diff --git a/web/workspace/deno.json b/web/workspace/deno.json
index 2ec7064a..f382edc4 100644
--- a/web/workspace/deno.json
+++ b/web/workspace/deno.json
@@ -6,7 +6,7 @@
     "dev": "deno run -A npm:vite@7.2.7 dev",
     "dev:backend": "cd ../.. && cargo run -p yoi-workspace-server --bin yoi-server -- serve --listen 127.0.0.1:8787",
     "check": "deno run -A npm:@sveltejs/kit@2.49.4 sync && deno run -A npm:svelte-check@4.3.4 --tsconfig ./tsconfig.json",
-    "test": "deno test --allow-read=src --allow-env=VSCODE_TEXTMATE_DEBUG src/lib/workspace/auth/model.test.ts src/lib/workspace/api/http.test.ts src/lib/workspace/header/breadcrumb-model.test.ts src/lib/workspace/console/chat-submit.test.ts src/lib/workspace/console/composer-command.test.ts src/lib/workspace/console/composer-completion.test.ts src/lib/workspace/console/markdown.test.ts src/lib/workspace/console/model.test.ts src/lib/workspace/console/worker-console.ui.test.ts src/lib/workspace/settings/model.test.ts src/lib/workspace/sidebar/workers.test.ts src/lib/workspace/sidebar/worker-launch.test.ts src/lib/workspace/sidebar/repository-nav.test.ts",
+    "test": "deno test --allow-read=src --allow-env=VSCODE_TEXTMATE_DEBUG src/lib/workspace/auth/model.test.ts src/lib/workspace/api/http.test.ts src/lib/workspace/header/breadcrumb-model.test.ts src/lib/workspace/console/chat-submit.test.ts src/lib/workspace/console/composer-command.test.ts src/lib/workspace/console/composer-completion.test.ts src/lib/workspace/console/markdown.test.ts src/lib/workspace/console/model.test.ts src/lib/workspace/console/worker-console.ui.test.ts src/lib/workspace/settings/model.test.ts src/lib/workspace/sidebar/workers.test.ts src/lib/workspace/sidebar/worker-subscription.test.ts src/lib/workspace/sidebar/worker-launch.test.ts src/lib/workspace/sidebar/repository-nav.test.ts",
     "build": "deno run -A npm:vite@7.2.7 build",
     "preview": "deno run -A npm:vite@7.2.7 preview"
   },
diff --git a/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts b/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
index 34fe0f72..9ad47a8c 100644
--- a/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
+++ b/web/workspace/src/lib/workspace/console/worker-console.ui.test.ts
@@ -310,7 +310,8 @@ Deno.test("Worker Console uses protocol observation events without transcript fe
   assert(
     consolePage.includes("connectProtocolTransport") &&
       consolePage.includes("handleIncomingProtocolEvent") &&
-      consolePage.includes("/protocol/ws") &&
+      consolePage.includes("workspaceMultiplexer") &&
+      consolePage.includes('topic: "worker_protocol"') &&
       !consolePage.includes("seenObservationEventIds") &&
       consolePage.includes("createConsoleProjector") &&
       consolePage.includes("consoleProjector.append(eventBatch)") &&
@@ -541,7 +542,8 @@ Deno.test("Worker Console page is routed by runtime_id and worker_id through bac
   );
   assert(
     !consolePage.includes("/transcript") &&
-      consolePage.includes("/protocol/ws") &&
+      consolePage.includes("workspaceMultiplexer") &&
+      consolePage.includes("sendWorkerMethod") &&
       !consolePage.includes("/events" + "/ws") &&
       !consolePage.includes("/input") &&
       !consolePage.includes("/completions"),
@@ -708,3 +710,25 @@ Deno.test("Account UI owns browser passkey session state without workspace autho
     "Root layout should not redirect account and device-login public routes to a workspace",
   );
 });
+
+Deno.test("Workspace Worker list and Console share the multiplexed connection", async () => {
+  const consolePage = await Deno.readTextFile(
+    new URL(
+      "./../../../routes/w/[workspaceId]/runtimes/[runtimeId]/workers/[workerId]/console/+page.svelte",
+      import.meta.url,
+    ),
+  );
+  const sidebarStore = await Deno.readTextFile(
+    new URL("./../sidebar/worker-subscription.ts", import.meta.url),
+  );
+  const multiplexer = await Deno.readTextFile(
+    new URL("./../multiplexer.ts", import.meta.url),
+  );
+  assert(
+    consolePage.includes("workspaceMultiplexer(workspaceId)") &&
