
   const optimisticUserMessage = getOptimisticUserMessage();
 
-  const events = storeEvents
+  const isV1Conversation = conversation?.conversation_version === "V1";
+
+  // Filter V0 events
+  const v0Events = storeEvents
     .filter(isV0Event)
     .filter(isActionOrObservation)
     .filter(shouldRenderEvent);
 
+  // Filter V1 events
+  const v1Events = storeEvents.filter(isV1Event).filter(shouldRenderV1Event);
+
+  // Combined events count for tracking
+  const totalEvents = v0Events.length || v1Events.length;
+
   // Check if there are any substantive agent actions (not just system messages)
   const hasSubstantiveAgentActions = React.useMemo(
     () =>
@@ -93,7 +110,8 @@ export function ChatInterface() {
             isOpenHandsAction(event) &&
             event.source === "agent" &&
             event.action !== "system",
-        ),
+        ) ||
+      storeEvents.filter(isV1Event).some((event) => event.source === "agent"),
     [storeEvents],
   );
 
@@ -105,7 +123,7 @@ export function ChatInterface() {
     // Create mutable copies of the arrays
     const images = [...originalImages];
     const files = [...originalFiles];
-    if (events.length === 0) {
+    if (totalEvents === 0) {
       posthog.capture("initial_query_submitted", {
         entry_point: getEntryPoint(
           selectedRepository !== null,
@@ -116,7 +134,7 @@ export function ChatInterface() {
       });
     } else {
       posthog.capture("user_message_sent", {
-        session_message_count: events.length,
+        session_message_count: totalEvents,
         current_message_length: content.length,
       });
     }
@@ -151,11 +169,6 @@ export function ChatInterface() {
     setMessageToSend("");
   };
 
-  const handleStop = () => {
-    posthog.capture("stop_button_clicked");
-    send(generateAgentStateChangeEvent(AgentState.STOPPED));
-  };
-
   const onClickShareFeedbackActionButton = async (
     polarity: "positive" | "negative",
   ) => {
@@ -174,7 +187,9 @@ export function ChatInterface() {
     onChatBodyScroll,
   };
 
-  const userEventsExist = hasUserEvent(events);
+  const v0UserEventsExist = hasUserEvent(v0Events);
+  const v1UserEventsExist = hasV1UserEvent(v1Events);
+  const userEventsExist = v0UserEventsExist || v1UserEventsExist;
 
   return (
     <ScrollProvider value={scrollProviderValue}>
@@ -193,15 +208,24 @@ export function ChatInterface() {
           onScroll={(e) => onChatBodyScroll(e.currentTarget)}
           className="custom-scrollbar-always flex flex-col grow overflow-y-auto overflow-x-hidden px-4 pt-4 gap-2 fast-smooth-scroll"
         >
-          {isLoadingMessages && (
+          {isLoadingMessages && !isV1Conversation && (
             <div className="flex justify-center">
               <LoadingSpinner size="small" />
             </div>
           )}
 
-          {!isLoadingMessages && userEventsExist && (
-            <Messages
-              messages={events}
+          {!isLoadingMessages && v0UserEventsExist && (
+            <V0Messages
+              messages={v0Events}
+              isAwaitingUserConfirmation={
+                curAgentState === AgentState.AWAITING_USER_CONFIRMATION
+              }
+            />
+          )}
+
+          {v1UserEventsExist && (
+            <V1Messages
+              messages={v1Events}
               isAwaitingUserConfirmation={
                 curAgentState === AgentState.AWAITING_USER_CONFIRMATION
               }
@@ -213,7 +237,7 @@ export function ChatInterface() {
           <div className="flex justify-between relative">
             <div className="flex items-center gap-1">
               <ConfirmationModeEnabled />
-              {events.length > 0 && (
+              {totalEvents > 0 && (
                 <TrajectoryActions
                   onPositiveFeedback={() =>
                     onClickShareFeedbackActionButton("positive")
@@ -235,10 +259,7 @@ export function ChatInterface() {
 
           {errorMessage && <ErrorMessageBanner message={errorMessage} />}
 
-          <InteractiveChatBox
-            onSubmit={handleSendMessage}
-            onStop={handleStop}
-          />
+          <InteractiveChatBox onSubmit={handleSendMessage} />
         </div>
 
         {config?.APP_MODE !== "saas" && (
diff --git a/frontend/src/components/features/chat/components/chat-input-actions.tsx b/frontend/src/components/features/chat/components/chat-input-actions.tsx
index 5a1a19c3d5..4c20b4454c 100644
--- a/frontend/src/components/features/chat/components/chat-input-actions.tsx
+++ b/frontend/src/components/features/chat/components/chat-input-actions.tsx
@@ -2,33 +2,73 @@ import { ConversationStatus } from "#/types/conversation-status";
 import { ServerStatus } from "#/components/features/controls/server-status";
 import { AgentStatus } from "#/components/features/controls/agent-status";
 import { Tools } from "../../controls/tools";
+import { useUnifiedPauseConversationSandbox } from "#/hooks/mutation/use-unified-stop-conversation";
+import { useConversationId } from "#/hooks/use-conversation-id";
+import { useUnifiedResumeConversationSandbox } from "#/hooks/mutation/use-unified-start-conversation";
+import { useUserProviders } from "#/hooks/use-user-providers";
+import { useActiveConversation } from "#/hooks/query/use-active-conversation";
+import { useSendMessage } from "#/hooks/use-send-message";
+import { generateAgentStateChangeEvent } from "#/services/agent-state-service";
+import { AgentState } from "#/types/agent-state";
 
 interface ChatInputActionsProps {
   conversationStatus: ConversationStatus | null;
   disabled: boolean;
-  handleStop: (onStop?: () => void) => void;
   handleResumeAgent: () => void;
-  onStop?: () => void;
 }
 
 export function ChatInputActions({
   conversationStatus,
   disabled,
-  handleStop,
   handleResumeAgent,
-  onStop,
 }: ChatInputActionsProps) {
+  const { data: conversation } = useActiveConversation();
+  const pauseConversationSandboxMutation = useUnifiedPauseConversationSandbox();
+  const resumeConversationSandboxMutation =
+    useUnifiedResumeConversationSandbox();
+  const { conversationId } = useConversationId();
+  const { providers } = useUserProviders();
+  const { send } = useSendMessage();
+
+  const isV1Conversation = conversation?.conversation_version === "V1";
+
+  const handleStopClick = () => {
+    pauseConversationSandboxMutation.mutate({ conversationId });
+  };
+
+  const handlePauseAgent = () => {
+    if (isV1Conversation) {
+      // V1: Empty function for now
+      return;
+    }
+
+    // V0: Send agent state change event to stop the agent
+    send(generateAgentStateChangeEvent(AgentState.STOPPED));
+  };
+
+  const handleStartClick = () => {
+    resumeConversationSandboxMutation.mutate({ conversationId, providers });
+  };
+
+  const isPausing = pauseConversationSandboxMutation.isPending;
+
   return (
     <div className="w-full flex items-center justify-between">
       <div className="flex items-center gap-1">
         <Tools />
-        <ServerStatus conversationStatus={conversationStatus} />
+        <ServerStatus
+          conversationStatus={conversationStatus}
+          isPausing={isPausing}
+          handleStop={handleStopClick}
+          handleResumeAgent={handleStartClick}
+        />
       </div>
       <AgentStatus
         className="ml-2 md:ml-3"
-        handleStop={() => handleStop(onStop)}
+        handleStop={handlePauseAgent}
         handleResumeAgent={handleResumeAgent}
         disabled={disabled}
+        isPausing={isPausing}
       />
     </div>
   );
diff --git a/frontend/src/components/features/chat/components/chat-input-container.tsx b/frontend/src/components/features/chat/components/chat-input-container.tsx
index f87c2940d4..39d9bbe745 100644
--- a/frontend/src/components/features/chat/components/chat-input-container.tsx
+++ b/frontend/src/components/features/chat/components/chat-input-container.tsx
@@ -15,7 +15,6 @@ interface ChatInputContainerProps {
   chatInputRef: React.RefObject<HTMLDivElement | null>;
   handleFileIconClick: (isDisabled: boolean) => void;
   handleSubmit: () => void;
-  handleStop: (onStop?: () => void) => void;
   handleResumeAgent: () => void;
   onDragOver: (e: React.DragEvent, isDisabled: boolean) => void;
   onDragLeave: (e: React.DragEvent, isDisabled: boolean) => void;
@@ -25,7 +24,6 @@ interface ChatInputContainerProps {
   onKeyDown: (e: React.KeyboardEvent) => void;
   onFocus?: () => void;
   onBlur?: () => void;
-  onStop?: () => void;
 }
 
 export function ChatInputContainer({
@@ -38,7 +36,6 @@ export function ChatInputContainer({
   chatInputRef,
   handleFileIconClick,
   handleSubmit,
-  handleStop,
   handleResumeAgent,
   onDragOver,
   onDragLeave,
@@ -48,7 +45,6 @@ export function ChatInputContainer({
   onKeyDown,
   onFocus,
   onBlur,
-  onStop,
 }: ChatInputContainerProps) {
   return (
     <div
@@ -80,9 +76,7 @@ export function ChatInputContainer({
       <ChatInputActions
         conversationStatus={conversationStatus}
         disabled={disabled}
-        handleStop={handleStop}
         handleResumeAgent={handleResumeAgent}
-        onStop={onStop}
       />
     </div>
   );
diff --git a/frontend/src/components/features/chat/custom-chat-input.tsx b/frontend/src/components/features/chat/custom-chat-input.tsx
index 5cf3c13442..9c12beefca 100644
--- a/frontend/src/components/features/chat/custom-chat-input.tsx
+++ b/frontend/src/components/features/chat/custom-chat-input.tsx
@@ -15,7 +15,6 @@ export interface CustomChatInputProps {
   showButton?: boolean;
   conversationStatus?: ConversationStatus | null;
   onSubmit: (message: string) => void;
-  onStop?: () => void;
   onFocus?: () => void;
   onBlur?: () => void;
   onFilesPaste?: (files: File[]) => void;
@@ -28,7 +27,6 @@ export function CustomChatInput({
   showButton = true,
   conversationStatus = null,
   onSubmit,
-  onStop,
   onFocus,
   onBlur,
   onFilesPaste,
@@ -88,7 +86,7 @@ export function CustomChatInput({
     messageToSend,
   );
 
-  const { handleSubmit, handleResumeAgent, handleStop } = useChatSubmission(
+  const { handleSubmit, handleResumeAgent } = useChatSubmission(
     chatInputRef as React.RefObject<HTMLDivElement | null>,
     fileInputRef as React.RefObject<HTMLInputElement | null>,
     smartResize,
@@ -143,7 +141,6 @@ export function CustomChatInput({
           chatInputRef={chatInputRef}
           handleFileIconClick={handleFileIconClick}
           handleSubmit={handleSubmit}
-          handleStop={handleStop}
           handleResumeAgent={handleResumeAgent}
           onDragOver={handleDragOver}
           onDragLeave={handleDragLeave}
@@ -153,7 +150,6 @@ export function CustomChatInput({
           onKeyDown={(e) => handleKeyDown(e, isDisabled, handleSubmit)}
           onFocus={handleFocus}
           onBlur={handleBlur}
-          onStop={onStop}
         />
       </div>
     </div>
diff --git a/frontend/src/components/features/chat/interactive-chat-box.tsx b/frontend/src/components/features/chat/interactive-chat-box.tsx
index 2818cd09e6..4c94df4b42 100644
--- a/frontend/src/components/features/chat/interactive-chat-box.tsx
+++ b/frontend/src/components/features/chat/interactive-chat-box.tsx
@@ -6,18 +6,14 @@ import { AgentState } from "#/types/agent-state";
 import { useActiveConversation } from "#/hooks/query/use-active-conversation";
 import { GitControlBar } from "./git-control-bar";
 import { useConversationStore } from "#/state/conversation-store";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 import { processFiles, processImages } from "#/utils/file-processing";
 
 interface InteractiveChatBoxProps {
   onSubmit: (message: string, images: File[], files: File[]) => void;
-  onStop: () => void;
 }
 
-export function InteractiveChatBox({
-  onSubmit,
-  onStop,
-}: InteractiveChatBoxProps) {
+export function InteractiveChatBox({ onSubmit }: InteractiveChatBoxProps) {
   const {
     images,
     files,
@@ -29,7 +25,7 @@ export function InteractiveChatBox({
     addImageLoading,
     removeImageLoading,
   } = useConversationStore();
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
   const { data: conversation } = useActiveConversation();
 
   // Helper function to validate and filter files
@@ -145,7 +141,6 @@ export function InteractiveChatBox({
       <CustomChatInput
         disabled={isDisabled}
         onSubmit={handleSubmit}
-        onStop={onStop}
         onFilesPaste={handleUpload}
         conversationStatus={conversation?.status || null}
       />
diff --git a/frontend/src/components/features/controls/agent-status.tsx b/frontend/src/components/features/controls/agent-status.tsx
index a549d9bcbc..29ed67e3ca 100644
--- a/frontend/src/components/features/controls/agent-status.tsx
+++ b/frontend/src/components/features/controls/agent-status.tsx
@@ -1,7 +1,6 @@
 import { useTranslation } from "react-i18next";
 import { useEffect } from "react";
 import { useStatusStore } from "#/state/status-store";
-import { useWsClient } from "#/context/ws-client-provider";
 import { useActiveConversation } from "#/hooks/query/use-active-conversation";
 import { getStatusCode } from "#/utils/status";
 import { ChatStopButton } from "../chat/chat-stop-button";
@@ -12,13 +11,15 @@ import { cn } from "#/utils/utils";
 import { AgentLoading } from "./agent-loading";
 import { useConversationStore } from "#/state/conversation-store";
 import CircleErrorIcon from "#/icons/circle-error.svg?react";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
+import { useUnifiedWebSocketStatus } from "#/hooks/use-unified-websocket-status";
 
 export interface AgentStatusProps {
   className?: string;
   handleStop: () => void;
   handleResumeAgent: () => void;
   disabled?: boolean;
+  isPausing?: boolean;
 }
 
 export function AgentStatus({
@@ -26,12 +27,13 @@ export function AgentStatus({
   handleStop,
   handleResumeAgent,
   disabled = false,
+  isPausing = false,
 }: AgentStatusProps) {
   const { t } = useTranslation();
   const { setShouldShownAgentLoading } = useConversationStore();
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
   const { curStatusMessage } = useStatusStore();
-  const { webSocketStatus } = useWsClient();
+  const webSocketStatus = useUnifiedWebSocketStatus();
   const { data: conversation } = useActiveConversation();
 
   const statusCode = getStatusCode(
@@ -43,6 +45,7 @@ export function AgentStatus({
   );
 
   const shouldShownAgentLoading =
+    isPausing ||
     curAgentState === AgentState.INIT ||
     curAgentState === AgentState.LOADING ||
     webSocketStatus === "CONNECTING";
diff --git a/frontend/src/components/features/controls/server-status.tsx b/frontend/src/components/features/controls/server-status.tsx
index 96e28277e9..aad03df7be 100644
--- a/frontend/src/components/features/controls/server-status.tsx
+++ b/frontend/src/components/features/controls/server-status.tsx
@@ -5,31 +5,29 @@ import { I18nKey } from "#/i18n/declaration";
 import { ConversationStatus } from "#/types/conversation-status";
 import { AgentState } from "#/types/agent-state";
 import { ServerStatusContextMenu } from "./server-status-context-menu";
-import { useStartConversation } from "#/hooks/mutation/use-start-conversation";
-import { useConversationId } from "#/hooks/use-conversation-id";
-import { useUserProviders } from "#/hooks/use-user-providers";
-import { useStopConversation } from "#/hooks/mutation/use-stop-conversation";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
+import { useTaskPolling } from "#/hooks/query/use-task-polling";
 
 export interface ServerStatusProps {
   className?: string;
   conversationStatus: ConversationStatus | null;
+  isPausing?: boolean;
+  handleStop: () => void;
+  handleResumeAgent: () => void;
 }
 
 export function ServerStatus({
   className = "",
   conversationStatus,
+  isPausing = false,
+  handleStop,
+  handleResumeAgent,
 }: ServerStatusProps) {
   const [showContextMenu, setShowContextMenu] = useState(false);
 
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
   const { t } = useTranslation();
-  const { conversationId } = useConversationId();
-
-  // Mutation hooks
-  const stopConversationMutation = useStopConversation();
-  const startConversationMutation = useStartConversation();
-  const { providers } = useUserProviders();
+  const { isTask, taskStatus, taskDetail } = useTaskPolling();
 
   const isStartingStatus =
     curAgentState === AgentState.LOADING || curAgentState === AgentState.INIT;
@@ -38,6 +36,19 @@ export function ServerStatus({
 
   // Get the appropriate color based on agent status
   const getStatusColor = (): string => {
+    // Show pausing status
+    if (isPausing) {
+      return "#FFD600";
+    }
+
+    // Show task status if we're polling a task
+    if (isTask && taskStatus) {
+      if (taskStatus === "ERROR") {
+        return "#FF684E";
+      }
+      return "#FFD600";
+    }
+
     if (isStartingStatus) {
       return "#FFD600";
     }
@@ -52,6 +63,31 @@ export function ServerStatus({
 
   // Get the appropriate status text based on agent status
   const getStatusText = (): string => {
+    // Show pausing status
+    if (isPausing) {
+      return t(I18nKey.COMMON$STOPPING);
+    }
+
+    // Show task status if we're polling a task
+    if (isTask && taskStatus) {
+      if (taskStatus === "ERROR") {
+        return (
+          taskDetail || t(I18nKey.CONVERSATION$ERROR_STARTING_CONVERSATION)
+        );
+      }
+      if (taskStatus === "READY") {
+        return t(I18nKey.CONVERSATION$READY);
+      }
+      // Format status text: "WAITING_FOR_SANDBOX" -> "Waiting for sandbox"
+      return (
+        taskDetail ||
+        taskStatus
+          .toLowerCase()
+          .replace(/_/g, " ")
+          .replace(/\b\w/g, (c) => c.toUpperCase())
+      );
+    }
+
     if (isStartingStatus) {
       return t(I18nKey.COMMON$STARTING);
     }
@@ -76,16 +112,13 @@ export function ServerStatus({
 
   const handleStopServer = (event: React.MouseEvent<HTMLButtonElement>) => {
     event.preventDefault();
-    stopConversationMutation.mutate({ conversationId });
+    handleStop();
     setShowContextMenu(false);
   };
 
   const handleStartServer = (event: React.MouseEvent<HTMLButtonElement>) => {
     event.preventDefault();
-    startConversationMutation.mutate({
-      conversationId,
-      providers,
-    });
+    handleResumeAgent();
     setShowContextMenu(false);
   };
 
diff --git a/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-actions.tsx b/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-actions.tsx
index 11ccad06f5..43b7bc1987 100644
--- a/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-actions.tsx
+++ b/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-actions.tsx
@@ -27,6 +27,8 @@ export function ConversationCardActions({
   conversationId,
   showOptions,
 }: ConversationCardActionsProps) {
+  const isConversationArchived = conversationStatus === "ARCHIVED";
+
   return (
     <div className="group">
       <button
@@ -37,7 +39,10 @@ export function ConversationCardActions({
           event.stopPropagation();
           onContextMenuToggle(!contextMenuOpen);
         }}
-        className="cursor-pointer w-6 h-6 flex flex-row items-center justify-center translate-x-2.5"
+        className={cn(
+          "cursor-pointer w-6 h-6 flex flex-row items-center justify-center translate-x-2.5",
+          isConversationArchived && "opacity-60",
+        )}
       >
         <EllipsisIcon />
       </button>
diff --git a/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-footer.tsx b/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-footer.tsx
index 3c969dbb59..fb77b58242 100644
--- a/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-footer.tsx
+++ b/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-footer.tsx
@@ -5,22 +5,32 @@ import { I18nKey } from "#/i18n/declaration";
 import { RepositorySelection } from "#/api/open-hands.types";
 import { ConversationRepoLink } from "./conversation-repo-link";
 import { NoRepository } from "./no-repository";
+import { ConversationStatus } from "#/types/conversation-status";
 
 interface ConversationCardFooterProps {
   selectedRepository: RepositorySelection | null;
   lastUpdatedAt: string; // ISO 8601
   createdAt?: string; // ISO 8601
+  conversationStatus?: ConversationStatus;
 }
 
 export function ConversationCardFooter({
   selectedRepository,
   lastUpdatedAt,
   createdAt,
+  conversationStatus,
 }: ConversationCardFooterProps) {
   const { t } = useTranslation();
 
+  const isConversationArchived = conversationStatus === "ARCHIVED";
+
   return (
-    <div className={cn("flex flex-row justify-between items-center mt-1")}>
+    <div
+      className={cn(
+        "flex flex-row justify-between items-center mt-1",
+        isConversationArchived && "opacity-60",
+      )}
+    >
       {selectedRepository?.selected_repository ? (
         <ConversationRepoLink selectedRepository={selectedRepository} />
       ) : (
diff --git a/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-header.tsx b/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-header.tsx
index 05b54973ab..e41d9fa111 100644
--- a/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-header.tsx
+++ b/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-header.tsx
@@ -2,12 +2,14 @@ import { ConversationStatus } from "#/types/conversation-status";
 import { ConversationCardTitle } from "./conversation-card-title";
 import { ConversationStatusIndicator } from "../../home/recent-conversations/conversation-status-indicator";
 import { ConversationStatusBadges } from "./conversation-status-badges";
+import { ConversationVersionBadge } from "./conversation-version-badge";
 
 interface ConversationCardHeaderProps {
   title: string;
   titleMode: "view" | "edit";
   onTitleSave: (title: string) => void;
   conversationStatus?: ConversationStatus;
+  conversationVersion?: "V0" | "V1";
 }
 
 export function ConversationCardHeader({
@@ -15,7 +17,10 @@ export function ConversationCardHeader({
   titleMode,
   onTitleSave,
   conversationStatus,
+  conversationVersion,
 }: ConversationCardHeaderProps) {
+  const isConversationArchived = conversationStatus === "ARCHIVED";
+
   return (
     <div className="flex items-center gap-2 flex-1 min-w-0 overflow-hidden mr-2">
       {/* Status Indicator */}
@@ -26,10 +31,16 @@ export function ConversationCardHeader({
           />
         </div>
       )}
+      {/* Version Badge */}
+      <ConversationVersionBadge
+        version={conversationVersion}
+        isConversationArchived={isConversationArchived}
+      />
       <ConversationCardTitle
         title={title}
         titleMode={titleMode}
         onSave={onTitleSave}
+        isConversationArchived={isConversationArchived}
       />
       {/* Status Badges */}
       {conversationStatus && (
diff --git a/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-title.tsx b/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-title.tsx
index 9faa8d1500..dc10742e88 100644
--- a/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-title.tsx
+++ b/frontend/src/components/features/conversation-panel/conversation-card/conversation-card-title.tsx
@@ -1,15 +1,19 @@
+import { cn } from "#/utils/utils";
+
 export type ConversationCardTitleMode = "view" | "edit";
 
 export type ConversationCardTitleProps = {
   titleMode: ConversationCardTitleMode;
   title: string;
   onSave: (title: string) => void;
+  isConversationArchived?: boolean;
 };
 
 export function ConversationCardTitle({
   titleMode,
   title,
   onSave,
+  isConversationArchived,
 }: ConversationCardTitleProps) {
   if (titleMode === "edit") {
     return (
@@ -40,7 +44,10 @@ export function ConversationCardTitle({
   return (
     <p
       data-testid="conversation-card-title"
-      className="text-xs leading-6 font-semibold bg-transparent truncate overflow-hidden"
+      className={cn(
+        "text-xs leading-6 font-semibold bg-transparent truncate overflow-hidden",
+        isConversationArchived && "opacity-60",
+      )}
       title={title}
     >
       {title}
diff --git a/frontend/src/components/features/conversation-panel/conversation-card/conversation-card.tsx b/frontend/src/components/features/conversation-panel/conversation-card/conversation-card.tsx
index 00f13083de..8c6b895eaf 100644
--- a/frontend/src/components/features/conversation-panel/conversation-card/conversation-card.tsx
+++ b/frontend/src/components/features/conversation-panel/conversation-card/conversation-card.tsx
@@ -21,6 +21,7 @@ interface ConversationCardProps {
   createdAt?: string; // ISO 8601
   conversationStatus?: ConversationStatus;
   conversationId?: string; // Optional conversation ID for VS Code URL
+  conversationVersion?: "V0" | "V1";
   contextMenuOpen?: boolean;
   onContextMenuToggle?: (isOpen: boolean) => void;
 }
@@ -39,6 +40,7 @@ export function ConversationCard({
   createdAt,
   conversationId,
   conversationStatus,
+  conversationVersion,
   contextMenuOpen = false,
   onContextMenuToggle,
 }: ConversationCardProps) {
@@ -108,7 +110,6 @@ export function ConversationCard({
       className={cn(
         "relative h-auto w-full p-3.5 border-b border-neutral-600 cursor-pointer",
         "data-[context-menu-open=false]:hover:bg-[#454545]",
-        conversationStatus === "ARCHIVED" && "opacity-60",
       )}
     >
       <div className="flex items-center justify-between w-full">
@@ -117,6 +118,7 @@ export function ConversationCard({
           titleMode={titleMode}
           onTitleSave={onTitleSave}
           conversationStatus={conversationStatus}
+          conversationVersion={conversationVersion}
         />
 