+      sidebarStore.includes("workspaceMultiplexer(workspaceId)") &&
+      multiplexer.includes("const multiplexers = new Map") &&
+      multiplexer.includes("frame: 'worker_protocol'"),
+    "Sidebar and Console should share one Workspace multiplexer and route Worker methods through a subscription lane",
+  );
+});
diff --git a/web/workspace/src/lib/workspace/multiplexer.ts b/web/workspace/src/lib/workspace/multiplexer.ts
new file mode 100644
index 00000000..a748476f
--- /dev/null
+++ b/web/workspace/src/lib/workspace/multiplexer.ts
@@ -0,0 +1,214 @@
+import { browser } from '$app/environment';
+import type {
+  EventSubscriptionSelector,
+  Method,
+  SubscriptionFrame,
+  SubscriptionId,
+} from '$lib/generated/protocol';
+import { workspaceApiPath } from '$lib/workspace/api/http';
+
+type Listener = {
+  onFrame(frame: SubscriptionFrame): void;
+  onStatus?(status: 'connecting' | 'open' | 'closed', message?: string): void;
+};
+
+type ActiveSubscription = {
+  clientId: string;
+  selector: EventSubscriptionSelector;
+  listener: Listener;
+  requestId: string | null;
+  subscriptionId: SubscriptionId | null;
+};
+
+export type WorkspaceMultiplexerSubscription = {
+  close(): void;
+  sendWorkerMethod(method: Method): void;
+};
+
+const multiplexers = new Map<string, WorkspaceMultiplexer>();
+
+export function workspaceMultiplexer(workspaceId: string): WorkspaceMultiplexer {
+  let multiplexer = multiplexers.get(workspaceId);
+  if (!multiplexer) {
+    multiplexer = new WorkspaceMultiplexer(workspaceId);
+    multiplexers.set(workspaceId, multiplexer);
+  }
+  return multiplexer;
+}
+
+export class WorkspaceMultiplexer {
+  readonly #workspaceId: string;
+  readonly #subscriptions = new Map<string, ActiveSubscription>();
+  readonly #requests = new Map<string, string>();
+  readonly #runtimeSubscriptions = new Map<string, string>();
+  #socket: WebSocket | null = null;
+  #reconnectTimer: ReturnType<typeof setTimeout> | null = null;
+  #closed = false;
+
+  constructor(workspaceId: string) {
+    this.#workspaceId = workspaceId;
+  }
+
+  subscribe(
+    selector: EventSubscriptionSelector,
+    listener: Listener,
+  ): WorkspaceMultiplexerSubscription {
+    const clientId = crypto.randomUUID();
+    this.#subscriptions.set(clientId, {
+      clientId,
+      selector,
+      listener,
+      requestId: null,
+      subscriptionId: null,
+    });
+    this.#closed = false;
+    this.#ensureConnected();
+    return {
+      close: () => this.#remove(clientId),
+      sendWorkerMethod: (method) => this.#sendWorkerMethod(clientId, method),
+    };
+  }
+
+  #ensureConnected(): void {
+    if (!browser || this.#socket || this.#closed || this.#subscriptions.size === 0) return;
+    for (const subscription of this.#subscriptions.values()) {
+      subscription.listener.onStatus?.('connecting');
+    }
+    const url = new URL(
+      workspaceApiPath(this.#workspaceId, '/protocol/ws'),
+      window.location.origin,
+    );
+    url.protocol = url.protocol === 'https:' ? 'wss:' : 'ws:';
+    const socket = new WebSocket(url);
+    this.#socket = socket;
+    socket.addEventListener('open', () => {
+      for (const subscription of this.#subscriptions.values()) {
+        subscription.listener.onStatus?.('open');
+        this.#sendSubscribe(subscription);
+      }
+    });
+    socket.addEventListener('message', (event) => this.#receive(String(event.data)));
+    socket.addEventListener('error', () => socket.close());
+    socket.addEventListener('close', () => {
+      if (this.#socket !== socket) return;
+      this.#socket = null;
+      this.#requests.clear();
+      this.#runtimeSubscriptions.clear();
+      for (const subscription of this.#subscriptions.values()) {
+        subscription.requestId = null;
+        subscription.subscriptionId = null;
+        subscription.listener.onStatus?.('closed', 'Workspace subscription disconnected');
+      }
+      if (!this.#closed && this.#subscriptions.size > 0) {
+        this.#reconnectTimer = setTimeout(() => this.#ensureConnected(), 500);
+      }
+    });
+  }
+
+  #sendSubscribe(subscription: ActiveSubscription): void {
+    const requestId = crypto.randomUUID();
+    subscription.requestId = requestId;
+    this.#requests.set(requestId, subscription.clientId);
+    this.#send({
+      protocol_version: 1,
+      frame: 'request',
+      message: {
+        method: 'subscribe_events',
+        params: { request_id: requestId, selector: subscription.selector },
+      },
+    });
+  }
+
+  #receive(text: string): void {
+    let frame: SubscriptionFrame;
+    try {
+      frame = JSON.parse(text) as SubscriptionFrame;
+    } catch {
+      this.#socket?.close();
+      return;
+    }
+    if (frame.protocol_version !== 1) {
+      this.#socket?.close();
+      return;
+    }
+    if (frame.frame === 'response' && frame.message.result === 'subscribed') {
+      const clientId = this.#requests.get(frame.message.payload.request_id);
+      const subscription = clientId ? this.#subscriptions.get(clientId) : undefined;
+      if (!clientId || !subscription) return;
+      this.#requests.delete(frame.message.payload.request_id);
+      const subscriptionId = frame.message.payload.subscription_id;
+      if (!subscriptionId) return;
+      subscription.subscriptionId = subscriptionId;
+      this.#runtimeSubscriptions.set(subscriptionId, clientId);
+      subscription.listener.onFrame(frame);
+      return;
+    }
+    if (frame.frame === 'response' && frame.message.result === 'subscription_rejected') {
+      const clientId = this.#requests.get(frame.message.payload.request_id);
+      const subscription = clientId ? this.#subscriptions.get(clientId) : undefined;
+      subscription?.listener.onFrame(frame);
+      if (clientId) {
+        this.#requests.delete(frame.message.payload.request_id);
+        this.#remove(clientId);
+      }
+      return;
+    }
+    if (frame.frame === 'event') {
+      const clientId = this.#runtimeSubscriptions.get(frame.message.data.subscription_id);
+      const subscription = clientId ? this.#subscriptions.get(clientId) : undefined;
+      subscription?.listener.onFrame(frame);
+      if (
+        frame.message.event === 'subscription_closed' &&
+        clientId &&
+        subscription &&
+        this.#socket?.readyState === WebSocket.OPEN
+      ) {
+        this.#runtimeSubscriptions.delete(frame.message.data.subscription_id);
+        subscription.subscriptionId = null;
+        subscription.listener.onStatus?.('connecting', frame.message.data.message);
+        this.#sendSubscribe(subscription);
+      }
+    }
+  }
+
+  #sendWorkerMethod(clientId: string, method: Method): void {
+    const subscription = this.#subscriptions.get(clientId);
+    if (!subscription?.subscriptionId) throw new Error('Worker protocol subscription is not open');
+    this.#send({
+      protocol_version: 1,
+      frame: 'worker_protocol',
+      message: { subscription_id: subscription.subscriptionId, method },
+    });
+  }
+
+  #remove(clientId: string): void {
+    const subscription = this.#subscriptions.get(clientId);
+    if (!subscription) return;
+    this.#subscriptions.delete(clientId);
+    if (subscription.subscriptionId && this.#socket?.readyState === WebSocket.OPEN) {
+      this.#send({
+        protocol_version: 1,
+        frame: 'request',
+        message: {
+          method: 'unsubscribe_events',
+          params: {
+            request_id: crypto.randomUUID(),
+            subscription_id: subscription.subscriptionId,
+          },
+        },
+      });
+      this.#runtimeSubscriptions.delete(subscription.subscriptionId);
+    }
+    if (this.#subscriptions.size === 0) {
+      this.#closed = true;
+      if (this.#reconnectTimer) clearTimeout(this.#reconnectTimer);
+      this.#socket?.close();
+      this.#socket = null;
+    }
+  }
+
+  #send(frame: SubscriptionFrame): void {
+    if (this.#socket?.readyState !== WebSocket.OPEN) return;
+    this.#socket.send(JSON.stringify(frame));
+  }
+}