         {hasContextMenu && (
@@ -138,6 +140,7 @@ export function ConversationCard({
         selectedRepository={selectedRepository}
         lastUpdatedAt={lastUpdatedAt}
         createdAt={createdAt}
+        conversationStatus={conversationStatus}
       />
     </div>
   );
diff --git a/frontend/src/components/features/conversation-panel/conversation-card/conversation-status-badges.tsx b/frontend/src/components/features/conversation-panel/conversation-card/conversation-status-badges.tsx
index e78e363c24..c6e5522430 100644
--- a/frontend/src/components/features/conversation-panel/conversation-card/conversation-status-badges.tsx
+++ b/frontend/src/components/features/conversation-panel/conversation-card/conversation-status-badges.tsx
@@ -15,7 +15,7 @@ export function ConversationStatusBadges({
 
   if (conversationStatus === "ARCHIVED") {
     return (
-      <span className="flex items-center gap-1 px-1.5 py-0.5 bg-[#868E96] text-white text-xs font-medium rounded-full">
+      <span className="flex items-center gap-1 px-1.5 py-0.5 bg-[#868E96] text-white text-xs font-medium rounded-full opacity-60">
         <FaArchive size={10} className="text-white" />
         <span>{t(I18nKey.COMMON$ARCHIVED)}</span>
       </span>
diff --git a/frontend/src/components/features/conversation-panel/conversation-card/conversation-version-badge.tsx b/frontend/src/components/features/conversation-panel/conversation-card/conversation-version-badge.tsx
new file mode 100644
index 0000000000..371b5f98aa
--- /dev/null
+++ b/frontend/src/components/features/conversation-panel/conversation-card/conversation-version-badge.tsx
@@ -0,0 +1,39 @@
+import { Tooltip } from "@heroui/react";
+import { useTranslation } from "react-i18next";
+import { cn } from "#/utils/utils";
+import { I18nKey } from "#/i18n/declaration";
+
+interface ConversationVersionBadgeProps {
+  version?: "V0" | "V1";
+  isConversationArchived?: boolean;
+}
+
+export function ConversationVersionBadge({
+  version,
+  isConversationArchived,
+}: ConversationVersionBadgeProps) {
+  const { t } = useTranslation();
+
+  if (!version) return null;
+
+  const tooltipText =
+    version === "V1"
+      ? t(I18nKey.CONVERSATION$VERSION_V1_NEW)
+      : t(I18nKey.CONVERSATION$VERSION_V0_LEGACY);
+
+  return (
+    <Tooltip content={tooltipText} placement="top">
+      <span
+        className={cn(
+          "inline-flex items-center px-1.5 py-0.5 rounded text-[10px] font-semibold shrink-0 cursor-help lowercase",
+          version === "V1"
+            ? "bg-green-500/20 text-green-500"
+            : "bg-neutral-500/20 text-neutral-400",
+          isConversationArchived && "opacity-60",
+        )}
+      >
+        {version}
+      </span>
+    </Tooltip>
+  );
+}
diff --git a/frontend/src/components/features/conversation-panel/conversation-panel.tsx b/frontend/src/components/features/conversation-panel/conversation-panel.tsx
index c502f39453..e38e2f272e 100644
--- a/frontend/src/components/features/conversation-panel/conversation-panel.tsx
+++ b/frontend/src/components/features/conversation-panel/conversation-panel.tsx
@@ -3,9 +3,10 @@ import { NavLink, useParams, useNavigate } from "react-router";
 import { useTranslation } from "react-i18next";
 import { I18nKey } from "#/i18n/declaration";
 import { usePaginatedConversations } from "#/hooks/query/use-paginated-conversations";
+import { useStartTasks } from "#/hooks/query/use-start-tasks";
 import { useInfiniteScroll } from "#/hooks/use-infinite-scroll";
 import { useDeleteConversation } from "#/hooks/mutation/use-delete-conversation";
-import { useStopConversation } from "#/hooks/mutation/use-stop-conversation";
+import { useUnifiedPauseConversationSandbox } from "#/hooks/mutation/use-unified-stop-conversation";
 import { ConfirmDeleteModal } from "./confirm-delete-modal";
 import { ConfirmStopModal } from "./confirm-stop-modal";
 import { LoadingSpinner } from "#/components/shared/loading-spinner";
@@ -15,6 +16,7 @@ import { Provider } from "#/types/settings";
 import { useUpdateConversation } from "#/hooks/mutation/use-update-conversation";
 import { displaySuccessToast } from "#/utils/custom-toast-handlers";
 import { ConversationCard } from "./conversation-card/conversation-card";
+import { StartTaskCard } from "./start-task-card/start-task-card";
 
 interface ConversationPanelProps {
   onClose: () => void;
@@ -37,6 +39,8 @@ export function ConversationPanel({ onClose }: ConversationPanelProps) {
   const [selectedConversationId, setSelectedConversationId] = React.useState<
     string | null
   >(null);
+  const [selectedConversationVersion, setSelectedConversationVersion] =
+    React.useState<"V0" | "V1" | undefined>(undefined);
   const [openContextMenuId, setOpenContextMenuId] = React.useState<
     string | null
   >(null);
@@ -50,11 +54,15 @@ export function ConversationPanel({ onClose }: ConversationPanelProps) {
     fetchNextPage,
   } = usePaginatedConversations();
 
+  // Fetch in-progress start tasks
+  const { data: startTasks } = useStartTasks();
+
   // Flatten all pages into a single array of conversations
   const conversations = data?.pages.flatMap((page) => page.results) ?? [];
 
   const { mutate: deleteConversation } = useDeleteConversation();
-  const { mutate: stopConversation } = useStopConversation();
+  const { mutate: pauseConversationSandbox } =
+    useUnifiedPauseConversationSandbox();
   const { mutate: updateConversation } = useUpdateConversation();
 
   // Set up infinite scroll
@@ -70,9 +78,13 @@ export function ConversationPanel({ onClose }: ConversationPanelProps) {
     setSelectedConversationId(conversationId);
   };
 
-  const handleStopConversation = (conversationId: string) => {
+  const handleStopConversation = (
+    conversationId: string,
+    version?: "V0" | "V1",
+  ) => {
     setConfirmStopModalVisible(true);
     setSelectedConversationId(conversationId);
+    setSelectedConversationVersion(version);
   };
 
   const handleConversationTitleChange = async (
@@ -106,7 +118,10 @@ export function ConversationPanel({ onClose }: ConversationPanelProps) {
 
   const handleConfirmStop = () => {
     if (selectedConversationId) {
-      stopConversation({ conversationId: selectedConversationId });
+      pauseConversationSandbox({
+        conversationId: selectedConversationId,
+        version: selectedConversationVersion,
+      });
     }
   };
 
@@ -131,13 +146,24 @@ export function ConversationPanel({ onClose }: ConversationPanelProps) {
           <p className="text-danger">{error.message}</p>
         </div>
       )}
-      {!isFetching && conversations?.length === 0 && (
+      {!isFetching && conversations?.length === 0 && !startTasks?.length && (
         <div className="flex flex-col items-center justify-center h-full">
           <p className="text-neutral-400">
             {t(I18nKey.CONVERSATION$NO_CONVERSATIONS)}
           </p>
         </div>
       )}
+      {/* Render in-progress start tasks first */}
+      {startTasks?.map((task) => (
+        <NavLink
+          key={task.id}
+          to={`/conversations/task-${task.id}`}
+          onClick={onClose}
+        >
+          <StartTaskCard task={task} />
+        </NavLink>
+      ))}
+      {/* Then render completed conversations */}
       {conversations?.map((project) => (
         <NavLink
           key={project.conversation_id}
@@ -146,7 +172,12 @@ export function ConversationPanel({ onClose }: ConversationPanelProps) {
         >
           <ConversationCard
             onDelete={() => handleDeleteProject(project.conversation_id)}
-            onStop={() => handleStopConversation(project.conversation_id)}
+            onStop={() =>
+              handleStopConversation(
+                project.conversation_id,
+                project.conversation_version,
+              )
+            }
             onChangeTitle={(title) =>
               handleConversationTitleChange(project.conversation_id, title)
             }
@@ -160,6 +191,7 @@ export function ConversationPanel({ onClose }: ConversationPanelProps) {
             createdAt={project.created_at}
             conversationStatus={project.status}
             conversationId={project.conversation_id}
+            conversationVersion={project.conversation_version}
             contextMenuOpen={openContextMenuId === project.conversation_id}
             onContextMenuToggle={(isOpen) =>
               setOpenContextMenuId(isOpen ? project.conversation_id : null)
diff --git a/frontend/src/components/features/conversation-panel/microagents-modal.tsx b/frontend/src/components/features/conversation-panel/microagents-modal.tsx
index f255f4adce..66bc340422 100644
--- a/frontend/src/components/features/conversation-panel/microagents-modal.tsx
+++ b/frontend/src/components/features/conversation-panel/microagents-modal.tsx
@@ -10,7 +10,7 @@ import { MicroagentsModalHeader } from "./microagents-modal-header";
 import { MicroagentsLoadingState } from "./microagents-loading-state";
 import { MicroagentsEmptyState } from "./microagents-empty-state";
 import { MicroagentItem } from "./microagent-item";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 
 interface MicroagentsModalProps {
   onClose: () => void;
@@ -18,7 +18,7 @@ interface MicroagentsModalProps {
 
 export function MicroagentsModal({ onClose }: MicroagentsModalProps) {
   const { t } = useTranslation();
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
   const [expandedAgents, setExpandedAgents] = useState<Record<string, boolean>>(
     {},
   );
diff --git a/frontend/src/components/features/conversation-panel/start-task-card/start-task-card-footer.tsx b/frontend/src/components/features/conversation-panel/start-task-card/start-task-card-footer.tsx
new file mode 100644
index 0000000000..a2f9bb4036
--- /dev/null
+++ b/frontend/src/components/features/conversation-panel/start-task-card/start-task-card-footer.tsx
@@ -0,0 +1,46 @@
+import { useTranslation } from "react-i18next";
+import { formatTimeDelta } from "#/utils/format-time-delta";
+import { cn } from "#/utils/utils";
+import { I18nKey } from "#/i18n/declaration";
+import { ConversationRepoLink } from "../conversation-card/conversation-repo-link";
+import { NoRepository } from "../conversation-card/no-repository";
+import type { RepositorySelection } from "#/api/open-hands.types";
+
+interface StartTaskCardFooterProps {
+  selectedRepository: RepositorySelection | null;
+  createdAt: string; // ISO 8601
+  detail: string | null;
+}
+
+export function StartTaskCardFooter({
+  selectedRepository,
+  createdAt,
+  detail,
+}: StartTaskCardFooterProps) {
+  const { t } = useTranslation();
+
+  return (
+    <div className={cn("flex flex-col gap-1 mt-1")}>
+      {/* Repository Info */}
+      <div className="flex flex-row justify-between items-center">
+        {selectedRepository ? (
+          <ConversationRepoLink selectedRepository={selectedRepository} />
+        ) : (
+          <NoRepository />
+        )}
+        {createdAt && (
+          <p className="text-xs text-[#A3A3A3] flex-1 text-right">
+            <time>
+              {`${formatTimeDelta(new Date(createdAt))} ${t(I18nKey.CONVERSATION$AGO)}`}
+            </time>
+          </p>
+        )}
+      </div>
+
+      {/* Task Detail */}
+      {detail && (
+        <div className="text-xs text-neutral-500 truncate">{detail}</div>
+      )}
+    </div>
+  );
+}
diff --git a/frontend/src/components/features/conversation-panel/start-task-card/start-task-card-header.tsx b/frontend/src/components/features/conversation-panel/start-task-card/start-task-card-header.tsx
new file mode 100644
index 0000000000..caa8e8f5e4
--- /dev/null
+++ b/frontend/src/components/features/conversation-panel/start-task-card/start-task-card-header.tsx
@@ -0,0 +1,34 @@
+import type { V1AppConversationStartTaskStatus } from "#/api/conversation-service/v1-conversation-service.types";
+import { ConversationVersionBadge } from "../conversation-card/conversation-version-badge";
+import { StartTaskStatusIndicator } from "./start-task-status-indicator";
+import { StartTaskStatusBadge } from "./start-task-status-badge";
+
+interface StartTaskCardHeaderProps {
+  title: string;
+  taskStatus: V1AppConversationStartTaskStatus;
+}
+
+export function StartTaskCardHeader({
+  title,
+  taskStatus,
+}: StartTaskCardHeaderProps) {
+  return (
+    <div className="flex items-center gap-2 flex-1 min-w-0 overflow-hidden mr-2">
+      {/* Status Indicator */}
+      <div className="flex items-center">
+        <StartTaskStatusIndicator taskStatus={taskStatus} />
+      </div>
+
+      {/* Version Badge - V1 tasks are always V1 */}
+      <ConversationVersionBadge version="V1" />
+
+      {/* Title */}
+      <h3 className="text-sm font-medium text-neutral-100 truncate flex-1">
+        {title}
+      </h3>
+
+      {/* Status Badge */}
+      <StartTaskStatusBadge taskStatus={taskStatus} />
+    </div>
+  );
+}
diff --git a/frontend/src/components/features/conversation-panel/start-task-card/start-task-card.tsx b/frontend/src/components/features/conversation-panel/start-task-card/start-task-card.tsx
new file mode 100644
index 0000000000..f99050bd6b
--- /dev/null
+++ b/frontend/src/components/features/conversation-panel/start-task-card/start-task-card.tsx
@@ -0,0 +1,48 @@
+import { useTranslation } from "react-i18next";
+import type { V1AppConversationStartTask } from "#/api/conversation-service/v1-conversation-service.types";
+import { cn } from "#/utils/utils";
+import { I18nKey } from "#/i18n/declaration";
+import { StartTaskCardHeader } from "./start-task-card-header";
+import { StartTaskCardFooter } from "./start-task-card-footer";
+
+interface StartTaskCardProps {
+  task: V1AppConversationStartTask;
+  onClick?: () => void;
+}
+
+export function StartTaskCard({ task, onClick }: StartTaskCardProps) {
+  const { t } = useTranslation();
+  const title =
+    task.request.title ||
+    task.detail ||
+    t(I18nKey.CONVERSATION$STARTING_CONVERSATION);
+
+  const selectedRepository = task.request.selected_repository
+    ? {
+        selected_repository: task.request.selected_repository,
+        selected_branch: task.request.selected_branch || null,
+        git_provider: task.request.git_provider || null,
+      }
+    : null;
+
+  return (
+    <div
+      data-testid="start-task-card"
+      onClick={onClick}
+      className={cn(
+        "relative h-auto w-full p-3.5 border-b border-neutral-600 cursor-pointer",
+        "hover:bg-[#454545]",
+      )}
+    >
+      <div className="flex items-center justify-between w-full">
+        <StartTaskCardHeader title={title} taskStatus={task.status} />
+      </div>
+
+      <StartTaskCardFooter
+        selectedRepository={selectedRepository}
+        createdAt={task.created_at}
+        detail={task.detail}
+      />
+    </div>
+  );
+}
diff --git a/frontend/src/components/features/conversation-panel/start-task-card/start-task-status-badge.tsx b/frontend/src/components/features/conversation-panel/start-task-card/start-task-status-badge.tsx
new file mode 100644
index 0000000000..1f67a8b2c5
--- /dev/null
+++ b/frontend/src/components/features/conversation-panel/start-task-card/start-task-status-badge.tsx
@@ -0,0 +1,45 @@
+import type { V1AppConversationStartTaskStatus } from "#/api/conversation-service/v1-conversation-service.types";
+import { cn } from "#/utils/utils";
+
+interface StartTaskStatusBadgeProps {
+  taskStatus: V1AppConversationStartTaskStatus;
+}
+
+export function StartTaskStatusBadge({
+  taskStatus,
+}: StartTaskStatusBadgeProps) {
+  // Don't show badge for WORKING status (most common, clutters UI)
+  if (taskStatus === "WORKING") {
+    return null;
+  }
+
+  // Format status for display
+  const formatStatus = (status: string) =>
+    status
+      .toLowerCase()
+      .replace(/_/g, " ")
+      .replace(/\b\w/g, (c) => c.toUpperCase());
+
+  // Get status color
+  const getStatusStyle = () => {
+    switch (taskStatus) {
+      case "READY":
+        return "bg-green-500/10 text-green-400 border-green-500/20";
+      case "ERROR":
+        return "bg-red-500/10 text-red-400 border-red-500/20";
+      default:
+        return "bg-yellow-500/10 text-yellow-400 border-yellow-500/20";
+    }
+  };
+
+  return (
+    <span
+      className={cn(
+        "text-xs font-medium px-2 py-0.5 rounded border flex-shrink-0",
+        getStatusStyle(),
+      )}
+    >
+      {formatStatus(taskStatus)}
+    </span>
+  );
+}
diff --git a/frontend/src/components/features/conversation-panel/start-task-card/start-task-status-indicator.tsx b/frontend/src/components/features/conversation-panel/start-task-card/start-task-status-indicator.tsx
new file mode 100644
index 0000000000..958b173d4c
--- /dev/null
+++ b/frontend/src/components/features/conversation-panel/start-task-card/start-task-status-indicator.tsx
@@ -0,0 +1,35 @@
+import type { V1AppConversationStartTaskStatus } from "#/api/conversation-service/v1-conversation-service.types";
+import { cn } from "#/utils/utils";
+
+interface StartTaskStatusIndicatorProps {
+  taskStatus: V1AppConversationStartTaskStatus;
+}
+
+export function StartTaskStatusIndicator({
+  taskStatus,
+}: StartTaskStatusIndicatorProps) {
+  const getStatusColor = () => {
+    switch (taskStatus) {
+      case "READY":
+        return "bg-green-500";
+      case "ERROR":
+        return "bg-red-500";
+      case "WORKING":
+      case "WAITING_FOR_SANDBOX":
+      case "PREPARING_REPOSITORY":
+      case "RUNNING_SETUP_SCRIPT":
+      case "SETTING_UP_GIT_HOOKS":
+      case "STARTING_CONVERSATION":
+        return "bg-yellow-500 animate-pulse";
+      default:
+        return "bg-gray-500";
+    }
+  };
+
+  return (
+    <div
+      className={cn("w-2 h-2 rounded-full flex-shrink-0", getStatusColor())}
+      aria-label={`Task status: ${taskStatus}`}
+    />
+  );
+}
diff --git a/frontend/src/components/features/conversation/conversation-name.tsx b/frontend/src/components/features/conversation/conversation-name.tsx
index c63878d300..127a63582d 100644
--- a/frontend/src/components/features/conversation/conversation-name.tsx
+++ b/frontend/src/components/features/conversation/conversation-name.tsx
@@ -13,6 +13,7 @@ import { MicroagentsModal } from "../conversation-panel/microagents-modal";
 import { ConfirmDeleteModal } from "../conversation-panel/confirm-delete-modal";
 import { ConfirmStopModal } from "../conversation-panel/confirm-stop-modal";
 import { MetricsModal } from "./metrics-modal/metrics-modal";
+import { ConversationVersionBadge } from "../conversation-panel/conversation-card/conversation-version-badge";
 
 export function ConversationName() {
   const { t } = useTranslation();
@@ -148,6 +149,12 @@ export function ConversationName() {
           </div>
         )}
 
+        {titleMode !== "edit" && (
+          <ConversationVersionBadge
+            version={conversation.conversation_version}
+          />
+        )}
+
         {titleMode !== "edit" && (
           <div className="relative flex items-center">
             <EllipsisButton fill="#B1B9D3" onClick={handleEllipsisClick} />
diff --git a/frontend/src/components/features/conversation/conversation-tabs/vscode-tooltip-content.tsx b/frontend/src/components/features/conversation/conversation-tabs/vscode-tooltip-content.tsx
index fe7f4f1730..400340b11e 100644
--- a/frontend/src/components/features/conversation/conversation-tabs/vscode-tooltip-content.tsx
+++ b/frontend/src/components/features/conversation/conversation-tabs/vscode-tooltip-content.tsx
@@ -5,10 +5,10 @@ import { RUNTIME_INACTIVE_STATES } from "#/types/agent-state";
 import { transformVSCodeUrl } from "#/utils/vscode-url-helper";
 import { useConversationId } from "#/hooks/use-conversation-id";
 import ConversationService from "#/api/conversation-service/conversation-service.api";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 
 export function VSCodeTooltipContent() {
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
 
   const { t } = useTranslation();
   const { conversationId } = useConversationId();
diff --git a/frontend/src/components/features/jupyter/jupyter.tsx b/frontend/src/components/features/jupyter/jupyter.tsx
index 487e71afd7..5ff84c7f2f 100644
--- a/frontend/src/components/features/jupyter/jupyter.tsx
+++ b/frontend/src/components/features/jupyter/jupyter.tsx
@@ -7,7 +7,7 @@ import { RUNTIME_INACTIVE_STATES } from "#/types/agent-state";
 import { I18nKey } from "#/i18n/declaration";
 import JupyterLargeIcon from "#/icons/jupyter-large.svg?react";
 import { WaitingForRuntimeMessage } from "../chat/waiting-for-runtime-message";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 import { useJupyterStore } from "#/state/jupyter-store";
 
 interface JupyterEditorProps {
@@ -15,7 +15,7 @@ interface JupyterEditorProps {
 }
 
 export function JupyterEditor({ maxWidth }: JupyterEditorProps) {
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
 
   const cells = useJupyterStore((state) => state.cells);
 
diff --git a/frontend/src/components/features/terminal/terminal.tsx b/frontend/src/components/features/terminal/terminal.tsx
index 6afa506177..33c884ecd3 100644
--- a/frontend/src/components/features/terminal/terminal.tsx
+++ b/frontend/src/components/features/terminal/terminal.tsx
@@ -3,10 +3,10 @@ import "@xterm/xterm/css/xterm.css";
 import { RUNTIME_INACTIVE_STATES } from "#/types/agent-state";
 import { cn } from "#/utils/utils";
 import { WaitingForRuntimeMessage } from "../chat/waiting-for-runtime-message";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 
 function Terminal() {
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
 
   const isRuntimeInactive = RUNTIME_INACTIVE_STATES.includes(curAgentState);
 
diff --git a/frontend/src/components/shared/buttons/confirmation-buttons.tsx b/frontend/src/components/shared/buttons/confirmation-buttons.tsx
index c3fbddaa19..170269736a 100644
--- a/frontend/src/components/shared/buttons/confirmation-buttons.tsx
+++ b/frontend/src/components/shared/buttons/confirmation-buttons.tsx
@@ -3,7 +3,6 @@ import { useTranslation } from "react-i18next";
 import { I18nKey } from "#/i18n/declaration";
 import { AgentState } from "#/types/agent-state";
 import { generateAgentStateChangeEvent } from "#/services/agent-state-service";
-import { useWsClient } from "#/context/ws-client-provider";
 import { ActionTooltip } from "../action-tooltip";
 import { isOpenHandsAction, isActionOrObservation } from "#/types/core/guards";
 import { ActionSecurityRisk } from "#/stores/security-analyzer-store";
@@ -12,6 +11,7 @@ import WarningIcon from "#/icons/u-warning.svg?react";
 import { useEventMessageStore } from "#/stores/event-message-store";
 import { useEventStore } from "#/stores/use-event-store";
 import { isV0Event } from "#/types/v1/type-guards";
+import { useSendMessage } from "#/hooks/use-send-message";
 
 export function ConfirmationButtons() {
   const submittedEventIds = useEventMessageStore(
@@ -23,7 +23,7 @@ export function ConfirmationButtons() {
 
   const { t } = useTranslation();
 
-  const { send } = useWsClient();
+  const { send } = useSendMessage();
   const events = useEventStore((state) => state.events);
 