diff --git a/web/workspace/src/lib/workspace/sidebar/worker-subscription.ts b/web/workspace/src/lib/workspace/sidebar/worker-subscription.ts
index 50c39a8d..ab55dc38 100644
--- a/web/workspace/src/lib/workspace/sidebar/worker-subscription.ts
+++ b/web/workspace/src/lib/workspace/sidebar/worker-subscription.ts
@@ -1,7 +1,6 @@
-import { browser } from '$app/environment';
 import { readable, type Readable } from 'svelte/store';
-import type { SubscriptionFrame, SubscriptionWorker } from '$lib/generated/protocol';
-import { workspaceApiPath } from '$lib/workspace/api/http';
+import type { SubscriptionWorker } from '$lib/generated/protocol';
+import { workspaceMultiplexer } from '$lib/workspace/multiplexer';
 import {
   applyWorkspaceWorkersFrame,
   createWorkspaceWorkersProjection,
@@ -22,15 +21,11 @@ export function workspaceWorkersStore(workspaceId: string): Readable<WorkspaceWo
   const store = readable<WorkspaceWorkersState>(
     { loading: true, error: null, workers: [] },
     (set) => {
-      if (!browser || !workspaceId) {
+      if (!workspaceId) {
         set({ loading: false, error: null, workers: [] });
         return;
       }
-      let closed = false;
-      let socket: WebSocket | null = null;
-      let reconnectTimer: ReturnType<typeof setTimeout> | null = null;
       const projection = createWorkspaceWorkersProjection();
-
       const publish = (loading = false, error: string | null = null) => {
         const workers = [...projection.workers.values()]
           .map(projectWorker)
@@ -40,61 +35,33 @@ export function workspaceWorkersStore(workspaceId: string): Readable<WorkspaceWo
           );
         set({ loading, error, workers });
       };
-      const connect = () => {
-        if (closed) return;
-        const url = new URL(workspaceApiPath(workspaceId, '/protocol/ws'), window.location.origin);
-        url.protocol = url.protocol === 'https:' ? 'wss:' : 'ws:';
-        socket = new WebSocket(url);
-        socket.addEventListener('open', () => {
-          const frame: SubscriptionFrame = {
-            protocol_version: 1,
-            frame: 'request',
-            message: {
-              method: 'subscribe_events',
-              params: {
-                request_id: crypto.randomUUID(),
-                selector: { topic: 'workspace_workers' },
-              },
-            },
-          };
-          socket?.send(JSON.stringify(frame));
-        });
-        socket.addEventListener('message', (message) => {
-          try {
-            const frame = JSON.parse(String(message.data)) as SubscriptionFrame;
-            let closedMessage: string | null = null;
-            if (frame.frame === 'event' && frame.message.event === 'subscription_closed') {
-              closedMessage = frame.message.data.message;
-            } else if (
-              frame.frame === 'response' &&
-              frame.message.result === 'subscription_rejected'
-            ) {
-              closedMessage = frame.message.payload.message;
+      const subscription = workspaceMultiplexer(workspaceId).subscribe(
+        { topic: 'workspace_workers' },
+        {
+          onFrame: (frame) => {
+            try {
+              if (frame.frame === 'event' && frame.message.event === 'subscription_closed') {
+                throw new Error(frame.message.data.message);
+              }
+              if (
+                frame.frame === 'response' &&
+                frame.message.result === 'subscription_rejected'
+              ) {
+                throw new Error(frame.message.payload.message);
+              }
+              applyWorkspaceWorkersFrame(projection, frame);
+              publish(false, null);
+            } catch (error) {
+              publish(false, error instanceof Error ? error.message : 'invalid Worker subscription frame');
             }
-            if (closedMessage) {
-              socket?.close();
-              throw new Error(closedMessage);
-            }
-            applyWorkspaceWorkersFrame(projection, frame);
-            publish(false, null);
-          } catch (error) {