   // Find the most recent action awaiting confirmation
diff --git a/frontend/src/components/v1/chat/event-content-helpers/get-action-content.ts b/frontend/src/components/v1/chat/event-content-helpers/get-action-content.ts
new file mode 100644
index 0000000000..fe6bf842c3
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-content-helpers/get-action-content.ts
@@ -0,0 +1,198 @@
+import { ActionEvent } from "#/types/v1/core";
+import { getDefaultEventContent, MAX_CONTENT_LENGTH } from "./shared";
+import i18n from "#/i18n";
+import { SecurityRisk } from "#/types/v1/core/base/common";
+import {
+  ExecuteBashAction,
+  FileEditorAction,
+  StrReplaceEditorAction,
+  MCPToolAction,
+  ThinkAction,
+  FinishAction,
+  TaskTrackerAction,
+  BrowserNavigateAction,
+  BrowserClickAction,
+  BrowserTypeAction,
+  BrowserGetStateAction,
+  BrowserGetContentAction,
+  BrowserScrollAction,
+  BrowserGoBackAction,
+  BrowserListTabsAction,
+  BrowserSwitchTabAction,
+  BrowserCloseTabAction,
+} from "#/types/v1/core/base/action";
+
+const getRiskText = (risk: SecurityRisk) => {
+  switch (risk) {
+    case SecurityRisk.LOW:
+      return i18n.t("SECURITY$LOW_RISK");
+    case SecurityRisk.MEDIUM:
+      return i18n.t("SECURITY$MEDIUM_RISK");
+    case SecurityRisk.HIGH:
+      return i18n.t("SECURITY$HIGH_RISK");
+    case SecurityRisk.UNKNOWN:
+    default:
+      return i18n.t("SECURITY$UNKNOWN_RISK");
+  }
+};
+
+const getNoContentActionContent = (): string => "";
+
+// File Editor Actions
+const getFileEditorActionContent = (
+  action: FileEditorAction | StrReplaceEditorAction,
+): string => {
+  // Early return if not a create command or no file text
+  if (action.command !== "create" || !action.file_text) {
+    return getNoContentActionContent();
+  }
+
+  // Process file text with length truncation
+  let fileText = action.file_text;
+  if (fileText.length > MAX_CONTENT_LENGTH) {
+    fileText = `${fileText.slice(0, MAX_CONTENT_LENGTH)}...`;
+  }
+
+  return `${action.path}\n${fileText}`;
+};
+
+// Command Actions
+const getExecuteBashActionContent = (
+  event: ActionEvent<ExecuteBashAction>,
+): string => {
+  let content = `Command:\n\`${event.action.command}\``;
+
+  // Add security risk information if it's HIGH or MEDIUM
+  if (
+    event.security_risk === SecurityRisk.HIGH ||
+    event.security_risk === SecurityRisk.MEDIUM
+  ) {
+    content += `\n\n${getRiskText(event.security_risk)}`;
+  }
+
+  return content;
+};
+
+// Tool Actions
+const getMCPToolActionContent = (action: MCPToolAction): string => {
+  // For V1, the tool name is in the event's tool_name property, not in the action
+  let details = `**MCP Tool Call**\n\n`;
+  details += `**Arguments:**\n\`\`\`json\n${JSON.stringify(action.data, null, 2)}\n\`\`\``;
+  return details;
+};
+
+// Simple Actions
+const getThinkActionContent = (action: ThinkAction): string => action.thought;
+
+const getFinishActionContent = (action: FinishAction): string =>
+  action.message.trim();
+
+// Complex Actions
+const getTaskTrackerActionContent = (action: TaskTrackerAction): string => {
+  let content = `**Command:** \`${action.command}\``;
+
+  // Handle plan command with task list
+  if (action.command === "plan") {
+    if (action.task_list && action.task_list.length > 0) {
+      content += `\n\n**Task List (${action.task_list.length} ${action.task_list.length === 1 ? "item" : "items"}):**\n`;
+      action.task_list.forEach((task, index: number) => {
+        const statusMap = {
+          todo: "⏳",
+          in_progress: "🔄",
+          done: "✅",
+        };
+        const statusIcon =
+          statusMap[task.status as keyof typeof statusMap] || "❓";
+        content += `\n${index + 1}. ${statusIcon} **[${task.status.toUpperCase().replace("_", " ")}]** ${task.title}`;
+        if (task.notes) {
+          content += `\n   *Notes: ${task.notes}*`;
+        }
+      });
+    } else {
+      content += "\n\n**Task List:** Empty";
+    }
+  }
+
+  return content;
+};
+
+// Browser Actions
+type BrowserAction =
+  | BrowserNavigateAction
+  | BrowserClickAction
+  | BrowserTypeAction
+  | BrowserGetStateAction
+  | BrowserGetContentAction
+  | BrowserScrollAction
+  | BrowserGoBackAction
+  | BrowserListTabsAction
+  | BrowserSwitchTabAction
+  | BrowserCloseTabAction;
+
+const getBrowserActionContent = (action: BrowserAction): string => {
+  switch (action.kind) {
+    case "BrowserNavigateAction":
+      if ("url" in action) {
+        return `Browsing ${action.url}`;
+      }
+      break;
+    case "BrowserClickAction":
+    case "BrowserTypeAction":
+    case "BrowserGetStateAction":
+    case "BrowserGetContentAction":
+    case "BrowserScrollAction":
+    case "BrowserGoBackAction":
+    case "BrowserListTabsAction":
+    case "BrowserSwitchTabAction":
+    case "BrowserCloseTabAction":
+      // These browser actions typically don't need detailed content display
+      return getNoContentActionContent();
+    default:
+      return getNoContentActionContent();
+  }
+
+  return getNoContentActionContent();
+};
+
+export const getActionContent = (event: ActionEvent): string => {
+  const { action } = event;
+  const actionType = action.kind;
+
+  switch (actionType) {
+    case "FileEditorAction":
+    case "StrReplaceEditorAction":
+      return getFileEditorActionContent(action);
+
+    case "ExecuteBashAction":
+      return getExecuteBashActionContent(
+        event as ActionEvent<ExecuteBashAction>,
+      );
+
+    case "MCPToolAction":
+      return getMCPToolActionContent(action);
+
+    case "ThinkAction":
+      return getThinkActionContent(action);
+
+    case "FinishAction":
+      return getFinishActionContent(action);
+
+    case "TaskTrackerAction":
+      return getTaskTrackerActionContent(action);
+
+    case "BrowserNavigateAction":
+    case "BrowserClickAction":
+    case "BrowserTypeAction":
+    case "BrowserGetStateAction":
+    case "BrowserGetContentAction":
+    case "BrowserScrollAction":
+    case "BrowserGoBackAction":
+    case "BrowserListTabsAction":
+    case "BrowserSwitchTabAction":
+    case "BrowserCloseTabAction":
+      return getBrowserActionContent(action);
+
+    default:
+      return getDefaultEventContent(event);
+  }
+};
diff --git a/frontend/src/components/v1/chat/event-content-helpers/get-event-content.tsx b/frontend/src/components/v1/chat/event-content-helpers/get-event-content.tsx
new file mode 100644
index 0000000000..c1f36843de
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-content-helpers/get-event-content.tsx
@@ -0,0 +1,168 @@
+import { Trans } from "react-i18next";
+import { OpenHandsEvent } from "#/types/v1/core";
+import { isActionEvent, isObservationEvent } from "#/types/v1/type-guards";
+import { MonoComponent } from "../../../features/chat/mono-component";
+import { PathComponent } from "../../../features/chat/path-component";
+import { getActionContent } from "./get-action-content";
+import { getObservationContent } from "./get-observation-content";
+import i18n from "#/i18n";
+
+const trimText = (text: string, maxLength: number): string => {
+  if (!text) return "";
+  return text.length > maxLength ? `${text.substring(0, maxLength)}...` : text;
+};
+
+// Helper function to create title from translation key
+const createTitleFromKey = (
+  key: string,
+  values: Record<string, unknown>,
+): React.ReactNode => {
+  if (!i18n.exists(key)) {
+    return key;
+  }
+
+  return (
+    <Trans
+      i18nKey={key}
+      values={values}
+      components={{
+        path: <PathComponent />,
+        cmd: <MonoComponent />,
+      }}
+    />
+  );
+};
+
+// Action Event Processing
+const getActionEventTitle = (event: OpenHandsEvent): React.ReactNode => {
+  // Early return if not an action event
+  if (!isActionEvent(event)) {
+    return "";
+  }
+
+  const actionType = event.action.kind;
+  let actionKey = "";
+  let actionValues: Record<string, unknown> = {};
+
+  switch (actionType) {
+    case "ExecuteBashAction":
+      actionKey = "ACTION_MESSAGE$RUN";
+      actionValues = {
+        command: trimText(event.action.command, 80),
+      };
+      break;
+    case "FileEditorAction":
+    case "StrReplaceEditorAction":
+      if (event.action.command === "view") {
+        actionKey = "ACTION_MESSAGE$READ";
+      } else if (event.action.command === "create") {
+        actionKey = "ACTION_MESSAGE$WRITE";
+      } else {
+        actionKey = "ACTION_MESSAGE$EDIT";
+      }
+      actionValues = {
+        path: event.action.path,
+      };
+      break;
+    case "MCPToolAction":
+      actionKey = "ACTION_MESSAGE$CALL_TOOL_MCP";
+      actionValues = {
+        mcp_tool_name: event.tool_name,
+      };
+      break;
+    case "ThinkAction":
+      actionKey = "ACTION_MESSAGE$THINK";
+      break;
+    case "FinishAction":
+      actionKey = "ACTION_MESSAGE$FINISH";
+      break;
+    case "TaskTrackerAction":
+      actionKey = "ACTION_MESSAGE$TASK_TRACKING";
+      break;
+    case "BrowserNavigateAction":
+      actionKey = "ACTION_MESSAGE$BROWSE";
+      break;
+    default:
+      // For unknown actions, use the type name
+      return actionType.replace("Action", "").toUpperCase();
+  }
+
+  if (actionKey) {
+    return createTitleFromKey(actionKey, actionValues);
+  }
+
+  return actionType;
+};
+
+// Observation Event Processing
+const getObservationEventTitle = (event: OpenHandsEvent): React.ReactNode => {
+  // Early return if not an observation event
+  if (!isObservationEvent(event)) {
+    return "";
+  }
+
+  const observationType = event.observation.kind;
+  let observationKey = "";
+  let observationValues: Record<string, unknown> = {};
+
+  switch (observationType) {
+    case "ExecuteBashObservation":
+      observationKey = "OBSERVATION_MESSAGE$RUN";
+      observationValues = {
+        command: event.observation.command
+          ? trimText(event.observation.command, 80)
+          : "",
+      };
+      break;
+    case "FileEditorObservation":
+    case "StrReplaceEditorObservation":
+      if (event.observation.command === "view") {
+        observationKey = "OBSERVATION_MESSAGE$READ";
+      } else {
+        observationKey = "OBSERVATION_MESSAGE$EDIT";
+      }
+      observationValues = {
+        path: event.observation.path || "",
+      };
+      break;
+    case "MCPToolObservation":
+      observationKey = "OBSERVATION_MESSAGE$MCP";
+      observationValues = {
+        mcp_tool_name: event.observation.tool_name,
+      };
+      break;
+    case "BrowserObservation":
+      observationKey = "OBSERVATION_MESSAGE$BROWSE";
+      break;
+    case "TaskTrackerObservation":
+      observationKey = "OBSERVATION_MESSAGE$TASK_TRACKING";
+      break;
+    default:
+      // For unknown observations, use the type name
+      return observationType.replace("Observation", "").toUpperCase();
+  }
+
+  if (observationKey) {
+    return createTitleFromKey(observationKey, observationValues);
+  }
+
+  return observationType;
+};
+
+export const getEventContent = (event: OpenHandsEvent) => {
+  let title: React.ReactNode = "";
+  let details: string = "";
+
+  if (isActionEvent(event)) {
+    title = getActionEventTitle(event);
+    details = getActionContent(event);
+  } else if (isObservationEvent(event)) {
+    title = getObservationEventTitle(event);
+    details = getObservationContent(event);
+  }
+
+  return {
+    title: title || i18n.t("EVENT$UNKNOWN_EVENT"),
+    details: details || i18n.t("EVENT$UNKNOWN_EVENT"),
+  };
+};
diff --git a/frontend/src/components/v1/chat/event-content-helpers/get-observation-content.ts b/frontend/src/components/v1/chat/event-content-helpers/get-observation-content.ts
new file mode 100644
index 0000000000..03e35ea9e9
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-content-helpers/get-observation-content.ts
@@ -0,0 +1,203 @@
+import { ObservationEvent } from "#/types/v1/core";
+import { getObservationResult } from "./get-observation-result";
+import { getDefaultEventContent, MAX_CONTENT_LENGTH } from "./shared";
+import i18n from "#/i18n";
+import {
+  MCPToolObservation,
+  FinishObservation,
+  ThinkObservation,
+  BrowserObservation,
+  ExecuteBashObservation,
+  FileEditorObservation,
+  StrReplaceEditorObservation,
+  TaskTrackerObservation,
+} from "#/types/v1/core/base/observation";
+
+// File Editor Observations
+const getFileEditorObservationContent = (
+  event: ObservationEvent<FileEditorObservation | StrReplaceEditorObservation>,
+): string => {
+  const { observation } = event;
+
+  const successMessage = getObservationResult(event) === "success";
+
+  // For view commands or successful edits with content changes, format as code block
+  if (
+    (successMessage &&
+      "old_content" in observation &&
+      "new_content" in observation &&
+      observation.old_content &&
+      observation.new_content) ||
+    observation.command === "view"
+  ) {
+    return `\`\`\`\n${observation.output}\n\`\`\``;
+  }
+
+  // For other commands, return the output as-is
+  return observation.output;
+};
+
+// Command Observations
+const getExecuteBashObservationContent = (
+  event: ObservationEvent<ExecuteBashObservation>,
+): string => {
+  const { observation } = event;
+
+  let { output } = observation;
+
+  if (output.length > MAX_CONTENT_LENGTH) {
+    output = `${output.slice(0, MAX_CONTENT_LENGTH)}...`;
+  }
+
+  return `Output:\n\`\`\`sh\n${output.trim() || i18n.t("OBSERVATION$COMMAND_NO_OUTPUT")}\n\`\`\``;
+};
+
+// Tool Observations
+const getBrowserObservationContent = (
+  event: ObservationEvent<BrowserObservation>,
+): string => {
+  const { observation } = event;
+
+  let contentDetails = "";
+
+  if ("error" in observation && observation.error) {
+    contentDetails += `**Error:**\n${observation.error}\n\n`;
+  }
+
+  contentDetails += `**Output:**\n${observation.output}`;
+
+  if (contentDetails.length > MAX_CONTENT_LENGTH) {
+    contentDetails = `${contentDetails.slice(0, MAX_CONTENT_LENGTH)}...(truncated)`;
+  }
+
+  return contentDetails;
+};
+
+const getMCPToolObservationContent = (
+  event: ObservationEvent<MCPToolObservation>,
+): string => {
+  const { observation } = event;
+
+  // Extract text content from the observation
+  const textContent = observation.content
+    .filter((c) => c.type === "text")
+    .map((c) => c.text)
+    .join("\n");
+
+  let content = `**Tool:** ${observation.tool_name}\n\n`;
+
+  if (observation.is_error) {
+    content += `**Error:**\n${textContent}`;
+  } else {
+    content += `**Result:**\n${textContent}`;
+  }
+
+  if (content.length > MAX_CONTENT_LENGTH) {
+    content = `${content.slice(0, MAX_CONTENT_LENGTH)}...`;
+  }
+
+  return content;
+};
+
+// Complex Observations
+const getTaskTrackerObservationContent = (
+  event: ObservationEvent<TaskTrackerObservation>,
+): string => {
+  const { observation } = event;
+
+  const { command, task_list: taskList } = observation;
+  let content = `**Command:** \`${command}\``;
+
+  if (command === "plan" && taskList.length > 0) {
+    content += `\n\n**Task List (${taskList.length} ${taskList.length === 1 ? "item" : "items"}):**\n`;
+
+    taskList.forEach((task, index: number) => {
+      const statusMap = {
+        todo: "⏳",
+        in_progress: "🔄",
+        done: "✅",
+      };
+      const statusIcon =
+        statusMap[task.status as keyof typeof statusMap] || "❓";
+
+      content += `\n${index + 1}. ${statusIcon} **[${task.status.toUpperCase().replace("_", " ")}]** ${task.title}`;
+      if (task.notes) {
+        content += `\n   *Notes: ${task.notes}*`;
+      }
+    });
+  } else if (command === "plan") {
+    content += "\n\n**Task List:** Empty";
+  }
+
+  if (
+    "content" in observation &&
+    observation.content &&
+    observation.content.trim()
+  ) {
+    content += `\n\n**Result:** ${observation.content.trim()}`;
+  }
+
+  return content;
+};
+
+// Simple Observations
+const getThinkObservationContent = (
+  event: ObservationEvent<ThinkObservation>,
+): string => {
+  const { observation } = event;
+  return observation.content || "";
+};
+
+const getFinishObservationContent = (
+  event: ObservationEvent<FinishObservation>,
+): string => {
+  const { observation } = event;
+  return observation.message || "";
+};
+
+export const getObservationContent = (event: ObservationEvent): string => {
+  const observationType = event.observation.kind;
+
+  switch (observationType) {
+    case "FileEditorObservation":
+    case "StrReplaceEditorObservation":
+      return getFileEditorObservationContent(
+        event as ObservationEvent<
+          FileEditorObservation | StrReplaceEditorObservation
+        >,
+      );
+
+    case "ExecuteBashObservation":
+      return getExecuteBashObservationContent(
+        event as ObservationEvent<ExecuteBashObservation>,
+      );
+
+    case "BrowserObservation":
+      return getBrowserObservationContent(
+        event as ObservationEvent<BrowserObservation>,
+      );
+
+    case "MCPToolObservation":
+      return getMCPToolObservationContent(
+        event as ObservationEvent<MCPToolObservation>,
+      );
+
+    case "TaskTrackerObservation":
+      return getTaskTrackerObservationContent(
+        event as ObservationEvent<TaskTrackerObservation>,
+      );
+
+    case "ThinkObservation":
+      return getThinkObservationContent(
+        event as ObservationEvent<ThinkObservation>,
+      );
+
+    case "FinishObservation":
+      return getFinishObservationContent(
+        event as ObservationEvent<FinishObservation>,
+      );
+
+    default:
+      return getDefaultEventContent(event);
+  }
+};
diff --git a/frontend/src/components/v1/chat/event-content-helpers/get-observation-result.ts b/frontend/src/components/v1/chat/event-content-helpers/get-observation-result.ts
new file mode 100644
index 0000000000..032e8823de
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-content-helpers/get-observation-result.ts
@@ -0,0 +1,30 @@
+import { ObservationEvent } from "#/types/v1/core";
+
+export type ObservationResultStatus = "success" | "error" | "timeout";
+
+export const getObservationResult = (
+  event: ObservationEvent,
+): ObservationResultStatus => {
+  const { observation } = event;
+  const observationType = observation.kind;
+
+  switch (observationType) {
+    case "ExecuteBashObservation": {
+      const exitCode = observation.exit_code;
+
+      if (exitCode === -1) return "timeout"; // Command timed out
+      if (exitCode === 0) return "success"; // Command executed successfully
+      return "error"; // Command failed
+    }
+    case "FileEditorObservation":
+    case "StrReplaceEditorObservation":
+      // Check if there's an error
+      if (observation.error) return "error";
+      return "success";
+    case "MCPToolObservation":
+      if (observation.is_error) return "error";
+      return "success";
+    default:
+      return "success";
+  }
+};
diff --git a/frontend/src/components/v1/chat/event-content-helpers/parse-message-from-event.ts b/frontend/src/components/v1/chat/event-content-helpers/parse-message-from-event.ts
new file mode 100644
index 0000000000..17824a51c8
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-content-helpers/parse-message-from-event.ts
@@ -0,0 +1,41 @@
+import { MessageEvent } from "#/types/v1/core";
+import i18n from "#/i18n";
+
+export const parseMessageFromEvent = (event: MessageEvent): string => {
+  const message = event.llm_message;
+
+  // Safety check: ensure llm_message exists and has content
+  if (!message || !message.content) {
+    return "";
+  }
+
+  // Get the text content from the message
+  let textContent = "";
+  if (message.content) {
+    if (Array.isArray(message.content)) {
+      // Handle array of content blocks
+      textContent = message.content
+        .filter((content) => content.type === "text")
+        .map((content) => content.text)
+        .join("\n");
+    } else if (typeof message.content === "string") {
+      // Handle string content
+      textContent = message.content;
+    }
+  }
+
+  // Check if there are image_urls in the message content
+  const hasImages =
+    Array.isArray(message.content) &&
+    message.content.some((content) => content.type === "image");
+
+  if (!hasImages) {
+    return textContent;
+  }
+
+  // If there are images, try to split by the augmented prompt delimiter
+  const delimiter = i18n.t("CHAT_INTERFACE$AUGMENTED_PROMPT_FILES_TITLE");
+  const parts = textContent.split(delimiter);
+
+  return parts[0];
+};
diff --git a/frontend/src/components/v1/chat/event-content-helpers/shared.ts b/frontend/src/components/v1/chat/event-content-helpers/shared.ts
new file mode 100644
index 0000000000..717de7a391
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-content-helpers/shared.ts
@@ -0,0 +1,6 @@
+import { OpenHandsEvent } from "#/types/v1/core";
+
+export const MAX_CONTENT_LENGTH = 1000;
+
+export const getDefaultEventContent = (event: OpenHandsEvent): string =>
+  `\`\`\`json\n${JSON.stringify(event, null, 2)}\n\`\`\``;
diff --git a/frontend/src/components/v1/chat/event-content-helpers/should-render-event.ts b/frontend/src/components/v1/chat/event-content-helpers/should-render-event.ts
new file mode 100644
index 0000000000..8acef2da03
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-content-helpers/should-render-event.ts
@@ -0,0 +1,66 @@
+import { OpenHandsEvent } from "#/types/v1/core";
+import {
+  isActionEvent,
+  isObservationEvent,
+  isMessageEvent,
+  isAgentErrorEvent,
+  isConversationStateUpdateEvent,
+} from "#/types/v1/type-guards";
+
+// V1 events that should not be rendered
+const NO_RENDER_ACTION_TYPES = [
+  "ThinkAction",
+  // Add more action types that should not be rendered
+];
+
+const NO_RENDER_OBSERVATION_TYPES = [
+  "ThinkObservation",
+  // Add more observation types that should not be rendered
+];
+
+export const shouldRenderEvent = (event: OpenHandsEvent) => {
+  // Explicitly exclude system events that should not be rendered in chat
+  if (isConversationStateUpdateEvent(event)) {
+    return false;
+  }
+
+  // Render action events (with filtering)
+  if (isActionEvent(event)) {
+    // For V1, action is an object with kind property
+    const actionType = event.action.kind;
+
+    // Hide user commands from the chat interface
+    if (actionType === "ExecuteBashAction" && event.source === "user") {
+      return false;
+    }
+
+    return !NO_RENDER_ACTION_TYPES.includes(actionType);
+  }
+
+  // Render observation events (with filtering)
+  if (isObservationEvent(event)) {
+    // For V1, observation is an object with kind property
+    const observationType = event.observation.kind;
+
+    // Note: ObservationEvent source is always "environment", not "user"
+    // So no need to check for user source here
+
+    return !NO_RENDER_OBSERVATION_TYPES.includes(observationType);
+  }
+
+  // Render message events (user and assistant messages)
+  if (isMessageEvent(event)) {
+    return true;
+  }
+
+  // Render agent error events
+  if (isAgentErrorEvent(event)) {
+    return true;
+  }
+
+  // Don't render any other event types (system events, etc.)
+  return false;
+};
+
+export const hasUserEvent = (events: OpenHandsEvent[]) =>
+  events.some((event) => event.source === "user");
diff --git a/frontend/src/components/v1/chat/event-message-components/error-event-message.tsx b/frontend/src/components/v1/chat/event-message-components/error-event-message.tsx
new file mode 100644
index 0000000000..98ae2b23c6
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-message-components/error-event-message.tsx
@@ -0,0 +1,49 @@
+import React from "react";
+import { AgentErrorEvent } from "#/types/v1/core";
+import { isAgentErrorEvent } from "#/types/v1/type-guards";
+import { ErrorMessage } from "../../../features/chat/error-message";
+import { MicroagentStatusWrapper } from "../../../features/chat/event-message-components/microagent-status-wrapper";
+// TODO: Implement V1 LikertScaleWrapper when API supports V1 event IDs
+// import { LikertScaleWrapper } from "../../../features/chat/event-message-components/likert-scale-wrapper";
+import { MicroagentStatus } from "#/types/microagent-status";
+
+interface ErrorEventMessageProps {
+  event: AgentErrorEvent;
+  microagentStatus?: MicroagentStatus | null;
+  microagentConversationId?: string;
+  microagentPRUrl?: string;
+  actions?: Array<{
+    icon: React.ReactNode;
+    onClick: () => void;
+    tooltip?: string;
+  }>;
+}
+
+export function ErrorEventMessage({
+  event,
+  microagentStatus,
+  microagentConversationId,
+  microagentPRUrl,
+  actions,
+}: ErrorEventMessageProps) {
+  if (!isAgentErrorEvent(event)) {
+    return null;
+  }
+
+  return (
+    <div>
+      <ErrorMessage
+        // V1 doesn't have error_id, use event.id instead
+        errorId={event.id}
+        defaultMessage={event.error}
+      />
+      <MicroagentStatusWrapper
+        microagentStatus={microagentStatus}
+        microagentConversationId={microagentConversationId}
+        microagentPRUrl={microagentPRUrl}
+        actions={actions}
+      />
+      {/* LikertScaleWrapper expects V0 event types, skip for now */}
+    </div>
+  );
+}
diff --git a/frontend/src/components/v1/chat/event-message-components/finish-event-message.tsx b/frontend/src/components/v1/chat/event-message-components/finish-event-message.tsx
new file mode 100644
index 0000000000..6ad385e8f0
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-message-components/finish-event-message.tsx
@@ -0,0 +1,46 @@
+import React from "react";
+import { ActionEvent } from "#/types/v1/core";
+import { FinishAction } from "#/types/v1/core/base/action";
+import { ChatMessage } from "../../../features/chat/chat-message";
+import { MicroagentStatusWrapper } from "../../../features/chat/event-message-components/microagent-status-wrapper";
+// TODO: Implement V1 LikertScaleWrapper when API supports V1 event IDs
+// import { LikertScaleWrapper } from "../../../features/chat/event-message-components/likert-scale-wrapper";
+import { getEventContent } from "../event-content-helpers/get-event-content";
+import { MicroagentStatus } from "#/types/microagent-status";
+
+interface FinishEventMessageProps {
+  event: ActionEvent<FinishAction>;
+  microagentStatus?: MicroagentStatus | null;
+  microagentConversationId?: string;
+  microagentPRUrl?: string;
+  actions?: Array<{
+    icon: React.ReactNode;
+    onClick: () => void;
+    tooltip?: string;
+  }>;
+}
+
+export function FinishEventMessage({
+  event,
+  microagentStatus,
+  microagentConversationId,
+  microagentPRUrl,
+  actions,
+}: FinishEventMessageProps) {
+  return (
+    <>
+      <ChatMessage
+        type="agent"
+        message={getEventContent(event).details}
+        actions={actions}
+      />
+      <MicroagentStatusWrapper
+        microagentStatus={microagentStatus}
+        microagentConversationId={microagentConversationId}
+        microagentPRUrl={microagentPRUrl}
+        actions={actions}
+      />
+      {/* LikertScaleWrapper expects V0 event types, skip for now */}
+    </>
+  );
+}
diff --git a/frontend/src/components/v1/chat/event-message-components/generic-event-message-wrapper.tsx b/frontend/src/components/v1/chat/event-message-components/generic-event-message-wrapper.tsx
new file mode 100644
index 0000000000..c2ac1d9a73
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-message-components/generic-event-message-wrapper.tsx
@@ -0,0 +1,33 @@
+import React from "react";
+import { OpenHandsEvent } from "#/types/v1/core";
+import { GenericEventMessage } from "../../../features/chat/generic-event-message";
+import { getEventContent } from "../event-content-helpers/get-event-content";
+import { getObservationResult } from "../event-content-helpers/get-observation-result";
+import { isObservationEvent } from "#/types/v1/type-guards";
+import { ConfirmationButtons } from "#/components/shared/buttons/confirmation-buttons";
+
+interface GenericEventMessageWrapperProps {
+  event: OpenHandsEvent;
+  shouldShowConfirmationButtons: boolean;
+}
+
+export function GenericEventMessageWrapper({
+  event,
+  shouldShowConfirmationButtons,
+}: GenericEventMessageWrapperProps) {
+  const { title, details } = getEventContent(event);
+
+  return (
+    <div>
+      <GenericEventMessage
+        title={title}
+        details={details}
+        success={
+          isObservationEvent(event) ? getObservationResult(event) : undefined
+        }
+        initiallyExpanded={false}
+      />
+      {shouldShowConfirmationButtons && <ConfirmationButtons />}
+    </div>
+  );
+}
diff --git a/frontend/src/components/v1/chat/event-message-components/index.ts b/frontend/src/components/v1/chat/event-message-components/index.ts
new file mode 100644
index 0000000000..1f705a1f7a
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-message-components/index.ts
@@ -0,0 +1,5 @@
+export { UserAssistantEventMessage } from "./user-assistant-event-message";
+export { ObservationPairEventMessage } from "./observation-pair-event-message";
+export { ErrorEventMessage } from "./error-event-message";
+export { FinishEventMessage } from "./finish-event-message";
+export { GenericEventMessageWrapper } from "./generic-event-message-wrapper";
diff --git a/frontend/src/components/v1/chat/event-message-components/observation-pair-event-message.tsx b/frontend/src/components/v1/chat/event-message-components/observation-pair-event-message.tsx
new file mode 100644
index 0000000000..aa0bbc09b4
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-message-components/observation-pair-event-message.tsx
@@ -0,0 +1,59 @@
+import React from "react";
+import { ActionEvent } from "#/types/v1/core";
+import { isActionEvent } from "#/types/v1/type-guards";
+import { ChatMessage } from "../../../features/chat/chat-message";
+import { MicroagentStatusWrapper } from "../../../features/chat/event-message-components/microagent-status-wrapper";
+import { MicroagentStatus } from "#/types/microagent-status";
+
+interface ObservationPairEventMessageProps {
+  event: ActionEvent;
+  microagentStatus?: MicroagentStatus | null;
+  microagentConversationId?: string;
+  microagentPRUrl?: string;
+  actions?: Array<{
+    icon: React.ReactNode;
+    onClick: () => void;
+    tooltip?: string;
+  }>;
+}
+
+export function ObservationPairEventMessage({
+  event,
+  microagentStatus,
+  microagentConversationId,
+  microagentPRUrl,
+  actions,
+}: ObservationPairEventMessageProps) {
+  if (!isActionEvent(event)) {
+    return null;
+  }
+
+  // Check if there's thought content to display
+  const thoughtContent = event.thought
+    .filter((t) => t.type === "text")
+    .map((t) => t.text)
+    .join("\n");
+
+  if (thoughtContent && event.action.kind !== "ThinkAction") {
+    return (
+      <div>
+        <ChatMessage type="agent" message={thoughtContent} actions={actions} />
+        <MicroagentStatusWrapper
+          microagentStatus={microagentStatus}
+          microagentConversationId={microagentConversationId}
+          microagentPRUrl={microagentPRUrl}
+          actions={actions}
+        />
+      </div>
+    );
+  }
+
+  return (
+    <MicroagentStatusWrapper
+      microagentStatus={microagentStatus}
+      microagentConversationId={microagentConversationId}
+      microagentPRUrl={microagentPRUrl}
+      actions={actions}
+    />
+  );
+}
diff --git a/frontend/src/components/v1/chat/event-message-components/user-assistant-event-message.tsx b/frontend/src/components/v1/chat/event-message-components/user-assistant-event-message.tsx
new file mode 100644
index 0000000000..260f9688ef
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-message-components/user-assistant-event-message.tsx
@@ -0,0 +1,65 @@
+import React from "react";
+import { MessageEvent } from "#/types/v1/core";
+import { ChatMessage } from "../../../features/chat/chat-message";
+import { ImageCarousel } from "../../../features/images/image-carousel";
+// TODO: Implement file_urls support for V1 messages
+// import { FileList } from "../../../features/files/file-list";
+import { ConfirmationButtons } from "#/components/shared/buttons/confirmation-buttons";
+import { MicroagentStatusWrapper } from "../../../features/chat/event-message-components/microagent-status-wrapper";
+// TODO: Implement V1 LikertScaleWrapper when API supports V1 event IDs
+// import { LikertScaleWrapper } from "../../../features/chat/event-message-components/likert-scale-wrapper";
+import { parseMessageFromEvent } from "../event-content-helpers/parse-message-from-event";
+import { MicroagentStatus } from "#/types/microagent-status";
+
+interface UserAssistantEventMessageProps {
+  event: MessageEvent;
+  shouldShowConfirmationButtons: boolean;
+  microagentStatus?: MicroagentStatus | null;
+  microagentConversationId?: string;
+  microagentPRUrl?: string;
+  actions?: Array<{
+    icon: React.ReactNode;
+    onClick: () => void;
+    tooltip?: string;
+  }>;
+}
+
+export function UserAssistantEventMessage({
+  event,
+  shouldShowConfirmationButtons,
+  microagentStatus,
+  microagentConversationId,
+  microagentPRUrl,
+  actions,
+}: UserAssistantEventMessageProps) {
+  const message = parseMessageFromEvent(event);
+
+  // Extract image URLs from the message content
+  const imageUrls: string[] = [];
+  if (Array.isArray(event.llm_message.content)) {
+    event.llm_message.content.forEach((content) => {
+      if (content.type === "image") {
+        imageUrls.push(...content.image_urls);
+      }
+    });
+  }
+
+  return (
+    <>
+      <ChatMessage type={event.source} message={message} actions={actions}>
+        {imageUrls.length > 0 && (
+          <ImageCarousel size="small" images={imageUrls} />
+        )}
+        {/* TODO: Handle file_urls if V1 messages support them */}
+        {shouldShowConfirmationButtons && <ConfirmationButtons />}
+      </ChatMessage>
+      <MicroagentStatusWrapper
+        microagentStatus={microagentStatus}
+        microagentConversationId={microagentConversationId}
+        microagentPRUrl={microagentPRUrl}
+        actions={actions}
+      />
+      {/* LikertScaleWrapper expects V0 event types, skip for now */}
+    </>
+  );
+}
diff --git a/frontend/src/components/v1/chat/event-message.tsx b/frontend/src/components/v1/chat/event-message.tsx
new file mode 100644
index 0000000000..9ff9950473
--- /dev/null
+++ b/frontend/src/components/v1/chat/event-message.tsx
@@ -0,0 +1,119 @@
+import React from "react";
+import { OpenHandsEvent, MessageEvent, ActionEvent } from "#/types/v1/core";
+import { FinishAction } from "#/types/v1/core/base/action";
+import {
+  isActionEvent,
+  isObservationEvent,
+  isAgentErrorEvent,
+} from "#/types/v1/type-guards";
+import { MicroagentStatus } from "#/types/microagent-status";
+import { useConfig } from "#/hooks/query/use-config";
+// TODO: Implement V1 feedback functionality when API supports V1 event IDs
+// import { useFeedbackExists } from "#/hooks/query/use-feedback-exists";
+import {
+  ErrorEventMessage,
+  UserAssistantEventMessage,
+  FinishEventMessage,
+  ObservationPairEventMessage,
+  GenericEventMessageWrapper,
+} from "./event-message-components";
+
+interface EventMessageProps {
+  event: OpenHandsEvent;
+  hasObservationPair: boolean;
+  isAwaitingUserConfirmation: boolean;
+  isLastMessage: boolean;
+  microagentStatus?: MicroagentStatus | null;
+  microagentConversationId?: string;
+  microagentPRUrl?: string;
+  actions?: Array<{
+    icon: React.ReactNode;
+    onClick: () => void;
+    tooltip?: string;
+  }>;
+  isInLast10Actions: boolean;
+}
+
+/* eslint-disable react/jsx-props-no-spreading */
+export function EventMessage({
+  event,
+  hasObservationPair,
+  isAwaitingUserConfirmation,
+  isLastMessage,
+  microagentStatus,
+  microagentConversationId,
+  microagentPRUrl,
+  actions,
+  isInLast10Actions,
+}: EventMessageProps) {
+  const shouldShowConfirmationButtons =
+    isLastMessage && event.source === "agent" && isAwaitingUserConfirmation;
+
+  const { data: config } = useConfig();
+
+  // V1 events use string IDs, but useFeedbackExists expects number
+  // For now, we'll skip feedback functionality for V1 events
+  const feedbackData = { exists: false };
+  const isCheckingFeedback = false;
+
+  // Common props for components that need them
+  const commonProps = {
+    microagentStatus,
+    microagentConversationId,
+    microagentPRUrl,
+    actions,
+    isLastMessage,
+    isInLast10Actions,
+    config,
+    isCheckingFeedback,
+    feedbackData,
+  };
+
+  // Agent error events
+  if (isAgentErrorEvent(event)) {
+    return <ErrorEventMessage event={event} {...commonProps} />;
+  }
+
+  // Observation pairs with actions
+  if (hasObservationPair && isActionEvent(event)) {
+    return (
+      <ObservationPairEventMessage
+        event={event}
+        microagentStatus={microagentStatus}
+        microagentConversationId={microagentConversationId}
+        microagentPRUrl={microagentPRUrl}
+        actions={actions}
+      />
+    );
+  }
+
+  // Finish actions
+  if (isActionEvent(event) && event.action.kind === "FinishAction") {
+    return (
+      <FinishEventMessage
+        event={event as ActionEvent<FinishAction>}
+        {...commonProps}
+      />
+    );
+  }
+
+  // Message events (user and assistant messages)
+  if (!isActionEvent(event) && !isObservationEvent(event)) {
+    // This is a MessageEvent
+    return (
+      <UserAssistantEventMessage
+        event={event as MessageEvent}
+        shouldShowConfirmationButtons={shouldShowConfirmationButtons}
+        {...commonProps}
+      />
+    );
+  }
+
+  // Generic fallback for all other events (including observation events)
+  return (
+    <GenericEventMessageWrapper
+      event={event}
+      shouldShowConfirmationButtons={shouldShowConfirmationButtons}
+    />
+  );
+}
diff --git a/frontend/src/components/v1/chat/index.ts b/frontend/src/components/v1/chat/index.ts
new file mode 100644
index 0000000000..bce6a75795
--- /dev/null
+++ b/frontend/src/components/v1/chat/index.ts
@@ -0,0 +1,8 @@
+export { Messages } from "./messages";
+export { EventMessage } from "./event-message";
+export * from "./event-message-components";
+export { getEventContent } from "./event-content-helpers/get-event-content";
+export {
+  shouldRenderEvent,
+  hasUserEvent,
+} from "./event-content-helpers/should-render-event";
diff --git a/frontend/src/components/v1/chat/messages.tsx b/frontend/src/components/v1/chat/messages.tsx
new file mode 100644
index 0000000000..b6b7a1ca1d
--- /dev/null
+++ b/frontend/src/components/v1/chat/messages.tsx
@@ -0,0 +1,73 @@
+import React from "react";
+import { OpenHandsEvent } from "#/types/v1/core";
+import { isActionEvent, isObservationEvent } from "#/types/v1/type-guards";
+import { EventMessage } from "./event-message";
+import { ChatMessage } from "../../features/chat/chat-message";
+import { useOptimisticUserMessageStore } from "#/stores/optimistic-user-message-store";
+// TODO: Implement microagent functionality for V1 when APIs support V1 event IDs
+// import { AgentState } from "#/types/agent-state";
+// import MemoryIcon from "#/icons/memory_icon.svg?react";
+
+interface MessagesProps {
+  messages: OpenHandsEvent[];
+  isAwaitingUserConfirmation: boolean;
+}
+
+export const Messages: React.FC<MessagesProps> = React.memo(
+  ({ messages, isAwaitingUserConfirmation }) => {
+    const { getOptimisticUserMessage } = useOptimisticUserMessageStore();
+
+    const optimisticUserMessage = getOptimisticUserMessage();
+
+    const actionHasObservationPair = React.useCallback(
+      (event: OpenHandsEvent): boolean => {
+        if (isActionEvent(event)) {
+          // Check if there's a corresponding observation event
+          return !!messages.some(
+            (msg) => isObservationEvent(msg) && msg.action_id === event.id,
+          );
+        }
+
+        return false;
+      },
+      [messages],
+    );
+
+    // TODO: Implement microagent functionality for V1 if needed
+    // For now, we'll skip microagent features
+
+    return (
+      <>
+        {messages.map((message, index) => (
+          <EventMessage
+            key={message.id}
+            event={message}
+            hasObservationPair={actionHasObservationPair(message)}
+            isAwaitingUserConfirmation={isAwaitingUserConfirmation}
+            isLastMessage={messages.length - 1 === index}
+            isInLast10Actions={messages.length - 1 - index < 10}
+            // Microagent props - not implemented yet for V1
+            // microagentStatus={undefined}
+            // microagentConversationId={undefined}
+            // microagentPRUrl={undefined}
+            // actions={undefined}
+          />
+        ))}
+
+        {optimisticUserMessage && (
+          <ChatMessage type="user" message={optimisticUserMessage} />
+        )}
+      </>
+    );
+  },
+  (prevProps, nextProps) => {
+    // Prevent re-renders if messages are the same length
+    if (prevProps.messages.length !== nextProps.messages.length) {
+      return false;
+    }
+
+    return true;
+  },
+);
+
+Messages.displayName = "Messages";
diff --git a/frontend/src/components/v1/index.ts b/frontend/src/components/v1/index.ts
new file mode 100644
index 0000000000..d27da0d970
--- /dev/null
+++ b/frontend/src/components/v1/index.ts
@@ -0,0 +1 @@
+export * from "./chat";
diff --git a/frontend/src/context/ws-client-provider.tsx b/frontend/src/context/ws-client-provider.tsx
index 8e0ef3830c..8f0a2829c0 100644
--- a/frontend/src/context/ws-client-provider.tsx
+++ b/frontend/src/context/ws-client-provider.tsx
@@ -28,7 +28,12 @@ import { useErrorMessageStore } from "#/stores/error-message-store";
 import { useOptimisticUserMessageStore } from "#/stores/optimistic-user-message-store";
 import { useEventStore } from "#/stores/use-event-store";
 