-            publish(false, error instanceof Error ? error.message : 'invalid Worker subscription frame');
-          }
-        });
-        socket.addEventListener('close', () => {
-          socket = null;
-          if (closed) return;
-          publish(projection.workers.size === 0, 'Worker subscription disconnected; reconnecting…');
-          reconnectTimer = setTimeout(connect, 500);
-        });
-        socket.addEventListener('error', () => socket?.close());
-      };
-      connect();
-      return () => {
-        closed = true;
-        if (reconnectTimer) clearTimeout(reconnectTimer);
-        socket?.close();
-      };
+          },
+          onStatus: (status, message) => {
+            if (status === 'connecting') publish(projection.workers.size === 0, null);
+            if (status === 'closed') publish(projection.workers.size === 0, message ?? null);
+          },
+        },
+      );
+      return () => subscription.close();
     },
   );
   stores.set(workspaceId, store);
diff --git a/web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workers/[workerId]/console/+page.svelte b/web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workers/[workerId]/console/+page.svelte
index 8980da8b..dcd21196 100644
--- a/web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workers/[workerId]/console/+page.svelte
+++ b/web/workspace/src/routes/w/[workspaceId]/runtimes/[runtimeId]/workers/[workerId]/console/+page.svelte
@@ -24,6 +24,7 @@
     } from "$lib/workspace/console/model";
     import type { Event as ProtocolEvent, Method as ProtocolMethod, RewindTarget, Segment } from "$lib/generated/protocol";
     import { workspaceApiPath } from "$lib/workspace/api/http";
+    import { workspaceMultiplexer, type WorkspaceMultiplexerSubscription } from "$lib/workspace/multiplexer";
     import type {
         Diagnostic,
         Worker,
@@ -105,7 +106,7 @@
     let protocolState = $state<"connecting" | "open" | "closed" | "error">(
         "connecting",
     );
-    let protocolSocket: WebSocket | null = null;
+    let protocolSubscription: WorkspaceMultiplexerSubscription | null = null;
     let pendingCompletionRequest: {
         resolve: (entries: ComposerCompletionEntry[]) => void;
         reject: (error: Error) => void;
@@ -514,80 +515,76 @@
             return;
         }
         protocolState = "connecting";
-        const protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
-        const wsPath = workerApiPath(
-            `/runtimes/${encodeURIComponent(target.runtimeId)}/workers/${encodeURIComponent(
-                target.workerId,
-            )}/protocol/ws`,
+        const subscription = workspaceMultiplexer(workspaceId).subscribe(
+            {
+                topic: "worker_protocol",
+                worker_id: target.workerId,
+                runtime_id: target.runtimeId,
+            },
+            {
+                onFrame: (frame) => {
+                    if (token !== reloadToken) return;
+                    try {
+                        if (
+                            frame.frame === "response" &&
+                            frame.message.result === "subscribed" &&
+                            frame.message.payload.snapshot.topic === "worker_protocol"
+                        ) {
+                            for (const event of frame.message.payload.snapshot.data.events) {
+                                handleIncomingProtocolEvent(event);
+                            }
+                            protocolState = "open";
+                        } else if (
+                            frame.frame === "event" &&
+                            frame.message.event === "event" &&
+                            frame.message.data.payload.event === "worker_protocol"
+                        ) {
+                            handleIncomingProtocolEvent(frame.message.data.payload.data.event);
+                        } else if (
+                            frame.frame === "event" &&
+                            frame.message.event === "subscription_closed"
+                        ) {
+                            protocolState = "closed";
+                            rejectPendingCompletion(new Error(frame.message.data.message));
+                        } else if (
+                            frame.frame === "response" &&
+                            frame.message.result === "subscription_rejected"
+                        ) {
+                            protocolState = "error";
+                            throw new Error(frame.message.payload.message);
+                        }
+                    } catch (error) {
+                        streamDiagnostics = [
+                            ...streamDiagnostics,
+                            {
+                                code: "worker_protocol_frame_invalid",
+                                severity: "warning",
+                                message: error instanceof Error ? error.message : String(error),
+                            },
+                        ];
+                    }
+                },
+                onStatus: (status) => {
+                    if (token !== reloadToken) return;
+                    protocolState = status === "open" ? "connecting" : status;
+                    if (status === "closed") {
+                        rejectPendingCompletion(new Error("Worker protocol WebSocket closed."));
+                    }
+                },
+            },
         );
-        const ws = new WebSocket(
-            `${protocol}//${window.location.host}${wsPath}`,
-        );
-        protocolSocket = ws;
-
-        ws.onopen = () => {
-            if (token === reloadToken) {
-                protocolState = "open";
-            }
-        };
-        ws.onmessage = (message) => {
-            if (token !== reloadToken) {
-                return;
-            }
-            try {
-                handleIncomingProtocolEvent(
-                    JSON.parse(String(message.data)) as ProtocolEvent,
-                );
-            } catch (error) {
-                streamDiagnostics = [
-                    ...streamDiagnostics,
-                    {
-                        code: "worker_protocol_frame_invalid",
-                        severity: "warning",
-                        message:
-                            error instanceof Error ? error.message : String(error),
-                    },
-                ];
-            }
-        };
-        ws.onerror = () => {
-            if (token === reloadToken) {
-                protocolState = "error";
-                streamDiagnostics = [
-                    ...streamDiagnostics,
-                    {
-                        code: "worker_protocol_ws_error",
-                        severity: "error",
-                        message: "Worker protocol WebSocket failed.",
-                    },
-                ];
-            }
-        };
-        ws.onclose = () => {
-            if (protocolSocket === ws) {
-                protocolSocket = null;
-            }
-            if (token === reloadToken && protocolState !== "error") {
-                protocolState = "closed";
-            }
-            rejectPendingCompletion(
-                new Error("Worker protocol WebSocket closed."),
-            );
-        };
-
+        protocolSubscription = subscription;
         return () => {
-            if (protocolSocket === ws) {
-                protocolSocket = null;
-            }
-            ws.close();
+            if (protocolSubscription === subscription) protocolSubscription = null;
+            subscription.close();
         };
     }
 
     function sendProtocolMethod(method: ProtocolMethod) {
-        if (!protocolSocket || protocolSocket.readyState !== WebSocket.OPEN) {
+        if (!protocolSubscription || protocolState !== "open") {
             throw new Error("Worker protocol WebSocket is not open.");
         }
-        protocolSocket.send(JSON.stringify(method));
+        protocolSubscription.sendWorkerMethod(method);
     }
 
     function handleProtocolCommandEvent(event: ProtocolEvent) {