-export type WebSocketStatus = "CONNECTING" | "CONNECTED" | "DISCONNECTED";
+/**
+ * @deprecated Use `V1_WebSocketConnectionState` from `conversation-websocket-context.tsx` instead.
+ * This type is for legacy V0 conversations only.
+ */
+// eslint-disable-next-line @typescript-eslint/naming-convention
+export type V0_WebSocketStatus = "CONNECTING" | "CONNECTED" | "DISCONNECTED";
 
 const hasValidMessageProperty = (obj: unknown): obj is { message: string } =>
   typeof obj === "object" &&
@@ -69,7 +74,7 @@ const isMessageAction = (
   isUserMessage(event) || isAssistantMessage(event);
 
 interface UseWsClient {
-  webSocketStatus: WebSocketStatus;
+  webSocketStatus: V0_WebSocketStatus;
   isLoadingMessages: boolean;
   send: (event: Record<string, unknown>) => void;
 }
@@ -132,7 +137,7 @@ export function WsClientProvider({
   const queryClient = useQueryClient();
   const sioRef = React.useRef<Socket | null>(null);
   const [webSocketStatus, setWebSocketStatus] =
-    React.useState<WebSocketStatus>("DISCONNECTED");
+    React.useState<V0_WebSocketStatus>("DISCONNECTED");
   const lastEventRef = React.useRef<Record<string, unknown> | null>(null);
   const { providers } = useUserProviders();
 
diff --git a/frontend/src/contexts/conversation-websocket-context.tsx b/frontend/src/contexts/conversation-websocket-context.tsx
index fc851dd75c..b04f7aba9b 100644
--- a/frontend/src/contexts/conversation-websocket-context.tsx
+++ b/frontend/src/contexts/conversation-websocket-context.tsx
@@ -7,20 +7,37 @@ import React, {
   useMemo,
 } from "react";
 import { useQueryClient } from "@tanstack/react-query";
-import { useWebSocket } from "#/hooks/use-websocket";
+import { useWebSocket, WebSocketHookOptions } from "#/hooks/use-websocket";
 import { useEventStore } from "#/stores/use-event-store";
 import { useErrorMessageStore } from "#/stores/error-message-store";
 import { useOptimisticUserMessageStore } from "#/stores/optimistic-user-message-store";
+import { useV1ConversationStateStore } from "#/stores/v1-conversation-state-store";
+import { useCommandStore } from "#/state/command-store";
 import {
   isV1Event,
   isAgentErrorEvent,
   isUserMessageEvent,
   isActionEvent,
+  isConversationStateUpdateEvent,
+  isFullStateConversationStateUpdateEvent,
+  isAgentStatusConversationStateUpdateEvent,
+  isExecuteBashActionEvent,
+  isExecuteBashObservationEvent,
 } from "#/types/v1/type-guards";
 import { handleActionEventCacheInvalidation } from "#/utils/cache-utils";
+import { buildWebSocketUrl } from "#/utils/websocket-url";
+import type { V1SendMessageRequest } from "#/api/conversation-service/v1-conversation-service.types";
+
+// eslint-disable-next-line @typescript-eslint/naming-convention
+export type V1_WebSocketConnectionState =
+  | "CONNECTING"
+  | "OPEN"
+  | "CLOSED"
+  | "CLOSING";
 
 interface ConversationWebSocketContextType {
-  connectionState: "CONNECTING" | "OPEN" | "CLOSED" | "CLOSING";
+  connectionState: V1_WebSocketConnectionState;
+  sendMessage: (message: V1SendMessageRequest) => Promise<void>;
 }
 
 const ConversationWebSocketContext = createContext<
@@ -30,22 +47,42 @@ const ConversationWebSocketContext = createContext<
 export function ConversationWebSocketProvider({
   children,
   conversationId,
+  conversationUrl,
+  sessionApiKey,
 }: {
   children: React.ReactNode;
   conversationId?: string;
+  conversationUrl?: string | null;
+  sessionApiKey?: string | null;
 }) {
-  const [connectionState, setConnectionState] = useState<
-    "CONNECTING" | "OPEN" | "CLOSED" | "CLOSING"
-  >("CONNECTING");
+  const [connectionState, setConnectionState] =
+    useState<V1_WebSocketConnectionState>("CONNECTING");
+  // Track if we've ever successfully connected
+  // Don't show errors until after first successful connection
+  const hasConnectedRef = React.useRef(false);
   const queryClient = useQueryClient();
   const { addEvent } = useEventStore();
   const { setErrorMessage, removeErrorMessage } = useErrorMessageStore();
   const { removeOptimisticUserMessage } = useOptimisticUserMessageStore();
+  const { setAgentStatus } = useV1ConversationStateStore();
+  const { appendInput, appendOutput } = useCommandStore();
+
+  // Build WebSocket URL from props
+  const wsUrl = useMemo(
+    () => buildWebSocketUrl(conversationId, conversationUrl),
+    [conversationId, conversationUrl],
+  );
+
+  // Reset hasConnected flag when conversation changes
+  useEffect(() => {
+    hasConnectedRef.current = false;
+  }, [conversationId]);
 
   const handleMessage = useCallback(
     (messageEvent: MessageEvent) => {
       try {
         const event = JSON.parse(messageEvent.data);
+
         // Use type guard to validate v1 event structure
         if (isV1Event(event)) {
           addEvent(event);
@@ -70,25 +107,68 @@ export function ConversationWebSocketProvider({
               queryClient,
             );
           }
+
+          // Handle conversation state updates
+          // TODO: Tests
+          if (isConversationStateUpdateEvent(event)) {
+            if (isFullStateConversationStateUpdateEvent(event)) {
+              setAgentStatus(event.value.agent_status);
+            }
+            if (isAgentStatusConversationStateUpdateEvent(event)) {
+              setAgentStatus(event.value);
+            }
+          }
+
+          // Handle ExecuteBashAction events - add command as input to terminal
+          if (isExecuteBashActionEvent(event)) {
+            appendInput(event.action.command);
+          }
+
+          // Handle ExecuteBashObservation events - add output to terminal
+          if (isExecuteBashObservationEvent(event)) {
+            appendOutput(event.observation.output);
+          }
         }
       } catch (error) {
         // eslint-disable-next-line no-console
         console.warn("Failed to parse WebSocket message as JSON:", error);
       }
     },
-    [addEvent, setErrorMessage, removeOptimisticUserMessage, queryClient],
+    [
+      addEvent,
+      setErrorMessage,
+      removeOptimisticUserMessage,
+      queryClient,
+      conversationId,
+      setAgentStatus,
+      appendInput,
+      appendOutput,
+    ],
   );
 
-  const websocketOptions = useMemo(
-    () => ({
+  const websocketOptions: WebSocketHookOptions = useMemo(() => {
+    const queryParams: Record<string, string | boolean> = {
+      resend_all: true,
+    };
+
+    // Add session_api_key if available
+    if (sessionApiKey) {
+      queryParams.session_api_key = sessionApiKey;
+    }
+
+    return {
+      queryParams,
+      reconnect: { enabled: true },
       onOpen: () => {
         setConnectionState("OPEN");
+        hasConnectedRef.current = true; // Mark that we've successfully connected
         removeErrorMessage(); // Clear any previous error messages on successful connection
       },
       onClose: (event: CloseEvent) => {
         setConnectionState("CLOSED");
-        // Set error message for unexpected disconnects (not normal closure)
-        if (event.code !== 1000) {
+        // Only show error message if we've previously connected successfully
+        // This prevents showing errors during initial connection attempts (e.g., when auto-starting a conversation)
+        if (event.code !== 1000 && hasConnectedRef.current) {
           setErrorMessage(
             `Connection lost: ${event.reason || "Unexpected disconnect"}`,
           );
@@ -96,20 +176,44 @@ export function ConversationWebSocketProvider({
       },
       onError: () => {
         setConnectionState("CLOSED");
-        setErrorMessage("Failed to connect to server");
+        // Only show error message if we've previously connected successfully
+        if (hasConnectedRef.current) {
+          setErrorMessage("Failed to connect to server");
+        }
       },
       onMessage: handleMessage,
-    }),
-    [handleMessage, setErrorMessage, removeErrorMessage],
-  );
+    };
+  }, [handleMessage, setErrorMessage, removeErrorMessage, sessionApiKey]);
 
-  const { socket } = useWebSocket(
-    "ws://localhost/events/socket",
-    websocketOptions,
+  // Build a fallback URL to prevent hook from connecting if conversation data isn't ready
+  const websocketUrl = wsUrl || "ws://localhost/placeholder";
+  const { socket } = useWebSocket(websocketUrl, websocketOptions);
+
+  // V1 send message function via WebSocket
+  const sendMessage = useCallback(
+    async (message: V1SendMessageRequest) => {
+      if (!socket || socket.readyState !== WebSocket.OPEN) {
+        const error = "WebSocket is not connected";
+        setErrorMessage(error);
+        throw new Error(error);
+      }
+
+      try {
+        // Send message through WebSocket as JSON
+        socket.send(JSON.stringify(message));
+      } catch (error) {
+        const errorMessage =
+          error instanceof Error ? error.message : "Failed to send message";
+        setErrorMessage(errorMessage);
+        throw error;
+      }
+    },
+    [socket, setErrorMessage],
   );
 
   useEffect(() => {
-    if (socket) {
+    // Only process socket updates if we have a valid URL
+    if (socket && wsUrl) {
       // Update state based on socket readyState
       const updateState = () => {
         switch (socket.readyState) {
@@ -133,9 +237,12 @@ export function ConversationWebSocketProvider({
 
       updateState();
     }
-  }, [socket]);
+  }, [socket, wsUrl]);
 
-  const contextValue = useMemo(() => ({ connectionState }), [connectionState]);
+  const contextValue = useMemo(
+    () => ({ connectionState, sendMessage }),
+    [connectionState, sendMessage],
+  );
 
   return (
     <ConversationWebSocketContext.Provider value={contextValue}>
@@ -145,12 +252,9 @@ export function ConversationWebSocketProvider({
 }
 
 export const useConversationWebSocket =
-  (): ConversationWebSocketContextType => {
+  (): ConversationWebSocketContextType | null => {
     const context = useContext(ConversationWebSocketContext);
-    if (context === undefined) {
-      throw new Error(
-        "useConversationWebSocket must be used within a ConversationWebSocketProvider",
-      );
-    }
-    return context;
+    // Return null instead of throwing when not in provider
+    // This allows the hook to be called conditionally based on conversation version
+    return context || null;
   };
diff --git a/frontend/src/contexts/websocket-provider-wrapper.tsx b/frontend/src/contexts/websocket-provider-wrapper.tsx
index 59c3b925f3..bf2a28d6b0 100644
--- a/frontend/src/contexts/websocket-provider-wrapper.tsx
+++ b/frontend/src/contexts/websocket-provider-wrapper.tsx
@@ -1,6 +1,7 @@
 import React from "react";
 import { WsClientProvider } from "#/context/ws-client-provider";
 import { ConversationWebSocketProvider } from "#/contexts/conversation-websocket-context";
+import { useActiveConversation } from "#/hooks/query/use-active-conversation";
 
 interface WebSocketProviderWrapperProps {
   children: React.ReactNode;
@@ -33,6 +34,9 @@ export function WebSocketProviderWrapper({
   conversationId,
   version,
 }: WebSocketProviderWrapperProps) {
+  // Get conversation data for V1 provider
+  const { data: conversation } = useActiveConversation();
+
   if (version === 0) {
     return (
       <WsClientProvider conversationId={conversationId}>
@@ -43,7 +47,11 @@ export function WebSocketProviderWrapper({
 
   if (version === 1) {
     return (
-      <ConversationWebSocketProvider conversationId={conversationId}>
+      <ConversationWebSocketProvider
+        conversationId={conversationId}
+        conversationUrl={conversation?.url}
+        sessionApiKey={conversation?.session_api_key}
+      >
         {children}
       </ConversationWebSocketProvider>
     );
diff --git a/frontend/src/hooks/mutation/conversation-mutation-utils.ts b/frontend/src/hooks/mutation/conversation-mutation-utils.ts
new file mode 100644
index 0000000000..0414f19fa6
--- /dev/null
+++ b/frontend/src/hooks/mutation/conversation-mutation-utils.ts
@@ -0,0 +1,122 @@
+import { QueryClient } from "@tanstack/react-query";
+import { Provider } from "#/types/settings";
+import ConversationService from "#/api/conversation-service/conversation-service.api";
+import V1ConversationService from "#/api/conversation-service/v1-conversation-service.api";
+
+/**
+ * Gets the conversation version from the cache
+ */
+export const getConversationVersionFromQueryCache = (
+  queryClient: QueryClient,
+  conversationId: string,
+): "V0" | "V1" => {
+  const conversation = queryClient.getQueryData<{
+    conversation_version?: string;
+  }>(["user", "conversation", conversationId]);
+
+  return conversation?.conversation_version === "V1" ? "V1" : "V0";
+};
+
+/**
+ * Fetches a V1 conversation's sandbox_id
+ */
+const fetchV1ConversationSandboxId = async (
+  conversationId: string,
+): Promise<string> => {
+  const conversations = await V1ConversationService.batchGetAppConversations([
+    conversationId,
+  ]);
+
+  const appConversation = conversations[0];
+  if (!appConversation) {
+    throw new Error(`V1 conversation not found: ${conversationId}`);
+  }
+
+  return appConversation.sandbox_id;
+};
+
+/**
+ * Pause a V1 conversation sandbox by fetching the sandbox_id and pausing it
+ */
+export const pauseV1ConversationSandbox = async (conversationId: string) => {
+  const sandboxId = await fetchV1ConversationSandboxId(conversationId);
+  return V1ConversationService.pauseSandbox(sandboxId);
+};
+
+/**
+ * Stops a V0 conversation using the legacy API
+ */
+export const stopV0Conversation = async (conversationId: string) =>
+  ConversationService.stopConversation(conversationId);
+
+/**
+ * Resumes a V1 conversation sandbox by fetching the sandbox_id and resuming it
+ */
+export const resumeV1ConversationSandbox = async (conversationId: string) => {
+  const sandboxId = await fetchV1ConversationSandboxId(conversationId);
+  return V1ConversationService.resumeSandbox(sandboxId);
+};
+
+/**
+ * Starts a V0 conversation using the legacy API
+ */
+export const startV0Conversation = async (
+  conversationId: string,
+  providers?: Provider[],
+) => ConversationService.startConversation(conversationId, providers);
+
+/**
+ * Optimistically updates the conversation status in the cache
+ */
+export const updateConversationStatusInCache = (
+  queryClient: QueryClient,
+  conversationId: string,
+  status: string,
+): void => {
+  // Update the individual conversation cache
+  queryClient.setQueryData<{ status: string }>(
+    ["user", "conversation", conversationId],
+    (oldData) => {
+      if (!oldData) return oldData;
+      return { ...oldData, status };
+    },
+  );
+
+  // Update the conversations list cache
+  queryClient.setQueriesData<{
+    pages: Array<{
+      results: Array<{ conversation_id: string; status: string }>;
+    }>;
+  }>({ queryKey: ["user", "conversations"] }, (oldData) => {
+    if (!oldData) return oldData;
+
+    return {
+      ...oldData,
+      pages: oldData.pages.map((page) => ({
+        ...page,
+        results: page.results.map((conv) =>
+          conv.conversation_id === conversationId ? { ...conv, status } : conv,
+        ),
+      })),
+    };
+  });
+};
+
+/**
+ * Invalidates all queries related to conversation mutations (start/stop)
+ */
+export const invalidateConversationQueries = (
+  queryClient: QueryClient,
+  conversationId: string,
+): void => {
+  // Invalidate the specific conversation query to trigger automatic refetch
+  queryClient.invalidateQueries({
+    queryKey: ["user", "conversation", conversationId],
+  });
+  // Also invalidate the conversations list for consistency
+  queryClient.invalidateQueries({ queryKey: ["user", "conversations"] });
+  // Invalidate V1 batch get queries
+  queryClient.invalidateQueries({
+    queryKey: ["v1-batch-get-app-conversations"],
+  });
+};
diff --git a/frontend/src/hooks/mutation/use-create-conversation.ts b/frontend/src/hooks/mutation/use-create-conversation.ts
index 6c97d8fba0..1d7336537a 100644
--- a/frontend/src/hooks/mutation/use-create-conversation.ts
+++ b/frontend/src/hooks/mutation/use-create-conversation.ts
@@ -1,9 +1,11 @@
 import { useMutation, useQueryClient } from "@tanstack/react-query";
 import posthog from "posthog-js";
 import ConversationService from "#/api/conversation-service/conversation-service.api";
+import V1ConversationService from "#/api/conversation-service/v1-conversation-service.api";
 import { SuggestedTask } from "#/utils/types";
 import { Provider } from "#/types/settings";
-import { CreateMicroagent } from "#/api/open-hands.types";
+import { CreateMicroagent, Conversation } from "#/api/open-hands.types";
+import { USE_V1_CONVERSATION_API } from "#/utils/feature-flags";
 
 interface CreateConversationVariables {
   query?: string;
@@ -17,12 +19,24 @@ interface CreateConversationVariables {
   createMicroagent?: CreateMicroagent;
 }
 
+// Response type that combines both V1 and legacy responses
+interface CreateConversationResponse extends Partial<Conversation> {
+  conversation_id: string;
+  session_api_key: string | null;
+  url: string | null;
+  // V1 specific fields
+  v1_task_id?: string;
+  is_v1?: boolean;
+}
+
 export const useCreateConversation = () => {
   const queryClient = useQueryClient();
 
   return useMutation({
     mutationKey: ["create-conversation"],
-    mutationFn: async (variables: CreateConversationVariables) => {
+    mutationFn: async (
+      variables: CreateConversationVariables,
+    ): Promise<CreateConversationResponse> => {
       const {
         query,
         repository,
@@ -31,7 +45,33 @@ export const useCreateConversation = () => {
         createMicroagent,
       } = variables;
 
-      return ConversationService.createConversation(
+      const useV1 = USE_V1_CONVERSATION_API();
+
+      if (useV1) {
+        // Use V1 API - creates a conversation start task
+        const startTask = await V1ConversationService.createConversation(
+          repository?.name,
+          repository?.gitProvider,
+          query,
+          repository?.branch,
+          conversationInstructions,
+          undefined, // trigger - will be set by backend
+        );
+
+        // Return a special task ID that the frontend will recognize
+        // Format: "task-{uuid}" so the conversation screen can poll the task
+        // Once the task is ready, it will navigate to the actual conversation ID
+        return {
+          conversation_id: `task-${startTask.id}`,
+          session_api_key: null,
+          url: startTask.agent_server_url,
+          v1_task_id: startTask.id,
+          is_v1: true,
+        };
+      }
+
+      // Use legacy API
+      const conversation = await ConversationService.createConversation(
         repository?.name,
         repository?.gitProvider,
         query,
@@ -40,6 +80,11 @@ export const useCreateConversation = () => {
         conversationInstructions,
         createMicroagent,
       );
+
+      return {
+        ...conversation,
+        is_v1: false,
+      };
     },
     onSuccess: async (_, { query, repository }) => {
       posthog.capture("initial_query_submitted", {
diff --git a/frontend/src/hooks/mutation/use-unified-start-conversation.ts b/frontend/src/hooks/mutation/use-unified-start-conversation.ts
new file mode 100644
index 0000000000..6a65a7c305
--- /dev/null
+++ b/frontend/src/hooks/mutation/use-unified-start-conversation.ts
@@ -0,0 +1,94 @@
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import toast from "react-hot-toast";
+import { useTranslation } from "react-i18next";
+import { Provider } from "#/types/settings";
+import { useErrorMessageStore } from "#/stores/error-message-store";
+import { TOAST_OPTIONS } from "#/utils/custom-toast-handlers";
+import { I18nKey } from "#/i18n/declaration";
+import {
+  getConversationVersionFromQueryCache,
+  resumeV1ConversationSandbox,
+  startV0Conversation,
+  updateConversationStatusInCache,
+  invalidateConversationQueries,
+} from "./conversation-mutation-utils";
+
+/**
+ * Unified hook that automatically routes to the correct resume conversation sandbox implementation
+ * based on the conversation version (V0 or V1).
+ *
+ * This hook checks the cached conversation data to determine the version, then calls
+ * the appropriate API directly. Returns a single useMutation instance that all components share.
+ *
+ * Usage is the same as useStartConversation:
+ * const { mutate: startConversation } = useUnifiedResumeConversationSandbox();
+ * startConversation({ conversationId: "some-id", providers: [...] });
+ */
+export const useUnifiedResumeConversationSandbox = () => {
+  const { t } = useTranslation();
+  const queryClient = useQueryClient();
+  const removeErrorMessage = useErrorMessageStore(
+    (state) => state.removeErrorMessage,
+  );
+
+  return useMutation({
+    mutationKey: ["start-conversation"],
+    mutationFn: async (variables: {
+      conversationId: string;
+      providers?: Provider[];
+      version?: "V0" | "V1";
+    }) => {
+      // Use provided version or fallback to cache lookup
+      const version =
+        variables.version ||
+        getConversationVersionFromQueryCache(
+          queryClient,
+          variables.conversationId,
+        );
+
+      if (version === "V1") {
+        return resumeV1ConversationSandbox(variables.conversationId);
+      }
+
+      return startV0Conversation(variables.conversationId, variables.providers);
+    },
+    onMutate: async () => {
+      toast.loading(t(I18nKey.TOAST$STARTING_CONVERSATION), TOAST_OPTIONS);
+
+      await queryClient.cancelQueries({ queryKey: ["user", "conversations"] });
+      const previousConversations = queryClient.getQueryData([
+        "user",
+        "conversations",
+      ]);
+
+      return { previousConversations };
+    },
+    onError: (_, __, context) => {
+      toast.dismiss();
+      toast.error(t(I18nKey.TOAST$FAILED_TO_START_CONVERSATION), TOAST_OPTIONS);
+
+      if (context?.previousConversations) {
+        queryClient.setQueryData(
+          ["user", "conversations"],
+          context.previousConversations,
+        );
+      }
+    },
+    onSettled: (_, __, variables) => {
+      invalidateConversationQueries(queryClient, variables.conversationId);
+    },
+    onSuccess: (_, variables) => {
+      toast.dismiss();
+      toast.success(t(I18nKey.TOAST$CONVERSATION_STARTED), TOAST_OPTIONS);
+
+      // Clear error messages when starting/resuming conversation
+      removeErrorMessage();
+
+      updateConversationStatusInCache(
+        queryClient,
+        variables.conversationId,
+        "RUNNING",
+      );
+    },
+  });
+};
diff --git a/frontend/src/hooks/mutation/use-unified-stop-conversation.ts b/frontend/src/hooks/mutation/use-unified-stop-conversation.ts
new file mode 100644
index 0000000000..bb638c1522
--- /dev/null
+++ b/frontend/src/hooks/mutation/use-unified-stop-conversation.ts
@@ -0,0 +1,93 @@
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { useNavigate, useParams } from "react-router";
+import toast from "react-hot-toast";
+import { useTranslation } from "react-i18next";
+import { TOAST_OPTIONS } from "#/utils/custom-toast-handlers";
+import { I18nKey } from "#/i18n/declaration";
+import {
+  getConversationVersionFromQueryCache,
+  pauseV1ConversationSandbox,
+  stopV0Conversation,
+  updateConversationStatusInCache,
+  invalidateConversationQueries,
+} from "./conversation-mutation-utils";
+
+/**
+ * Unified hook that automatically routes to the correct pause conversation sandbox
+ * implementation based on the conversation version (V0 or V1).
+ *
+ * This hook checks the cached conversation data to determine the version, then calls
+ * the appropriate API directly. Returns a single useMutation instance that all components share.
+ *
+ * Usage is the same as useStopConversation:
+ * const { mutate: stopConversation } = useUnifiedPauseConversationSandbox();
+ * stopConversation({ conversationId: "some-id" });
+ */
+export const useUnifiedPauseConversationSandbox = () => {
+  const { t } = useTranslation();
+  const queryClient = useQueryClient();
+  const navigate = useNavigate();
+  const params = useParams<{ conversationId: string }>();
+
+  return useMutation({
+    mutationKey: ["stop-conversation"],
+    mutationFn: async (variables: {
+      conversationId: string;
+      version?: "V0" | "V1";
+    }) => {
+      // Use provided version or fallback to cache lookup
+      const version =
+        variables.version ||
+        getConversationVersionFromQueryCache(
+          queryClient,
+          variables.conversationId,
+        );
+
+      if (version === "V1") {
+        return pauseV1ConversationSandbox(variables.conversationId);
+      }
+
+      return stopV0Conversation(variables.conversationId);
+    },
+    onMutate: async () => {
+      toast.loading(t(I18nKey.TOAST$STOPPING_CONVERSATION), TOAST_OPTIONS);
+
+      await queryClient.cancelQueries({ queryKey: ["user", "conversations"] });
+      const previousConversations = queryClient.getQueryData([
+        "user",
+        "conversations",
+      ]);
+
+      return { previousConversations };
+    },
+    onError: (_, __, context) => {
+      toast.dismiss();
+      toast.error(t(I18nKey.TOAST$FAILED_TO_STOP_CONVERSATION), TOAST_OPTIONS);
+
+      if (context?.previousConversations) {
+        queryClient.setQueryData(
+          ["user", "conversations"],
+          context.previousConversations,
+        );
+      }
+    },
+    onSettled: (_, __, variables) => {
+      invalidateConversationQueries(queryClient, variables.conversationId);
+    },
+    onSuccess: (_, variables) => {
+      toast.dismiss();
+      toast.success(t(I18nKey.TOAST$CONVERSATION_STOPPED), TOAST_OPTIONS);
+
+      updateConversationStatusInCache(
+        queryClient,
+        variables.conversationId,
+        "STOPPED",
+      );
+
+      // Only redirect if we're stopping the conversation we're currently viewing
+      if (params.conversationId === variables.conversationId) {
+        navigate("/");
+      }
+    },
+  });
+};
diff --git a/frontend/src/hooks/query/use-active-conversation.ts b/frontend/src/hooks/query/use-active-conversation.ts
index 452dba9261..dec6a38f3e 100644
--- a/frontend/src/hooks/query/use-active-conversation.ts
+++ b/frontend/src/hooks/query/use-active-conversation.ts
@@ -5,14 +5,23 @@ import ConversationService from "#/api/conversation-service/conversation-service
 
 export const useActiveConversation = () => {
   const { conversationId } = useConversationId();
-  const userConversation = useUserConversation(conversationId, (query) => {
-    if (query.state.data?.status === "STARTING") {
-      return 3000; // 3 seconds
-    }
-    // TODO: Return conversation title as a WS event to avoid polling
-    // This was changed from 5 minutes to 30 seconds to poll for updated conversation title after an auto update
-    return 30000; // 30 seconds
-  });
+
+  // Don't poll if this is a task ID (format: "task-{uuid}")
+  // Task polling is handled by useTaskPolling hook
+  const isTaskId = conversationId.startsWith("task-");
+  const actualConversationId = isTaskId ? null : conversationId;
+
+  const userConversation = useUserConversation(
+    actualConversationId,
+    (query) => {
+      if (query.state.data?.status === "STARTING") {
+        return 3000; // 3 seconds
+      }
+      // TODO: Return conversation title as a WS event to avoid polling
+      // This was changed from 5 minutes to 30 seconds to poll for updated conversation title after an auto update
+      return 30000; // 30 seconds
+    },
+  );
 
   useEffect(() => {
     const conversation = userConversation.data;
diff --git a/frontend/src/hooks/query/use-conversation-microagents.ts b/frontend/src/hooks/query/use-conversation-microagents.ts
index 1778a7484e..d51b2b311d 100644
--- a/frontend/src/hooks/query/use-conversation-microagents.ts
+++ b/frontend/src/hooks/query/use-conversation-microagents.ts
@@ -2,11 +2,11 @@ import { useQuery } from "@tanstack/react-query";
 import ConversationService from "#/api/conversation-service/conversation-service.api";
 import { useConversationId } from "../use-conversation-id";
 import { AgentState } from "#/types/agent-state";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 
 export const useConversationMicroagents = () => {
   const { conversationId } = useConversationId();
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
 
   return useQuery({
     queryKey: ["conversation", conversationId, "microagents"],
diff --git a/frontend/src/hooks/query/use-start-tasks.ts b/frontend/src/hooks/query/use-start-tasks.ts
new file mode 100644
index 0000000000..da7baa8341
--- /dev/null
+++ b/frontend/src/hooks/query/use-start-tasks.ts
@@ -0,0 +1,25 @@
+import { useQuery } from "@tanstack/react-query";
+import V1ConversationService from "#/api/conversation-service/v1-conversation-service.api";
+
+/**
+ * Hook to fetch in-progress V1 conversation start tasks
+ *
+ * Use case: Show tasks that are provisioning sandboxes, cloning repos, etc.
+ * These are conversations that started but haven't reached READY or ERROR status yet.
+ *
+ * Note: Filters out READY and ERROR status tasks client-side since backend doesn't support status filtering.
+ *
+ * @param limit Maximum number of tasks to return (max 100)
+ * @returns Query result with array of in-progress start tasks
+ */
+export const useStartTasks = (limit = 10) =>
+  useQuery({
+    queryKey: ["start-tasks", "search", limit],
+    queryFn: () => V1ConversationService.searchStartTasks(limit),
+    select: (tasks) =>
+      tasks.filter(
+        (task) => task.status !== "READY" && task.status !== "ERROR",
+      ),
+    staleTime: 1000 * 60 * 1, // 1 minute (short since these are in-progress)
+    gcTime: 1000 * 60 * 5, // 5 minutes
+  });
diff --git a/frontend/src/hooks/query/use-task-polling.ts b/frontend/src/hooks/query/use-task-polling.ts
new file mode 100644
index 0000000000..81dc3e7aa4
--- /dev/null
+++ b/frontend/src/hooks/query/use-task-polling.ts
@@ -0,0 +1,72 @@
+import { useEffect } from "react";
+import { useNavigate } from "react-router";
+import { useQuery } from "@tanstack/react-query";
+import V1ConversationService from "#/api/conversation-service/v1-conversation-service.api";
+import { useConversationId } from "#/hooks/use-conversation-id";
+
+/**
+ * Hook that polls V1 conversation start tasks and navigates when ready.
+ *
+ * This hook:
+ * - Detects if the conversationId URL param is a task ID (format: "task-{uuid}")
+ * - Polls the V1 start task API every 3 seconds until status is READY or ERROR
+ * - Automatically navigates to the conversation URL when the task becomes READY
+ * - Exposes task status and details for UI components to show loading states and errors
+ *
+ * URL patterns:
+ * - /conversations/task-{uuid} → Polls start task, then navigates to /conversations/{conversation-id}
+ * - /conversations/{uuid or hex} → No polling (handled by useActiveConversation)
+ *
+ * Note: This hook does NOT fetch conversation data. It only handles task polling and navigation.
+ */
+export const useTaskPolling = () => {
+  const { conversationId } = useConversationId();
+  const navigate = useNavigate();
+
+  // Check if this is a task ID (format: "task-{uuid}")
+  const isTask = conversationId.startsWith("task-");
+  const taskId = isTask ? conversationId.replace("task-", "") : null;
+
+  // Poll the task if this is a task ID
+  const taskQuery = useQuery({
+    queryKey: ["start-task", taskId],
+    queryFn: async () => {
+      if (!taskId) return null;
+      return V1ConversationService.getStartTask(taskId);
+    },
+    enabled: !!taskId,
+    refetchInterval: (query) => {
+      const task = query.state.data;
+      if (!task) return false;
+
+      // Stop polling if ready or error
+      if (task.status === "READY" || task.status === "ERROR") {
+        return false;
+      }
+
+      // Poll every 3 seconds while task is in progress
+      return 3000;
+    },
+    retry: false,
+  });
+
+  // Navigate to conversation ID when task is ready
+  useEffect(() => {
+    const task = taskQuery.data;
+    if (task?.status === "READY" && task.app_conversation_id) {
+      // Replace the URL with the actual conversation ID
+      navigate(`/conversations/${task.app_conversation_id}`, { replace: true });
+    }
+  }, [taskQuery.data, navigate]);
+
+  return {
+    isTask,
+    taskId,
+    conversationId: isTask ? null : conversationId,
+    task: taskQuery.data,
+    taskStatus: taskQuery.data?.status,
+    taskDetail: taskQuery.data?.detail,
+    taskError: taskQuery.error,
+    isLoadingTask: taskQuery.isLoading,
+  };
+};
diff --git a/frontend/src/hooks/query/use-user-conversation.ts b/frontend/src/hooks/query/use-user-conversation.ts
index fbae346356..401087d8c0 100644
--- a/frontend/src/hooks/query/use-user-conversation.ts
+++ b/frontend/src/hooks/query/use-user-conversation.ts
@@ -6,6 +6,7 @@ import { Conversation } from "#/api/open-hands.types";
 
 const FIVE_MINUTES = 1000 * 60 * 5;
 const FIFTEEN_MINUTES = 1000 * 60 * 15;
+
 type RefetchInterval = (
   query: Query<
     Conversation | null,
@@ -22,7 +23,11 @@ export const useUserConversation = (
   useQuery({
     queryKey: ["user", "conversation", cid],
     queryFn: async () => {
-      const conversation = await ConversationService.getConversation(cid!);
+      if (!cid) return null;
+
+      // Use the legacy GET endpoint - it handles both V0 and V1 conversations
+      // V1 conversations are automatically detected by UUID format and converted
+      const conversation = await ConversationService.getConversation(cid);
       return conversation;
     },
     enabled: !!cid,
diff --git a/frontend/src/hooks/query/use-vscode-url.ts b/frontend/src/hooks/query/use-vscode-url.ts
index 8b0e74df27..ac3e19e553 100644
--- a/frontend/src/hooks/query/use-vscode-url.ts
+++ b/frontend/src/hooks/query/use-vscode-url.ts
@@ -1,7 +1,9 @@
 import { useQuery } from "@tanstack/react-query";
 import { useTranslation } from "react-i18next";
 import ConversationService from "#/api/conversation-service/conversation-service.api";
+import V1ConversationService from "#/api/conversation-service/v1-conversation-service.api";
 import { useConversationId } from "#/hooks/use-conversation-id";
+import { useActiveConversation } from "#/hooks/query/use-active-conversation";
 import { I18nKey } from "#/i18n/declaration";
 import { transformVSCodeUrl } from "#/utils/vscode-url-helper";
 import { useRuntimeIsReady } from "#/hooks/use-runtime-is-ready";
@@ -15,13 +17,31 @@ interface VSCodeUrlResult {
 export const useVSCodeUrl = () => {
   const { t } = useTranslation();
   const { conversationId } = useConversationId();
+  const { data: conversation } = useActiveConversation();
   const runtimeIsReady = useRuntimeIsReady();
 
+  const isV1Conversation = conversation?.conversation_version === "V1";
+
   return useQuery<VSCodeUrlResult>({
-    queryKey: ["vscode_url", conversationId],
+    queryKey: [
+      "vscode_url",
+      conversationId,
+      isV1Conversation,
+      conversation?.url,
+      conversation?.session_api_key,
+    ],
     queryFn: async () => {
       if (!conversationId) throw new Error("No conversation ID");
-      const data = await ConversationService.getVSCodeUrl(conversationId);
+
+      // Use appropriate API based on conversation version
+      const data = isV1Conversation
+        ? await V1ConversationService.getVSCodeUrl(
+            conversationId,
+            conversation?.url,
+            conversation?.session_api_key,
+          )
+        : await ConversationService.getVSCodeUrl(conversationId);
+
       if (data.vscode_url) {
         return {
           url: transformVSCodeUrl(data.vscode_url),
diff --git a/frontend/src/hooks/use-agent-state.ts b/frontend/src/hooks/use-agent-state.ts
new file mode 100644
index 0000000000..e36c93153f
--- /dev/null
+++ b/frontend/src/hooks/use-agent-state.ts
@@ -0,0 +1,56 @@
+import { useMemo } from "react";
+import { useAgentStore } from "#/stores/agent-store";
+import { useV1ConversationStateStore } from "#/stores/v1-conversation-state-store";
+import { useActiveConversation } from "#/hooks/query/use-active-conversation";
+import { AgentState } from "#/types/agent-state";
+import { V1AgentStatus } from "#/types/v1/core/base/common";
+
+/**
+ * Maps V1 agent status to V0 AgentState
+ */
+function mapV1StatusToV0State(status: V1AgentStatus | null): AgentState {
+  if (!status) {
+    return AgentState.LOADING;
+  }
+
+  switch (status) {
+    case V1AgentStatus.IDLE:
+      return AgentState.AWAITING_USER_INPUT;
+    case V1AgentStatus.RUNNING:
+      return AgentState.RUNNING;
+    case V1AgentStatus.PAUSED:
+      return AgentState.PAUSED;
+    case V1AgentStatus.WAITING_FOR_CONFIRMATION:
+      return AgentState.AWAITING_USER_CONFIRMATION;
+    case V1AgentStatus.FINISHED:
+      return AgentState.FINISHED;
+    case V1AgentStatus.ERROR:
+      return AgentState.ERROR;
+    case V1AgentStatus.STUCK:
+      return AgentState.ERROR; // Map STUCK to ERROR for now
+    default:
+      return AgentState.LOADING;
+  }
+}
+
+/**
+ * Unified hook that returns the current agent state
+ * - For V0 conversations: Returns state from useAgentStore
+ * - For V1 conversations: Returns mapped state from useV1ConversationStateStore
+ */
+export function useAgentState() {
+  const { data: conversation } = useActiveConversation();
+  const v0State = useAgentStore((state) => state.curAgentState);
+  const v1Status = useV1ConversationStateStore((state) => state.agent_status);
+
+  const isV1Conversation = conversation?.conversation_version === "V1";
+
+  const curAgentState = useMemo(() => {
+    if (isV1Conversation) {
+      return mapV1StatusToV0State(v1Status);
+    }
+    return v0State;
+  }, [isV1Conversation, v1Status, v0State]);
+
+  return { curAgentState };
+}
diff --git a/frontend/src/hooks/use-conversation-name-context-menu.ts b/frontend/src/hooks/use-conversation-name-context-menu.ts
index d286410d28..017a01f478 100644
--- a/frontend/src/hooks/use-conversation-name-context-menu.ts
+++ b/frontend/src/hooks/use-conversation-name-context-menu.ts
@@ -8,7 +8,7 @@ import { isSystemMessage, isActionOrObservation } from "#/types/core/guards";
 import { ConversationStatus } from "#/types/conversation-status";
 import ConversationService from "#/api/conversation-service/conversation-service.api";
 import { useDeleteConversation } from "./mutation/use-delete-conversation";
-import { useStopConversation } from "./mutation/use-stop-conversation";
+import { useUnifiedPauseConversationSandbox } from "./mutation/use-unified-stop-conversation";
 import { useGetTrajectory } from "./mutation/use-get-trajectory";
 import { downloadTrajectory } from "#/utils/download-trajectory";
 import { displayErrorToast } from "#/utils/custom-toast-handlers";
@@ -34,7 +34,7 @@ export function useConversationNameContextMenu({
   const navigate = useNavigate();
   const events = useEventStore((state) => state.events);
   const { mutate: deleteConversation } = useDeleteConversation();
-  const { mutate: stopConversation } = useStopConversation();
+  const { mutate: stopConversation } = useUnifiedPauseConversationSandbox();
   const { mutate: getTrajectory } = useGetTrajectory();
   const metrics = useMetricsStore();
 
diff --git a/frontend/src/hooks/use-effect-once.ts b/frontend/src/hooks/use-effect-once.ts
deleted file mode 100644
index 57b18a9237..0000000000
--- a/frontend/src/hooks/use-effect-once.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import React from "react";
-
-// Introduce this custom React hook to run any given effect
-// ONCE. In Strict mode, React will run all useEffect's twice,
-// which will trigger a WebSocket connection and then immediately
-// close it, causing the "closed before could connect" error.
-export const useEffectOnce = (callback: () => void) => {
-  const isUsedRef = React.useRef(false);
-
-  React.useEffect(() => {
-    if (isUsedRef.current) {
-      return;
-    }
-
-    isUsedRef.current = true;
-    callback();
-  }, [isUsedRef.current]);
-};
diff --git a/frontend/src/hooks/use-handle-runtime-active.ts b/frontend/src/hooks/use-handle-runtime-active.ts
index 52dad8be94..dcddac3d51 100644
--- a/frontend/src/hooks/use-handle-runtime-active.ts
+++ b/frontend/src/hooks/use-handle-runtime-active.ts
@@ -1,8 +1,8 @@
 import { RUNTIME_INACTIVE_STATES } from "#/types/agent-state";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 
 export const useHandleRuntimeActive = () => {
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
 
   const runtimeActive = !RUNTIME_INACTIVE_STATES.includes(curAgentState);
 
diff --git a/frontend/src/hooks/use-handle-ws-events.ts b/frontend/src/hooks/use-handle-ws-events.ts
index 3b4b7b0bd1..2e87dc4c50 100644
--- a/frontend/src/hooks/use-handle-ws-events.ts
+++ b/frontend/src/hooks/use-handle-ws-events.ts
@@ -1,9 +1,9 @@
 import React from "react";
-import { useWsClient } from "#/context/ws-client-provider";
 import { generateAgentStateChangeEvent } from "#/services/agent-state-service";
 import { AgentState } from "#/types/agent-state";
 import { displayErrorToast } from "#/utils/custom-toast-handlers";
 import { useEventStore } from "#/stores/use-event-store";
+import { useSendMessage } from "#/hooks/use-send-message";
 
 interface ServerError {
   error: boolean | string;
@@ -14,7 +14,7 @@ interface ServerError {
 const isServerError = (data: object): data is ServerError => "error" in data;
 
 export const useHandleWSEvents = () => {
-  const { send } = useWsClient();
+  const { send } = useSendMessage();
   const events = useEventStore((state) => state.events);
 
   React.useEffect(() => {
diff --git a/frontend/src/hooks/use-runtime-is-ready.ts b/frontend/src/hooks/use-runtime-is-ready.ts
index 0cd61ac918..914b3624c4 100644
--- a/frontend/src/hooks/use-runtime-is-ready.ts
+++ b/frontend/src/hooks/use-runtime-is-ready.ts
@@ -1,6 +1,6 @@
 import { RUNTIME_INACTIVE_STATES } from "#/types/agent-state";
 import { useActiveConversation } from "./query/use-active-conversation";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 
 /**
  * Hook to determine if the runtime is ready for operations
@@ -9,7 +9,7 @@ import { useAgentStore } from "#/stores/agent-store";
  */
 export const useRuntimeIsReady = (): boolean => {
   const { data: conversation } = useActiveConversation();
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
 
   return (
     conversation?.status === "RUNNING" &&
diff --git a/frontend/src/hooks/use-send-message.ts b/frontend/src/hooks/use-send-message.ts
new file mode 100644
index 0000000000..1e1d627181
--- /dev/null
+++ b/frontend/src/hooks/use-send-message.ts
@@ -0,0 +1,73 @@
+import { useCallback } from "react";
+import { useWsClient } from "#/context/ws-client-provider";
+import { useActiveConversation } from "#/hooks/query/use-active-conversation";
+import { useConversationWebSocket } from "#/contexts/conversation-websocket-context";
+import { V1MessageContent } from "#/api/conversation-service/v1-conversation-service.types";
+
+/**
+ * Unified hook for sending messages that works with both V0 and V1 conversations
+ * - For V0 conversations: Uses Socket.IO WebSocket via useWsClient
+ * - For V1 conversations: Uses native WebSocket via ConversationWebSocketProvider
+ */
+export function useSendMessage() {
+  const { data: conversation } = useActiveConversation();
+  const { send: v0Send } = useWsClient();
+
+  // Get V1 context (will be null if not in V1 provider)
+  const v1Context = useConversationWebSocket();
+
+  const isV1Conversation = conversation?.conversation_version === "V1";
+
+  const send = useCallback(
+    async (event: Record<string, unknown>) => {
+      if (isV1Conversation && v1Context) {
+        // V1: Convert V0 event format to V1 message format
+        const { action, args } = event as {
+          action: string;
+          args?: {
+            content?: string;
+            image_urls?: string[];
+            file_urls?: string[];
+            timestamp?: string;
+          };
+        };
+
+        if (action === "message" && args?.content) {
+          // Build V1 message content array
+          const content: Array<V1MessageContent> = [
+            {
+              type: "text",
+              text: args.content,
+            },
+          ];
+
+          // Add images if present
+          if (args.image_urls && args.image_urls.length > 0) {
+            args.image_urls.forEach((url) => {
+              content.push({
+                type: "image_url",
+                image_url: { url },
+              });
+            });
+          }
+
+          // Send via V1 WebSocket context (uses correct host/port)
+          await v1Context.sendMessage({
+            role: "user",
+            content,
+          });
+        } else {
+          // For non-message events, fall back to V0 send
+          // (e.g., agent state changes, other control events)
+          v0Send(event);
+        }
+      } else {
+        // V0: Use Socket.IO
+        v0Send(event);
+      }
+    },
+    [isV1Conversation, v1Context, v0Send],
+  );
+
+  return { send };
+}
diff --git a/frontend/src/hooks/use-terminal.ts b/frontend/src/hooks/use-terminal.ts
index f5b4656ac3..1b444a8723 100644
--- a/frontend/src/hooks/use-terminal.ts
+++ b/frontend/src/hooks/use-terminal.ts
@@ -3,10 +3,10 @@ import { Terminal } from "@xterm/xterm";
 import React from "react";
 import { Command, useCommandStore } from "#/state/command-store";
 import { RUNTIME_INACTIVE_STATES } from "#/types/agent-state";
-import { useWsClient } from "#/context/ws-client-provider";
 import { getTerminalCommand } from "#/services/terminal-service";
 import { parseTerminalOutput } from "#/utils/parse-terminal-output";
-import { useAgentStore } from "#/stores/agent-store";
+import { useSendMessage } from "#/hooks/use-send-message";
+import { useAgentState } from "#/hooks/use-agent-state";
 
 /*
   NOTE: Tests for this hook are indirectly covered by the tests for the XTermTerminal component.
@@ -36,8 +36,8 @@ const renderCommand = (
 const persistentLastCommandIndex = { current: 0 };
 
 export const useTerminal = () => {
-  const { send } = useWsClient();
-  const { curAgentState } = useAgentStore();
+  const { send } = useSendMessage();
+  const { curAgentState } = useAgentState();
   const commands = useCommandStore((state) => state.commands);
   const terminal = React.useRef<Terminal | null>(null);
   const fitAddon = React.useRef<FitAddon | null>(null);
diff --git a/frontend/src/hooks/use-unified-websocket-status.ts b/frontend/src/hooks/use-unified-websocket-status.ts
new file mode 100644
index 0000000000..4ad6e45a43
--- /dev/null
+++ b/frontend/src/hooks/use-unified-websocket-status.ts
@@ -0,0 +1,39 @@
+import { useMemo } from "react";
+import { useWsClient, V0_WebSocketStatus } from "#/context/ws-client-provider";
+import { useActiveConversation } from "#/hooks/query/use-active-conversation";
+import { useConversationWebSocket } from "#/contexts/conversation-websocket-context";
+
+/**
+ * Unified hook that returns the current WebSocket status
+ * - For V0 conversations: Returns status from useWsClient
+ * - For V1 conversations: Returns status from ConversationWebSocketProvider
+ */
+export function useUnifiedWebSocketStatus(): V0_WebSocketStatus {
+  const { data: conversation } = useActiveConversation();
+  const v0Status = useWsClient();
+  const v1Context = useConversationWebSocket();
+
+  const isV1Conversation = conversation?.conversation_version === "V1";
+
+  const webSocketStatus = useMemo(() => {
+    if (isV1Conversation) {
+      // Map V1 connection state to WebSocketStatus
+      if (!v1Context) return "DISCONNECTED";
+
+      switch (v1Context.connectionState) {
+        case "OPEN":
+          return "CONNECTED";
+        case "CONNECTING":
+          return "CONNECTING";
+        case "CLOSED":
+        case "CLOSING":
+          return "DISCONNECTED";
+        default:
+          return "DISCONNECTED";
+      }
+    }
+    return v0Status.webSocketStatus;
+  }, [isV1Conversation, v1Context, v0Status.webSocketStatus]);
+
+  return webSocketStatus;
+}
diff --git a/frontend/src/hooks/use-websocket.ts b/frontend/src/hooks/use-websocket.ts
index 644f6f972a..34f46205fd 100644
--- a/frontend/src/hooks/use-websocket.ts
+++ b/frontend/src/hooks/use-websocket.ts
@@ -1,45 +1,78 @@
 import React from "react";
 
+export interface WebSocketHookOptions {
+  queryParams?: Record<string, string | boolean>;
+  onOpen?: (event: Event) => void;
+  onClose?: (event: CloseEvent) => void;
+  onMessage?: (event: MessageEvent) => void;
+  onError?: (event: Event) => void;
+  reconnect?: {
+    enabled?: boolean;
+    maxAttempts?: number;
+  };
+}
+
 export const useWebSocket = <T = string>(
   url: string,
-  options?: {
-    queryParams?: Record<string, string>;
-    onOpen?: (event: Event) => void;
-    onClose?: (event: CloseEvent) => void;
-    onMessage?: (event: MessageEvent) => void;
-    onError?: (event: Event) => void;
-  },
+  options?: WebSocketHookOptions,
 ) => {
   const [isConnected, setIsConnected] = React.useState(false);
   const [lastMessage, setLastMessage] = React.useState<T | null>(null);
   const [messages, setMessages] = React.useState<T[]>([]);
   const [error, setError] = React.useState<Error | null>(null);
+  const [isReconnecting, setIsReconnecting] = React.useState(false);
   const wsRef = React.useRef<WebSocket | null>(null);
+  const attemptCountRef = React.useRef(0);
+  const reconnectTimeoutRef = React.useRef<NodeJS.Timeout | null>(null);
+  const shouldReconnectRef = React.useRef(true); // Only set to false by disconnect()
+  // Track which WebSocket instances are allowed to reconnect using a WeakSet
+  const allowedToReconnectRef = React.useRef<WeakSet<WebSocket>>(new WeakSet());
 
+  // Store options in a ref to avoid reconnecting when callbacks change
+  const optionsRef = React.useRef(options);
   React.useEffect(() => {
+    optionsRef.current = options;
+  }, [options]);
+
+  const connectWebSocket = React.useCallback(() => {
     // Build URL with query parameters if provided
     let wsUrl = url;
-    if (options?.queryParams) {
-      const params = new URLSearchParams(options.queryParams);
+    if (optionsRef.current?.queryParams) {
+      const stringParams = Object.entries(
+        optionsRef.current.queryParams,
+      ).reduce(
+        (acc, [key, value]) => {
+          acc[key] = String(value);
+          return acc;
+        },
+        {} as Record<string, string>,
+      );
+      const params = new URLSearchParams(stringParams);
       wsUrl = `${url}?${params.toString()}`;
     }
 
     const ws = new WebSocket(wsUrl);
     wsRef.current = ws;
+    // Mark this WebSocket instance as allowed to reconnect
+    allowedToReconnectRef.current.add(ws);
 
     ws.onopen = (event) => {
       setIsConnected(true);
       setError(null); // Clear any previous errors
-      options?.onOpen?.(event);
+      setIsReconnecting(false);
+      attemptCountRef.current = 0; // Reset attempt count on successful connection
+      optionsRef.current?.onOpen?.(event);
     };
 
     ws.onmessage = (event) => {
       setLastMessage(event.data);
       setMessages((prev) => [...prev, event.data]);
-      options?.onMessage?.(event);
+      optionsRef.current?.onMessage?.(event);
     };
 
     ws.onclose = (event) => {
+      // Check if this specific WebSocket instance is allowed to reconnect
+      const canReconnect = allowedToReconnectRef.current.has(ws);
       setIsConnected(false);
       // If the connection closes with an error code, treat it as an error
       if (event.code !== 1000) {
@@ -49,21 +82,75 @@ export const useWebSocket = <T = string>(
             `WebSocket closed with code ${event.code}: ${event.reason || "Connection closed unexpectedly"}`,
           ),
         );
-        // Also call onError handler for error closures
-        options?.onError?.(event);
+        // Also call onError handler for error closures (only if allowed to reconnect)
+        if (canReconnect) {
+          optionsRef.current?.onError?.(event);
+        }
+      }
+      optionsRef.current?.onClose?.(event);
+
+      // Attempt reconnection if enabled and allowed
+      // IMPORTANT: Only reconnect if this specific instance is allowed to reconnect
+      const reconnectEnabled = optionsRef.current?.reconnect?.enabled ?? false;
+      const maxAttempts =
+        optionsRef.current?.reconnect?.maxAttempts ?? Infinity;
+
+      if (
+        reconnectEnabled &&
+        canReconnect &&
+        shouldReconnectRef.current &&
+        attemptCountRef.current < maxAttempts
+      ) {
+        setIsReconnecting(true);
+        attemptCountRef.current += 1;
+
+        reconnectTimeoutRef.current = setTimeout(() => {
+          connectWebSocket();
+        }, 3000); // 3 second delay
+      } else {
+        setIsReconnecting(false);
       }
-      options?.onClose?.(event);
     };
 
     ws.onerror = (event) => {
       setIsConnected(false);
-      options?.onError?.(event);
+      optionsRef.current?.onError?.(event);
     };
+  }, [url]);
+
+  React.useEffect(() => {
+    // Reset shouldReconnect flag and attempt count when creating a new connection
+    shouldReconnectRef.current = true;
+    attemptCountRef.current = 0;
+
+    connectWebSocket();
 
     return () => {
-      ws.close();
+      // Disable reconnection on unmount to prevent reconnection attempts
+      // This must be set BEFORE closing the socket, so the onclose handler sees it
+      shouldReconnectRef.current = false;
+      // Clear any pending reconnection timeouts
+      if (reconnectTimeoutRef.current) {
+        clearTimeout(reconnectTimeoutRef.current);
+        reconnectTimeoutRef.current = null;
+      }
+      // Close the WebSocket connection
+      if (wsRef.current) {
+        const { readyState } = wsRef.current;
+        // Remove this WebSocket from the allowed list BEFORE closing
+        // so its onclose handler won't try to reconnect
+        allowedToReconnectRef.current.delete(wsRef.current);
+        // Only close if not already closed/closing
+        if (
+          readyState === WebSocket.CONNECTING ||
+          readyState === WebSocket.OPEN
+        ) {
+          wsRef.current.close();
+        }
+        wsRef.current = null;
+      }
     };
-  }, [url, options]);
+  }, [url, connectWebSocket]);
 
   const sendMessage = React.useCallback(
     (data: string | ArrayBufferLike | Blob | ArrayBufferView) => {
@@ -74,6 +161,20 @@ export const useWebSocket = <T = string>(
     [],
   );
 
+  const disconnect = React.useCallback(() => {
+    shouldReconnectRef.current = false;
+    setIsReconnecting(false);
+    if (reconnectTimeoutRef.current) {
+      clearTimeout(reconnectTimeoutRef.current);
+      reconnectTimeoutRef.current = null;
+    }
+    if (wsRef.current) {
+      // Remove from allowed list before closing
+      allowedToReconnectRef.current.delete(wsRef.current);
+      wsRef.current.close();
+    }
+  }, []);
+
   return {
     isConnected,
     lastMessage,
@@ -81,5 +182,8 @@ export const useWebSocket = <T = string>(
     error,
     socket: wsRef.current,
     sendMessage,
+    isReconnecting,
+    attemptCount: attemptCountRef.current,
+    disconnect,
   };
 };
diff --git a/frontend/src/i18n/declaration.ts b/frontend/src/i18n/declaration.ts
index 67b4e88026..e722897ae7 100644
--- a/frontend/src/i18n/declaration.ts
+++ b/frontend/src/i18n/declaration.ts
@@ -757,6 +757,7 @@ export enum I18nKey {
   COMMON$LEARN = "COMMON$LEARN",
   COMMON$LEARN_SOMETHING_NEW = "COMMON$LEARN_SOMETHING_NEW",
   COMMON$STARTING = "COMMON$STARTING",
+  COMMON$STOPPING = "COMMON$STOPPING",
   MICROAGENT_MANAGEMENT$ERROR = "MICROAGENT_MANAGEMENT$ERROR",
   MICROAGENT_MANAGEMENT$CONVERSATION_STOPPED = "MICROAGENT_MANAGEMENT$CONVERSATION_STOPPED",
   MICROAGENT_MANAGEMENT$LEARN_THIS_REPO_MODAL_TITLE = "MICROAGENT_MANAGEMENT$LEARN_THIS_REPO_MODAL_TITLE",
@@ -918,4 +919,18 @@ export enum I18nKey {
   COMMON$CONFIRMATION_MODE_ENABLED = "COMMON$CONFIRMATION_MODE_ENABLED",
   COMMON$MOST_RECENT = "COMMON$MOST_RECENT",
   HOME$NO_REPOSITORY_FOUND = "HOME$NO_REPOSITORY_FOUND",
+  CONVERSATION$VERSION_V1_NEW = "CONVERSATION$VERSION_V1_NEW",
+  CONVERSATION$VERSION_V0_LEGACY = "CONVERSATION$VERSION_V0_LEGACY",
+  CONVERSATION$ERROR_STARTING_CONVERSATION = "CONVERSATION$ERROR_STARTING_CONVERSATION",
+  CONVERSATION$READY = "CONVERSATION$READY",
+  CONVERSATION$STARTING_CONVERSATION = "CONVERSATION$STARTING_CONVERSATION",
+  CONVERSATION$FAILED_TO_START_FROM_TASK = "CONVERSATION$FAILED_TO_START_FROM_TASK",
+  CONVERSATION$NOT_EXIST_OR_NO_PERMISSION = "CONVERSATION$NOT_EXIST_OR_NO_PERMISSION",
+  CONVERSATION$FAILED_TO_START_WITH_ERROR = "CONVERSATION$FAILED_TO_START_WITH_ERROR",
+  TOAST$STARTING_CONVERSATION = "TOAST$STARTING_CONVERSATION",
+  TOAST$FAILED_TO_START_CONVERSATION = "TOAST$FAILED_TO_START_CONVERSATION",
+  TOAST$CONVERSATION_STARTED = "TOAST$CONVERSATION_STARTED",
+  TOAST$STOPPING_CONVERSATION = "TOAST$STOPPING_CONVERSATION",
+  TOAST$FAILED_TO_STOP_CONVERSATION = "TOAST$FAILED_TO_STOP_CONVERSATION",
+  TOAST$CONVERSATION_STOPPED = "TOAST$CONVERSATION_STOPPED",
 }
diff --git a/frontend/src/i18n/translation.json b/frontend/src/i18n/translation.json
index 5f4b9863a7..64fb117389 100644
--- a/frontend/src/i18n/translation.json
+++ b/frontend/src/i18n/translation.json
@@ -12111,6 +12111,22 @@
     "de": "Wird gestartet",
     "uk": "Запуск"
   },
+  "COMMON$STOPPING": {
+    "en": "Stopping...",
+    "ja": "停止中...",
+    "zh-CN": "停止中...",
+    "zh-TW": "停止中...",
+    "ko-KR": "중지 중...",
+    "no": "Stopper...",
+    "it": "Arresto...",
+    "pt": "Parando...",
+    "es": "Deteniendo...",
+    "ar": "جارٍ الإيقاف...",
+    "fr": "Arrêt...",
+    "tr": "Durduruluyor...",
+    "de": "Wird gestoppt...",
+    "uk": "Зупинка..."
+  },
   "MICROAGENT_MANAGEMENT$ERROR": {
     "en": "The system has encountered an error. Please try again later.",
     "ja": "システムでエラーが発生しました。後でもう一度お試しください。",
@@ -14686,5 +14702,229 @@
     "tr": "Konuşma başlatmak için depo bulunamadı",
     "de": "Kein Repository gefunden, um das Gespräch zu starten",
     "uk": "Не знайдено репозиторій для запуску розмови"
+  },
+  "CONVERSATION$VERSION_V1_NEW": {
+    "en": "Conversation API Version 1 (New)",
+    "ja": "会話API バージョン1（新規）",
+    "zh-CN": "对话API版本1（新）",
+    "zh-TW": "對話API版本1（新）",
+    "ko-KR": "대화 API 버전 1 (신규)",
+    "no": "Samtale-API versjon 1 (Ny)",
+    "it": "API di conversazione versione 1 (Nuova)",
+    "pt": "API de conversa versão 1 (Nova)",
+    "es": "API de conversación versión 1 (Nueva)",
+    "ar": "واجهة برمجة التطبيقات للمحادثة الإصدار 1 (جديد)",
+    "fr": "API de conversation version 1 (Nouvelle)",
+    "tr": "Konuşma API'si Sürüm 1 (Yeni)",
+    "de": "Konversations-API Version 1 (Neu)",
+    "uk": "API розмови версія 1 (Нова)"
+  },
+  "CONVERSATION$VERSION_V0_LEGACY": {
+    "en": "Conversation API Version 0 (Legacy)",
+    "ja": "会話API バージョン0（レガシー）",
+    "zh-CN": "对话API版本0（旧版）",
+    "zh-TW": "對話API版本0（舊版）",
+    "ko-KR": "대화 API 버전 0 (레거시)",
+    "no": "Samtale-API versjon 0 (Gammel)",
+    "it": "API di conversazione versione 0 (Legacy)",
+    "pt": "API de conversa versão 0 (Legado)",
+    "es": "API de conversación versión 0 (Heredada)",
+    "ar": "واجهة برمجة التطبيقات للمحادثة الإصدار 0 (قديم)",
+    "fr": "API de conversation version 0 (Ancienne)",
+    "tr": "Konuşma API'si Sürüm 0 (Eski)",
+    "de": "Konversations-API Version 0 (Legacy)",
+    "uk": "API розмови версія 0 (Застаріла)"
+  },
+  "CONVERSATION$ERROR_STARTING_CONVERSATION": {
+    "en": "Error starting conversation",
+    "ja": "会話の開始エラー",
+    "zh-CN": "启动对话时出错",
+    "zh-TW": "啟動對話時出錯",
+    "ko-KR": "대화 시작 오류",
+    "no": "Feil ved oppstart av samtale",
+    "it": "Errore nell'avvio della conversazione",
+    "pt": "Erro ao iniciar conversa",
+    "es": "Error al iniciar la conversación",
+    "ar": "خطأ في بدء المحادثة",
+    "fr": "Erreur lors du démarrage de la conversation",
+    "tr": "Konuşma başlatılırken hata",
+    "de": "Fehler beim Starten der Konversation",
+    "uk": "Помилка запуску розмови"
+  },
+  "CONVERSATION$READY": {
+    "en": "Ready",
+    "ja": "準備完了",
+    "zh-CN": "就绪",
+    "zh-TW": "就緒",
+    "ko-KR": "준비됨",
+    "no": "Klar",
+    "it": "Pronto",
+    "pt": "Pronto",
+    "es": "Listo",
+    "ar": "جاهز",
+    "fr": "Prêt",
+    "tr": "Hazır",
+    "de": "Bereit",
+    "uk": "Готово"
+  },
+  "CONVERSATION$STARTING_CONVERSATION": {
+    "en": "Starting conversation...",
+    "ja": "会話を開始しています...",
+    "zh-CN": "正在启动对话...",
+    "zh-TW": "正在啟動對話...",
+    "ko-KR": "대화 시작 중...",
+    "no": "Starter samtale...",
+    "it": "Avvio della conversazione...",
+    "pt": "Iniciando conversa...",
+    "es": "Iniciando conversación...",
+    "ar": "بدء المحادثة...",
+    "fr": "Démarrage de la conversation...",
+    "tr": "Konuşma başlatılıyor...",
+    "de": "Konversation wird gestartet...",
+    "uk": "Запуск розмови..."
+  },
+  "CONVERSATION$FAILED_TO_START_FROM_TASK": {
+    "en": "Failed to start the conversation from task.",
+    "ja": "タスクから会話を開始できませんでした。",
+    "zh-CN": "无法从任务启动对话。",
+    "zh-TW": "無法從任務啟動對話。",
+    "ko-KR": "작업에서 대화를 시작하지 못했습니다.",
+    "no": "Kunne ikke starte samtalen fra oppgave.",
+    "it": "Impossibile avviare la conversazione dall'attività.",
+    "pt": "Falha ao iniciar a conversa da tarefa.",
+    "es": "No se pudo iniciar la conversación desde la tarea.",
+    "ar": "فشل بدء المحادثة من المهمة.",
+    "fr": "Échec du démarrage de la conversation depuis la tâche.",
+    "tr": "Görevden konuşma başlatılamadı.",
+    "de": "Konversation konnte nicht aus Aufgabe gestartet werden.",
+    "uk": "Не вдалося запустити розмову із завдання."
+  },
+  "CONVERSATION$NOT_EXIST_OR_NO_PERMISSION": {
+    "en": "This conversation does not exist, or you do not have permission to access it.",
+    "ja": "この会話は存在しないか、アクセスする権限がありません。",
+    "zh-CN": "此对话不存在，或您没有访问权限。",
+    "zh-TW": "此對話不存在，或您沒有訪問權限。",
+    "ko-KR": "이 대화가 존재하지 않거나 액세스 권한이 없습니다.",
+    "no": "Denne samtalen eksisterer ikke, eller du har ikke tillatelse til å få tilgang til den.",
+    "it": "Questa conversazione non esiste o non hai il permesso di accedervi.",
+    "pt": "Esta conversa não existe ou você não tem permissão para acessá-la.",
+    "es": "Esta conversación no existe o no tienes permiso para acceder a ella.",
+    "ar": "هذه المحادثة غير موجودة أو ليس لديك إذن للوصول إليها.",
+    "fr": "Cette conversation n'existe pas ou vous n'avez pas la permission d'y accéder.",
+    "tr": "Bu konuşma mevcut değil veya erişim izniniz yok.",
+    "de": "Diese Konversation existiert nicht oder Sie haben keine Berechtigung darauf zuzugreifen.",
+    "uk": "Ця розмова не існує або у вас немає дозволу на доступ до неї."
+  },
+  "CONVERSATION$FAILED_TO_START_WITH_ERROR": {
+    "en": "Failed to start conversation: {{error}}",
+    "ja": "会話の開始に失敗しました: {{error}}",
+    "zh-CN": "启动对话失败：{{error}}",
+    "zh-TW": "啟動對話失敗：{{error}}",
+    "ko-KR": "대화 시작 실패: {{error}}",
+    "no": "Kunne ikke starte samtale: {{error}}",
+    "it": "Impossibile avviare la conversazione: {{error}}",
+    "pt": "Falha ao iniciar conversa: {{error}}",
+    "es": "No se pudo iniciar la conversación: {{error}}",
+    "ar": "فشل بدء المحادثة: {{error}}",
+    "fr": "Échec du démarrage de la conversation : {{error}}",
+    "tr": "Konuşma başlatılamadı: {{error}}",
+    "de": "Konversation konnte nicht gestartet werden: {{error}}",
+    "uk": "Не вдалося запустити розмову: {{error}}"
+  },
+  "TOAST$STARTING_CONVERSATION": {
+    "en": "Starting conversation...",
+    "ja": "会話を開始しています...",
+    "zh-CN": "正在启动对话...",
+    "zh-TW": "正在啟動對話...",
+    "ko-KR": "대화 시작 중...",
+    "no": "Starter samtale...",
+    "it": "Avvio della conversazione...",
+    "pt": "Iniciando conversa...",
+    "es": "Iniciando conversación...",
+    "ar": "بدء المحادثة...",
+    "fr": "Démarrage de la conversation...",
+    "tr": "Konuşma başlatılıyor...",
+    "de": "Konversation wird gestartet...",
+    "uk": "Запуск розмови..."
+  },
+  "TOAST$FAILED_TO_START_CONVERSATION": {
+    "en": "Failed to start conversation",
+    "ja": "会話の開始に失敗しました",
+    "zh-CN": "启动对话失败",
+    "zh-TW": "啟動對話失敗",
+    "ko-KR": "대화 시작 실패",
+    "no": "Kunne ikke starte samtale",
+    "it": "Impossibile avviare la conversazione",
+    "pt": "Falha ao iniciar conversa",
+    "es": "No se pudo iniciar la conversación",
+    "ar": "فشل بدء المحادثة",
+    "fr": "Échec du démarrage de la conversation",
+    "tr": "Konuşma başlatılamadı",
+    "de": "Konversation konnte nicht gestartet werden",
+    "uk": "Не вдалося запустити розмову"
+  },
+  "TOAST$CONVERSATION_STARTED": {
+    "en": "Conversation started",
+    "ja": "会話が開始されました",
+    "zh-CN": "对话已启动",
+    "zh-TW": "對話已啟動",
+    "ko-KR": "대화가 시작되었습니다",
+    "no": "Samtale startet",
+    "it": "Conversazione avviata",
+    "pt": "Conversa iniciada",
+    "es": "Conversación iniciada",
+    "ar": "بدأت المحادثة",
+    "fr": "Conversation démarrée",
+    "tr": "Konuşma başlatıldı",
+    "de": "Konversation gestartet",
+    "uk": "Розмову запущено"
+  },
+  "TOAST$STOPPING_CONVERSATION": {
+    "en": "Stopping conversation...",
+    "ja": "会話を停止しています...",
+    "zh-CN": "正在停止对话...",
+    "zh-TW": "正在停止對話...",
+    "ko-KR": "대화 중지 중...",
+    "no": "Stopper samtale...",
+    "it": "Arresto della conversazione...",
+    "pt": "Parando conversa...",
+    "es": "Deteniendo conversación...",
+    "ar": "إيقاف المحادثة...",
+    "fr": "Arrêt de la conversation...",
+    "tr": "Konuşma durduruluyor...",
+    "de": "Konversation wird gestoppt...",
+    "uk": "Зупинка розмови..."
+  },
+  "TOAST$FAILED_TO_STOP_CONVERSATION": {
+    "en": "Failed to stop conversation",
+    "ja": "会話の停止に失敗しました",
+    "zh-CN": "停止对话失败",
+    "zh-TW": "停止對話失敗",
+    "ko-KR": "대화 중지 실패",
+    "no": "Kunne ikke stoppe samtale",
+    "it": "Impossibile arrestare la conversazione",
+    "pt": "Falha ao parar conversa",
+    "es": "No se pudo detener la conversación",
+    "ar": "فشل إيقاف المحادثة",
+    "fr": "Échec de l'arrêt de la conversation",
+    "tr": "Konuşma durdurulamadı",
+    "de": "Konversation konnte nicht gestoppt werden",
+    "uk": "Не вдалося зупинити розмову"
+  },
+  "TOAST$CONVERSATION_STOPPED": {
+    "en": "Conversation stopped",
+    "ja": "会話が停止されました",
+    "zh-CN": "对话已停止",
+    "zh-TW": "對話已停止",
+    "ko-KR": "대화가 중지되었습니다",
+    "no": "Samtale stoppet",
+    "it": "Conversazione arrestata",
+    "pt": "Conversa parada",
+    "es": "Conversación detenida",
+    "ar": "توقفت المحادثة",
+    "fr": "Conversation arrêtée",
+    "tr": "Konuşma durduruldu",
+    "de": "Konversation gestoppt",
+    "uk": "Розмову зупинено"
   }
 }
diff --git a/frontend/src/mocks/mock-ws-helpers.ts b/frontend/src/mocks/mock-ws-helpers.ts
index 7bf575eb25..c3205b7731 100644
--- a/frontend/src/mocks/mock-ws-helpers.ts
+++ b/frontend/src/mocks/mock-ws-helpers.ts
@@ -128,3 +128,59 @@ export const createMockAgentErrorEvent = (
   error: "Failed to execute command: Permission denied",
   ...overrides,
 });
+
+/**
+ * Creates a mock ExecuteBashAction event for testing terminal command handling
+ */
+export const createMockExecuteBashActionEvent = (
+  command: string = "ls -la",
+) => ({
+  id: "bash-action-123",
+  timestamp: new Date().toISOString(),
+  source: "agent",
+  thought: [{ type: "text", text: "Executing bash command" }],
+  thinking_blocks: [],
+  action: {
+    kind: "ExecuteBashAction",
+    command,
+    is_input: false,
+    timeout: null,
+    reset: false,
+  },
+  tool_name: "ExecuteBashAction",
+  tool_call_id: "bash-call-456",
+  tool_call: {
+    id: "bash-call-456",
+    type: "function",
+    function: {
+      name: "ExecuteBashAction",
+      arguments: JSON.stringify({ command }),
+    },
+  },
+  llm_response_id: "llm-response-789",
+  security_risk: { level: "low" },
+});
+
+/**
+ * Creates a mock ExecuteBashObservation event for testing terminal output handling
+ */
+export const createMockExecuteBashObservationEvent = (
+  output: string = "total 24\ndrwxr-xr-x  5 user  staff  160 Jan 10 12:00 .",
+  command: string = "ls -la",
+) => ({
+  id: "bash-obs-123",
+  timestamp: new Date().toISOString(),
+  source: "environment",
+  tool_name: "ExecuteBashAction",
+  tool_call_id: "bash-call-456",
+  observation: {
+    kind: "ExecuteBashObservation",
+    output,
+    command,
+    exit_code: 0,
+    error: false,
+    timeout: false,
+    metadata: { cwd: "/home/user" },
+  },
+  action_id: "bash-action-123",
+});
diff --git a/frontend/src/routes/changes-tab.tsx b/frontend/src/routes/changes-tab.tsx
index 325b23c513..620e179389 100644
--- a/frontend/src/routes/changes-tab.tsx
+++ b/frontend/src/routes/changes-tab.tsx
@@ -6,7 +6,7 @@ import { useGetGitChanges } from "#/hooks/query/use-get-git-changes";
 import { I18nKey } from "#/i18n/declaration";
 import { RUNTIME_INACTIVE_STATES } from "#/types/agent-state";
 import { RandomTip } from "#/components/features/tips/random-tip";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 
 // Error message patterns
 const GIT_REPO_ERROR_PATTERN = /not a git repository/i;
@@ -33,7 +33,7 @@ function GitChanges() {
     null,
   );
 
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
   const runtimeIsActive = !RUNTIME_INACTIVE_STATES.includes(curAgentState);
 
   const isNotGitRepoError =
diff --git a/frontend/src/routes/conversation.tsx b/frontend/src/routes/conversation.tsx
index 4952ff225e..1d1b2cbb5e 100644
--- a/frontend/src/routes/conversation.tsx
+++ b/frontend/src/routes/conversation.tsx
@@ -1,10 +1,9 @@
 import React from "react";
 import { useNavigate } from "react-router";
-import { useQueryClient } from "@tanstack/react-query";
+import { useTranslation } from "react-i18next";
 
 import { useConversationId } from "#/hooks/use-conversation-id";
 import { useCommandStore } from "#/state/command-store";
-import { useEffectOnce } from "#/hooks/use-effect-once";
 import { useJupyterStore } from "#/state/jupyter-store";
 import { useConversationStore } from "#/state/conversation-store";
 import { useAgentStore } from "#/stores/agent-store";
@@ -15,6 +14,7 @@ import { EventHandler } from "../wrapper/event-handler";
 import { useConversationConfig } from "#/hooks/query/use-conversation-config";
 
 import { useActiveConversation } from "#/hooks/query/use-active-conversation";
+import { useTaskPolling } from "#/hooks/query/use-task-polling";
 
 import { displayErrorToast } from "#/utils/custom-toast-handlers";
 import { useDocumentTitleFromState } from "#/hooks/use-document-title-from-state";
@@ -26,15 +26,23 @@ import { ConversationMain } from "#/components/features/conversation/conversatio
 import { ConversationName } from "#/components/features/conversation/conversation-name";
 
 import { ConversationTabs } from "#/components/features/conversation/conversation-tabs/conversation-tabs";
-import { useStartConversation } from "#/hooks/mutation/use-start-conversation";
 import { WebSocketProviderWrapper } from "#/contexts/websocket-provider-wrapper";
+import { useErrorMessageStore } from "#/stores/error-message-store";
+import { useUnifiedResumeConversationSandbox } from "#/hooks/mutation/use-unified-start-conversation";
+import { I18nKey } from "#/i18n/declaration";
 
 function AppContent() {
   useConversationConfig();
 
+  const { t } = useTranslation();
   const { conversationId } = useConversationId();
+
+  // Handle both task IDs (task-{uuid}) and regular conversation IDs
+  const { isTask, taskStatus, taskDetail } = useTaskPolling();
+
   const { data: conversation, isFetched, refetch } = useActiveConversation();
-  const { mutate: startConversation } = useStartConversation();
+  const { mutate: startConversation, isPending: isStarting } =
+    useUnifiedResumeConversationSandbox();
   const { data: isAuthed } = useIsAuthed();
   const { providers } = useUserProviders();
   const { resetConversationState } = useConversationStore();
@@ -44,7 +52,12 @@ function AppContent() {
     (state) => state.setCurrentAgentState,
   );
   const clearJupyter = useJupyterStore((state) => state.clearJupyter);
-  const queryClient = useQueryClient();
+  const removeErrorMessage = useErrorMessageStore(
+    (state) => state.removeErrorMessage,
+  );
+
+  // Track which conversation ID we've auto-started to prevent auto-restart after manual stop
+  const processedConversationId = React.useRef<string | null>(null);
 
   // Fetch batch feedback data when conversation is loaded
   useBatchFeedback();
@@ -52,76 +65,123 @@ function AppContent() {
   // Set the document title to the conversation title when available
   useDocumentTitleFromState();
 
-  // Force fresh conversation data when navigating to prevent stale cache issues
+  // 1. Cleanup Effect - runs when navigating to a different conversation
   React.useEffect(() => {
-    queryClient.invalidateQueries({
-      queryKey: ["user", "conversation", conversationId],
-    });
-  }, [conversationId, queryClient]);
+    clearTerminal();
+    clearJupyter();
+    resetConversationState();
+    setCurrentAgentState(AgentState.LOADING);
+    removeErrorMessage();
 
+    // Reset tracking ONLY if we're navigating to a DIFFERENT conversation
+    // Don't reset on StrictMode remounts (conversationId is the same)
+    if (processedConversationId.current !== conversationId) {
+      processedConversationId.current = null;
+    }
+  }, [
+    conversationId,
+    clearTerminal,
+    clearJupyter,
+    resetConversationState,
+    setCurrentAgentState,
+    removeErrorMessage,
+  ]);
+
+  // 2. Task Error Display Effect
   React.useEffect(() => {
-    if (isFetched && !conversation && isAuthed) {
+    if (isTask && taskStatus === "ERROR") {
       displayErrorToast(
-        "This conversation does not exist, or you do not have permission to access it.",
+        taskDetail || t(I18nKey.CONVERSATION$FAILED_TO_START_FROM_TASK),
       );
+    }
+  }, [isTask, taskStatus, taskDetail, t]);
+
+  // 3. Auto-start Effect - handles conversation not found and auto-starting STOPPED conversations
+  React.useEffect(() => {
+    // Wait for data to be fetched
+    if (!isFetched || !isAuthed) return;
+
+    // Handle conversation not found
+    if (!conversation) {
+      displayErrorToast(t(I18nKey.CONVERSATION$NOT_EXIST_OR_NO_PERMISSION));
       navigate("/");
-    } else if (conversation?.status === "STOPPED") {
-      // If conversation is STOPPED, attempt to start it
+      return;
+    }
+
+    const currentConversationId = conversation.conversation_id;
+    const currentStatus = conversation.status;
+
+    // Skip if we've already processed this conversation
+    if (processedConversationId.current === currentConversationId) {
+      return;
+    }
+
+    // Mark as processed immediately to prevent duplicate calls
+    processedConversationId.current = currentConversationId;
+
+    // Auto-start STOPPED conversations on initial load only
+    if (currentStatus === "STOPPED" && !isStarting) {
       startConversation(
-        { conversationId: conversation.conversation_id, providers },
+        { conversationId: currentConversationId, providers },
         {
           onError: (error) => {
-            displayErrorToast(`Failed to start conversation: ${error.message}`);
-            // Refetch the conversation to ensure UI consistency
+            displayErrorToast(
+              t(I18nKey.CONVERSATION$FAILED_TO_START_WITH_ERROR, {
+                error: error.message,
+              }),
+            );
             refetch();
           },
         },
       );
     }
+    // NOTE: conversation?.status is intentionally NOT in dependencies
+    // We only want to run when conversation ID changes, not when status changes
+    // This prevents duplicate calls when stale cache data is replaced with fresh data
   }, [
     conversation?.conversation_id,
-    conversation?.status,
     isFetched,
     isAuthed,
+    isStarting,
     providers,
+    startConversation,
+    navigate,
+    refetch,
+    t,
   ]);
 
-  React.useEffect(() => {
-    clearTerminal();
-    clearJupyter();
-    resetConversationState();
-    setCurrentAgentState(AgentState.LOADING);
-  }, [
-    conversationId,
-    clearTerminal,
-    setCurrentAgentState,
-    resetConversationState,
-  ]);
+  const isV1Conversation = conversation?.conversation_version === "V1";
 
-  useEffectOnce(() => {
-    clearTerminal();
-    clearJupyter();
-    resetConversationState();
-    setCurrentAgentState(AgentState.LOADING);
-  });
+  const content = (
+    <ConversationSubscriptionsProvider>
+      <EventHandler>
+        <div
+          data-testid="app-route"
+          className="p-3 md:p-0 flex flex-col h-full gap-3"
+        >
+          <div className="flex flex-col lg:flex-row lg:items-center justify-between gap-4.5 pt-2 lg:pt-0">
+            <ConversationName />
+            <ConversationTabs />
+          </div>
+
+          <ConversationMain />
+        </div>
+      </EventHandler>
+    </ConversationSubscriptionsProvider>
+  );
+
+  // Wait for conversation data to load before rendering WebSocket provider
+  // This prevents the provider from unmounting/remounting when version changes from 0 to 1
+  if (!conversation) {
+    return content;
+  }
 
   return (
-    <WebSocketProviderWrapper version={0} conversationId={conversationId}>
-      <ConversationSubscriptionsProvider>
-        <EventHandler>
-          <div
-            data-testid="app-route"
-            className="p-3 md:p-0 flex flex-col h-full gap-3"
-          >
-            <div className="flex flex-col lg:flex-row lg:items-center justify-between gap-4.5 pt-2 lg:pt-0">
-              <ConversationName />
-              <ConversationTabs />
-            </div>
-
-            <ConversationMain />
-          </div>
-        </EventHandler>
-      </ConversationSubscriptionsProvider>
+    <WebSocketProviderWrapper
+      version={isV1Conversation ? 1 : 0}
+      conversationId={conversationId}
+    >
+      {content}
     </WebSocketProviderWrapper>
   );
 }
diff --git a/frontend/src/routes/vscode-tab.tsx b/frontend/src/routes/vscode-tab.tsx
index 6be68d108a..fe72079e6f 100644
--- a/frontend/src/routes/vscode-tab.tsx
+++ b/frontend/src/routes/vscode-tab.tsx
@@ -5,12 +5,12 @@ import { RUNTIME_INACTIVE_STATES } from "#/types/agent-state";
 import { useVSCodeUrl } from "#/hooks/query/use-vscode-url";
 import { VSCODE_IN_NEW_TAB } from "#/utils/feature-flags";
 import { WaitingForRuntimeMessage } from "#/components/features/chat/waiting-for-runtime-message";
-import { useAgentStore } from "#/stores/agent-store";
+import { useAgentState } from "#/hooks/use-agent-state";
 
 function VSCodeTab() {
   const { t } = useTranslation();
   const { data, isLoading, error } = useVSCodeUrl();
-  const { curAgentState } = useAgentStore();
+  const { curAgentState } = useAgentState();
   const isRuntimeInactive = RUNTIME_INACTIVE_STATES.includes(curAgentState);
   const iframeRef = React.useRef<HTMLIFrameElement>(null);
   const [isCrossProtocol, setIsCrossProtocol] = useState(false);
diff --git a/frontend/src/stores/v1-conversation-state-store.ts b/frontend/src/stores/v1-conversation-state-store.ts
new file mode 100644
index 0000000000..8c6478cc48
--- /dev/null
+++ b/frontend/src/stores/v1-conversation-state-store.ts
@@ -0,0 +1,26 @@
+import { create } from "zustand";
+import { V1AgentStatus } from "#/types/v1/core/base/common";
+
+interface V1ConversationStateStore {
+  agent_status: V1AgentStatus | null;
+
+  /**
+   * Set the agent status
+   */
+  setAgentStatus: (agent_status: V1AgentStatus) => void;
+
+  /**
+   * Reset the store to initial state
+   */
+  reset: () => void;
+}
+
+export const useV1ConversationStateStore = create<V1ConversationStateStore>(
+  (set) => ({
+    agent_status: null,
+
+    setAgentStatus: (agent_status: V1AgentStatus) => set({ agent_status }),
+
+    reset: () => set({ agent_status: null }),
+  }),
+);
diff --git a/frontend/src/types/v1/core/base/action.ts b/frontend/src/types/v1/core/base/action.ts
index 3147332696..ce08d5a1b9 100644
--- a/frontend/src/types/v1/core/base/action.ts
+++ b/frontend/src/types/v1/core/base/action.ts
@@ -1,28 +1,28 @@
 import { ActionBase } from "./base";
 import { TaskItem } from "./common";
 
-interface MCPToolAction extends ActionBase<"MCPToolAction"> {
+export interface MCPToolAction extends ActionBase<"MCPToolAction"> {
   /**
    * Dynamic data fields from the tool call
    */
   data: Record<string, unknown>;
 }
 
-interface FinishAction extends ActionBase<"FinishAction"> {
+export interface FinishAction extends ActionBase<"FinishAction"> {
   /**
    * Final message to send to the user
    */
   message: string;
 }
 
-interface ThinkAction extends ActionBase<"ThinkAction"> {
+export interface ThinkAction extends ActionBase<"ThinkAction"> {
   /**
    * The thought to log
    */
   thought: string;
 }
 
-interface ExecuteBashAction extends ActionBase<"ExecuteBashAction"> {
+export interface ExecuteBashAction extends ActionBase<"ExecuteBashAction"> {
   /**
    * The bash command to execute. Can be empty string to view additional logs when previous exit code is `-1`. Can be `C-c` (Ctrl+C) to interrupt the currently running process.
    */
@@ -41,7 +41,7 @@ interface ExecuteBashAction extends ActionBase<"ExecuteBashAction"> {
   reset: boolean;
 }
 
-interface StrReplaceEditorAction extends ActionBase<"StrReplaceEditorAction"> {
+export interface FileEditorAction extends ActionBase<"FileEditorAction"> {
   /**
    * The commands to run. Allowed options are: `view`, `create`, `str_replace`, `insert`, `undo_edit`.
    */
@@ -72,7 +72,39 @@ interface StrReplaceEditorAction extends ActionBase<"StrReplaceEditorAction"> {
   view_range: [number, number] | null;
 }
 
-interface TaskTrackerAction extends ActionBase<"TaskTrackerAction"> {
+export interface StrReplaceEditorAction
+  extends ActionBase<"StrReplaceEditorAction"> {
+  /**
+   * The commands to run. Allowed options are: `view`, `create`, `str_replace`, `insert`, `undo_edit`.
+   */
+  command: "view" | "create" | "str_replace" | "insert" | "undo_edit";
+  /**
+   * Absolute path to file or directory.
+   */
+  path: string;
+  /**
+   * Required parameter of `create` command, with the content of the file to be created.
+   */
+  file_text: string | null;
+  /**
+   * Required parameter of `str_replace` command containing the string in `path` to replace.
+   */
+  old_str: string | null;
+  /**
+   * Optional parameter of `str_replace` command containing the new string (if not given, no string will be added). Required parameter of `insert` command containing the string to insert.
+   */
+  new_str: string | null;
+  /**
+   * Required parameter of `insert` command. The `new_str` will be inserted AFTER the line `insert_line` of `path`. Must be >= 1.
+   */
+  insert_line: number | null;
+  /**
+   * Optional parameter of `view` command when `path` points to a file. If none is given, the full file is shown. If provided, the file will be shown in the indicated line number range, e.g. [11, 12] will show lines 11 and 12. Indexing at 1 to start. Setting `[start_line, -1]` shows all lines from `start_line` to the end of the file.
+   */
+  view_range: [number, number] | null;
+}
+
+export interface TaskTrackerAction extends ActionBase<"TaskTrackerAction"> {
   /**
    * The command to execute. `view` shows the current task list. `plan` creates or updates the task list based on provided requirements and progress. Always `view` the current list before making changes.
    */
@@ -83,7 +115,8 @@ interface TaskTrackerAction extends ActionBase<"TaskTrackerAction"> {
   task_list: TaskItem[];
 }
 
-interface BrowserNavigateAction extends ActionBase<"BrowserNavigateAction"> {
+export interface BrowserNavigateAction
+  extends ActionBase<"BrowserNavigateAction"> {
   /**
    * The URL to navigate to
    */
@@ -94,7 +127,7 @@ interface BrowserNavigateAction extends ActionBase<"BrowserNavigateAction"> {
   new_tab: boolean;
 }
 
-interface BrowserClickAction extends ActionBase<"BrowserClickAction"> {
+export interface BrowserClickAction extends ActionBase<"BrowserClickAction"> {
   /**
    * The index of the element to click (from browser_get_state)
    */
@@ -105,7 +138,7 @@ interface BrowserClickAction extends ActionBase<"BrowserClickAction"> {
   new_tab: boolean;
 }
 
-interface BrowserTypeAction extends ActionBase<"BrowserTypeAction"> {
+export interface BrowserTypeAction extends ActionBase<"BrowserTypeAction"> {
   /**
    * The index of the input element (from browser_get_state)
    */
@@ -116,14 +149,15 @@ interface BrowserTypeAction extends ActionBase<"BrowserTypeAction"> {
   text: string;
 }
 
-interface BrowserGetStateAction extends ActionBase<"BrowserGetStateAction"> {
+export interface BrowserGetStateAction
+  extends ActionBase<"BrowserGetStateAction"> {
   /**
    * Whether to include a screenshot of the current page. Default: False
    */
   include_screenshot: boolean;
 }
 
-interface BrowserGetContentAction
+export interface BrowserGetContentAction
   extends ActionBase<"BrowserGetContentAction"> {
   /**
    * Whether to include links in the content (default: False)
@@ -135,29 +169,32 @@ interface BrowserGetContentAction
   start_from_char: number;
 }
 
-interface BrowserScrollAction extends ActionBase<"BrowserScrollAction"> {
+export interface BrowserScrollAction extends ActionBase<"BrowserScrollAction"> {
   /**
    * Direction to scroll. Options: 'up', 'down'. Default: 'down'
    */
   direction: "up" | "down";
 }
 
-interface BrowserGoBackAction extends ActionBase<"BrowserGoBackAction"> {
+export interface BrowserGoBackAction extends ActionBase<"BrowserGoBackAction"> {
   // No additional properties - this action has no parameters
 }
 
-interface BrowserListTabsAction extends ActionBase<"BrowserListTabsAction"> {
+export interface BrowserListTabsAction
+  extends ActionBase<"BrowserListTabsAction"> {
   // No additional properties - this action has no parameters
 }
 
-interface BrowserSwitchTabAction extends ActionBase<"BrowserSwitchTabAction"> {
+export interface BrowserSwitchTabAction
+  extends ActionBase<"BrowserSwitchTabAction"> {
   /**
    * 4 Character Tab ID of the tab to switch to (from browser_list_tabs)
    */
   tab_id: string;
 }
 
-interface BrowserCloseTabAction extends ActionBase<"BrowserCloseTabAction"> {
+export interface BrowserCloseTabAction
+  extends ActionBase<"BrowserCloseTabAction"> {
   /**
    * 4 Character Tab ID of the tab to close (from browser_list_tabs)
    */
@@ -169,6 +206,7 @@ export type Action =
   | FinishAction
   | ThinkAction
   | ExecuteBashAction
+  | FileEditorAction
   | StrReplaceEditorAction
   | TaskTrackerAction
   | BrowserNavigateAction
diff --git a/frontend/src/types/v1/core/base/base.ts b/frontend/src/types/v1/core/base/base.ts
index e7e806ae39..5925e8599d 100644
--- a/frontend/src/types/v1/core/base/base.ts
+++ b/frontend/src/types/v1/core/base/base.ts
@@ -3,6 +3,7 @@ type EventType =
   | "Finish"
   | "Think"
   | "ExecuteBash"
+  | "FileEditor"
   | "StrReplaceEditor"
   | "TaskTracker";
 
diff --git a/frontend/src/types/v1/core/base/common.ts b/frontend/src/types/v1/core/base/common.ts
index 2215764cc0..ae151286d1 100644
--- a/frontend/src/types/v1/core/base/common.ts
+++ b/frontend/src/types/v1/core/base/common.ts
@@ -63,6 +63,17 @@ export enum SecurityRisk {
   HIGH = "HIGH",
 }
 
+// Agent status
+export enum V1AgentStatus {
+  IDLE = "idle",
+  RUNNING = "running",
+  PAUSED = "paused",
+  WAITING_FOR_CONFIRMATION = "waiting_for_confirmation",
+  FINISHED = "finished",
+  ERROR = "error",
+  STUCK = "stuck",
+}
+
 // Content types for LLM messages
 export interface TextContent {
   type: "text";
diff --git a/frontend/src/types/v1/core/base/observation.ts b/frontend/src/types/v1/core/base/observation.ts
index df4ab5c88c..5433087548 100644
--- a/frontend/src/types/v1/core/base/observation.ts
+++ b/frontend/src/types/v1/core/base/observation.ts
@@ -6,7 +6,8 @@ import {
   ImageContent,
 } from "./common";
 
-interface MCPToolObservation extends ObservationBase<"MCPToolObservation"> {
+export interface MCPToolObservation
+  extends ObservationBase<"MCPToolObservation"> {
   /**
    * Content returned from the MCP tool converted to LLM Ready TextContent or ImageContent
    */
@@ -21,21 +22,23 @@ interface MCPToolObservation extends ObservationBase<"MCPToolObservation"> {
   tool_name: string;
 }
 
-interface FinishObservation extends ObservationBase<"FinishObservation"> {
+export interface FinishObservation
+  extends ObservationBase<"FinishObservation"> {
   /**
    * Final message sent to the user
    */
   message: string;
 }
 
-interface ThinkObservation extends ObservationBase<"ThinkObservation"> {
+export interface ThinkObservation extends ObservationBase<"ThinkObservation"> {
   /**
    * Confirmation message. DEFAULT: "Your thought has been logged."
    */
   content: string;
 }
 
-interface BrowserObservation extends ObservationBase<"BrowserObservation"> {
+export interface BrowserObservation
+  extends ObservationBase<"BrowserObservation"> {
   /**
    * The output message from the browser operation
    */
@@ -50,7 +53,7 @@ interface BrowserObservation extends ObservationBase<"BrowserObservation"> {
   screenshot_data: string | null;
 }
 
-interface ExecuteBashObservation
+export interface ExecuteBashObservation
   extends ObservationBase<"ExecuteBashObservation"> {
   /**
    * The raw output from the tool.
@@ -78,7 +81,40 @@ interface ExecuteBashObservation
   metadata: CmdOutputMetadata;
 }
 
-interface StrReplaceEditorObservation
+export interface FileEditorObservation
+  extends ObservationBase<"FileEditorObservation"> {
+  /**
+   * The commands to run. Allowed options are: `view`, `create`, `str_replace`, `insert`, `undo_edit`.
+   */
+  command: "view" | "create" | "str_replace" | "insert" | "undo_edit";
+  /**
+   * The output message from the tool for the LLM to see.
+   */
+  output: string;
+  /**
+   * The file path that was edited.
+   */
+  path: string | null;
+  /**
+   * Indicates if the file previously existed. If not, it was created.
+   */
+  prev_exist: boolean;
+  /**
+   * The content of the file before the edit.
+   */
+  old_content: string | null;
+  /**
+   * The content of the file after the edit.
+   */
+  new_content: string | null;
+  /**
+   * Error message if any.
+   */
+  error: string | null;
+}
+
+// Keep StrReplaceEditorObservation as a separate interface for backward compatibility
+export interface StrReplaceEditorObservation
   extends ObservationBase<"StrReplaceEditorObservation"> {
   /**
    * The commands to run. Allowed options are: `view`, `create`, `str_replace`, `insert`, `undo_edit`.
@@ -110,7 +146,7 @@ interface StrReplaceEditorObservation
   error: string | null;
 }
 
-interface TaskTrackerObservation
+export interface TaskTrackerObservation
   extends ObservationBase<"TaskTrackerObservation"> {
   /**
    * The formatted task list or status message.
@@ -132,5 +168,6 @@ export type Observation =
   | ThinkObservation
   | BrowserObservation
   | ExecuteBashObservation
+  | FileEditorObservation
   | StrReplaceEditorObservation
   | TaskTrackerObservation;
diff --git a/frontend/src/types/v1/core/events/action-event.ts b/frontend/src/types/v1/core/events/action-event.ts
index 0c5e30c81f..33d7ce647c 100644
--- a/frontend/src/types/v1/core/events/action-event.ts
+++ b/frontend/src/types/v1/core/events/action-event.ts
@@ -7,7 +7,7 @@ import {
   RedactedThinkingBlock,
 } from "../base/event";
 
-export interface ActionEvent extends BaseEvent {
+export interface ActionEvent<T extends Action = Action> extends BaseEvent {
   /**
    * The thought process of the agent before taking this action
    */
@@ -26,7 +26,7 @@ export interface ActionEvent extends BaseEvent {
   /**
    * Single action (tool call) returned by LLM
    */
-  action: Action;
+  action: T;
 
   /**
    * The name of the tool being called
diff --git a/frontend/src/types/v1/core/events/conversation-state-event.ts b/frontend/src/types/v1/core/events/conversation-state-event.ts
index 9e52cbc633..b7d74c0dec 100644
--- a/frontend/src/types/v1/core/events/conversation-state-event.ts
+++ b/frontend/src/types/v1/core/events/conversation-state-event.ts
@@ -1,7 +1,15 @@
 import { BaseEvent } from "../base/event";
+import { V1AgentStatus } from "../base/common";
 
-// Conversation state update event - contains conversation state updates
-export interface ConversationStateUpdateEvent extends BaseEvent {
+/**
+ * Conversation state value types
+ */
+export interface ConversationState {
+  agent_status: V1AgentStatus;
+  // Add other conversation state fields here as needed
+}
+
+interface ConversationStateUpdateEventBase extends BaseEvent {
   /**
    * The source is always "environment" for conversation state update events
    */
@@ -11,12 +19,29 @@ export interface ConversationStateUpdateEvent extends BaseEvent {
    * Unique key for this state update event.
    * Can be "full_state" for full state snapshots or field names for partial updates.
    */
-  key: string;
+  key: "full_state" | "agent_status"; // Extend with other keys as needed
 
   /**
-   * Serialized conversation state updates.
-   * For "full_state" key, this contains the complete conversation state.
-   * For field-specific keys, this contains the updated field value.
+   * Conversation state updates
    */
-  value: unknown;
+  value: ConversationState | V1AgentStatus;
 }
+
+// Narrowed interfaces for full state update event
+export interface ConversationStateUpdateEventFullState
+  extends ConversationStateUpdateEventBase {
+  key: "full_state";
+  value: ConversationState;
+}
+
+// Narrowed interface for agent status update event
+export interface ConversationStateUpdateEventAgentStatus
+  extends ConversationStateUpdateEventBase {
+  key: "agent_status";
+  value: V1AgentStatus;
+}
+
+// Conversation state update event - contains conversation state updates
+export type ConversationStateUpdateEvent =
+  | ConversationStateUpdateEventFullState
+  | ConversationStateUpdateEventAgentStatus;
diff --git a/frontend/src/types/v1/core/events/observation-event.ts b/frontend/src/types/v1/core/events/observation-event.ts
index 011108372e..62750d7289 100644
--- a/frontend/src/types/v1/core/events/observation-event.ts
+++ b/frontend/src/types/v1/core/events/observation-event.ts
@@ -21,11 +21,12 @@ export interface ObservationBaseEvent extends BaseEvent {
 }
 
 // Main observation event interface
-export interface ObservationEvent extends ObservationBaseEvent {
+export interface ObservationEvent<T extends Observation = Observation>
+  extends ObservationBaseEvent {
   /**
    * The observation (tool call) sent to LLM
    */
-  observation: Observation;
+  observation: T;
 
   /**
    * The action id that this observation is responding to
diff --git a/frontend/src/types/v1/type-guards.ts b/frontend/src/types/v1/type-guards.ts
index de3c9b45f3..1d3973cfa6 100644
--- a/frontend/src/types/v1/type-guards.ts
+++ b/frontend/src/types/v1/type-guards.ts
@@ -1,7 +1,18 @@
-import { OpenHandsEvent, ObservationEvent, BaseEvent } from "./core";
+import {
+  OpenHandsEvent,
+  ObservationEvent,
+  BaseEvent,
+  ExecuteBashAction,
+  ExecuteBashObservation,
+} from "./core";
 import { AgentErrorEvent } from "./core/events/observation-event";
 import { MessageEvent } from "./core/events/message-event";
 import { ActionEvent } from "./core/events/action-event";
+import {
+  ConversationStateUpdateEvent,
+  ConversationStateUpdateEventAgentStatus,
+  ConversationStateUpdateEventFullState,
+} from "./core/events/conversation-state-event";
 import type { OpenHandsParsedEvent } from "../core/index";
 
 /**
@@ -51,17 +62,23 @@ export const isAgentErrorEvent = (
   typeof event.tool_call_id === "string" &&
   typeof event.error === "string";
 
+/**
+ * Type guard function to check if an event is a message event (user or assistant)
+ */
+export const isMessageEvent = (event: OpenHandsEvent): event is MessageEvent =>
+  "llm_message" in event &&
+  typeof event.llm_message === "object" &&
+  event.llm_message !== null &&
+  "role" in event.llm_message &&
+  "content" in event.llm_message;
+
 /**
  * Type guard function to check if an event is a user message event
  */
 export const isUserMessageEvent = (
   event: OpenHandsEvent,
 ): event is MessageEvent =>
-  "llm_message" in event &&
-  typeof event.llm_message === "object" &&
-  event.llm_message !== null &&
-  "role" in event.llm_message &&
-  event.llm_message.role === "user";
+  isMessageEvent(event) && event.llm_message.role === "user";
 
 /**
  * Type guard function to check if an event is an action event
@@ -74,6 +91,40 @@ export const isActionEvent = (event: OpenHandsEvent): event is ActionEvent =>
   typeof event.tool_name === "string" &&
   typeof event.tool_call_id === "string";
 
+/**
+ * Type guard function to check if an action event is an ExecuteBashAction
+ */
+export const isExecuteBashActionEvent = (
+  event: OpenHandsEvent,
+): event is ActionEvent<ExecuteBashAction> =>
+  isActionEvent(event) && event.action.kind === "ExecuteBashAction";
+
+/**
+ * Type guard function to check if an observation event is an ExecuteBashObservation
+ */
+export const isExecuteBashObservationEvent = (
+  event: OpenHandsEvent,
+): event is ObservationEvent<ExecuteBashObservation> =>
+  isObservationEvent(event) &&
+  event.observation.kind === "ExecuteBashObservation";
+
+/**
+ * Type guard function to check if an event is a conversation state update event
+ */
+export const isConversationStateUpdateEvent = (
+  event: OpenHandsEvent,
+): event is ConversationStateUpdateEvent =>
+  "kind" in event && event.kind === "ConversationStateUpdateEvent";
+
+export const isFullStateConversationStateUpdateEvent = (
+  event: ConversationStateUpdateEvent,
+): event is ConversationStateUpdateEventFullState => event.key === "full_state";
+
+export const isAgentStatusConversationStateUpdateEvent = (
+  event: ConversationStateUpdateEvent,
+): event is ConversationStateUpdateEventAgentStatus =>
+  event.key === "agent_status";
+
 // =============================================================================
 // TEMPORARY COMPATIBILITY TYPE GUARDS
 // These will be removed once we fully migrate to V1 events
diff --git a/frontend/src/utils/feature-flags.ts b/frontend/src/utils/feature-flags.ts
index db98c2d221..c97c06fcfd 100644
--- a/frontend/src/utils/feature-flags.ts
+++ b/frontend/src/utils/feature-flags.ts
@@ -17,3 +17,5 @@ export const HIDE_LLM_SETTINGS = () => loadFeatureFlag("HIDE_LLM_SETTINGS");
 export const VSCODE_IN_NEW_TAB = () => loadFeatureFlag("VSCODE_IN_NEW_TAB");
 export const ENABLE_TRAJECTORY_REPLAY = () =>
   loadFeatureFlag("TRAJECTORY_REPLAY");
+export const USE_V1_CONVERSATION_API = () =>
+  loadFeatureFlag("USE_V1_CONVERSATION_API");
diff --git a/frontend/src/utils/status.ts b/frontend/src/utils/status.ts
index 3df5ee57cd..11c0314824 100644
--- a/frontend/src/utils/status.ts
+++ b/frontend/src/utils/status.ts
@@ -1,4 +1,4 @@
-import { WebSocketStatus } from "#/context/ws-client-provider";
+import { V0_WebSocketStatus } from "#/context/ws-client-provider";
 import { I18nKey } from "#/i18n/declaration";
 import { AgentState } from "#/types/agent-state";
 import { ConversationStatus } from "#/types/conversation-status";
@@ -43,7 +43,7 @@ export const AGENT_STATUS_MAP: {
 };
 
 export function getIndicatorColor(
-  webSocketStatus: WebSocketStatus,
+  webSocketStatus: V0_WebSocketStatus,
   conversationStatus: ConversationStatus | null,
   runtimeStatus: RuntimeStatus | null,
   agentState: AgentState | null,
@@ -99,7 +99,7 @@ export function getIndicatorColor(
 
 export function getStatusCode(
   statusMessage: StatusMessage,
-  webSocketStatus: WebSocketStatus,
+  webSocketStatus: V0_WebSocketStatus,
   conversationStatus: ConversationStatus | null,
   runtimeStatus: RuntimeStatus | null,
   agentState: AgentState | null,
diff --git a/frontend/src/utils/websocket-url.ts b/frontend/src/utils/websocket-url.ts
new file mode 100644
index 0000000000..fa6b907d0e
--- /dev/null
+++ b/frontend/src/utils/websocket-url.ts
@@ -0,0 +1,54 @@
+/**
+ * Extracts the base host from conversation URL
+ * @param conversationUrl The conversation URL containing host/port (e.g., "http://localhost:3000/api/conversations/123")
+ * @returns Base host (e.g., "localhost:3000") or window.location.host as fallback
+ */
+export function extractBaseHost(
+  conversationUrl: string | null | undefined,
+): string {
+  if (conversationUrl && !conversationUrl.startsWith("/")) {
+    try {
+      const url = new URL(conversationUrl);
+      return url.host; // e.g., "localhost:3000"
+    } catch {
+      return window.location.host;
+    }
+  }
+  return window.location.host;
+}
+
+/**
+ * Builds the HTTP base URL for V1 API calls
+ * @param conversationUrl The conversation URL containing host/port
+ * @returns HTTP base URL (e.g., "http://localhost:3000")
+ */
+export function buildHttpBaseUrl(
+  conversationUrl: string | null | undefined,
+): string {
+  const baseHost = extractBaseHost(conversationUrl);
+  const protocol = window.location.protocol === "https:" ? "https:" : "http:";
+  return `${protocol}//${baseHost}`;
+}
+
+/**
+ * Builds the WebSocket URL for V1 conversations (without query params)
+ * @param conversationId The conversation ID
+ * @param conversationUrl The conversation URL containing host/port (e.g., "http://localhost:3000/api/conversations/123")
+ * @returns WebSocket URL or null if inputs are invalid
+ */
+export function buildWebSocketUrl(
+  conversationId: string | undefined,
+  conversationUrl: string | null | undefined,
+): string | null {
+  if (!conversationId) {
+    return null;
+  }
+
+  const baseHost = extractBaseHost(conversationUrl);
+
+  // Build WebSocket URL: ws://host:port/sockets/events/{conversationId}
+  // Note: Query params should be passed via the useWebSocket hook options
+  const protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
+
+  return `${protocol}//${baseHost}/sockets/events/${conversationId}`;
+}